Patent ID: 11949376
Assignee: REALTEK SEMICONDUCTOR CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A VCO (voltage-controlled oscillator) comprising:
a resonant tank comprising a parallel connection of an inductor, a fixed capacitor, a variable capacitor, a first temperature compensating capacitor, and a second temperature compensating capacitor across a first node and a second node, and configured to establish an oscillation of a first oscillatory voltage at the first node and a second oscillatory voltage at the second node;
a regenerative network placed across the first node and the second node to provide energy to sustain the oscillation, wherein the variable capacitor is controlled by a control voltage, the first temperature compensating capacitor is controlled by a first temperature tracking voltage of a positive temperature coefficient, and the second temperature compensating capacitor is controlled by a second temperature tracking voltage of a negative temperature coefficient; and
a temperature tracking voltage generator configured to output the first temperature tracking voltage and the second temperature tracking voltage based on a first current and a second current that are both proportional to an absolute temperature.