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Realisation of switched capacitor delay lines, both for one-way and two-way signal sample propagation are presented. Finite impulse response (FIR) filters can be constructed using tapped delay lines; particularly, the discussed two-way delay lines are useful for the realisation of filters with antisymmetric impulse responses, such as Hilbert transformers. The switches can be controlled using two-phase clocks.
Date of Publication: 4 July 1991