Polyphase filter having a tunable notch for image rejection

Details Polyphase filter having a tunable notch for image rejection Polyphase filter having a tunable notch for image rejection

2011-07-19

2011-07-19

Ngo, Chuong D (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical analog calculating computer

Particular function performed

Reexamination Certificate

active

07984093

ABSTRACT:
A polyphase filter comprises an impedance network. The polyphase filter also comprises a first differential amplifier that includes first inverting and non-inverting inputs and first inverting and non-inverting outputs. The first inverting and non-inverting inputs communicate through the impedance network with a first phase and a shifted first phase of an input signal, respectively. A second differential amplifier of the polyphase filter includes second inverting and non-inverting inputs and second inverting and non-inverting outputs. The second inverting and non-inverting inputs communicate with a second phase and a shifted second phase of the input signal, respectively, through the impedance network. The second phase is offset from the first phase.

REFERENCES:
patent: 6417737 (2002-07-01), Moloudi et al.
patent: 6441682 (2002-08-01), Vinn et al.
patent: 7139547 (2006-11-01), Wakayama et al.
patent: 2005/0101281 (2005-05-01), Schelmbauer
patent: 1174710 (1969-12-01), None
Farbod Behbahani, et al; “CMOS Mixers and Polyphase Filters for Large Image Rejection”; IEEE Journal of Solid-State Circuits, vol. 36, No. 6, Jun. 2001; pp. 873-887.

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