Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Reexamination Certificate
2005-05-24
2005-05-24
Kinkead, Arnold (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
C331S008000, C331S025000, C327S157000
Reexamination Certificate
active
06897733
ABSTRACT:
A high precision charge pump used in a phase-lock-loop incorporating a phase/frequency detector is designed and constructed to substantially eliminate the effects of DC offset and glitch errors on the charge pump output current. The high precision charge pump is constructed of parallel current paths each having a central node which is, in turn, connected to a feedback element. The feedback element defines a feedback current which is applied to the charge pump so as to maintain the two central nodes at an equi-potential level and to maintain the value of the pump-down current exactly equal to the value of the pump-up current output by the device.
REFERENCES:
patent: 5508660 (1996-04-01), Gersbach et al.
patent: 5942949 (1999-08-01), Wilson et al.
patent: 6181210 (2001-01-01), Wakayama
patent: 6326852 (2001-12-01), Wakayama
Broadcom Corporation
Kinkead Arnold
Sterne Kessler Goldstein & Fox P.L.L.C.
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