Automatic control of amplifier gain using degeneration

Details Automatic control of amplifier gain using degeneration Automatic control of amplifier gain using degeneration

2005-05-17

2005-05-17

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S283000

Reexamination Certificate

active

06894563

ABSTRACT:
A technique for automatically controlling the gain of an amplifier by using a transistor as a voltage controlled variable degeneration resistor. The apparatus and method may be advantageously adapted for use in either voltage-to-current amplifiers or voltage-to-voltage amplifiers, single-ended or differential designs. One benefit of this technique is that, since the bias current is constant, the transistors operate in the correct region (i.e. the transistors are not biased out of the operating region). Additionally, the control mechanism is well-bounded.

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patent: 6529077 (2003-03-01), Dasgupta
Loinaz, Marc J. and Wooley, Bruce A.,A CMOS Multichannel IC for Pulse Timing Measurements with 1-mV Sensitivity, IEEE Journal of Solid-State Circuits, vol. 30, No. 12, Dec. 1995.

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