TY - GEN
T1 - A sixth-order 4-2 SMASH CIFF complex bandpass ΔΣ modulator with delaying digital input feedforward
AU - Kuo, Chien Hung
AU - Lai, Hung Jing
AU - Shi, Deng Yao
PY - 2010
Y1 - 2010
N2 - In this paper, a sixth-order sturdy multi-stage noise shaping (SMASH) bandpass delta-sigma (ΔΣ) modulator [1] with delaying digital input feedforward (DFF) structure [2,3] is presented. The second-order ΔΣ modulator with cascade integrators and distributed feedforward (CIFF) [4] is utilized in each stage to reduce the signal swing. Hence, the requirement of opamp and the power consumption of circuits can be reduced due to the suppression of the signal swing and the discarding of the digital cancellation filters. One pair of complex zeros is designed within signal bandwidth to effectively suppress the noise floor of the presented modulator. The sub-sampling technique is adopted to reduce the clock frequency and the requirement of opamp. Simulation results confirm the feasibility of the proposed SMASH CIFF bandpass ΔΣ modulator with delaying DFF structure. The proposed bandpass ΔΣ modulator compared to the single-loop AFF structure, the signal-to-noise plus distortion ratio (SNDR) could be increased by 12 dB, and the dynamic range (DR) could be extended by roughly 15 dB in a 200 kHz of signal bandwidth centered at 10.7 MHz.
AB - In this paper, a sixth-order sturdy multi-stage noise shaping (SMASH) bandpass delta-sigma (ΔΣ) modulator [1] with delaying digital input feedforward (DFF) structure [2,3] is presented. The second-order ΔΣ modulator with cascade integrators and distributed feedforward (CIFF) [4] is utilized in each stage to reduce the signal swing. Hence, the requirement of opamp and the power consumption of circuits can be reduced due to the suppression of the signal swing and the discarding of the digital cancellation filters. One pair of complex zeros is designed within signal bandwidth to effectively suppress the noise floor of the presented modulator. The sub-sampling technique is adopted to reduce the clock frequency and the requirement of opamp. Simulation results confirm the feasibility of the proposed SMASH CIFF bandpass ΔΣ modulator with delaying DFF structure. The proposed bandpass ΔΣ modulator compared to the single-loop AFF structure, the signal-to-noise plus distortion ratio (SNDR) could be increased by 12 dB, and the dynamic range (DR) could be extended by roughly 15 dB in a 200 kHz of signal bandwidth centered at 10.7 MHz.
UR - http://www.scopus.com/inward/record.url?scp=77955990161&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77955990161&partnerID=8YFLogxK
U2 - 10.1109/ISCAS.2010.5537848
DO - 10.1109/ISCAS.2010.5537848
M3 - Conference contribution
AN - SCOPUS:77955990161
SN - 9781424453085
T3 - ISCAS 2010 - 2010 IEEE International Symposium on Circuits and Systems: Nano-Bio Circuit Fabrics and Systems
SP - 305
EP - 308
BT - ISCAS 2010 - 2010 IEEE International Symposium on Circuits and Systems
T2 - 2010 IEEE International Symposium on Circuits and Systems: Nano-Bio Circuit Fabrics and Systems, ISCAS 2010
Y2 - 30 May 2010 through 2 June 2010
ER -