Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Reexamination Certificate
2008-03-06
2010-11-30
Cho, James H. (Department: 2819)
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
C326S021000, C326S027000
Reexamination Certificate
active
07843212
ABSTRACT:
The present invention provides a precisely controlled terminator circuit of a differential amplifier, in particular, for a differential amplifier of an optical receiver. The differential circuit, which receives a differential signal by a first input for the normal phase signal and a second input for an anti-phase signal, provides a terminator circuit comprises two resistors connected in serial between two inputs and two resistive connections each including a transistor and a resistor serially connected to the transistor and connected between respective inputs and the power supply line Vcc. The control unit, by receiving a medium potential of two resistors, provides a bias to two transistors so as to equalize the medium potential with the reference potential.
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Cho James H.
Crawford Jason
Smith , Gambrell & Russell, LLP
Sumitomo Electric Industries Ltd.
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