Variable gain direct coupled amplifier
阅读：520发布：2023-11-06
专利汇可以提供Variable gain direct coupled amplifier专利检索，专利查询，专利分析的服务。并且A transistor amplifier comprising input circuitry for simultaneously adjusting, in response to a control signal, the gain of a transistor amplifying stage and the magnitude of its input signal, and output circuitry for maintaining constant the DC output voltage of the stage as the gain of the stage is varied. The input circuitry includes a control transistor whose collector to emitter path is comprised in the output legs of first and second voltage dividers. A gain control signal, e.g., an AGC signal, applied to the base of the control transistor controls the collector to emitter resistance of the control transistor, thereby controlling simultaneously the respective voltage divisions effected by the two dividers. The first divider controls the gain of the transistor amplifying stage by controlling its operating bias, and the second divider determines the fraction of the input signal applied to the amplifying stage. The output circuitry includes a third transistor the collector and emitter of which are directly connected to the collector and emitter respectively of the amplifying transistor and the base of which is supplied with the gain control signal. The two transistors share the same collector load resistor. As the gain control signal varies, the DC collector current of the third transistor changes in a direction opposite to that in which the collector current of the amplifying transistor changes, and by a substantially equal amount. Since the amplifying and third transistors share the same load resistor, the net DC current therethrough remains constant. Hence the DC output voltage of the stage also remains constant.，下面是Variable gain direct coupled amplifier专利的具体信息内容。
1. In an amplifier comprising: a. first amplifying means having a control element and first and second electrodes and responsive to variations in a signal applied to said control element to vary an electric current flowing through said second electrode, and means for applying a time-varying signal between said control element and said first electrode, b. direct-current-conductive means for connecting said first electrode to a point at reference potential, c. first resistive means for connecting said second electrode to a source of operating potential and for conducting the timevarying electric current flowing through said second electrode in response to said time-varying input signal, thereby to produce a time-varying voltage across said first resistive means, and, d. means for supplying a control signal to said control element, the value of the current flowing in said second electrode and said first resistive means changing (i) in a given direction in response to a variation in a certain sense of the magnitude of said control signal and (ii) by an amount dependent on the extent of said magnitude variation of said control signal, the improvement comprising e. second amplifying means having a control element and first and second electrodes and responsive to variations in a signal to vary an electric current flowing through said second electrode thereof, means directly connecting said first electrode of said second amplifying means to said first electrode of said first amplifying means, and means directly connecting said second electrode of said second amplifying means to said second electrode of said first amplifying means, and f. means for supplying said control signal to said control element of said second amplifying means in a sense such as to change in a given direction the value of said current flowing through said second electrode of said second amplifying means when the value of said current flowing through said second electrode of said first amplifying means is changed by said control signal supplied to said control electrode of said first amplifying means, in a direction opposite said given direction.
2. An amplifier according to claim 1, wherein said means for supplying said control signal to said control element of said first amplifying means comprises: a. third amplifying means comprising a control element and first and second electrodes and responsiVe to variations in a signal applied to said control element thereof to vary an electric current flowing through said second electrode thereof. b. means directly connecting said first electrode thereof to said first electrode of said first amplifying means, c. second resistive means connecting said second electrode of said third amplifying means to said control element of said first amplifying means, d. third resistive means connecting said second electrode of said third amplifying means to a source of bias potential other than said operating potential, and e. means for supplying said control signal to said control element of said third amplifying means,
3. An amplifier according to claim 2, wherein said source of bias potential comprises fourth amplifying means having a control element and first and second electrodes and responsive to variations in a signal applied to said control element to vary an electric current flowing through said second electrode thereof, means directly connecting said control element of said fourth amplifying means to said second electrode of said first amplifying means, means directly connecting said first electrode of said fourth amplifying means to a source of operating potential, fourth resistive means connecting said second electrode of said fourth amplifying means to said third resistive means at a junction, and fifth resistive means connecting said junction to said point at reference potential, and wherein said third resistive means connects said junction to said second electrode of said third amplifying means.
4. An amplifier according to claim 1, wherein each of said first amplifying means and said second amplifying means is a bipolar transistor having a base of given conductivity type.
5. An amplifier according to claim 1, wherein each one of said first and said second amplifying means comprises a bipolar transistor having an emitter electrode, a collector electrode, a base electrode and a base of given conductivity type, said emitter electrode, said collector electrode and said base electrode being respectively said first electrode, said second electrode and said control element of said one of said two amplifying means.
6. An amplifier according to claim 2, wherein each one of said first, second and third amplifying means comprises a bipolar transistor having an emitter electrode, a collector electrode, a base electrode and a base of given conductivity type, said emitter electrode, said collector electrode and said base electrode being respectively said first electrode, said second electrode and said control electrode of said one of said three amplifying means.
7. An amplifier according to claim 3, wherein each one of said first, second and third amplifying means comprises a bipolar transistor having an emitter electrode, a collector electrode, a base electrode and a base of given conductivity type, said emitter electrode, said collector electrode and said base electrode being respectively said first electrode, said second electrode and said control electrode of said one of said three amplifying means, and said fourth amplifying means comprises an additional bipolar transistor having an emitter electrode, a collector electrode a base electrode and a base of said given conductivity type, said emitter electrode, said collector electrode and said base electrode of said additional transistor being respectively said second electrode, said first electrode and said control electrode of said fourth amplifying means.
8. In an amplifier comprising: a. first amplifying means having a control element and first and second electrodes and responsive to variations in a signal applied to said control element to vary an electric current flowing through said second electrode, b. means for applying a time-varying input signal between said control element and said first electrode, c. direct-current-conductive means for connecting said first electrode to a point at reference potential, d. first resistive means for connecting said second electrode to a source of operating potential and for conducting the time-varying electric current flowing through said second electrode in response to said time-varying input signal, thereby to produce a time-varying voltage across said first resistive means, and e. means for applying a control signal to said control element, the improvement comprising f. second amplifying means comprising a control element and first and second electrodes and responsive to variations in a signal applied to said control element thereof to vary an electric current flowing through said second electrode thereof, g. means directly connecting said first electrode of said second amplifying means to said first electrode of said first amplifying means, h. second resistive means connecting said second electrode of said second amplifying means to said control element of said first amplifying means, i. third resistive means connecting said second electrode of said second amplifying means to a source of bias potential different from said operating potential, and j. means for supplying said control signal to said control element of said second amplifying means.
9. An amplifier according to claim 8, wherein each one of said first and said second amplifying means comprises a bipolar transistor having an emitter electrode, a collector electrode, a base electrode and a base of given conductivity type, said emitter electrode, said collector electrode and said base electrode being respectively said first electrode, said second electrode and said control element of said one of said two amplifying means.
10. An amplifier according to claim 8, wherein said means for applying said input signal comprises resistive means connected to said control element of said first amplifying means.
11. An amplifier according to claim 8, wherein: a. said means for applying said input signal comprises resistive means connected to said control element of said first amplifying means, and b. each one of said first and said second amplifying means comprises a bipolar transistor having an emitter electrode, a collector electrode, a base electrode and a base of given conductivity type, said emitter electrode, said collector electrode and said base electrode being respectively said first electrode, said second electrode and said control element of said one of said two amplifying means.
12. An amplifier according to claim 3, wherein said means for applying said input signal comprises resistive means having one terminal connected to said control electrode of said first amplifying means and having a second terminal for receiving said input signal.
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