Voltage controlled oscillator with switched tuning capacitors

Details Voltage controlled oscillator with switched tuning capacitors Voltage controlled oscillator with switched tuning capacitors

2006-07-18

2006-07-18

Chang, Joseph (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S1170FE, C331S17700V

Reexamination Certificate

active

07078980

ABSTRACT:
The LC-VCO is provided with two negative resistance units and an LC circuit unit. The LC circuit unit has two output terminals. An inductor is connected between the output terminals, and a series of variable capacitors is connected in parallel with the inductor. In the LC circuit unit, a variable capacitor is connected between one of the output terminals and a node. Another variable capacitor is connected between the other output terminal and another node. Switches are connected between the nodes and a ground potential line, respectively, and between the nodes and a power supply potential line, respectively.

REFERENCES:
patent: 3988701 (1976-10-01), Funston
patent: 6876266 (2005-04-01), Koo et al.
patent: 2004/0080374 (2004-04-01), Muramatsu
patent: 2004/0169564 (2004-09-01), Muramatsu
A. Krai et al., “RF-CMOS Oscillators with Switched Tuning”, IEEE Custom Integrated Circuits Conference, pp. 555-558, 1998.

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