Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2007-02-20
2007-02-20
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S148000
Reexamination Certificate
active
11211773
ABSTRACT:
The invention includes a phase locked loop which has a voltage-controlled oscillator, a phase comparator and a charge pump. The charge pump is coupled to a setting input of the voltage-controlled oscillator via a loop filter. A feedback input of the phase comparator is connected to the output of the voltage-controlled oscillator via a frequency divider, and the phase comparator is designed to output an actuating signal to the charge pump. The loop filter has a first charge store and at least one tunable element that alters a filter characteristic of the loop filter. In addition, there is a trimming circuit which is coupled to the at least one further element in order to alter the filter characteristic of the loop filter and which is designed to compare a time period for a charging operation in a loop filter with a reference time period.
REFERENCES:
patent: 4829258 (1989-05-01), Volk et al.
patent: 4908841 (1990-03-01), Leis et al.
patent: 5056118 (1991-10-01), Sun
patent: 5384502 (1995-01-01), Volk
patent: 5694088 (1997-12-01), Dickson
patent: 5877657 (1999-03-01), Yoshinaka
patent: 6731145 (2004-05-01), Humphreys et al.
patent: 7084709 (2006-08-01), Leong et al.
patent: 7095287 (2006-08-01), Maxim et al.
patent: 2002/0080901 (2002-06-01), Ham, III
patent: 2002/0196060 (2002-12-01), Ichimaru
patent: 2003/0190005 (2003-10-01), Amick et al.
patent: 2003/0214330 (2003-11-01), Tanigashira et al.
patent: 2004/0036539 (2004-02-01), Hammes et al.
patent: 2005/0046452 (2005-03-01), Briones
patent: WO 03/100979 (2003-12-01), None
“Phase-Locked Loops for High-Frequency Receivers and Transmitters-Part 2”, Mike Curtin, and Paul O'Brien, Analog Dialogue 33-5, Analog Devices 1999, pp. 1-5.
“Advanced Electronic Circuits” U. Tietze and Ch. Schenk, Based on Halbleiter-Schaltungstechnik, U. Tietze and Ch. Schenk, Springer, 1978, 4 pgs.
Märzinger Günter
Mayer Thomas
Schelmbauer Werner
Callahan Timothy P.
Cox Cassandra
Eschweiler & Associates LLC
Infineon - Technologies AG
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