Variable gain mixer having improved linearity and lower switchin

Details Variable gain mixer having improved linearity and lower switchin Variable gain mixer having improved linearity and lower switchin

1995-06-09

1996-12-31

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

327356, 330254, G06G 716

Patent

active

055897916

ABSTRACT:
A mixer section is combined with a post-mixer linearizer to counteract the nonlinear transconductance characteristics of the RF input section of the mixer thereby increasing the overall linear response of the mixer. The post-mixer linearizer has a response that is increasingly non-linear outside the non-linear operating range of the RF input section. This non-linear response compensates for the decreasingly non-linear response of the RF input section. Current mirrors in the post-mixer linearizer increase the rail-to-rail headroom of the mixer while maintaining high gain. An input driver is coupled to the mixer that provides quick switching transitions in the mixer to reduce noise effects. The mixer also includes a gain control circuit that provides linear-in-decibel gain control.

REFERENCES:
patent: 3736520 (1973-05-01), Acker
patent: 3970774 (1976-07-01), Bazin et al.
patent: 4076959 (1978-02-01), Gilbert et al.
patent: 4156283 (1979-05-01), Gilbert
patent: 4292596 (1981-09-01), Ishizuka et al.
patent: 4454433 (1984-06-01), Welland
patent: 4572975 (1986-02-01), Bowers
patent: 4621238 (1986-11-01), Fenk
patent: 4764892 (1988-08-01), Thomas
patent: 4990803 (1991-02-01), Gilbert
patent: 5057716 (1991-10-01), Kung
patent: 5442311 (1995-08-01), Trafton
"Analog IC design: the current-mode approach," by Barrie Gilbert, Chapter 2, pp. 11-39 and 52-91.
"Analog IC design: the current-mode approach," Barrie Gilbert, Chapter 6, pp. 239-296.

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