• 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 gain-controlled amplifier is provided in which emitter degeneration is varied without affecting the D.C. biasing of the amplifier. An amplifying transistor is resistively coupled in a common emitter amplifier configuration with a fixed collector load resistor. The emitter impedance of the amplifying transistor includes a controlled resistance device having a base electrode coupled to the emitter electrode of the amplifying transistor, an emitter electrode coupled to receive a variable gain controlling current and a collector electrode coupled to a point of reference potential. At signal frequencies, the base-to-emitter junction of the device acts as a resistance which varies inversely with the flow of gain controlling current through the collector-to-emitter path of the device. Varying the resistance of the base-to-emitter junction of the device varies the emitter impedance and the degeneration of the amplifying transistor, which varies the gain of the amplifier. The collector-to-emitter path of the device is separate from the transistor biasing circuitry, and hence modulation of the device will not affect the D.C. biasing of the amplifying transistor. Under strong signal (maximum gain reduction) conditions, the controlled resistance device is turned off completely so that it will not introduce intermodulation distortion into the amplifier. The fixed collector load resistor provides a constant, high output impedance, which reduces power dissipation and signal currents flowing in the amplifier power supply.
    公开号:SU1268118A3
    申请号:SU813272953
    申请日:1981-04-22
    公开日:1986-10-30
    发明作者:Рудольф Харфорд Джек
    申请人:Рка Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to a transistor amplifier, in particular to a transistor amplifier with an adjustable gain factor, in which the negative emitter feedback is changed without changing the DC bias voltage.
    The purpose of the invention is to expand the frequency range. FIG. 1 shows the principle of this electrical amplifier circuit with adjustable gain; Fig. 2 illustrates an example of the use of the invention in a differential amplifier circuit. The adjustable gain amplifier contains an amplifier transistor 1, a resistor 2 in the emitter circuit of the amplifier transistor, a control transistor 3, and a control current source 4. The differential amplifier also contains additional amplifying 5 and 6 regulating transistors, additional resistors 7 and 8. The proposed amplifier with adjustable gain factor works following 1; them way. The yci shadow factor of the amplifier with adjustable gain is adjusted by changing the impedance in the emitter circuit of the amplifier transistor 1 by changing the impedance of the regulating transistor 3 by means of an I31h - dissipating the current flowing through the neghe, while the greater the current flowing through the regulating transistor 3, the lower the impedance of its transition tank - emitter,. As a regulating transistor 3, both common transistors and vertical pnp transistors can be used, in which the regions are regions of the super-purified (high conductivity) semiconductor material. These pure regions are divided into a P + emitter region and a n + contact base region by a distance that is longer than the diffusion length of minority carriers injected into the pure region from the emitter region in response to the emitter-collector junction current 1 (regulating the gain, thus emitter junction - the base of the device acts as a non-detecting PIN diode for high frequency signals (i.e., more than 1 MHz). The junction emitter resistance of the regulating transistor 3 base is controlled by the current IGC received from The control current 4 and decreases with increasing current. Most likely, the current Igj flows through the emitter-collector junction of devices with extremely small direct current flowing into the base of the device, the base current is insignificant when compared to the emitter current of the amplifying transistor 1 and, therefore, does not violate the bias over the poston current of the amplifying transistor that allows you to connect the regulating transistor 3 directly to the emitter of the amplifying transistor 1 without separating condensate, which leads to the frequency range broadening in the region of high frequencies. In a differential amplifier, an increase in the current of the source 4 of the control current leads to a decrease in the base-emitter junction resistances of the regulating and additional regulating transistors 3 and 6, these decreasing resistors will be parallel to the additional resistors 7 and 8, hence the impedances in the amplifying emitters and the additional amplifier transistors 1 and 5 will be small and the gain of the differential amplifier will be maximum. The maximum gain factor of the differential usi. A power is achieved at the lowest current of the control current source 4 and the emitter resistances of the amplifying and additional amplifying transistors 1 and 6 will be equal to the additional resistors 7 and 8. The proposed device can be used as modulators, in which the modulating signal is the current of the control current source 4, of the invention. An adjustable gain amplifier comprising an amplifying transistor connected in a common emitter circuit with a resistor in the emitter circuit, as well as a resistor. a guiding transistor and a control signal source, characterized in that, in order to extend the frequency
    frequency range, the source control emitter of the amplifying transistor,
    signal is made in the form of a source-collector connected to a common bus ,,
    Control current nickname, regulator base. The emitter is connected to the source of the gate transistor. The control current is connected.
