Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation
Reexamination Certificate
2007-01-09
2007-01-09
Pascal, Robert (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Tuning compensation
C331S182000, C331S183000, C331S017000, C331S00100A
Reexamination Certificate
active
11061528
ABSTRACT:
The output amplitude of a variable gain amplifier is compared with a reference value by a differential amplifier. When the amplitude is less than the reference value, the gain of the variable gain amplifier is increased to augment the output amplitude. When the amplitude is greater than the reference value, the gain of the variable gain amplifier is decreased to reduce the output amplitude. Only part of the variable gain range of the variable gain amplifier is corresponded to the potential at VLP by installing an input switching unit for inverting the output polarity of the differential amplifier, an input switching unit for inverting the output polarity of a differential amplifier, comparator, an IDAC, and a logic circuit for controlling the ON and OFF of switches of the input switching units and the output current value of the IDAC.
REFERENCES:
patent: 6163186 (2000-12-01), Kurita
Kurosu, Shigeru, “Introduction to Control Engineering,” pp. 77-86, 2ndEdition, POWERSHA Inc., May 30, 1994.
Green, Douglas N., “Global Stability Analysis of Automatic Gain Control Circuits,” IEEE Transactions on Circuits and Systems, vol. CAS-30, No. 2, Feb. 1983, pp. 78-83.
Larsson, Patrjk, “Measurements and Analysis of PLL Jitter Caused by Digital Switching Noise,” IEEE Journal of Solid-State Circuits, vol. 36, No. 7, Jul. 2001, pp. 1113-1119.
Asahi Kasei Microsystems Co. Ltd.
Finnegan Henderson Farabow Garrett & Dunner LLP
Gannon Levi
Pascal Robert
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