• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A SIGNAL OF A COLOR SIGNAL FOR A TELEVISION RECEIVER, containing the first non-inverting amplifier, with a chain connected to the series of which is connected in series with a tunable capacitive element of the quartz resonator, a resistor and a capacitor, a template, and a template, and a template, a template, and a template, a template, and a template, a template, a template, a template, and a template, a template, a template, and a template, a template, and a template, a template, a template, a Template, a template, a quartz resonator, a capacitor, a capacitor, a resistor and a capacitor. connected to the junction point of a constant capacitor capacitor and a reaistor A., a source of bias, two current generators, a second non-inverting feed amplifier torus control bpsYas consisting of six-tranzis Gorov, the emitters of the second transistors and tretegs control unit are combined and connected to the output of the first oscillator: a current emitter. the first transistor of the control unit is connected to the collector of the second one. the transistor, the base of which is connected to the emitter of the transistor of the second non-inverting amplifier, the base of the transistor of the first non-inverting amplifier is connected to a feedback resistor, characterized in that, in order to extend the range of the color subcarrier phase adjustment, the second output of the feedback resistor is connected to the source bus power, the emitter of the first transistor of the amplifier is connected to the base of the second transistor of the amplifier, the collectors of the first and second transistors of the amplifier are combined and connected to the pin The power supply source and the emitters of the second and third transistors of the amplifier are combined (Led and connected to the second current generator, the bases of the third transistors of the amplifier and the control unit are combined and connected to the bias source, the collector of the third transistor of the amplifier is connected to the input of the first non-inverter amplifier, the base of the first the transistor of the usi 4l through an additional phase; the rotator is connected to the base of the transistor of the second non-inverting amplifiers; the collector of the third transistor & The emitters of the fourth and fifth transistors of the control unit, the bases of which are connected to the first and second control drives, respectively, are: the lecturers of the fourth and first transistors of the reference unit are combined and connected to the input of the first non-inverting amplifier, to the e1Tter of the first transistor of the control unit emitter the sixth. Transistor control unit, base
    公开号:SU1145943A3
    申请号:SU762418860
    申请日:1976-11-12
    公开日:1985-03-15
    发明作者:Альберт Харвуд Леопольд
    申请人:Рка Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    the first and sixth transistors to the block inputs, the collectors of the fifth and sixth control are connected to the corresponding transistors of the control unit to the second, and the first control is connected to the power supply bus.
    1145943
    . . . The invention relates to radio engineering, in particular, voltage controlled oscillators used in the color channels of color television receivers to provide baseline signals for demodulating the color signals received. A device is known that contains a key signal generator, an amplifier, a carrier generator, a key circuit, a color burst control signal, detectors, demodulators, a bandpass filter, a phase-shifting chain, a delay line, a clock selector circuit, a horizontal sweep Cl The disadvantage of the known signal generator applied in a color television receiver, is the presence of frequency and phase distortions of the generated signals when it is rearranged. Closest to the present invention is a device containing a first un-inverting amplifier, to the output of which is connected: a chain consisting of a tunable capacitive element connected in series, a quartz resonator, a resistor and a capacitor of a constant capacity, an amplifier consisting of a three transistor, the base of one of which is connected to the junction point; capacitor of a constant capacitance and a resistor; bias source, two reHepiaTopa currents, the second non-inverting amplifier at the transistor, control unit, consisting The first of six transistors, the emitters of the second and third transistors of the control unit are combined and connected to the output of the first current generator, the emitter of the first transistor of the control unit is connected to the collector of the second transistor, the base of which is connected to the transistor of the second non-inverting amplifier, the base of the first transistor non-inverting amplifier is connected to the feedback resistor, to the input of the second: non-inverting amplifier is connected to the input source and phase shifter, whose code through the emitter the repeater is connected to the base of the third transistor, the control signal source is connected to the base of the emitter follower transistor, the bias source is connected to the base of the transistor of the first Current generator and to the bias circuits of the amplifier transistors, the output of which is the output of the C2 device. A disadvantage of the known signal generator is the small range of the signal phase adjustment. The purpose of the invention is to expand the range of adjustment of the phase of the color subcarrier. The goal is achieved by the fact that in the signal generator the color subcarrier for a television is. This receiver contains the first non-inverting amplifier, the output of which is connected to a chain: consisting of a tunable capacitive element connected in series, a quartz resonator, a resistor and a constant capacitor, an amplifier consisting of three transistors, the base of one. of which. connected to more precisely connect. Constant capacitor capacitor and resistor, bias source, two current generators, the second non-inverting amplifier at the transistor, a control unit consisting of six transistors, the emitters of the second and third transistors of the control unit are combined and connected to the output of the first current generator, the emitter of the first transistor. the control unit is connected to the collector of the second transistor, the base of which is connected ... 1.
