How to Troubleshoot PA Amplifier Signal Distortion

1. Troubleshooting Signal Source and Input Link Issues

First, determine whether the signal distortion originates from the signal source or input link
Check that the signal source device is functioning properly - replace with a backup signal source for testing
Inspect input cables for damage, poor contact, or the use of low-quality, unshielded cables
Replace cables with intact, well-shielded ones and ensure connectors are secure
These issues can cause signal attenuation, introduce interference, and cause distortion in the PA amplifier

Improper parameter settings or load mismatch are common causes of signal distortion
Check whether the PA amplifier's input signal strength is too high
Reduce signal source output strength or adjust amplifier's input gain if input exceeds rated range
Check impedance match between the PA amplifier and the load
Replace load with suitable impedance or adjust output matching circuitry if impedance mismatch exists

If external factors have been eliminated, check the PA amplifier itself for malfunctions
Observe internal components for signs of aging or damage (capacitor leakage, transistor degradation, resistor deterioration)
These component failures can cause circuit operating point shifts and generate nonlinear distortion
Check if the PA amplifier's heat dissipation is poor and if the chip is overheating
Clean heat dissipation holes and ensure cooling fan is operating properly to prevent overheating issues

External interference can also cause signal distortion in PA amplifiers
If strong electromagnetic interference sources are nearby, move the device or install shielding
Install an electromagnetic shielding case around the PA amplifier to reduce impact of external radiation
If operating environment voltage is unstable, equip with a voltage-stabilized power supply
Ensure stable power supply voltage to avoid fluctuations affecting signal amplification quality