Abstract
This paper shows that the group delay of a delay circuit does not give sufficient information to predict the delay vs. frequency. A new criterion (f ϕ=0 ) is proposed that characterizes the delay variations over a specified frequency range. The mathematical derivation of f ϕ=0 for a single delay block and a cascade of delay blocks is shown. As examples the criterion is applied to the design of an RC and LC delay block. Delay predictions based on f ϕ=0 compared with simulation results, showing reasonable agreement.
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