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Design >> RF Design >> Degrading OOS in low-temperature
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Message started by Yutao Liu on Apr 5^th, 2012, 7:22am

Title: Degrading OOS in low-temperature
Post by Yutao Liu on Apr 5^th, 2012, 7:22am

Dear everyone,
I encounter a problem on Origin Offset Suppression with 8PSK modulation. My transmitter is a direct up-conversion topology. Under conditions where temperature is 25 and 75 Celsius degree, OOS is about -31dB and -35dB respectively. But under low-temperature condition with -20 Celsius degree, OOS degrades to -25dB.

I want to know which factor would dominate OOS with temperature variance, LO leakage/self-mixing or I/Q channel mismatch.

Welcome any suggestion. Thanks!

Best,
Yutao