Abstract
This paper illustrates the design of a 10.7 MHz band-pass sigma-delta modulator for intermediate frequency demodulation in digital radio systems. The modulator has been designed in two different technologies: 1.2 /spl mu/m BiCMOS and 1.2 /spl mu/m CMOS. Circuit solutions with numerical simulations are presented and discussed. The band-pass modulator can be realized in monolithic technology using the pseudo-N-path approach, thus implementing a second-order transfer function using only one operational amplifier. In both technologies, the modulator signal-to-noise ratio is approximately 48 dB over a band of 200 kHz centered around 10.7 MHz, corresponding to 8 bits of resolution after decimation.
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