Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-06-16
2000-06-13
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327589, 307110, G05F 110
Patent
active
060754060
ABSTRACT:
A portion of a differential charge pump circuit is partially replicated and is utilized as a replica circuit to define the common-mode voltage VCM of the differential output voltages of the charge pump circuit that drives a voltage controlled oscillator (VCO) in a PLL system application, or a voltage-controlled delay (VCD) circuit in a DLL system application. The replica circuit includes a high gain operational amplifier and at least three MOS transistors electrically coupled to the differential charge pump circuit. The operational amplifier generates the DC output voltage VO which is used to define the common-mode voltage VCM of the charge pump circuit. The three transistors are configured in replica of one-half of the charge pump circuit. The operational amplifier is provided with a bias voltage at the inverting-end input terminal. During operation, the high gain of the operational amplifier forces the non-inverting end of the operational amplifier to the same value as the bias voltage supplied to the inverting-end input. This voltage equalization effect is referred to as the replica effect. As a result of the replica effect, the charge pump's DC output voltages OUTP and OUTN follow the voltage at non-inverting end of the operational amplifier which results in stable operation of the differential charge pump and a control circuit which is suitable for high-frequency (greater than 400 MHz) application of phase-locked loop (PLL) and delay-locked loop (DLL) systems applications.
REFERENCES:
patent: 5239455 (1993-08-01), Fobbester et al.
patent: 5619161 (1997-04-01), Novof et al.
patent: 5694072 (1997-12-01), Hsiao et al.
patent: 5705947 (1998-01-01), Jeong
patent: 5781048 (1998-07-01), Nakao et al.
patent: 5831484 (1998-11-01), Lukes et al.
Lee Yeong-Sheng
Sun Young-Jen
Callahan Timothy P.
Luu An T.
Macronix International Ltd.
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