Differential amplifier with digitally controlled gain

Details Differential amplifier with digitally controlled gain Differential amplifier with digitally controlled gain

1990-01-26

1991-09-03

Wallace, Linda J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330283, 3072992, H03F 345

Patent

active

H00009652

ABSTRACT:
Differential amplifier having multiple stages, each stage having the gain thereof set by digital control. The gain of each stage is individually controlled, thereby allowing wide dynamic range and gain. Each stage has a differential pair with multiple sets of gain-setting resistors in the emitters of the pair. By selecting which resistor set, or combination of resistor sets, is used, the gain of the stage is controlled. The result is a 4 stage, 0-45 dB gain amplifier for RF or IF applications, with the gain adjustable in 3 dB increments.

REFERENCES:
patent: 4378528 (1983-03-01), Harford
Bardell, Jr. et al., "Three-Level Inverter Using a Two-Emitter Transistor", IBM Technical Disclosure Bulletin, vol. 4, No. 3, Aug. 1981; p. 80.
Millican, "Four-Level Gain Control Stage", IBM Technical Disclosure Bulletin, vol. 14, No. 9, Feb. 1972, pp. 2639, 2640.
"Digital Gain Control Wins OP Amp A Niche in Microprocessor Systems," The Handbook of Linear IC Applications, 1987 pp. 85 through 89.

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