Design and Simulation of multi mode Continuous Time -Delta Sigma Modulator for wireless communication standards
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Design and Simulation of multi mode
Continuous Time -Delta Sigma Modulator
for wireless communication standards
Analog to Digital Converter
Nyquist - Rate ADCs
Over sampling ADCs
∑ / ∫
very high resolution(12-24 bit)
Analog part small area
robustness to circuit imperfections
Moderate bandwidth due to oversampling
12-24 bit Resolution
Quantization noise power density
Quantization noise and in-band noise for OSR = 1
Quantization noise and in-band noise for OSR = 4
DT Δ Σ modulator
CT Δ Σ modulator
STF : Signal Transfer Function
NTF : Noise Transfer Function
2nd order DSM
2nd order DSM
System-level simulation is a great benefit before circuit-level simulation
Integrator leakage due to finite gain
Critical op-amp DC gain
Critical op-amp BW
Critical op-amp Slew Rate
Scaling coefficients of the Delta Sigma Modulator
Out put of second int.
Out put of first int.
United-States : IS-95 / CDMA2000
China : TD-SCDMA
Gabon : GSM900
Standards evolution on mobile terminals
Chip area restrictions
Why multi-standard ????
Multi standard solution
Multi standard receiver
Worldwide Communications Systems
Bi-standard or tri-standard mobile phones
Design of a reconfigurable RF transmitter IC able to address every standard
Quality of Service (QoS)
Global (worst case)
Flexible / Reconfigurable
GSM mode DSM
WCDMA mode DSM
WLAN mode DSM
worst-case set of specifications ( WLAN)
Consume way too much power for most of the standards and operation modes
Flexible / Reconfigurable
DR : Dynamic range
L : Order of modulator
OSR : Over Sampling Ratio
B : Quantizer Resolution
fs : Sampling Frequency
f0 : Modulator Bandwidth
Increasing the order of the modulator
Increasing the resolution of the quantizer
Increasing the Sampling frequency
higher order digital filter downstream
feedback DAC DEM technique considerable complexity to the design
power in the quantizer and feedback DAC
process limitations in 0.18μm 500MHz is reasonable
A Multi-Mode Sigma-Delta ADC for GSM / WCDMA / WLAN Applications [Babita R. Jose]
A 1.2-V Dual-Mode WCDMA/GPRS ΣΔ Modulator [Alessandro Dezzani]
A Triple-Mode Sigma-Delta Modulator for Multi-Standard Wireless Radio Receivers [ANA RUSU]
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G. Gomez, and B. Haroun,“ A 1.5V 2.4/2.9mW 79/50 dB DR ΣΔ Modulator for GSM/WCDMA in a 0.13μm Digital Process,” In IEEE ISSCC Conference Digest of Technical Papers, pp. 242–244, 2002.