Analog adaptive FIR filter having independent coefficient...

Details Analog adaptive FIR filter having independent coefficient... Analog adaptive FIR filter having independent coefficient...

2007-03-06

2007-03-06

Mai, Tan V. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical analog calculating computer

Particular function performed

C708S319000, C708S316000

Reexamination Certificate

active

10944470

ABSTRACT:
A finite impulse response filter having tap weight rotation is provided, where each tap has a corresponding coefficient selector. Each coefficient selector includes N coefficients, where N is the number of taps. Each coefficient selector provides one of its corresponding coefficients as an input to a multiplier. Each multiplier also receives an input from a triggered track and hold tap. The tap coefficients are selected according to the time delay since the corresponding track and hold tap was most recently triggered. In this manner, the tendency of multiplier gain nonuniformity to degrade filter operation in the presence of tap weight rotation is reduced. In another embodiment, an offset selector is provided, to reduce the tendency of component offsets to degrade filter operation in the presence of tap weight rotation.

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Michael Q. Le et al., “An Adaptive Analog Noise-Predictive Decision-Feedback Equalizer,” IEEE Journal of Solid-State Circuits, vol. 37, No. 2, Feb. 2002, pp. 105-113.
Xiaodong Wang, “A Low-Power 170-MHz Discrete-Time Analog FIR Filter,” IEEE Journal of Solid-State Circuits, vol. 33, No. 3, Mar. 1998, pp. 417-426.

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