Voltage controlled oscillator with varactor-less tuning

Details Voltage controlled oscillator with varactor-less tuning Voltage controlled oscillator with varactor-less tuning

2006-11-07

2006-11-07

Chang, Joseph (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S1170FE, C331S17700V

Reexamination Certificate

active

07132901

ABSTRACT:
According to an exemplary embodiment, a voltage controlled oscillator includes a PFET having a first gate terminal, a first source terminal, a first drain terminal, and a first body terminal, where the first source terminal is coupled to a bias voltage and the first body terminal is coupled to a first tuning voltage. The voltage controlled oscillator does not include a discrete varactor diode. The voltage controlled oscillator further includes an NFET having a second gate terminal, a second source terminal, a second drain terminal, and a second body terminal, where the second body terminal is coupled to a second tuning voltage. The first and second drain terminals drive an output of the voltage controlled oscillator, where a frequency of the output is responsive to a change in the first tuning voltage. The change in the first tuning voltage causes a change in source-to-body capacitance of the PFET.

REFERENCES:
patent: 6784753 (2004-08-01), Leenaerts et al.
patent: 6859109 (2005-02-01), Leung et al.
patent: 2005/0212610 (2005-09-01), Brekelmans

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