Balanced mixer using complementary devices

Details Balanced mixer using complementary devices Balanced mixer using complementary devices

1976-07-16

1978-03-21

Griffin, Robert L.

325446, 325436, 325451, H04B 106

Patent

active

040805735

ABSTRACT:
Frequency changing circuits are disclosed which each include an unbalanced input circuit, complementary mixing devices and a balanced output circuit. The mixer input signals are cancelled in the balanced output circuit. Moreover, whatever mixer out-of-phase output signals that are undesirably fed back to the input circuit are cancelled in the unbalanced input circuit. Also, circuitry is disclosed for rendering one or the other of the complementary mixing transistors inoperative so that the other of the complementary transistors can operate as a neutralized amplifier for utilization in a television receiver adapted to receive both VHF and UHF signals.

REFERENCES:
patent: 2044745 (1936-06-01), Hansell
patent: 2857511 (1958-10-01), Tongue
patent: 2923888 (1960-02-01), Buesing
patent: 3241071 (1966-03-01), Alford
patent: 3416086 (1968-12-01), Carlson
patent: 3694756 (1972-09-01), Carlson
patent: 3727078 (1966-03-01), Wollesen

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