High-performance charge-pump circuit for phase-locked loops

Details High-performance charge-pump circuit for phase-locked loops High-performance charge-pump circuit for phase-locked loops

2007-03-13

2007-03-13

Lee, Benny (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C327S157000, C327S536000

Reexamination Certificate

active

11104112

ABSTRACT:
One of the high-performance charge-pump circuits basically includes two switch mirror circuits, two current sources, two switches, and an inverter. In the switch mirror, the switch coupled to the diode-connected reference transistor is indirectly mirrored to the output. The great advantage is to utilize the switch mirrors as a part of building cascodes at the output. Consequently, all high-performance charge-pump circuits suppress any charge-injection errors, reduce charge-pump offset, increase the output impedance for effective current injection, and reduce chare-sharing problem.

REFERENCES:
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patent: 5357216 (1994-10-01), Nguyen
patent: 5473283 (1995-12-01), Luich
patent: 5625306 (1997-04-01), Tada
patent: 5818303 (1998-10-01), Oishi et al.
patent: 6329872 (2001-12-01), Foroudi
patent: 6586976 (2003-07-01), Yang
patent: 7071744 (2006-07-01), Kang et al.

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