BRIAN_PENG
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Dear all:
I got a problem with high THD degradation on simple 3 stage opamp circuit.
The THD is normal and the same as loop back from PXI-5422 (SG) to PXI-5122 (SA) on Ft(input frequency)=1Mhz sinewave or below. If inputing 10Mhz signal, THD degrad seriously per stage. I've calculated the THD degradation of THS4011, it's around -70dBc in 1Mhz, shouldn't be so worse as in figure I show you in attachment. Is that related to the RF reflection between stages? The PCB routing between stages are short.
Appreciate for your help!
Brianbrian_peng1@yahoo.com.tw
I got a problem with high THD degradation on simple 3 stage opamp circuit.
The THD is normal and the same as loop back from PXI-5422 (SG) to PXI-5122 (SA) on Ft(input frequency)=1Mhz sinewave or below. If inputing 10Mhz signal, THD degrad seriously per stage. I've calculated the THD degradation of THS4011, it's around -70dBc in 1Mhz, shouldn't be so worse as in figure I show you in attachment. Is that related to the RF reflection between stages? The PCB routing between stages are short.
Appreciate for your help!
Brianbrian_peng1@yahoo.com.tw