• 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:
    AMPLIFIER WITH ADJUSTABLE AMPLIFIER FACTOR, containing an amplifying transistor connected according to a common emitter circuit, to the collector of which a regulating transistor is connected, as well as a regulating current source, characterized by the fact that the base of the regulating transistor the collector of which is connected to the common bus and the source of the regulating current to the emitter of the regulating transistor. (Y) from 00
    公开号:SU1103812A3
    申请号:SU813272952
    申请日:1981-04-22
    公开日:1984-07-15
    发明作者:Рудольф Хархорд Джек
    申请人:Рка Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    The invention is related to transistor amplifier circuits, in which the gain is controlled by varying the output pulse of the amplifier. Adjustable gain amplifiers should satisfy some conflicting requirements for their performance. On one side, the amplifier should operate linearly over a wide range of input signal levels; on the other hand, the adjustment range must be wide enough in order to maintain a constant output level throughout the entire range of input signal variation. However, adjusting the gain of the MOKet will result in a violation of the linear operation of the amplifier. The closest to the technical essence of the invention is an amplifier with adjustable gain, containing an amplifying transistor connected according to a 06 emitter circuit, to the collector of which the regulating transistor is connected, as well as a source of regulating current. by using capacitive coupling ClJ. However, the use of a capacitor which is a frequency dependent element leads to a limitation on the dynamic range of the amplifier. In addition, the use of a capacitor makes it difficult to manufacture an amplifier in the form of integrated circuits. The aim of the invention is to expand the range of regulation. The goal is achieved by the fact that in an amplifier with an adjustable gain factor containing an amplifying transistor connected according to a common emitter circuit, to the collector of which a regulating transistor is connected, as well as a source of regulating current, the base of the regulating transistor whose collector connected to a common bus, and a regulating current source - to the emitter of the regulating transistor. FIG. Figure 1 shows the principal and electrical circuit of the amplifier with adjustable gain for the first case of using it as a differential amplifier} in FIG. 2 is a circuit diagram of an amplifier with adjustable gain for use as a differential amplifier with input damping {in FIG. 3 is an electrical amplifier circuit with adjustable gain for use as a cascade amplifier. The amplifier with adjustable gain (Fig. 1) contains amplifying transistors 1, regulating transistors 2, a source of control current 3, as well as emitter resistors 4 and an additional resistor 5. A differential amplifier with input damping (Fig. 2) also contains emitter followers 6 on transistors 7, an additional emitter resistor 8 and a capacitor 9. The cascade amplifier (Fig. 3) contains additional transistors 10. The amplifier with an adjustable gain factor operates as follows. A change in the load impedance in the collector circuit leads to a change in the gain of the amplifier transistor 1, which is the product of the impedance of the collector load on the slope of the amplifier transistor. At the same time, the entire regulating current flows through the collector-emitter circuit of the regulating transistor 2 and does not affect the DC mode of the amplifying transistor, since only the base current flows to the collector circuit of the amplifying transistor 1 only very small compared to the rest current. the operating point of the amplifier transistor 1 does not decrease during the adjustment process, the actual range is expanded. In addition, the proposed amplifier has an improved signal-to-noise ratio, as with strong input signals, the gain is reduced by reducing the resistance of the collector load, which reduces the resistance that generates noise at the output of the gain. This property is particularly useful for a televised intermediate frequency amplifier (IF amplifier). These advantages are provided by a differential amplifier with adjustable gain, and since the junction point of emitter resistors 4 with additional resistor 5 is actually a zero point, the input signal is distributed between the emitter dynamic resistance of the amplifier transistor 1 and the emitter resistor 4, its value can exceed 26 mV, while the proper amplifying transistor 1 can operate linearly at input signal levels of approximately 13 mV. However, when using an amplifier with an adjustable gain as an amplifier in a television receiver, feedback resulting from the presence of the collector-base capacitance of the amplifying transistor 1 may reduce the gain and change the input impedance. In an amplifier with adjustable gain (Fig. 2), the effect of this capacitance is reduced by turning on the emitter repeaters 6 at the inputs. The connection between the emitters of the amplifying transistors 1 of a circuit consisting of a pair of interconnections of an additional emitter resistor 8 and an additional capacitor makes it possible to ensure a constant potential of emitters of variable signals. In a cascade amplifier (Fig. 3), the effect of the collector-base capacitance is also reduced. In this circuit, the amplifying transistors 1 operate as current sources for the additional transistors 10, which provide voltage amplification. Since the signal levels at the collectors of the amplifying transistors 1 are constant, the effect of their collector-base capacitance is significantly reduced and, therefore, the incoming pulses are constant in the control range. The effect of the capacitor-base capacitance, additional transistors 10 is reduced due to the fact that the bases of additional transistors at the signal frequency are grounded and the signal levels at the bases and emitters are constant. The considered devices can also work as modulators. In this case, the regulating current source produces a modulating current, and the carrier signal is fed between the device inputs, thereby output. produced by a carrier modulated in amplitude by modulating current information.
