Browse Prior Art Database

TRANSISTOR CLAMP

IP.com Disclosure Number: IPCOM000006036D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2001-Nov-28
Document File: 2 page(s) / 69K

Publishing Venue

Motorola

Related People

Authors:
David Moore Graham Bell

Abstract

The RFPA is the next generation Power Amplifier for the Motorola GSM Base Station Infrastructure. The following design of Transistor Clamp solves a number of initial problems during development, namely: -to produce mechanical support for a printed circuit board at right angles to the mounting face; - to transfer the thermal output of a number of TO.220 style transistors to a heatsink (up to 30 Watts maximum); - to insulate each transistor; - to operate without degradation in temperatures in excess of 100 degrees C; - to provide constraint to cableforms to prevent trapping; -to be manufacturable within the constraints of reflow solder techniques; -to reduce the parts count and improve assembly time.