Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Voltage Comparator

IP.com Disclosure Number: IPCOM000097265D
Original Publication Date: 1962-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Verdibello, AA: AUTHOR

Abstract

This symmetrical voltage comparator has bistability, regeneration and high speed nonsaturating transistor action. The circuit has transistors T1 and T2 arranged in a complementary inverter manner to provide an output about a reference voltage determined by resistor R0. Transistors T3 and T4 are connected as common base amplifiers between the circuit input and transistors T2 and T1, respectively. They also connect in a feedback path from the circuit output to provide regeneration.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 92% of the total text.

Page 1 of 2

Voltage Comparator

This symmetrical voltage comparator has bistability, regeneration and high speed nonsaturating transistor action. The circuit has transistors T1 and T2 arranged in a complementary inverter manner to provide an output about a reference voltage determined by resistor R0. Transistors T3 and T4 are connected as common base amplifiers between the circuit input and transistors T2 and T1, respectively. They also connect in a feedback path from the circuit output to provide regeneration.

In one state of operation, transistors T1 and T4 are on, T2 and T3 are off and the input signal is at ground level. The output level is at a positive potential determined by the value of R0 and the current source of T1. This is also the reference voltage. During this aspect of operation a negative going pulse or signal level has no effect on the circuit. If a positive pulse or signal level exceeding the reference voltage is applied to the circuit, T4 and T1 turn off and, simultaneously, T3 and T2 turn on. Current flow in RO is reversed initiating the regenerative action. Switching of the transistors occurs and a new reference voltage in the negative direction is obtained. This is the second stable state of operation.

The circuit is variably controlled by the resistor R0 and the current sources for T1 and T2. The reference voltage is changed symmetrically or asymmetrically by changing one of these components so that when the reference voltage is exceeded by a positive o...