Browse Prior Art Database

Transistor Circuit

IP.com Disclosure Number: IPCOM000095435D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Proudman, A: AUTHOR

Abstract

The circuit has transistor T connected in a grounded emitter configuration. In the absence of an input signal, T is cut off by means of bias current flowing through resistor 1. In this condition, the current through resistor 2 is derived through resistors 3 and 4. Thus, potential V(x) is more negative than potential V(b) and diode 5 is cut off.

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 100% of the total text.

Page 1 of 2

Transistor Circuit

The circuit has transistor T connected in a grounded emitter configuration. In the absence of an input signal, T is cut off by means of bias current flowing through resistor 1. In this condition, the current through resistor 2 is derived through resistors 3 and 4. Thus, potential V(x) is more negative than potential V(b) and diode 5 is cut off.

Upon reception of a negative input signal at terminal 6, the bias current through resistor 1 is overcome. T conducts causing its collector to become more positive. The values of resistors 3 and 4 are arranged such that, at a chosen point of the V(b)/I(c) characteristic of T, V(x) becomes sufficiently positive to make diode 5 conduct. Then, if the input to terminal 6 increases to tend to drive Y harder into conduction, current feedback from the output terminal to the base is effective to keep T at the chosen point on its characteristic.

Resistor 3 can be replaced by silicon diode 7 connected as shown. This enables V(x) at which feedback occurs to be defined more accurately.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]