Browse Prior Art Database

Directly Coupled AC Amplifier

IP.com Disclosure Number: IPCOM000091059D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Luetze, W: AUTHOR

Abstract

This directly coupled AC amplifier has DC current suppression for input signals. Outputs of a first differential amplifier, serving as a signal amplifier, are linked with a second differential amplifier acting as a variable gain amplifier. Outputs of the Second differential amplifier are connected to inputs of the first so that DC current components are compensated. The differential amplifier, serving as a signal amplifier nd consisting of transistors Tl1 T2 and T3, T4, has inputs 1, 2 and outputs 3,4. The differential amplifier, acting as a variable gain amplifier and incorporation transistors T5, T6 and T7, T8, is provided with inputs 5,6 and outputs 7,8.

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

Directly Coupled AC Amplifier

This directly coupled AC amplifier has DC current suppression for input signals. Outputs of a first differential amplifier, serving as a signal amplifier, are linked with a second differential amplifier acting as a variable gain amplifier. Outputs of the Second differential amplifier are connected to inputs of the first so that DC current components are compensated. The differential amplifier, serving as a signal amplifier nd consisting of transistors Tl1 T2 and T3, T4, has inputs 1, 2 and outputs 3,4. The differential amplifier, acting as a variable gain amplifier and incorporation transistors T5, T6 and T7, T8, is provided with inputs 5,6 and outputs 7,8. A DC signal, applied to inputs 1,2 of the signal amplifier, is first amplified, with the signal amplifier trying to emit the correspondingly amplified signal on its outputs 3,4. This DC signal is also fed to inputs 5,6 of the variable gain amplifier. The latter also amplifies the DC current signal and applies it through outputs 7,8 to inputs 1,2 of the signal amplifier.

Thus the latter is reset to its original state. The DC signal, fed to inputs 1,2 or outputs 3,4, is compensated.

1

Page 2 of 2

2

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