Logarithmic intermediate frequency amplifier circuit operable on

Details Logarithmic intermediate frequency amplifier circuit operable on Logarithmic intermediate frequency amplifier circuit operable on

1994-11-03

1995-12-12

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

327352, G06F 7556, G06G 720

Patent

active

054753287

ABSTRACT:
In a logarithmic intermediate frequency amplifier circuit including first through M-th intermediate frequency amplifiers which are connected in cascade and first through M-th double balanced differential circuits which are connected to the first through the M-th intermediate frequency amplifiers, respectively, each of the first through the M-th double balanced differential circuits comprises primary, secondary, and tertiary differential circuits. The primary differential circuit includes a pair of transistors each of which is one of NPN and PNP types and which are connected to a first constant current source. The secondary differential circuit includes a pair of transistors each of which is another one of NPN and PNP types and which are connected to a second constant current source. The tertiary differential circuit includes a pair of transistors each of which is the other one of the NPN and the PNP types and which are connected to a third constant current source. The primary differential circuit is connected to the second and the third constant current sources and delivers a differential output to the secondary and the tertiary differential circuits so as to reduce currents of the second and the third constant current sources.

REFERENCES:
patent: 4052679 (1977-10-01), Hosoya
patent: 4187537 (1980-02-01), Avicola et al.
patent: 4663594 (1987-05-01), Perkins
patent: 4680553 (1987-07-01), Kimura et al.
patent: 4794342 (1988-12-01), Kimura
patent: 4937516 (1990-06-01), Sempel
patent: 5057717 (1991-10-01), Kimura
patent: 5329189 (1994-07-01), Ushida et al.
patent: 5345185 (1994-09-01), Gilbert

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