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- W2004102194 abstract "Self-oscillating ΣΔ modulators are a class of ΣΔ modulators that combines noise shaping with pulsewidth modulation (PWM). Moreover, in such a modulator, the PWM carrier is generated by a self-oscillation mode that is deliberately introduced. In our approach, this self-oscillation is accurately controlled by a digital delay in the feedback loop. The concept is elaborated for a second-order self-oscillating ΣΔ modulator with 5-MHz bandwidth. Here, the clock frequency equals 850 MHz, but the loop only has to process signals that are maximally at the self-oscillation frequency (at 106.25 MHz). An additional key element in this design is the use of a feedback FIRDAC which reduces the jitter sensitivity and further relaxes the slewing requirements of the first opamp in the loop. The prototype modulator is fabricated in a 0.18-μm CMOS process and achieves a dynamic range of 66 dB. Due to the simplicity of the circuit, the modulator core area is only 0.025 mm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sup> . The power consumption of the modulator is 6 mW." @default.
- W2004102194 created "2016-06-24" @default.
- W2004102194 creator A5079736391 @default.
- W2004102194 creator A5083180838 @default.
- W2004102194 date "2011-08-01" @default.
- W2004102194 modified "2023-09-27" @default.
- W2004102194 title "A 5-MHz 11-Bit Self-Oscillating $SigmaDelta$ Modulator With a Delay-Based Phase Shifter in 0.025 mm$^2$" @default.
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- W2004102194 doi "https://doi.org/10.1109/jssc.2011.2151430" @default.
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