Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1987-02-26
1989-03-28
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455197, 455337, H04B 126
Patent
active
048172006
ABSTRACT:
A tracking YIG tuned filter-mixer circuit is provided. In the preferred embodiment, four YIG-tuned resonators are combined to provide a tracking filter-mixer with a switched input. Field coils produce a magnetic tuning field that is uniform over the four YIG resonators. The first YIG resonator acts as the first stage of the filter, and in combination with a PIN diode circuit switches the RF input signal either to an output port or into the succeeding stages of the filter mixer. The second YIG resonator acts as the second stage of the filter. The third YIG resonator acts as the third stage of the filter, and as a fundamental mixer for combining the input RF signal with a swept LO signal to produce the IF output signal. The fourth YIG resonator acts as a discrimintor, comparing the LO frequency to the filter tuning frequency to generate an error signal for the field coil drive circuit. A small magnetic field coil over the fourth YIG resonator produces an offset magnetic field, tuning the fourth YIG resonator to the swept LO frequency, above the other three resonators by the IF frequency, so that the three YIG resonators that comprises the filter stages track the LO but are tuned to the RF frequency.
REFERENCES:
patent: 3364430 (1968-01-01), Goodman et al.
patent: 3435346 (1969-03-01), Allen et al.
patent: 3839677 (1974-10-01), Sedin
patent: 3973204 (1976-08-01), Keiter
patent: 4059803 (1977-11-01), Mikhailovsky
patent: 4169253 (1979-09-01), Cohen
Griffin Robert L.
Hewlett--Packard Company
Kuntz Curtis
Milks, III William C.
Williams James M.
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