CMOS voltage-controlled oscillator (VCO) with a...

Details CMOS voltage-controlled oscillator (VCO) with a... CMOS voltage-controlled oscillator (VCO) with a...

2006-03-21

2006-03-21

Mis, David (Department: 2817)

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

C331S057000, C331S185000, C331S186000

Reexamination Certificate

active

07015766

ABSTRACT:
A voltage-controlled oscillator (VCO) for a phase-locked loop (PLL) has improved bandwidth and performance at lower frequency. A variable current source supplies a current to an internal oscillator-power node. The current varies with the VCO input voltage. The internal oscillator-power node drives the sources of p-channel transistors in inverter stages in the ring oscillator. The variable current causes the internal oscillator-power node's voltage to vary, which varies the output frequency. An active resistor is in parallel with the ring oscillator. The active resistor has a resistor and an n-channel transistor in series between the oscillator-power node and ground. The n-channel transistor has a fixed bias voltage on its gate and is non-linear. The non-linear effective resistance of the n-channel transistor improves overall linearity of the ring oscillator. The parallel effective resistance of the active resistor lowers overall effective resistance of the ring oscillator. Oscillator bandwidth at lower frequencies improves.

REFERENCES:
patent: 4531155 (1985-07-01), Hasegawa
patent: 5418497 (1995-05-01), Martin
patent: 5544120 (1996-08-01), Kuwagata et al.
patent: 5767748 (1998-06-01), Nakao
patent: 6281727 (2001-08-01), Hattori
patent: 6424585 (2002-07-01), Ooishi
patent: 6469585 (2002-10-01), Dai et al.
patent: 6525613 (2003-02-01), Cyrusian
patent: 6535071 (2003-03-01), Forbes

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