| 摘要 |
<p>A Voltage Controlled Oscillator (VCO) in a battery-powered device, such as a cellular phone, can be configured to tune across a fairly wide frequency range using a relatively narrow control voltage range. The frequency response of the VCO can be temperature compensated by applying a temperature variable voltage source to varactors that form part of a VCO resonant circuit. The reference end of the varactor can be supplied with a temperature dependent voltage source that has a temperature dependence that substantially compensates for varactor temperature dependence. The temperature dependent voltage source can be a Proportional To Absolute Temperature (PTAT) device.</p> |
