Intermediate frequency amplification circuit capable of detectin

Amplifiers – With amplifier condition indicating or testing means

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330252, 455155, H03F 345

Patent

active

047943424

ABSTRACT:
In an intermediate frequency amplification circuit comprising first through n-th differential amplifiers which are connected in cascade to one another with the first amplifier supplied with a circuit input signal and which successively produce amplifier output signals with an n-th amplifier output signal produced as a circuit output signal from the n-th amplifier, first through (n+1)-th rectification circuits are supplied with respective amplifier output signals with the circuit input signal given to the first rectification circuit. Each rectification circuit comprises a differential unit comprising at least one pair of transistors which have different emitter areas from each other to rectify each amplifier output signal and to produce a collector current which is summed up by an adder circuit to be produced as a field strength signal. The rectification circuits may carry out either half-wave rectification or full-wave rectification. A plurality of the above-mentioned pairs may be included in each rectification circuit.

REFERENCES:
patent: 4680553 (1987-07-01), Kimura et al.

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