Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1993-10-01
1996-06-11
Kuntz, Curtis
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455260, 331 11, 379 61, H04Q 732, H03L 700
Patent
active
055265278
ABSTRACT:
Methods and apparatus for frequency synthesization are shown for generating an output signal of desired frequency. The frequency synthesizer includes an oscillator for generating an output signal at the desired frequency in response to a control signal. A first detector compares the output signal to a reference signal and generates a first difference signal representative of the differences, preferably in phase and frequency, between the output and the reference signals. A second detector compares the output signal to the reference signal and generates a second difference signal. A controller generates the control signal in response to either the first or second difference signal. A selector member selects between the first and second detectors to provide either the first or second control signal to the controller in response to a selection signal. A lock detector detects when the output signal and said reference signal are in a predetermined relation and generates the switch signal in response to the detection of the occurrence of such predetermined relation.
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Bjerede Bjorn E.
Lipowski Joseph T.
O'Connor John F.
Jaquez Martin J.
Kuntz Curtis
Pacific Communication Sciences, Inc.
Richman, III Merle W.
Trost William G.
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