    with the emitter of the transistor of the second non-inverting amplifier, the base of the transistor of the first non-inverting amplifier is connected to the feedback resistor, the second output of the resistor of the feedback circuit is connected to the DMHe power supply, the emitter of the first transistor of the amplifier is connected to the base of the second transistor of the amplifier, the collectors of the first and second transistors of the amplifier combined and connected to the power supply input, and the emitters of the second and third transistors of the amplifier are combined and connected to the second current generator, the base t Amplifier transistors and a control unit are combined and connected to a source bias collector third
    the transistor of the amplifier is connected to the input of the first non-inverting amplifier, the base of the first transistor of the amplifier is through an additional. Phase rotator. Connected to the base of the transistor of the second non-inverting amplifier, the collector of the third transistor of the control unit is connected to the emitters of the fourth and fifth control unit resistances, the bases of which are connected to the first and second control inputs, respectively, the collectors of the fourth and first controllers of the control unit are combined and connected to the input of the first non-inverting amplifier, the emitter of the sixth transistor of the control unit, the base of the first and above is connected to the emitter of the first transistor of the control unit The hundred transistors of the control unit are connected respectively to the second and first control inputs. The collectors of the fifth and sixth transistors of the control unit are connected to the power supply bus.
    The drawing shows the principal electrical signal generator.
    The color below signal generator: a TV receiver is equipped with a phase adjustment block 1, the amplifier of the auto-oscillator 2, a quartz Ailter 3 and a phase shifting 1st element 4. The phase adjustment block 1 contains two differential amplifiers on transistors 5, 6 and 7, 8, respectively, an additional differential amplifier on transis
    459434
    tori 9 and 10, a current stabilizer, made on transistor 11, in the emitter of which resistor 12 is turned on, and the base of which is connected to 5 bias source. The collector of the transistor 1 1 is connected to the combined emitters of the transistors 9 and 10, the collectors of which are connected respectively to the combined emitt.
    10 transistors 5 and 6 and the combined emitters of transistors 7 and 8. The control input of phase adjustment unit 1 is connected to control signal lines 13, the bases of transistors 5, 7 and 6, 8 respectively being combined and connected to first and second buses 13, respectively. control signals.
    Amplifier autogenerator 2. contains transistors 14 and 15, emitters
    which are connected and connected via a current generator to a common bus. The current generator is made of transistor 16, the collector of which is connected to
    5 emitters of transistors 14 and 15, the base - to the source of displacement 1L1, and the emitter through a resistor to the common bus. In the bias of transistors .14 and 15 inclusive. | us respectively transistors 17 and
    0 18, the bases of which are connected to displacement sources.
    The collector of the transistor 17 is connected to the base of the transistor 14, to the base of the transistor 10 and to the emitters
    dvuhmimtternogo transistor 19,
    whose collector is connected to the collector of transistor 15 and the collector of transistor 20. The collector of transistor 18 is connected to the base of transistor 15, the emitter of transistor 20 and the output of the device. The collector of the transistor 14 is connected to the base of the transistor 21 and to the collectors of transistors 5 and 8. Emitters of transistors
    5 17, 16 and 18 are connected respectively via resistors 22, 23 and 24 with a common bus. The bases of transistors 19 and 20, respectively, through resistors 25 and 26 are connected to an additional source. Displacement stresses. The collectors of Transistors 15 and 21 are connected to the power line directly, and the collector of transistor 14 is connected to the power line through a resistor 27.
