Demodulator and wireless receiver including the same
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United States of America Patent
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Jan 9, 2024
Grant Date -
Aug 4, 2022
app pub date -
May 25, 2020
filing date -
Jul 2, 2019
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Abstract
There is provided a demodulator that makes it possible to reduce or avoid deterioration in demodulation performance due to nonlinearity of input amplitude-frequency characteristics of a variable capacitive element included in an analog control signal input section of a frequency variable oscillator, while suppressing an influence of noise. The demodulator includes: a low-resolution A/D converter that performs analog-digital conversion of a first phase difference signal to generate a second phase difference signal that is digital; a low-resolution D/A converter that performs digital-analog conversion of the second phase difference signal to generate a third phase difference signal; an analog subtractor that subtracts the third phase difference signal from the first phase difference signal to generate a first control signal; an ADPLL that generates a second control signal; and an FVO that generates the oscillation signal on the basis of the first control signal and the second control signal.
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