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F&H filter: a novel ultra-low power discrete time filter

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3 Author(s)
Grade Tavares, V.M. ; Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA ; Principe, J.C. ; Harris, J.G.

A new technique for designing filters with long time constants in the discrete time domain is presented. The F&H (filter and hold) methodology halts the state of a continuous time filter every T seconds resulting in a filter implementation with time constants that can be controlled in three distinct ways: by the sampling period T, the duty cycle k=τ/T or the time constant of the continuous time filter prototype. The final filter can be constructed from a typical Gm-C technique with very low power consumption

Published in:

Electronics Letters  (Volume:35 ,  Issue: 15 )