A 2.7-V 11.8-mW baseband ADC with 72-dB dynamic range for GSM applications

A receive baseband analog-to-digital converter (ADC) for a GSM cellular rad io system is presented. Low voltage and low power techniques have been appl ied across many aspects of the design. The circuit consists of two second-o rder double-sampled semi-bilinear Sigma Delta modulators followed by two 57 6-tap digital finite-impulse response (FIR) GSM-channel filters with offset calibration, The complete ADC achieves a dynamic range of 72 dB and dissip ates 11.8 mW from a 2,7-V supply. The area is 1.6 mm(2) in a 0.5 mu m n-wel l double-poly triple-metal CMOS process.