Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2008-07-01
2009-11-17
Le, Don P (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C345S204000
Reexamination Certificate
active
07619445
ABSTRACT:
A differential amplifier includes a first differential pair, a second differential pair, a load circuit, connected in common to the first and second differential pairs, and first and second current sources for supplying the current to the first and second differential pairs, and amplifies a signal responsive to a common output signal of the first and second differential pairs. One of differential inputs of the first differential pair is connected to a reference voltage. A data output period includes a first period and a second period. During the first period, voltages of first and second input terminals are input through first and fourth switches in the on-state to differential inputs of the second differential pair. The other of the differential inputs of the first differential pair is connected through a third switch in the on-state to an output terminal. An output voltage is stored in a capacitor C connected to the other differential input of the first differential pair. The first, third and fourth switches are turned off during the second period. One of the differential inputs of the second differential pair is connected through a second switch to the output terminal. The other differential input of the second differential pair is connected through a fifth switch to a third input terminal.
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Le Don P
NEC Corporation
Scully , Scott, Murphy & Presser, P.C.
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