    5 The emitter of the transistor 21 is connected to the common bus through a resistor 28 and through the elements of the quartz filter 3J connected in series
    a capacitor 29, a crystal resonator 30, a resistor 31 and a capacitor 32, the combined leads of the resistor 31 and the capacitor 32 are connected to the base of the transistor 20 and to the input of a phase-shifting element 4 containing an inductor coil 33 connected between the input of the phase-shifting element 4 and its output between the output of the phase-shifting element 4 and the common shea parallel circuit containing the capacitor 34 in one branch and the other capacitor 35 connected in series and the resistor 36. The output of the phase-shifting element 4 is connected to the base a transistor 37, the collector of which is connected to the power bus, and the emitter is to the base of the transistor 9 of the phase control unit 1.
    The color subcarrier signal generator works as follows.
    Regenerative feedback on alternating current in the amplifier of the auto-oscillator 2, is necessary for. maintaining the oscillations, is carried out using a feedback loop including an emitter follower, which is produced on a transistor 21, a quartz filter 3 containing a variable capacitor 29, a quartz resonator 30 and a resistor 31; The load of the quartz filter is a capacitor 32. The signal formed on the capacitor 32 is fed to the input of an emitter follower made on transistors 20 and 15. The emitters of transistors 15 and 14 are combined, therefore the signal received on the emitter load of transistor 15 is in the summer. with amplifier input,
    performed on transistor 14. Thus, the transistor 14 is connected according to the common base circuit. The output signal of the amplifier is formed on the resistor 27 connected to the collector circuit of transistor 14, the collector of transistor 14 and the base of transistor 21 being connected. Thus, the feedback circuit of these the cascades are closed. In addition, an additional circuit is formed in the generator, the input voltage of which is the voltage formed on the coadjator 32. The indicated signal goes to the phase-shifting element 4, and from its output to the input
    phase adjustment unit 1. The phase shifting element 4; is made so that it has a relatively low quality factor and 5J 1, as well as a phase shift; approximately 90 relative to the signal from the amplifier of the oscillator 2.
    Thus, the quadrature oscillating signal arrives at the base of transistor 37, which is matching, and is turned on at the input of a differential amplifier made on transistors 9 and 10. At the output of phase adjustment unit 1 by adjusting the conductivity of transistors 5-8 Mirror-phased signals are formed on the signals 13.
    As long as the frequency and phase characteristics of the incoming quartz filter 3 and the received flash signal are in the required ratios (i.e., have the same frequency and the offset between them is 90), control signals are equal to the bus 13. Consequently, each of transistors .5 and 8 transmit equal, but oppositely directed signals corresponding to quadrature signals received from transistors 9 and 10, and these signals are mutually destroyed when added to resistor 27. Therefore, when the output signal of the autogenerator amplifier 2 has a corresponding phase and frequency in relation to the flash signal, the phase adjustment unit 1 does not have any effect on the output signal. If the ratios between the characteristics of the output signal and the flash signal begin to change, the bus 13 receives a control signal which differs from one another in magnitude. The transistors 5 and 8 in this case pass unequal to it the magnitude of the quadrature current signals, which leads to the fact that the resulting quadrature signal on the resistor 27 has / a certain amount and polarity corresponding to. a common ratio of signal levels on 1: 3 tires. Adjustment symmetry is provided with the help of a balanced operation mode of the phase adjustment unit 1. While the phase adjustment unit 1 is at rest, the current supplied by the current stabilizer made at transistor 11 is distributed evenly between the transistors 9 and 10 that receive the same offset. At rest, the rest current to the buses 13 (i.e., in the absence of an error signal), the collector currents of transistors 9 and 10 are distributed mostly evenly in differential amplifiers to a trans. Sisters 5, 6 and 7, 8. The collector current transistors 5 and 8 are folded on the load resistor 27, which forms a load rest current which is half the current passing through the stabilized TOJP current on the transistor 11. As a result of using the proposed the generator can be counted on the required symmetry of the setup in the range up to 90 (i.e. ± 45) when the combined signal passes through a resistor 27. The said combined signal is fed from transistor 21 to a quartz filter 3. The change in the operating frequency is nktsiey bandpass filter 3, and