Temperature compensated PLL frequency synthesizer and high-speed

Details Temperature compensated PLL frequency synthesizer and high-speed Temperature compensated PLL frequency synthesizer and high-speed

1994-06-29

1995-12-19

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 16, 331176, H03L 700

Patent

active

054771943

ABSTRACT:
The present invention relates to a PLL frequency synthesizer including an A-D converter for receiving a frequency control voltage for a voltage-controlled oscillator for outputting a desired frequency in a frequency stable state, and converting the frequency control voltage into a corresponding digital signal and outputting the digital signal, a storage unit for storing a signal value of the digital signal, a D-A converter for converting the signal value into a corresponding analog signal and outputting the analog signal, a control unit for controlling input of the frequency control voltage to the A-D converter, reading of the signal value from the storage unit, and output of the analog signal from the D-A converter, and a loop filter for applying an output voltage of the analog signal to the voltage-controlled oscillator by the control unit before the synthesizer is started, and a high-speed frequency lock method using this synthesizer.

REFERENCES:
patent: 4980652 (1990-12-01), Tarusawa et al.
patent: 5036295 (1991-07-01), Kamitani
patent: 5334952 (1994-08-01), Maddy et al.

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