VCO driving circuit and frequency synthesizer

Details VCO driving circuit and frequency synthesizer VCO driving circuit and frequency synthesizer

2008-07-22

2010-10-26

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S017000, C331S176000, C327S156000

Reexamination Certificate

active

07821344

ABSTRACT:
A VCO driving circuit and a frequency synthesizer wherein the impedance viewed from a VCO control terminal is reduced to prevent the VCO phase noise characteristic from degrading. A VCO driving circuit and a frequency synthesizer having the VCO driving circuit, which comprises a coarse adjustment DAC that receives a digital data, which has a coarse adjustment frequency, to output an analog signal; a fine adjustment DAC that receives a digital data, which has a fine adjustment frequency, to output an analog signal; a low response speed LPF5that removes noise from the output signal from the coarse adjustment DAC and then provides the resultant signal as an input to a VCO control terminal; a high response speed LPF7that converts the output signal from the fine adjustment DAC to a voltage, thereby smoothing the signal; a resistor that connects an input stage of the LPF5to that of the LPF7; and a capacitor used for providing a capacitive coupling such that the output of the LPF7is added to that of the LPF5.

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patent: 2004-274673 (2004-09-01), None

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