Appeal No. 1998-2710
Application 08/582,045
The invention is directed to a phase detector comprising
a load circuit, a capacitive circuit, a first circuit, and a
second circuit. The load circuit of the phase detector is
formed by transistors and coupled with a power supply, a first
node and a second node. The first node and the second node
form an output of the phase detector. In operation, each of
the first and second circuits of the phase detector receives
the first and second signals, and the first and second
circuits are controlled by the second signal to function with
respect to the first and second signals at the same time such
that the second error current cancels the first error current.
This results in the first circuit detecting the phase
difference between the first and second signals with minimized
detection error. The invention is further illustrated by the
following claim.
1. A phase detector, comprising:
(A) a load circuit formed by transistors and coupled to
(1) a power supply and (2) a first node and a second node,
wherein the first and second nodes form an output of the phase
detector;
(B) a capacitive circuit having (1) a first capacitor
coupled to the first node and ground and (2) a second
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