Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1996-06-05
1999-07-27
Le, Dinh
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327156, 327147, 327148, 331 17, H03K 513, H03K 500
Patent
active
059296771
ABSTRACT:
A phase locked loop having a charging pump circuit portion for generating a phase difference output voltage between an input signal and an oscillation output signal, and a semiconductor device including such a phase locked loop, are constituted so that the phase difference output signal from the charging pump circuit portion is inputted to a voltage controlled oscillator through a low-pass filter, and an oscillation frequency of the oscillation output signal from the voltage controlled oscillator is brought into conformity with a frequency of the input signal, and they further include voltage source means which is connected to a phase difference output terminal of the charging pump circuit portion during each period in which the phase difference output terminal of the charging pump circuit portion is in a non-conductive state, and supplies a voltage having a potential substantially equal to the potential of the low-pass filter on the output side thereof.
REFERENCES:
patent: 4885554 (1989-12-01), Wimmer
patent: 5170130 (1992-12-01), Ichihara
patent: 5475326 (1995-12-01), Masuda
Fujitsu Limited
Le Dinh
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