Variable gain amplifier for low supply voltage systems

Details Variable gain amplifier for low supply voltage systems Variable gain amplifier for low supply voltage systems

1994-03-31

1995-05-23

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330283, H03F 345, H03G 330

Patent

active

054184940

ABSTRACT:
A variable gain amplifier which includes a first voltage-to-current amplifier having a fixed gain; a second voltage-to-current amplifier having a variable gain, functioning in parallel to said first amplifier; a gain control and stabilization variable current generator; and a current-to-voltage converter. Current output signals produced by said first and second amplifiers and by said variable current generator are summed and the resulting current signal is converted to a voltage signal by said converter.

REFERENCES:
patent: 3891937 (1975-06-01), Bockelmann et al.
IEEE Journal of Solid-State Circuits, vol. 24, No. 4, Aug. 1989, New York US, pp. 951-961, Tzu-Wang Pan E. A. `a 50-dB variable gain amplifier using parasitic bipolar transistors in CMOS.` *pp. 957-959, chapter 4: "IV. A variable gain amplifier"* *FIG. 9*.
Patent Abstracts of Japan, vol. 15, No. 169 (P-1196) Apr. 26, 1991 & JP-A-30 33 989 (NEC Corp.) Feb. 14, 1991 *abstract*.

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