公开(公告)号：US20180013384A1

公开(公告)日：2018-01-11

申请号：US15711430

申请日：2017-09-21

Applicant: UNIVERSITY OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA

Inventor： Feng TAN ,  Duyu QIU ,  Peng YE ,  Jiquan CHEN ,  Lianping GUO ,  Hao ZENG ,  Shuo ZHANG ,  Ke TANG

IPC: H03B5/04 ,  H03L1/02 ,  H03B5/36

CPC classification number: H03B5/04 ,  H03B5/366 ,  H03L1/02 ,  H03L1/023 ,  H03L1/028 ,  H03L7/00 ,  H03L7/06

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.