Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1983-05-16
1985-04-16
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455183, 455186, 455316, H03J 718, H04B 116
Patent
active
045120358
ABSTRACT:
A method of programming a ROM for a multiple conversion frequency synthesizer provides a mechanism for avoiding receiver self-quieting. The method includes the steps of searching for frequencies which cause potential receiver self-quieting responses and selecting a second local oscillator frequency suitable for avoiding receiver self-quieting. A single bit of a ROM is used to represent possible second local oscillator frequencies synthesized by the frequency synthesizer which provide either high-side or low-side injection to the second mixer. Finally, the method includes the step of encoding the single second local oscillator frequency determining bit of the ROM appropriately for selecting the local oscillator frequency which avoids receiver self-quieting.
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New Products "Synthesized Communications Receiver", Wireless World, 12/1977, vol. 83, No. 1504.
Davis Darrell E.
Victor Alan M.
Downey Joseph T.
Gillman James W.
Motorola Inc.
Ng Jin F.
Roney Edward M.
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