Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1987-01-09
1989-03-07
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455209, 455316, 455324, 455310, H04B 1506, H04B 110
Patent
active
048114251
ABSTRACT:
Apparatus for reducing the effects of mixer leakage in a zero IF transmission system includes first and second mixers having relatively equal leakage amounts from an oscillator port to an input port, with the input port of said first mixer adapted to receive a zero IF receiver input signal and with the output port of said first mixer capacitively coupled to the input port of the second mixer. The oscillator ports of the first and second mixers are coupled to a local oscillator output, with the output ports of said first and second mixers coupled respectively to an adder and subtractor circuit to provide respectively a DC signal indicative of the leakage and an output signal indicative of the magnitude of said input signal as effected by leakage to thereby enable the determination of said input signal after mixing.
REFERENCES:
patent: 3308389 (1967-03-01), Toman et al.
patent: 3953805 (1976-04-01), Couvillon
patent: 4254503 (1981-03-01), Vance
patent: 4328850 (1982-05-01), Vemura
patent: 4462107 (1984-07-01), Vance
patent: 4470147 (1984-09-01), Goatcher
patent: 4476585 (1984-10-01), Reed
patent: 4480327 (1984-10-01), Vance
patent: 4488064 (1984-12-01), Vance
patent: 4506262 (1985-03-01), Vance et al.
patent: 4509208 (1985-04-01), Sogo et al.
patent: 4521892 (1985-06-01), Vance et al.
patent: 4525835 (1985-06-01), Vance et al.
patent: 4540958 (1985-09-01), Neyens et al.
patent: 4584715 (1986-04-01), Baars et al.
patent: 4599743 (1986-07-01), Reed
"An Integrated Circuit V.H.F. Radio Receiver," The Radio and Electronic Engineer, vol. 50, No. 4, pp. 158-164, Apr. 1980; I. A. W. Vance.
Griffin Robert L.
ITT Avionics, A Division of ITT Corporation
Smith Ralph E.
Twomey Thomas N.
Walsh Robert A.
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