Three-state digital mixer-driver circuit

Details Three-state digital mixer-driver circuit Three-state digital mixer-driver circuit

1980-05-27

1983-05-24

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455333, 375 1, 375 54, 375 94, H04B 110

Patent

active

043854010

ABSTRACT:
A mixer-driver circuit in a code correlator of a spread-spectrum communications system simultaneously multiplies an input RF signal with two phase-offset digitally encoded bit streams. A double-balanced mixer is driven with the difference of the digital signals; the mixer is either inverting, noninverting, or off. Matched ECL bistables which reclock the phase-offset bit streams, and a load current steering circuit coupled to the bistables together provide a balanced, differential drive current to the mixer which switches state faster than the bistables alone. In another embodiment, a single bistable receiving an encoded bit stream differentially drives the mixer in a biphase circuit.

REFERENCES:
patent: 3281073 (1966-10-01), Chou
patent: 3459966 (1969-08-01), Brahm
patent: 3924186 (1975-12-01), Gordy
patent: 4017798 (1977-04-01), Gordy
patent: 4122393 (1978-10-01), Gordy
patent: 4163944 (1979-08-01), Chambers

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