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130 Chapter 4
Making Measurements
Making the Adjacent Channel Power (ACP) Measurement
Troubleshooting Hints
This adjacent channel power ratio measurement can reveal degraded or
defective parts in the transmitter section of the UUT. The following
examples are those areas to be checked further.
• Some faults in the DC power supply control of the transmitter power
amplifier, RF power controller of the pre-power amplifier stage, or
I/Q control of the baseband stage.
• Some degradation in the gain and output power level of the amplifier
due to the degraded gain control and/or increased distortion.
• Some degradation of the amplifier linearity and other performance
characteristics.
Power amplifiers are one of the final stage elements of a base or mobile
transmitter and are a critical part of meeting the important power and
spectral efficiency specifications. Since ACP measures the spectral
response of the amplifier to a complex wideband signal, it is a key
measurement linking amplifier linearity and other performance
characteristics to the stringent system specifications.