Telecommunications – Receiver or analog modulated signal frequency converter – Convertible to different type
Patent
1986-02-28
1987-08-18
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Convertible to different type
455189, 455315, 455333, 455326, H04B 126
Patent
active
046882634
ABSTRACT:
A mixer is disclosed for use in a dual conversion AM-FM radio receiver in which AM and FM broadcast RF signals from a first IF amplifier are converted by the mixer from a first intermediate frequency to a second intermediate frequency for amplification in a second IF amplifier. A double balanced mixer circuit receives a signal at the first intermediate frequency and a local oscillator signal to generate signals at the second intermediate frequency on its two complementary outputs. One of the outputs is connected to the second IF stage through a narrow bandpass ceramic filter at the second intermediate frequency and a transistor switch. The other output is connected to the second IF stage through another transistor switch. The transistor switches are responsive to an external signal to alternatively connect the output through the ceramic filter for AM signals and the other output for FM signals. Both AM and FM outputs terminate in a single low impedance terminal with constant DC level for connection to the second IF amplifier.
REFERENCES:
patent: 3665507 (1972-05-01), Peil
patent: 3702968 (1972-11-01), Sawairi et al.
patent: 4058771 (1977-11-01), Ohsawa et al.
patent: 4313221 (1982-01-01), Mattfeld
patent: 4344188 (1982-08-01), Tanabe et al.
patent: 4480337 (1984-10-01), Graziadei et al.
General Motors Corporation
Ng Jin F.
Sigler Robert M.
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