IMD Measurements using Vector Network Analyzers

kevinwjs

Intermodulation distortion (IMD) has become increasingly
important in microwave and RF amplifier design. As
modulation techniques become more sophisticated, greater
performance is required from amplifier and receiver circuits.
Unlike harmonic and second order distortion products, third
order intermodulation distortion products (IP3) are in-band
and cannot be easily filtered. Therefore, innovative designs
using special feedback and feedforward techniques have been
developed that greatly improve IMD performance. This
enables amplifiers to operate at much higher output levels
while maintaining low distortion products. As a device’s
intermodulation distortion is improved, greater demands are
made on measurement equipment. This Application Note
discusses the concept of measuring third order products using
the Anritsu 373XX series of Vector Network Analyzers, in
conjunction with Anritsu 68XXX or 69XXX synthesizers.
Second order products will be shown for completeness, but
emphasis is placed on the measurement of third order products
and the calculations required to determine the swept
third order intercept (TOI) point.

trentlee

thank you very much ...

aaronlin520

感謝bap

aaronlin520

感謝分享

leelucky

thanks

chunwen1

thanks a lot

sehilly

thanks for sharing

adnan

thanks.

efong

THANK YOU

dannymu

谢谢