Special frequency sweeping instrument for debugging digital radio

The invention specifically discloses a special frequency sweeping instrument for debugging a digital radio. The special frequency sweeping instrument comprises a liquid crystal display screen, a microcontroller, a touch keyboard, a DDS signal source, a broadband amplifier, a first attenuation network, a first isolation amplifier, a true RMS conversion circuit, a comparison attenuation circuit, a logarithmic detector, a low-pass filter and an A/D sampling circuit. The special frequency sweeping instrument also comprises a second isolation amplifier, a second attenuation network and a third isolation amplifier which are connected in sequence. The microprocessor is used for controlling the direct frequency synthesis (DDS) chip to generate a frequency sweep signal required for debugging the radio, the frequency sweep range is 100KHz-3MHz, a frequency characteristic curve is displayed on the LCD liquid crystal screen, and the digital function enables debugging and numerical value reading to be very convenient. 本发明