    权利要求:
    Claims (1)
    [1]
    An amplifier with an adjustable gain, comprising an amplifying transistor connected in a circuit with a common emitter, to the collector of which a regulating transistor is connected, as well as a source of regulating current, characterized in that, in order to expand the regulation range, the base of the regulating transistor is connected to the collector of the amplifying transistor whose collector is connected to a common bus, and the source of the regulating current to the emitter of the regulating transistor.
    类似技术:
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    同族专利:
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    CA1183581A|1985-03-05|
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    FR2481539B1|1987-03-20|
    GB2074409A|1981-10-28|
    JPS56168414A|1981-12-24|
    ZA812597B|1982-04-28|
    FI76455B|1988-06-30|
    AR224937A1|1982-01-29|
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    PL134784B1|1985-09-30|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE4330549A1|1993-09-09|1995-03-16|Thomson Brandt Gmbh|Automatic gaincontrol loop for a radiofrequency receiver|BE625672A|1961-12-06|
    GB1036727A|1962-05-09|1966-07-20|Plessey Co Ltd|Improvements in or relating to variable-gain circuits|
    US3191070A|1963-01-21|1965-06-22|Fairchild Camera Instr Co|Transistor agg device|
    GB1178232A|1966-02-12|1970-01-21|Emi Ltd|Improvements in or relating to gain control circuits.|
    US3706937A|1970-12-03|1972-12-19|Nat Semiconductor Corp|Gain controlled amplifier for integrated circuit applications|
    US3641450A|1970-12-15|1972-02-08|Motorola Inc|Gain controlled differential amplifier circuit|
    DE2308835C3|1972-03-02|1986-03-27|Sony Corp., Tokio/Tokyo|Adjustable amplifier for electrical signals|
    JPS5315638B2|1972-12-13|1978-05-26|
    JPS5624409B2|1973-11-14|1981-06-05|
    GB1459774A|1973-12-12|1976-12-31|Sony Corp|Gain control circuit|
    JPS5625815B2|1974-02-14|1981-06-15|
    JPS5754969B2|1974-04-04|1982-11-20|
    JPS5717365B2|1974-05-31|1982-04-10|
    US4131809A|1974-06-17|1978-12-26|U.S. Philips Corporation|Symmetrical arrangement for forming a variable alternating-current resistance|
    JPS5918882B2|1975-11-07|1984-05-01|Sony Corp|
    JPS5726445B2|1976-08-11|1982-06-04|
    US4065725A|1976-08-16|1977-12-27|Motorola, Inc.|Gain control circuit|
    US4255716A|1977-09-10|1981-03-10|Tokyo Shibaura Denki Kabushiki Kaisha|Automatic gain control circuit|
    US4267518A|1979-09-13|1981-05-12|Sperry Corporation|Gain controllable amplifier stage|
    JP5258345B2|2008-03-27|2013-08-07|株式会社ジャパンディスプレイウェスト|Liquid crystal display|US4345214A|1980-04-23|1982-08-17|Rca Corporation|Variable emitter degeneration gain-controlled amplifier|
    JPH0418459B2|1982-09-20|1992-03-27|Tokyo Shibaura Electric Co|
    JPH02146201U|1989-05-15|1990-12-12|
    GB2236027A|1989-09-08|1991-03-20|Plessey Co Plc|Gain control of transistor|
    JPH06208635A|1993-01-11|1994-07-26|Nec Corp|Multiplier|
    US5742154A|1995-06-30|1998-04-21|Maxim Integrated Products|Multi-stage current feedback amplifier|
    JP2002043875A|2000-07-24|2002-02-08|Nec Corp|Variable gain amplifier and electronic equipment provided with the same|
    US7081796B2|2003-09-15|2006-07-25|Silicon Laboratories, Inc.|Radio frequency low noise amplifier with automatic gain control|
    US7457605B2|2004-09-10|2008-11-25|Silicon Laboratories, Inc.|Low noise image reject mixer and method therefor|
    TW200906055A|2007-07-27|2009-02-01|Rafael Microelectronics Inc|Low noise amplify|
    WO2011023210A1|2009-08-27|2011-03-03|VerigyPte. Ltd.|Adjustable gain amplifier, automated test equipment and method for adjusting a gain of an amplifier|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US06/143,032|US4344043A|1980-04-23|1980-04-23|Variable load impedance gain-controlled amplifier|
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