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Transistor Differential Amplifier

IP.com Disclosure Number: IPCOM000096622D
Original Publication Date: 1963-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Norton, DE: AUTHOR

Abstract

The transistor differential amplifier has a transistor T1 connected to receive a first input signal from terminal 1 at its base and a second input signal from terminal 2 at its emitter. Due to the collector to base capacitance Cob, common mode signals are applied to the output since this capacitor provides direct coupling between input terminal 1 and the output.

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Transistor Differential Amplifier

The transistor differential amplifier has a transistor T1 connected to receive a first input signal from terminal 1 at its base and a second input signal from terminal 2 at its emitter. Due to the collector to base capacitance Cob, common mode signals are applied to the output since this capacitor provides direct coupling between input terminal 1 and the output.

This common mode output is rejected by coupling the other input to ground by capacitor C1. The value of C1 bears the following relationship to the collector to base capacitance Cob. C1/Cob=(2+hIB/R)/ alpha where R = R(o)R(b)/ (R(o) + R(b)) R(o) = characteristic impedance of the input lines hIB = grounded base (emitter) input impedance alpha = the alpha of the transistor

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