Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-03-05
2000-07-18
Kim, Jung Ho
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327156, 327102, H01J 1982
Patent
active
060912812
ABSTRACT:
A reference voltage generator includes a voltage controlled oscillator which has fixed and accurate relationship between a frequency of an oscillation signal and a voltage supplied thereto, a reference frequency oscillator for generating a reference frequency signal of high accuracy and stability, a phase comparator for detecting a phase difference between the oscillation signal of the voltage controlled oscillator and the reference frequency signal, a low pass filter for smoothing a detection signal from the phase comparator, a gain adjust circuit for amplifying a signal from the low pass filter, a voltage adder for providing a sum of voltages from the gain adjust circuit and an offset voltage to the voltage controlled oscillator, and a phase clock loop formed by the phase comparator, low pass filter, gain adjust circuit and voltage adder to null the phase difference by regulating a control voltage applied to the voltage controlled oscillator.
REFERENCES:
patent: 5038115 (1991-08-01), Myers et al.
patent: 5075639 (1991-12-01), Taya
patent: 5479136 (1995-12-01), Endo et al.
patent: 5646562 (1997-07-01), Abe
patent: 5905759 (1999-05-01), Ishida et al.
Advantest Corp.
Kim Jung Ho
LandOfFree
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