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

Claim 0:
1. 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, wherein each of the inductor, the fixed capacitor, the variable capacitor, the first temperature compensating capacitor and the second temperature compensating capacitor has an end connected to the first node and an opposite end connected to 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.