Patent ID: 9680479
Date: 2017-06-13
CPC Classifications: H03B,H03L

Claim:
1. An electronic apparatus comprising: a voltage-controlled oscillator, comprising at least one varactor and configured to output an oscillating frequency at a first temperature; and a biasing circuit, electrically coupled with the at least one varactor and configured to provide at least one first biasing voltage to the at least one varactor at the first temperature, and to provide at least one second biasing voltage to the at least one varactor at a second temperature, in which the at least one varactor has a first temperature coefficient, and the biasing circuit generates the at least one first biasing voltage and the at least one second biasing voltage according to values of the first temperature coefficient and a second temperature coefficient; wherein when the temperature changes from the first temperature to the second temperature, a capacitance of the varactor has a first biasing amount, when a bias voltage received by the varactor changes from the first bias voltage to the second bias voltage, the capacitance of the varactor has a second biasing amount, and the first biasing amount and the second biasing amount cancel each other out.