Differential amplifier and high frequency resonant circuits cons

Details Differential amplifier and high frequency resonant circuits cons Differential amplifier and high frequency resonant circuits cons

1992-03-26

1993-02-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330306, 331108B, 331 57, H03F 345

Patent

active

051855810

ABSTRACT:
A differential amplifier includes a bias current source and a current dividing circuit for controllably dividing a bias current between first and second current paths. A first pair of matched transistors is connected as a differential pair between matched load impedances and the first current path. A second pair of matched transistors is connected as a differential pair between the matched load impedances and the second current path. Differential inputs of the second differential pair are connected to corresponding differential inputs of the second differential pair. The transistors of the first and second pairs have different emitter areas. Matched capacitors may be connected between respective differential inputs and differential outputs of the differential amplifier. The load impedances may be tapped to provide outputs having a lower differential gain. The differential amplifier is useful for building resonant circuits, for example voltage controlled oscillators having high Q factors.

REFERENCES:
patent: 4516081 (1985-05-01), Katakura
patent: 5093634 (1992-03-01), Khoury
"Phase Noise in Signal Sources" (Theory and Applications), W. P. Robins, IEE Telecommunications Series 9, pp. 47-53, (Peter Peregrinus Ltd., 1982).

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