Dual Mode Reconfigurable Continuous Time Delta-Sigma Modulator for GSM/WCDMA Standards
کلمات کلیدی:
Delta sigma Modulator, Reconfigurable, Multi Mode,gm over ID.
چکیده:
Dual mode high performance reconfigurablecontinuous time delta sigma modulator with concentration onreducing the active blocks and power saving is presented in thisarticle. The modulator makes use of a low distortion suppressiontopology which is suitable for wide band applications and a NoiseShaping Enhancement (NSE) technique for increasing theperformance of the modulator. A None Return to Zero (NRZ)DACs pulse shaping are selected to decrease clock jittersensitivity and Excess Loop Delay (ELD) compensation isconsidered to increase the system stability. Also several noneidealities have been considered in this design. In device level, gmover ID method is opted for designing the modulator analoguecells. The modulator achieves 85/90 dB SNDR within 0. 2/2 MHzbandwidth and consumes 3. 4/5 mW for GSM and WCDMAstandards respectively.