Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1999-03-09
1992-09-29
Peng, John K.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 30, 358 16, H04N 964
Patent
active
051517809
ABSTRACT:
A differential amplifier includes two transistors T1 and T2 having their collectors connected through respective loads R1 and R2 to one supply line VL1, their emitters connected together and to a controllable constant current source IB which supplies a bias current Ib and which is connected between the common connection of the emitters and a return supply line VL2. The transistor bases are connected to receive a control voltage Vc. The common connection of the emitters is also connected through a by-pass resistance RB to a bias voltage source +VB. The circuit parameters are such that flow of bias current Ib will result in a small current Ir being diverted through the by-pass resistance RB instead of flowing through the transistors. This small current approximates in value to the value of any residual bias current when the curent source IB is switched off, but has a value which is negligible relative to the value of the bias current when the current source IB is switched on.
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Goodman Edward W.
Oh Minsun
Peng John K.
U.S. Philips Corporation
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