Voltage-controlled oscillator circuit including level shifter

Details Voltage-controlled oscillator circuit including level shifter Voltage-controlled oscillator circuit including level shifter

2011-06-21

2011-06-21

Kinkead, Arnold (Department: 2817)

Oscillators

Ring oscillators

C331S016000, C331S034000, C331S17700V, C331S185000

Reexamination Certificate

active

07965145

ABSTRACT:
A voltage-controlled oscillator (VCO) circuit includes a level shifter, and a semiconductor device includes the VCO circuit. The VCO circuit includes an input voltage receiver, a current mirror, and a frequency oscillator. The input voltage receiver receives a first voltage input to the VCO circuit so as to generate a first current. The current mirror copies the first current so as to generate a second current. The frequency oscillator oscillates in response to the second current. The input voltage receiver includes a level shifter and a first current generator. The level shifter shifts a voltage level of the first voltage to a voltage level of a second voltage. The first current generator generates the first current corresponding to the second voltage.

REFERENCES:
patent: 6278334 (2001-08-01), Schorn
patent: 6985040 (2006-01-01), Kim
patent: 9-223950 (1997-08-01), None
patent: 2005-184793 (2005-07-01), None

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