Low-voltage frequency synthesizer

Details Low-voltage frequency synthesizer Low-voltage frequency synthesizer

1996-09-12

1998-11-17

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327105, 331 17, H03L 7099, H03B 504

Patent

active

058381805

ABSTRACT:
An improved control voltage generator for use with a voltage-controlled oscillator (VCO), so as to enable VCO operation at low supply voltages of less than three volts. The control voltage generator includes a phase comparator, a charge pump, a switched voltage multiplier, and a control voltage filter. The output voltage of the phase detector is coupled to a sampling terminal of the charge pump, a power supply terminal of the charge pump is coupled to an output terminal of the switched voltage multiplier, and a voltage input terminal of the switched voltage multiplier is coupled to a first, reference signal. The charge pump, powered from the power supply terminal, generates a waveform including a plurality of pulses. Each of the plurality of pulses has a time duration substantially proportional to the voltage present at the sampling terminal. These pulses may be used as a VCO control voltage or, alternatively, a control voltage filter, coupled to the charge pump, may be used to transform the pulses into a VCO control voltage having desired characteristics.

REFERENCES:
patent: 5168245 (1992-12-01), Koskowich
patent: 5315270 (1994-05-01), Leonowich
patent: 5469120 (1995-11-01), Nguyen et al.

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