Is ADL5535 designed for a specific output power?

I called in to ADI's tech support asking why I was getting less OIP3 than what is stated in the specification section in the datasheet and was pointed to figure 7 on page 8 showing OIP3 versus output power.  I see there a significant spike in OIP3 at Pout=3dBm.  Is there a specific reason why OIP3 is best at 3dBm?  Was it designed to be this way?

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  • The ADL5535 has a harmonic cancellation circuit which improves OIP3. The draw back to this approach is optimization is limited to a particular frequency and not the entire bandwidth of the amplifier.  It is expected that someone using the ADL5535 would operate around 0 dBm output power. This would allow for large crestfactor swings WCDMA type modulated signals and not drive the amplifier beyond its 1 dB compression point.

Reply
  • The ADL5535 has a harmonic cancellation circuit which improves OIP3. The draw back to this approach is optimization is limited to a particular frequency and not the entire bandwidth of the amplifier.  It is expected that someone using the ADL5535 would operate around 0 dBm output power. This would allow for large crestfactor swings WCDMA type modulated signals and not drive the amplifier beyond its 1 dB compression point.

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