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Hi,
I designed 2nd order sigma-delta modulator (1bit), and made chip, and measuring now.
I use FPGA after modulator output. the FPGA is used for sinc3 decimation filter (16bit out).
I have a distortion problem for measurement.
test condition;
VDD=3V, VSS=0V, VREF+=3V, VREF-=0V...
I am testng sigma-delta modulator (SC) that I designed.
*2nd order - 1bit output(SC)
*fully-differential input
*fclk=500k
*gain=1
*VDD=3V, Vcommon=1.5V
in these case ,
1) Vinp=Vcommon, Vinm=0to3V swep ---> gain=almost 0, INL=4LSB
2) Vinm=0to3V, Vinm=Vcommon swep ---> gain=lower than 0...
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