Circuit with Q-enhancement cell having feedback loop

Details Circuit with Q-enhancement cell having feedback loop Circuit with Q-enhancement cell having feedback loop

2008-07-15

2008-07-15

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

C330S260000, C330S261000

Reexamination Certificate

active

11590452

ABSTRACT:
According to an example embodiment, an amplitude feedback loop may include an RF amplifier, a detector, a comparator, and a Q-enhancement cell. In an example embodiment, the RF amplifier has an output signal, and the detector has an input coupled to the output signal of the RF amplifier and is configured to detect a level of the output signal of the RF amplifier. The comparator circuit may receive as inputs a reference voltage and the output of the detector. Also, the comparator circuit is configured to output a control signal based on a difference between the reference voltage and the output signal of the power detector. The Q-enhancement cell may be coupled to the RF amplifier and have an input coupled to an output of the comparator circuit. A bias current of the Q-enhancement cell may be adjusted based on the control signal output by the comparator circuit.

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Kulyk, Jim M., “A Monolithic CMOS Transformer Based Q-Enhanced Series-C Coupled Resonator Bandpass Filter”,The University of Calgary,Calgary, Alberta. A Thesis Submitted to the Faculty of Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Master of Science, Department of Electrical and Computer Engineering, (Jan. 2006), 150.

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