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US 2018/0323791 A1Published application
Frequency generating circuit using quartz crystal resonator
OwnerPing-Ying WANGinventor
Life of this patent
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Abstract
A frequency generating circuit includes: a delay circuit, arranged to operably delay an output frequency signal to generate a delayed signal; a quartz crystal resonator, coupled with the delay circuit, arranged to operably conduct a band-pass filtering operation on the delayed signal to generate the output frequency signal; and a delay control circuit, coupled with the delay circuit, arranged to operably control a phase delay amount of the delay circuit to thereby control the phase of the delayed signal.
Claims12
A frequency generating circuit (100), comprising:
- a delay circuit (110), arranged to operably delay an output frequency signal (Fout) to generate a delayed signal (Pd);
- a quartz crystal resonator (120), coupled with the delay circuit (110), arranged to operably conduct a band-pass filtering operation on the delayed signal (Pd) to generate the output frequency signal (Fout);
- a reference frequency generating circuit (130) arranged to operably generate a reference frequency signal (Fref) under control of a control signal (CTL);
- a delay control circuit (140), coupled with the delay circuit (110), arranged to operably control a phase delay amount of the delay circuit (110) to thereby control the phase of the delayed signal (Pd);
- and
- a calibration circuit (150), coupled with the quartz crystal resonator (120), the reference frequency generating circuit (130), and the delay control circuit (140), arranged to operably generate the control signal (CTL) according to the reference frequency signal (Fref) and one of the output frequency signal (Fout) and the delayed signal (Pd).
3 more elements
(canceled)
A frequency generating circuit (100), comprising:
- a delay circuit (110), arranged to operably delay an output frequency signal (Fout) to generate a delayed signal (Pd);
- a quartz crystal resonator (120), coupled with the delay circuit (110), arranged to operably conduct a band-pass filtering operation on the delayed signal (Pd) to generate the output frequency signal (Fout);
- and
- a delay control circuit (140), coupled with the delay circuit (110), arranged to operably control a phase delay amount of the delay circuit (110) to thereby control the phase of the delayed signal (Pd);
- wherein the delay control circuit (140) comprises:
- an operational amplifier (941) comprising a first input terminal (+) and a second input terminal (−), wherein the first input terminal (+) is coupled with the delay circuit (110) and arranged to operably control the phase delay amount of the delay circuit (110);
- a first resistance element (943), coupled between an output terminal and the first input terminal (+) of the operational amplifier (941);
- a second resistance element (947), coupled between the output terminal and the second input terminal (−) of the operational amplifier (941);
- and
- a third resistance element (949), coupled between the second input terminal (−) of the operational amplifier (941) and the fixed-voltage terminal.
7 more elements
Dependencies are inferred from the claim text.