30. A system for measuring jitter of an input signal, comprising:
a relative phase encoder, the relative phase encoder including a delay chain and flip-flops, the delay chain having a plurality
of tap nodes, the plurality of tap nodes respectively connected to flip-flop delay inputs of the flip-flops for sampling the
input signal to the delay chain, the relative phase encoder configured to receive a clock signal to first flip-flop clock
inputs of the flip-flops, the relative phase encoder having an encoder respectively coupled to flip-flop outputs of the flip-flops
and configured to provide encoded phase of the input signal relative to the clock signal responsive to the flip-flop outputs;
and
a data compare circuit coupled to receive the encoded phase and configured to compare the encoded phase with a stored reference
sample.
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