Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled
Patent
1988-04-20
1989-08-29
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural oscillators controlled
331 25, H03L 700
Patent
active
048621064
ABSTRACT:
A PLL circuit includes a reference signal generator, a phase detector, a voltage controlled oscillator (VCO), a mixer, and a local oscillator. The VCO generates a signal having a desired frequency within a predetermined frequency bandwidth. A switch is connected between an output terminal of the phase detector, an output terminal of the mixer, and an input terminal of the VCO. The switch performs a switching operation to connect the output terminal of the phase detector to the input terminal of the VCO in a first state, and, in a second state, to connect the output terminal of the mixer to the input terminal of the VCO. A controller is connected to the switch so as to selectively supply first and second switching signals to the switch and establish connection relationships corresponding to the first and second states. The controller substantially determines a coincidence state between a frequency of an output signal from the VCO and a frequency of a local oscillation signal from the local oscillator, so as to generate the first switching signal for establishing the connection relationship corresponding to the first state, when a determination result representing a predetermined coincidence is not obtained, and to generate the second switching signal for establishing the connection relationship corresponding to the second state, when the determination result representing the predetermined coincidence is obtained.
REFERENCES:
"Frequency Synthesizers Theory and Design", Second Edition; Vadim Manassewitsch-Engineering Consultant; Wiley-Interscience Publication; John Wiley & Sons, pp. 98-100.
Hashizu Masaaki
Toda Kouichi
Anritsu Corporation
LaRoche Eugene R.
Pascal Robert J.
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