A 96dB Dynamic Range 2kHz Bandwidth 2nd Order Delta-Sigma Modulator Using Modified Feed-Forward Architecture With Delayed Feedback
- 주제(키워드) 도움말 Modulation , Adders , Attenuation , Delays , Capacitors , Transfer functions , Switches , Analog-to-digital converter , delayed feedback , delta-sigma modulator , discrete-time , feed-forward , successive approximation register
- 발행기관 IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- 발행년도 2021
- 총서유형 Journal
- 본문언어 영어
초록/요약 도움말
This brief presents a second-order discrete-time (DT) modified feed-forward (FF) delta-sigma modulator. To reduce the attenuation of the quantizer's input signal due to switched-capacitor (SC) passive summing, the proposed modulator eliminates the internal FF path and reduces the number of input signals of the adder. A 4-bit asynchronous successive-approximation-register (SAR) analog-to-digital converter (ADC) incorporated with a passive adder is used to reduce power consumption and area. To allow the conversion delay of the SAR ADC, a delayed feedback is adopted. The prototype ADC is fabricated in a 0.11 mu m CMOS process using four metal layers with an active die area of 0.165mm(2). It achieves a dynamic range (DR) of 96.3 dB and a peak signal-to-noise and distortion ratio (SNDR) of 93.9 dB in a 2 kHz signal bandwidth while consuming 62.43 mu W from a 1.8V/1.65V power supply, corresponding to a Schreier figure-of-merit (FOM) of 171dB.
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