Current mode group delay equalisation using pole-zero mirroring techniques

Al-Hashim, B.M., Dudek, F. and Moniri, M. (2000) Current mode group delay equalisation using pole-zero mirroring techniques. pp. 257-63 .

Record type: Conference or Workshop Item (Other)

Abstract

This paper describes a new efficient method for designing current mode group delay equaliers. The method is based on introducing zeros into the right-hand s-plane by mirroring the poles of an LC ladder network. This is achieved by developing a current mode model capable of implementing the pole-zero mirroring technique. Using MO-OTA and grounded capacitors, the model is used to derive an nth-order active group-delay equaliser structure which is simpler, has better correction accuracy and is less sensitive when compared to cascaded based equaliers. The equaliser design involves two optimisation algorithms. Simulated and measured results demonstrate that the equaliser can effectively compensate the delay characteristics of a 7th-order 5.75MHz lowpass elliptic video filter to < 5ns ripple over 90% of the filter passband.

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