The attached schematic depicts the logic circuitry for the revised phase
comparator
Each of the 2 phase outputs is low pass filtered and buffered by an opamp.
Specifications:
Max input frequency 20MHz
2 quadrature phase outputs.
nonlinearity < 5nS at either end of range.
Input voltage (at comparator input stages) 10mV - 3Vrms.
For an input frequency of 10MHz
range is -200ns to + 200ns
Are the specs adequate or is there a real need to push the cost and
performance envelope to 500MHz or even 1GHz by using ECL parts.
Bruce.
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