Gated quadrature detector biased to switch on sinusoidal zero cr

Details Gated quadrature detector biased to switch on sinusoidal zero cr Gated quadrature detector biased to switch on sinusoidal zero cr

1980-12-05

1983-06-28

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329137, 329145, 455214, 328166, H03D 322, H03K 906

Patent

active

043908454

ABSTRACT:
A quadrature detector includes a driving circuit for applying a frequency modulated square-wave to one input of a gating circuit and to the input of a phase-shift network whose output is connected directly to the other input of the gating circuit. A tracking DC bias voltage is introduced at the input of the gating circuit which is coupled to the output of the phase-shift network, and the level of this DC voltage is selected so that the gating circuit switches on the zero-crossings of the sinusoid outputted by the phase-shift network. This scheme eliminates the need for a limiter used in conventional quadrature detectors that operate from low-voltage power supplies such as a one volt battery.

REFERENCES:
patent: 2965848 (1960-12-01), Van Overbeek
patent: 3119064 (1964-01-01), Hillis
patent: 3373366 (1968-03-01), Schulz
patent: 3500217 (1970-03-01), Allen
patent: 3508161 (1970-04-01), Bingham
patent: 3548326 (1967-07-01), Bilotti
patent: 3798557 (1974-03-01), Scott et al.
patent: 3999138 (1976-12-01), Peil et al.
Adler, "FM Detector Tube With Instantaneous Limiting and Single-Circuit Discriminator", Radio News-Engineering Dept., Jun. 1948, pp. 17-18.

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