Browse Prior Art Database

RF Amplifier

IP.com Disclosure Number: IPCOM000086685D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Debord, P: AUTHOR

Abstract

This is an RF push-pull amplifier which does not require the use of any PNP transistor and permits the use of low-voltage power supplies.

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

RF Amplifier

This is an RF push-pull amplifier which does not require the use of any PNP transistor and permits the use of low-voltage power supplies.

Its input stage is provided with a conventional unbalanced differential amplifier (T(10), T(11) and T(12)) and an oscillation compensating circuit. It differs from the other circuits in the push-pull control.

The differential amplifier (T(10) and T(11)) drives in parallel two emitter followers T(8) and T(88). Transistor T(7) is used as a current source, and resistor R(1) provides the necessary voltage translation to drive output transistor T(2). Transistor T(5) needs an out-of-phase base control. This is obtained through the inverter T(6)-R(22). T(6) is driven by the voltage translator R(11), R(111) and T(77) used as a current source.

The linearization of output stage operation is obtained by: (1) A constant quiescent current provided through T(5) by T(13). (2) The clamping through T to avoid any saturation of T(6).

The feedback loop is closed through resistor R(5).

1

Page 2 of 2

2

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