Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1976-10-22
1977-11-15
Griffin, Robert L.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
325451, 325492, 328 15, 307271, H04B 126
Patent
active
040587711
ABSTRACT:
A frequency converter of the type having a local oscillating stage for producing a local oscillating signal and a double-balanced type mixing stage provided with a first pair of inputs for receiving a signal to be frequency converted and a second pair of inputs for receiving the local oscillating signal. The output of the mixing stage can be connected through a tuned circuit so as to frequency convert the input signal to an intermediate frequency (IF) signal. The local oscillating stage includes a first pair of differentially-connected transistors, the collector electrode of one being connected to a resonant circuit and, additionally, through an RC positive feedback circuit to the base electrode of the other transistor. The double-balanced type mixing stage includes a second pair of differentially-connected transistors, one of which being connected in cascade with a first differential amplifier and the other of which being connected in cascade with a second differential amplifier. The base electrodes of the second pair of differentially-connected transistors receive the local oscillating signal which is applied thereto in opposite phase relation. The first and second differential amplifiers both receive the input signal which is applied thereto in opposite phase relation. A DC bias circuit is provided for applying substantially equal bias voltages through equal impedances, such as resistors, to both pairs of differentially-connected transistors. Preferably, the DC bias circuit includes an emitter-follower.
REFERENCES:
patent: 3133160 (1964-05-01), Catto
patent: 3302118 (1967-01-01), Schoen
patent: 3491301 (1970-01-01), Thompson
patent: 3555303 (1971-01-01), Kozawa et al.
patent: 3949306 (1976-04-01), Watanabe et al.
Ohsawa Mitsuo
Yamatani Wataru
Eslinger Lewis H.
Griffin Robert L.
Ng Jin F.
Sinderbrand Alvin
Sony Corporation
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