Modulators – Phase modulator – Including discrete semiconductor device
Patent
1994-05-04
1995-04-25
Mis, David
Modulators
Phase modulator
Including discrete semiconductor device
332144, H03C 304
Patent
active
054102790
ABSTRACT:
There is provided a phase modulator having a low signal loss characteristic and a simple circuitry configuration, comprising a phase modulating circuit and a linearizer connected thereto, wherein the phase modulating circuit includes a transformer to which high frequency signal is inputted, a first PIN diode connected to one of the terminals of the secondary coil of the transformer, a second PIN diode connected to the other terminal of the secondary coil with the reverse polarity to the first PIN diode, and a capacitor and a choke coil connected to the connecting point between the first and second PIN diodes, and the linearizer includes an operational amplifier whose output terminal is connected to the choke coil, a signal input terminal connected to the inverting input terminal of the operational amplifier, a feedback resistor connected to the output terminal of the operational amplifier, and two diodes connected, in parallel and with reverse polarity, between the feedback resistor and the inverting input terminal of the operational amplifier.
REFERENCES:
patent: 2999987 (1961-09-01), Li
patent: 3566088 (1971-02-01), Crook
patent: 3624559 (1971-11-01), Schaeperkoetter
Mis David
NEC Corporation
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