Voltage controlled amplifier with a negative resistance circuit

Details Voltage controlled amplifier with a negative resistance circuit Voltage controlled amplifier with a negative resistance circuit

1995-09-28

1996-12-24

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330149, 330252, H23G 332, H03F 345

Patent

active

055876897

ABSTRACT:
A wide-band voltage controlled amplifier includes a differential stage and a gain control stage. The differential stage responds to a differential input signal by apportioning a bias current between the two sides of the differential stage. The gain control stage responds to a variable gain control voltage by further dividing the current in each side of the differential stage to set the gain of the VCA. The negative resistance circuit is connected across the differential stage to supply a correction current that reduces the non-linearity distortion in the current supplied to the gain control stage, which in turn improves the linearity of the VCA's output voltage.

REFERENCES:
patent: 4075574 (1978-02-01), Gilbert
patent: 4146844 (1979-03-01), Quinn
patent: 4692712 (1987-09-01), Quinn
patent: 4769617 (1988-09-01), Mizuide
patent: 4904952 (1990-02-01), Tanimoto
patent: 5138276 (1992-08-01), Marie
Sansen, Meyer, "Distortion in Bipolar Transistor Variable-Gain Amplifiers", IEEE J. Solid-State Circuits, vol. SC-8, pp. 275-282, Aug. 1973.

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