PLL circuit and wireless mobile station with that PLL circuit

Details PLL circuit and wireless mobile station with that PLL circuit PLL circuit and wireless mobile station with that PLL circuit

2005-06-28

2005-06-28

Trinh, Sonny (Department: 2687)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S084000, C455S246100, C327S156000, C327S157000, C327S158000

Reexamination Certificate

active

06912380

ABSTRACT:
In a PLL circuit, and a wireless mobile station with that PLL circuit, an LPF charging constant current source, a discharging constant current source and a high-speed charging constant current source are connected to an output terminal of a phase comparator with current mode output. When a convergence frequency of the PLL circuit is low, an input voltage of a VCO is increased from OV so as to be converged by using the constant current source. However, when the convergence frequency of the PLL circuit is high, the input voltage of the PLL circuit is temporarily increased to the maximum voltage by using the constant current source. Thereafter, the input voltage is gradually dropped from the maximum voltage so as to be converged by using the constant current source.

REFERENCES:
patent: 4115745 (1978-09-01), Egan
patent: 4459561 (1984-07-01), Clark et al.
patent: 4862106 (1989-08-01), Toda et al.
patent: 4890072 (1989-12-01), Espe et al.
patent: 5208546 (1993-05-01), Nagaraj et al.
patent: 5220294 (1993-06-01), Ichikawa
patent: 5686866 (1997-11-01), Badger
patent: 5758274 (1998-05-01), Vu et al.
patent: 6150890 (2000-11-01), Damgaard et al.
patent: 6163585 (2000-12-01), Yamawaki et al.
patent: 6215362 (2001-04-01), Feng et al.
patent: 6249685 (2001-06-01), Sharaf et al.
patent: 6441690 (2002-08-01), Savelli et al.
patent: 6466067 (2002-10-01), Matsui
patent: 6677824 (2004-01-01), Harpham
patent: 4342344 (1995-06-01), None
patent: 0326940 (1989-08-01), None
patent: 0856946 (1998-08-01), None
patent: 2338127 (1999-12-01), None
IEEE Journal of Solid-Stare Circuits, vol. 32, No. 12, “A 2.7-V GSM RF Transceiver IC”, pp. 2089-2096.
Yamawaki et al, “A 2.7-V GSM RF Transceiver IC”, IEEE Journal of Solid-State Circuits, vol. 32, No. 12, Dec. 1, 1997, pp. 2089-2096.

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