svensl
Full Member level 1
Hello all;
Consider a sigma delta modulator with a sinc decimation filter.
The output will be a 7 bit digital signal. Power supply is 1.5V.
What I want to do is throw away roughly 100mV from the supply rails. So I want my effective output to be in the range of 0.1 to 1.4V. Hence I want the output of the decimation filter to be b'0 for 0.1V and b'1 for 1.4V with 128 LSB steps in between.
Obviously the digital o/p for 0.1V is NOT 0000000 and similarly NOT 1111111 for 1.4V. How can make sure that 0.1V and 1.4V map to the correct digital values?
Thanks
Consider a sigma delta modulator with a sinc decimation filter.
The output will be a 7 bit digital signal. Power supply is 1.5V.
What I want to do is throw away roughly 100mV from the supply rails. So I want my effective output to be in the range of 0.1 to 1.4V. Hence I want the output of the decimation filter to be b'0 for 0.1V and b'1 for 1.4V with 128 LSB steps in between.
Obviously the digital o/p for 0.1V is NOT 0000000 and similarly NOT 1111111 for 1.4V. How can make sure that 0.1V and 1.4V map to the correct digital values?
Thanks