Linear high frequency variable gain amplifier

Details Linear high frequency variable gain amplifier Linear high frequency variable gain amplifier

1997-09-26

1999-09-07

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330283, H03F 345

Patent

active

059492864

ABSTRACT:
A linear, high frequency, variable gain amplifier is disclosed. The amplifier includes a differential amplifier transistor pair for providing a gain controlled output signal in response to an input signal. Diode pairs connected between the emitters of the transistors, in conjunction with transistor gain control circuitry, provide for gain control of the output signal. A dummy amplifier connected to the differential amplifier transistor pair cancels the capacitance effects created by the diode pair.

REFERENCES:
Liu, "Differential Variable-Gain Amplifier", IBM Technical Disclosure Bulletin, vol. 15, No. 5, Oct. 1972.

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