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US 2021/0344366 A1Published application
Frequency modulation circuit and transmitter
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorsXunyu Zhu, Yan Ye
Life of this patent
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Abstract
A frequency modulation circuit can include: a modulation circuit configured to generate a digital modulation signal and an analog modulation signal according to an input signal of the frequency modulation circuit; and a phase-locked loop having a voltage-controlled oscillator configured to receive a reference frequency, and to modulate a frequency of an output signal of the voltage-controlled oscillator according to the analog modulation signal and the digital modulation signal.
Claims20
A frequency modulation circuit, comprising:
- a) a modulation circuit configured to generate a digital modulation signal and an analog modulation signal according to an input signal of the frequency modulation circuit;
- and
- b) a phase-locked loop having a voltage-controlled oscillator configured to receive a reference frequency, and to modulate a frequency of an output signal of the voltage-controlled oscillator according to the analog modulation signal and the digital modulation signal.
Dependencies are inferred from the claim text.