svensl
Full Member level 1
Hello all,
So I was wondering how to choose the reference voltage for the DAC in the sigma delta ADC. Considering a 1.5V process the input sinusoid is centred around 750mV. With the quantizer levels of 1.5V and 0V what value do I need to feed back to the input. If I were to use 1.5 and 0V as feedback signal, I would get negative values after subtracting the feedback from the input. So how do I avoid going below 0V?
Thanks
So I was wondering how to choose the reference voltage for the DAC in the sigma delta ADC. Considering a 1.5V process the input sinusoid is centred around 750mV. With the quantizer levels of 1.5V and 0V what value do I need to feed back to the input. If I were to use 1.5 and 0V as feedback signal, I would get negative values after subtracting the feedback from the input. So how do I avoid going below 0V?
Thanks