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Browse Prior Art Database

Fast Switching Inverter

IP.com Disclosure Number: IPCOM000098514D
Original Publication Date: 1960-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Trampel, KM: AUTHOR

Abstract

The circuit accepts a signal on input 1 and provides the inversion of this signal on output 3. It is capable of switching a large current output at a rapid rate.

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Fast Switching Inverter

The circuit accepts a signal on input 1 and provides the inversion of this signal on output 3. It is capable of switching a large current output at a rapid rate.

A negative signal applied to 1 causes transistor 4 to cut off. By making resistor 5 large in value, the amount of collector current conducted by 4 is made relatively small causing rapid cutoff. The current passing through 5 remains relatively constant since the voltage change across 5 is relatively small. When 4 cuts off, the collector current switches to the base of 7 causing it to conduct.

The amount of current going into the collector of 4 is relatively small for a collector current. However, the amount of current when switched to the base of 7 is relatively large for a base current causing 7 to conduct rapidly. The output voltage on terminal 3 approaches the zero potential of ground 8.

When the input voltage on 1 becomes positive, transistor 4 turns on rapidly since it is only switching a small collector current through resistor 5. The voltage at point 2 approaches the negative voltage source on terminal 10, causing transistor 9 to conduct and 7 to cut off. The voltage on output 3 approaches the potential of the negative voltage source on terminal 11, thus setting the lower level of the output voltage. The waveforms represent the voltage level at the terminal 1, point 2 and terminal 3, respectively.

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