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ADRV9002 Receiver gain


In ADRV9002 datasheet and software development guide, it is mentioned that the analog attenuator before mixer in receiver path can be programmed from 0 to 36 dB attenuation. The LPF followed by mixer would provide 20 dB of gain. So, in my understanding the receiver path should give -16dB (-36+20 at maximum attenuation) to 20 dB (0+20 at minimum attenuation) gain.

But the s-parameters provided in ADRV9002 design file is giving -58 to -15dB gain. It is also mentioned it is at minimum attenuation .The simulated s-parameters is attached for your reference.

Kindly elaborate how it is possible?