TEMPERATURE-COMPENSATED CRYSTAL OSCILLATOR BASED ON ANALOG CIRCUIT
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United States of America Patent
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Jan 11, 2018
app pub date -
Sep 21, 2017
filing date -
May 17, 2017
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Abstract
Disclosed is a temperature-compensated crystal oscillator based on analog circuit; a closed-loop compensation architecture determines the temperature compensation of a crystal oscillator. The power splitter divides the VCXO's current output signal with frequency f=f0+Δf into two signals, one signal to output of the TCXO and the other signal is sent to an analog frequency-voltage conversion circuit. According to the frequency of the VCXO's current output signal, the analog frequency-voltage conversion circuit produces a voltage signal V(T), which corresponds to current ambient temperature. The difference between V(T) and a reference voltage signal Vref is produced and amplified to obtain a compensation voltage signal ΔV through a voltage matching circuit. ΔV is smoothed by a filter, then sent to the voltage control terminal of the VCXO to make the VCXO generate a stable signal with desired frequency f0, to compensate the frequency of the VCXO's output signal when the ambient temperature is changed.
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