Feedback control circuit

Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation

Reexamination Certificate

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Details

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.

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