A two-channel time-interleaved second-order Sigma-Delta modulator for
broadband applications is presented. The system is using output prediction
scheme. So the modulator uses a single integrator channel which does not require
additional active elements for the quantizer input generation, since the integrator
outputs are directly used as the input of the quantizers. As a result, the entire
modulator can be implemented using only two op-amps, which is beneficial for
both power consumption and area. The Sigma-Delta modulator achieves a signal
to noise ratio of 70 dB over a 1.1-MHz signal bandwidth with an effective clock
frequency of 132 MHz. And this means an effective resolution of 12 bits. The total
power consumption of the Sigma-Delta modulator is 36mW from a ±1.8V supply.