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Low Voltage Clipping Circuit

IP.com Disclosure Number: IPCOM000090313D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Wiedmann, SK: AUTHOR

Abstract

For voltage clipping, a component with nonlinear resistance characteristic is required. Many clipping circuits make use of the nonlinear diode characteristic. These circuits, however, can only be used if the desired clipped voltage level is equal to or higher than the threshold voltage of a forward-biased diode VT, e.g., silicon 0.7V. The clipping circuit A with its characteristic B allows clipping of voltages to a value V1 < VT within the current range 0>1, thus IH approx. ID + I/beta 1 is obtained.

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Low Voltage Clipping Circuit

For voltage clipping, a component with nonlinear resistance characteristic is required. Many clipping circuits make use of the nonlinear diode characteristic. These circuits, however, can only be used if the desired clipped voltage level is equal to or higher than the threshold voltage of a forward-biased diode VT, e.g., silicon 0.7V. The clipping circuit A with its characteristic B allows clipping of voltages to a value V1 < VT within the current range 0</-I</-beta 1 . IH where beta 1 = beta of transistor T1. Only a low impressed auxiliary current IH is required. Since transistor T2 is only slightly saturated, IB2<<IH. As T1 is also only slightly saturated, so that IB 1 = (ID+I)/beta 1 and, with IB 1 = IH - ID and beta 1>>1, thus IH approx. ID + I/beta 1 is obtained.

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