Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1990-11-13
1993-10-26
Kuntz, Curtis
Pulse or digital communications
Spread spectrum
Direct sequence
329325, 331 1A, 4551831, H03D 324
Patent
active
052572943
ABSTRACT:
A phase-locked loop circuit and method for producing an output signal which is phase locked with respect to an input signal are disclosed. The circuit includes a phase detector responsive to the phase relationship between the input signal and the output signal. A controlled signal generator, which includes a voltage controlled oscillator, generates the output signal and includes coarse adjust circuitry and fine adjust circuitry. The coarse adjust circuitry causes the frequency of the output signal to fall within one of a selected group of frequency bands in response to the frequency of the input signal. Once the coarse adjustment is made, the fine adjust circuitry continuously changes the frequency and phase of the output signal in response to the phase detector so that the output signal will be phase locked to the input signal.
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Fried Rafael
Pinto Victor
Kuntz Curtis
National Semiconductor Corporation
Tse Young
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