Gain control circuit capable of reducing change in gain due...

Details Gain control circuit capable of reducing change in gain due... Gain control circuit capable of reducing change in gain due...

2008-07-15

2008-07-15

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including temperature compensation means

C330S285000

Reexamination Certificate

active

07400197

ABSTRACT:
A gain control circuit capable of keeping a constant gain without being affected by ambient temperature includes a variable resistor element connected to a power supply terminal, a control unit for controlling the resistance value of the variable resistor element on the basis of a gain control voltage, an amplifying transistor that is supplied with a power supply voltage through the variable resistor element, a current detecting resistor that is interposed between the variable resistor element and a collector of the amplifying transistor, and a voltage detecting unit that detects a drop dropped by the current detecting resistor. The dropped voltage detected by the voltage detecting unit is fed back to the control unit to control the resistance value of the variable resistor element such that a current flowing through the current detecting resistor does not vary.

REFERENCES:
patent: 7109897 (2006-09-01), Levesque
patent: 7-40652 (1995-05-01), None

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