Variable gain circuit

Details Variable gain circuit Variable gain circuit

1996-02-23

1997-10-28

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330254, H03P 345

Patent

active

056821190

ABSTRACT:
A pair of input signals are connected to a first and second differential amplifier. The positive outputs of the differential amplifiers are connected to a first load and a first output terminal while the negative outputs are connected to a second load and a second output terminal. A constant current source is connected to each differential amplifier, and a control signal is connected to an input of a third differential amplifier and a third constant current source is connected to the third differential amplifier. Voltage to current conversion circuits convert voltage outputs of the third differential amplifier into current and input the resulted current to a reference current input terminal of the first and second constant current sources. Differential output signals are obtained from the first and second output terminals.

REFERENCES:
patent: 4227256 (1980-10-01), O'Keefe
patent: 4727335 (1988-02-01), Yokoyama
T. Tsukahara et al., "A 2V 2GHz Si-Bipolar Direct-Conversion Quadrature Modulator", IEEE International Solid State Circuits Conference, Feb. 1994, pp. 40-41.

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