HOT S22

OPERATIONS, MEASUREMENT

5-11HOT S22

The output match of a power amplifier under excited conditions is critical

 

information that has a strong bearing on efficiency, output power, stabil-

 

ity, and often the economic viability of the design. One way of dealing

 

with this information—primarily in power devices operating well away

 

from compression or in somewhat matched amplifiers— is a quasi-linear

 

measurement of S22 while the amplifier is operating under normal drive.

 

Such a measurement is termed hot S22, and it can provide (1) some infor-

 

mation on the degree of mismatch in the system, (2) potential operational

 

stability, and (3) the effects of the amplifier’s performance on subsequent

 

stages or an antenna. In the PATS, the Hot S22 measurement uses one

 

source (Source 2) to provide stimulus to the amplifier-under-test (AUT)

 

input port while the other source (Source 1) provides a pilot tone injected

 

to the output of the AUT for measuring S22 at the AUT output port.

 

Procedure

 

 

Prepare the ME7840A as shown in Chapter 3.

 

 

Enter the appropriate test values in the displayed

 

 

 

 

User Input screen. The input fields are described

 

 

below:

 

 

￿ S Parameter: Already set to “Hot S22” for test –

 

 

input disabled.

 

 

￿ Data Points: Drop down options ￿ number of data

 

 

points in frequency sweep.

 

 

￿ Frequency 1 (MHz): Lower frequency to be dis-

 

 

played. Typically set to a value less than or equal

 

 

to the main tone. Can be reset using slider control.

 

 

￿ Frequency 2 (MHz): Upper Frequency to be dis-

 

 

played. Set to a value less than the system’s maxi-

 

 

mum frequency (for example, for MS4623C set to a

 

 

max of 5000 MHz). Can be reset using slider con-

 

 

trol.

 

 

￿ Src 1 Power (dBm):Source 1 power level, in dBm.

 

 

￿ IF Bandwidth (Hz):Intermediate frequency

 

 

 

 

value, in Hertz.

5-32

ME 7840A OMM

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Anritsu ME7840A manual HOT S22 OPERATIONS, Measurement, 11HOT S22

ME7840A specifications

The Anritsu ME7840A is an advanced test solution designed for characterizing and verifying the performance of wireless devices. With the rapid evolution of communication technologies, specifically in the realms of 5G and beyond, the ME7840A plays a crucial role in ensuring that devices meet the rigorous standards required for modern connectivity.

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