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A Continuous Time Delta-Sigma Modulator with Reduced Clock Jitter Sensitivity through DSCR Feedback

Författare:
Publiceringsår: 2012
Språk: Engelska
Publikation/Tidskrift/Serie: Analog Integrated Circuits and Signal Processing
Dokumenttyp: Artikel i tidskrift
Förlag: Springer

Sammanfattning

The performance of continuous time deltasigma

modulators is limited by their large sensitivity to

feedback pulse-width variations caused by clock jitter in

their feedback DACs. To mitigate that effect, a dual switched-

capacitor-resistor feedback DAC technique is proposed.

The architecture has the additional benefit of

reducing the typically high switched-capacitor-resistor

DAC output peak currents, resulting in reduced slew-rate

requirements for the loop-filter integrators. The feedback

technique has been implemented with a third order, 3-bit

delta-sigma modulator for a low power radio receiver, in a

65 nm CMOS process, where it occupies an area of

0.17 mm2. It achieves an SNDR of 70 dB over a 125 kHz

bandwidth with an oversampling ratio of 16. The power

consumption is 380 lW from a 900 mV supply.

Nyckelord

  • Electrical Engineering, Electronic Engineering, Information Engineering

Övriga

Published
  • ISSN: 0925-1030

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