    AT
    Fi8.2
    权利要求:
    Claims (1)
    [1]
    F r m> l a invention
    An adjustable gain amplifier comprising an amplifying transistor connected in a circuit with a common emitter with a resistor in the emitter circuit, and also a regulating transistor and a control signal source, characterized in that, in order to expand the frequency range 12681 18, the control signal source is made in as a source of control current, the base of the control transistor is connected to an emitter of an amplifying transistor, the collector is connected to a common bus, and the emitter is connected to a source of control current,
    类似技术:
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    US3984783A|1976-10-05|Amplifier
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    同族专利:
    公开号 | 公开日
    ATA182481A|1986-10-15|
    FR2481541B1|1987-03-20|
    DK179581A|1981-10-24|
    PL135040B1|1985-09-30|
    JPS56168415A|1981-12-24|
    JPH0121643B2|1989-04-21|
    ES8206117A1|1982-06-16|
    CA1170731A|1984-07-10|
    NL190681C|1994-06-16|
    PT72855B|1982-04-02|
    NZ196874A|1985-02-28|
    AR231889A1|1985-03-29|
    NL190681B|1994-01-17|
    GB2074410B|1984-07-25|
    BE888511A|1981-08-17|
    PT72855A|1981-05-01|
    AU542842B2|1985-03-21|
    AU6963481A|1981-10-29|
    PL230736A1|1981-12-23|
    FI811188L|1981-10-24|
    DK157966C|1990-08-13|
    DK157966B|1990-03-05|
    KR850000733B1|1985-05-23|
    AT383236B|1987-06-10|
    FR2481541A1|1981-10-30|
    ES501552A0|1982-06-16|
    US4345214A|1982-08-17|
    SE448801B|1987-03-16|
    ZA812598B|1982-04-28|
    FI74367B|1987-09-30|
    IT8120925D0|1981-04-03|
    KR830005762A|1983-09-09|
    DE3116228C2|1987-05-14|
    IT1194044B|1988-08-31|
    SE8102482L|1981-10-24|
    FI74367C|1988-01-11|
    NL8101991A|1981-11-16|
    DE3116228A1|1982-03-25|
    DD158458A5|1983-01-12|
    GB2074410A|1981-10-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    RU2719419C1|2019-12-16|2020-04-17|Открытое акционерное общество "Межгосударственная Корпорация Развития" |Automatic gain control method and its implementing device|US3002090A|1958-08-27|1961-09-26|Hazeltine Research Inc|Automatic-gain-control system|
    DE1247405B|1960-06-09|1967-08-17|Telefunken Patent|Single-stage transistor amplifier that can be regulated over a wide range|
    DE1285547B|1965-04-17|1968-12-19|Te Ka De Fernmeldeapp Gmbh|Method for automatic gain control of a negative feedback transistor amplifier stage in emitter circuit|
    DE1943788A1|1969-08-28|1971-03-04|Siemens Ag|Circuit arrangement for an integrated amplifier stage with controlled negative feedback|
    US3641450A|1970-12-15|1972-02-08|Motorola Inc|Gain controlled differential amplifier circuit|
    US3700937A|1971-07-01|1972-10-24|Branson Instr|Submersible ultrasonic transducer assembly|
    FR2204333A5|1972-10-20|1974-05-17|Thomson Csf|
    DE2262089C3|1972-12-19|1975-10-30|Philips Patentverwaltung Gmbh, 2000 Hamburg|Circuit arrangement for electronic frequency influencing, in particular electronic sound adjuster|
    JPS5625815B2|1974-02-14|1981-06-15|
    US4131809A|1974-06-17|1978-12-26|U.S. Philips Corporation|Symmetrical arrangement for forming a variable alternating-current resistance|
    NL161318C|1974-06-17|1980-01-15|Philips Nv|SYMMETRICAL DEVICE FOR FORMING AN ADJUSTABLE AC AC RESISTANCE.|
    DE2804142C3|1978-01-31|1982-02-11|Siemens AG, 1000 Berlin und 8000 München|Circuit arrangement for compensating for leakage currents which are caused by parasitic transistors in a dynamic resistor used for gain control of integrated, broadband differential amplifiers|
    US4267518A|1979-09-13|1981-05-12|Sperry Corporation|Gain controllable amplifier stage|
    US4344043A|1980-04-23|1982-08-10|Rca Corporation|Variable load impedance gain-controlled amplifier|JPH0418459B2|1982-09-20|1992-03-27|Tokyo Shibaura Electric Co|
    EP0836766B1|1996-05-09|2001-11-14|Koninklijke Philips Electronics N.V.|Degenerated differential pair with controllable transconductance|
    JP4054716B2|2003-05-16|2008-03-05|沖電気工業株式会社|Variable gain amplifier, AM modulation signal receiving circuit, and detection circuit|
    US8611836B2|2010-08-25|2013-12-17|Skyworks Solutions, Inc.|Amplifier gain adjustment in response to reduced supply voltage|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US06/143,035|US4345214A|1980-04-23|1980-04-23|Variable emitter degeneration gain-controlled amplifier|
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