Amplification circuit, amplification circuit noise reducing...

Details Amplification circuit, amplification circuit noise reducing... Amplification circuit, amplification circuit noise reducing...

2011-01-18

2011-01-18

Mottola, Steven J (Department: 2817)

Amplifiers

Signal feedback

Phase shift means in loop path

C330S109000

Reexamination Certificate

active

07872524

ABSTRACT:
[Problems] to provide a CMOS low-noise amplification circuit which can reduce a chip area and design time, and which is easy to be digital-controlled from outside. [Means For Solving the Problems] The amplification circuit includes; an amplification stage (12) which amplifies an input signal up to an intended value; a sample and hold circuit (13) which samples the output signal from the amplification stage (12) by sampling the output signal with a sampling frequency which is at least twice the frequency band of the output signal to convert the output signal to a discrete time signal; a moving average calculation unit (15) which selects and outputs a particular frequency from the discrete time signal outputted from the sample and hold circuit (13) by a moving average operation; and a smoothing filter (17) which smoothes the output signal from the moving average calculation unit (15) and feed it back to the input of the amplification stage (12).

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International Search Report for PCT/JP2007/067792 mailed Dec. 18, 2007.
Jing-Hong Conan Zhan, et al. “A 5GHz Resistive-Feedback CMOS LNA for Low-Cost Multi-Standard Applications”, Proceedings of 2006 IEEE International Solid-State Circuits Conference, Session 11, Feb. 7, 2006.

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