Voltage-controlled oscillator with gain proportional to...

Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control

Reexamination Certificate

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C331S034000, C331S17700V

Reexamination Certificate

active

07116178

ABSTRACT:
Embodiments of the invention include a voltage-controlled oscillator (VCO) circuit in which the gain of the VCO is proportional to the output or operating frequency of the VCO. The VCO circuit includes a voltage-controlled oscillator, a current scaling block, and a summing node. The summing node couples a VCO control current and a VCO reference current into the current scaling block. The current scaling block scales the sum of the currents by a scaling factor. The output of the current scaling block, which is coupled to the input of the VCO, provides a bias current to the VCO, which bias current adjusts the oscillation frequency of the oscillator. The VCO control current and the VCO reference current are scaled by the same scaling factor, thus allowing the gain of the VCO to be proportional to but not dependent on the output frequency of the VCO.

REFERENCES:
patent: 5708396 (1998-01-01), Mizuno
patent: 5786733 (1998-07-01), Yamaguchi
patent: 5787134 (1998-07-01), Kovacs
patent: 6114820 (2000-09-01), Nishigaya
patent: 6552618 (2003-04-01), Nelson et al.

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