the shift amount; the phases are determined by the combined signal output from the resistor 27. Consequently, the change in frequency (l {) of the autogenerator 2 can be mathematically determined from the expression 2% I. where B is the bandwidth of the quartz filter 3 b - the phase angle of the combined signal extracted by the resistor 27. The operating cleanliness of the generator remains unchanged provided that the frequency of the generator signal and the frequency of the flash signal are almost equal to each other. Positive or AZ8. negative frequency deviations produce corresponding positive or negative values of the quadrature signal generated at the output of the phase control unit 1 to create a result signal with a phase angle determining the frequency deviation when adding the quadrature signal and the signal generated in the regenerative circuit of the auto-oscillator 2 amplifier on the resistor 27. The operating frequency of the generated signal varies according to the indicated formula depending on the frequency of the signal from the flasher, with this being with the condition of equality to zero of the phase shift on the feedback feedback amplifier of the oscillator 2, which is necessary to maintain the oscillations. The resistor 31 is selected such that it can provide the necessary band of a quartz filter 3 ,. spread out symmetrically with respect to the nominal frequency of the generator. Resistor 31 in combination with capacitor 32 contributes to attenuating the higher order harmonics that MorjT occurs due to the presence of the parasitic static capacitance of the quartz resonator 30. Such a circuit also eliminates the possibility of parasitic oscillations in the generator almost without degrading the gain in the reverse loop, connection auto generator 2.. Along with ensuring a predetermined symmetric frequency tuning range, the proposed color subcarrier signal generator for a television receiver generates the reference in-phase and quadrature phase signals necessary for demodulating the subcarrier of differential color signals. In this case, the reference signals are produced, respectively, by the amplifier of the autogenerator and the phase-shifted element. .
    权利要求:
    Claims (1)
    [1]
    A color subcarrier signal generator for a television receiver, comprising a first non-inverting amplifier, the output of which is connected to a circuit consisting of a series-connected tunable capacitive element, a quartz resonator, a resistor and a constant capacitor, an amplifier consisting of three transistors, the base of one of which is connected to the connection point of a constant capacitor and a resistor., a bias source, two current generators, a second non-inverting amplifier on a transistor, a block control, consisting of six transistors, emitters of the second and third transistors of the control unit are combined and connected to the output of the first generator; current, the emitter of the first transistor of the control unit is connected to the collector of the second .. transistor, the base of which is connected to the emitter of the transistor of the second non-inverting amplifier, the base of the transistor of the first non-inverting amplifier is connected to a feedback resistor, characterized in that, in order to expand the adjustment range color subcarrier phase, the second output of the feedback resistor is connected to the power supply bus, the emitter of the first amplifier transistor is connected to the base of the second amplifier transistor, collect The ohms of the first and second amplifier transistors are combined and connected to the power supply bus, and the emitters of the second and third amplifier transistors are combined and connected to the second current generator, the bases of the third amplifier transistors and the control unit are combined and connected to the bias source, the collector of the third amplifier transistor connected to the input of the first non-inverting amplifier • the base of the first transistor of the amplifier through an additional phase shifter is connected to the base of the transistor of the second non-inverting amplifying body I, the collector of the third transistor of the control unit is connected to the emitters of the fourth and fifth transistors of the control unit, the bases of which are respectively connected to the first and second control inputs, the collectors of the fourth and first transistors of the control unit are combined and connected to the input of the first non-inverting amplifier, to the emitter of the first transistor of the block control connected emitter of the sixth. base transistor
    SU.,. 1145943 of the first and sixth transistors to the wide inputs, the fifth collectors and the control bus are connected to the second transistors of the control unit to the second, and the first is connected to the power supply bus.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
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