Voltage-controlled variable gain amplifier专利检索-可变增益放大器差分放大器电子零件及设备专利检索查询-专利查询网

Voltage-controlled variable gain amplifier

阅读：742发布：2023-11-16

专利汇可以提供Voltage-controlled variable gain amplifier专利检索，专利查询，专利分析的服务。并且A transistorized voltage-controlled variable-gain audio amplifier including a transistor connected as a common-emitter amplifier, and a control circuit coupled to the emitter of the amplifying transistor and operative in response to a direct control signal to vary the impedance at the emitter without changing the voltage thereat. The control circuit includes a second transistor having matched collector and emitter resistors connected to a source of energizing potential and to ground respectively, and a branch circuit including at least two forward-biased semi-conductor diodes connected in series between the collector and emitter of the transistor. The junction between the diodes is connected through a capacitor to the emitter of the amplifying transistor thereby to effectively connect the impedance of the branch circuit in parallel with the emitter resistor of the amplifying stage. A direct control voltage applied to the base of the control transistor varies the current through the diodes to vary their impedance, and consequently the impedance at the emitter of the amplifying transistor, without changing the voltage at the emitter, to thereby vary the gain of the amplifying stage.，下面是Voltage-controlled variable gain amplifier专利的具体信息内容。

权利要求

1. A voltage-controlled variable-gain amplifier system comprising, in combination, an amplifier stage including a first transistor having a base, an emitter and a collector, means to apply an input signal to the base of said first transistor relative to ground, a first resistor connected between the emitter of said first transistor and ground, A second resistor connected between the collector of said first transistor and a source of direct current potential, a control transistor having a base, an emitter and a collector, a third resistor connected between the emitter of said control transistor and ground, a fourth resistor having a resistance substantially equal to the resistance of said third resistor connected between the collector of said control transistor and said source of direct current potential, a branch circuit including a fifth resistor, at least first and second forward-biased semi-conductor diodes, and a sixth resistor having a resistance substantially equal to the resistance of said fifth resistor, connected in series in the order named between the collector and the emitter of said control transistor, a capacitor connected solely between the junction of said first and second diodes and the emitter of said first transistor, whereby the impedance of said branch circuit is effectively connected in parallel with said first resistor, and means to apply a direct control voltage to the base of said control transistor to vary the current through said diodes and thereby the impedance at the emitter of said first transistor, without changing the voltage thereat thereby to vary the gain of said amplifier stage.

2. Apparatus in accordance with claim 1 wherein said branch circuit further includes a third forward-biased semi-conductor diode connected between said fifth resistor and said first diode and a fourth forward-biased semi-conductor diode connected between said second diode and said sixth resistor, a third transistor having a base, an emitter and a collector, means directly connecting the emitter of said third transistor to the base of said control transistor, means directly connecting the collector of said third transistor to the collector of said control transistor, and means to apply said direct control voltage to the base of said third transistor.

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Voltage-controlled variable gain amplifier

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