| CPC H03B 5/04 (2013.01) [H03B 5/366 (2013.01)] | 16 Claims |
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1. An oscillating device, arranged in an environment having an ambient temperature, comprising:
a heater;
a thermoelectric cooler;
a frequency source whose frequency is temperature-dependent on the ambient temperature;
a temperature controlled circuit electrically connected to the heater and the thermoelectric cooler, wherein, when the ambient temperature is in a first range between a first temperature and a second temperature higher than the first temperature, the temperature controlled circuit drives the heater to a target temperature to adjust an operating temperature of the frequency source, and when the ambient temperature is in a second range between a third temperature and a fourth temperature higher than the third temperature, the temperature controlled circuit drives the thermoelectric cooler to the target temperature to adjust the operating temperature of the frequency source; and
a voltage controlled oscillation circuit electrically connected to the frequency source and the temperature controlled circuit, wherein, when the ambient temperature is in the second range, the voltage controlled oscillation circuit drives the frequency source to reduce a frequency variation of the frequency source resulted from a variation of the ambient temperature;
wherein the third temperature is higher than the first temperature and the fourth temperature is higher than the second temperature;
wherein the temperature controlled circuit is configured to generate a control voltage based on the ambient temperature and the target temperature and transmit the control voltage to the voltage controlled oscillation circuit to drive the frequency source;
wherein the temperature controlled circuit comprises:
at least one temperature sensor electrically connected to the voltage controlled oscillation circuit, wherein the at least one temperature sensor senses the ambient temperature to generate a first detected voltage when the ambient temperature is in the first range, and the at least one temperature sensor senses the ambient temperature to generate a second detected voltage and a third detected voltage when the ambient temperature is in the second range;
a target temperature setting circuit electrically connected to the voltage controlled oscillation circuit, wherein the target temperature setting circuit generates a first control voltage based on the ambient temperature and the target temperature when the ambient temperature is in the first range, and the target temperature setting circuit generates a second control voltage and a third control voltage based on the ambient temperature and the target temperature when the ambient temperature is in the second range;
a first comparator electrically connected to the at least one temperature sensor, the target temperature setting circuit, and the heater and configured to receive the first control voltage and the first detected voltage and drive the heater based on the first control voltage and the first detected voltage; and
a second comparator electrically connected to the at least one temperature sensor, the target temperature setting circuit, and the thermoelectric cooler and configured to receive the second control voltage and the second detected voltage and drive the thermoelectric cooler based on the second control voltage and the second detected voltage;
wherein the voltage controlled oscillation circuit is configured to receive the third detected voltage and the third control voltage to drive the frequency source.
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