Full wave envelope detector using current mirrors

Details Full wave envelope detector using current mirrors Full wave envelope detector using current mirrors

1982-06-01

1984-11-27

Laroche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329166, 328 26, 363127, H03D 114, H02M 7217

Patent

active

044853483

ABSTRACT:
The fullwave bridge envelope detector comprises first, second, third, and fourth rectifier circuits each of which are coupled to receive first or second alternating input signals which are 180 degrees out of phase. The first and third rectifier circuits each include a diode connected transistor and an additional transistor coupled in current mirror relationship therewith so as to produce halfwave rectified versions of the first and second alternating input signals respectively. The second and fourth rectifier circuits each comprise a transistor which is rendered conductive when first and second alternating input signals respectively become negative. The halfwave rectified signals produced by the first and second rectifier circuits and the halfwave rectified signals produced by the third and fourth rectifier circuits are summed at an output node to produce the fullwave rectified version.

REFERENCES:
patent: 4041334 (1977-08-01), Umeda
patent: 4158882 (1979-06-01), Citta
patent: 4336586 (1982-06-01), Lunn
patent: 4445054 (1984-04-01), Ishii

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