Envelope detector

Details Envelope detector Envelope detector

1988-08-29

1989-12-26

Mis, David

Demodulators

Amplitude modulation demodulator

Including three or more terminal discrete semiconductor...

329370, 329349, 455312, H03D 118, H03D 106, H03K 902

Patent

active

048900664

ABSTRACT:
Envelope detector comprising a differential amplifier (A), a full-wave rectifier circuit and a smoothing filter (AF), which differential amplifier (A) converts an input voltage into a pair of current signals in phase opposition and which full-wave rectifier circuit comprises a pair of half-wave rectifiers (HWR1, HWR2) for half-wave rectifying the said pair of current signals, coupled to a first combining stage (S) for combining the output signals of the two half-wave rectifiers (HWR1, HWR2) with like polarity, which first combining stage (S) supplies a full-wave rectified signal. In order to reduce d.c. offsets, the detector comprises a frequency-dependent negative feedback loop which comprises a second combining stage (D) coupled to the outputs (R.sub.o1, R.sub.o2) of the pair of half-wave rectifiers (HWR1, HWR2) for combining the output signals of the pair of half-wave rectifiers (HWR1, HWR2) with opposite polarity, said second combining stage (D) being negatively fed back to the input (I.sub.c) of the differential amplifier (A) via a low-pass filter (LPF) for a selection of the d.c. component.

REFERENCES:
patent: 3904989 (1975-09-01), Cordell
patent: 4553102 (1985-11-01), Yoshida

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