Three-state digital mixer-driver circuit
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United States of America Patent
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May 24, 1983
Grant Date -
N/A
app pub date -
May 27, 1980
filing date -
May 17, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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