Text preview for : a-118.pdf part of HP a-118 HP Publikacje a-118.pdf
Back to : a-118.pdf | Home
LOAD PULL-
MEASUREMENT
OF
LOAD IMPEDANCE
OF
HIGH POWER DEVICES
DENNIS POULIN
NETWORK MEASUREMENTS DIVISION
1400 I=OUNTAIN GROVE PARKWAY
SANTA ROSA, CALIFORNIA 95404
Flin- HEWLETT
~~ PACKARD
www.HPARCHIVE.com
INTRODUCTION
Most microwave designers are familiar
with the use of S parameters for design
of small signal amplifiers. However, small
signal S parameters are useless when a
designer is concerned about designing
or troubleshooting an oscillator, large
signal amplifier or an amplifier operating
REAL TIME in a mode other than Class A. In these
circumstances, it is necessary to measure
MANUAL LOAD PULL the load impedance required under the
actual operating conditions. This type
MEASUREMENT SYSTEM of measurement has classically been
referred to as a "load pull" measurement.
This paper describes a simple system to