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Differential Amplifier With Variable Clipping Levels

IP.com Disclosure Number: IPCOM000073950D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Kemerer, DW: AUTHOR

Abstract

The addition of transistors T1b and T2b limits the divergence of a signal at the outputs V OUT 1 and V OUT 2 of a differential amplifier. When an input signal is applied to the inputs V IN 1 and V IN 2 of this differential amplifier, one of the base-to-emitter diodes of transistors T1b or T2b conducts in the forward direction to limit the divergence of the voltage in the negative direction at the output V OUT 1 or V OUT 2 coupled to the collector of the transistor T1a or T2a driven hardest by the input signal. In addition, this diode in so conducting also draws current through its associated collector to limit the divergence of the voltage in the positive direction at the collector of the other transistor.

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Differential Amplifier With Variable Clipping Levels

The addition of transistors T1b and T2b limits the divergence of a signal at the outputs V OUT 1 and V OUT 2 of a differential amplifier. When an input signal is applied to the inputs V IN 1 and V IN 2 of this differential amplifier, one of the base-to-emitter diodes of transistors T1b or T2b conducts in the forward direction to limit the divergence of the voltage in the negative direction at the output V OUT 1 or V OUT 2 coupled to the collector of the transistor T1a or T2a driven hardest by the input signal. In addition, this diode in so conducting also draws current through its associated collector to limit the divergence of the voltage in the positive direction at the collector of the other transistor. Thus, this circuit provides limiting of the output signal in both the positive and negative directions in contrast to a two diode clamp which only provides limiting in one of the directions.

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