Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1996-10-23
1997-12-30
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327148, 327536, 327537, 331 17, H03L 7089
Patent
active
057035113
ABSTRACT:
A charge pump circuit has a first transistor connected to a first power source and having a control electrode to receive a first control signal; a second transistor connected to a second power source and having a control electrode to receive a second control signal; a third transistor and a current source connected in series between the first and second transistors, a node between the third transistor and the current source providing a signal, which is passed through a low-pass filter to provide a VCO input signal; and a control voltage generator for generating a control voltage according to the VCO input signal and applying the control voltage to a control electrode of the third transistor. This charge pump circuit realizes a stable PLL operation for a wide range of VCO input voltages, has little data rate dependency, and operates at high speed.
REFERENCES:
patent: 5208546 (1993-05-01), Nagaraj et al.
patent: 5422591 (1995-06-01), Rastegar et al.
patent: 5477193 (1995-12-01), Burchfield
patent: 5546031 (1996-08-01), Seesink
Callahan Timothy P.
Fujitsu Limited
Lam T. T.
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