A self calibration technique for tunable continuous-time bandpass delta-sigma modulators

Afifi, M.; Shahein, Ahmed; Maurer, Michael; Keller, Matthias; Manoli, Yiannos

doi:10.1109/iscas.2012.6271943

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…A total of five chips were tested to verify the repeatability of the data. This work defines a new parameter SNDR coefficient with frequency (S.CF) to depict the relative change of the SNDR, which is calculated in (10). The S.CF is reduced to 1.13%/kHz with signal observation.…”

Section: 58mmmentioning

confidence: 99%

“…SNDR max − SNDR min ( f max − f min )•SNDR average (10) Sensors 2020, 20, x FOR PEER REVIEW 10 of 14 frequency noise, the noise-shaping is slightly degraded when the input signal is below 9 kHz and frequency deviation significantly decreases, with a maximum value of less than 110 Hz. Figure 16a,b and c show that the smaller the frequency deviation, the larger the value of the SNDR and the lower the value of the IBN.…”

Section: Scf =mentioning

confidence: 99%

“…However, a CT circuit is sensitive to process, temperature, and voltage variations [10], as filter time constants are a function of resistances or transconductances. Since there is a narrow bandwidth signal in gyroscope readout systems, the relative matching requirements on the electronic filter are stringent [11].…”

Section: Introductionmentioning

confidence: 99%

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An Auto-Tuning Continuous-Time Bandpass Sigma-Delta Modulator with Signal Observation for MEMS Gyroscope Readout Systems

Zou

et al. 2020

Sensors

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This paper presents the design and implementation of an auto-tuning continuous-time bandpass sigma-delta (ΣΔ) modulator for micro-electromechchanical systems (MEMS) gyroscope readout systems. Its notch frequency can well match the input signal frequency by adding a signal observation to the traditional ΣΔ modulator. The filter of the observation adopts the same architecture as that of the traditional ΣΔ modulator, allowing the two filters to have the same response to input signal change, which is converted into a control voltage on metal-oxide semiconductor (MOS) resistance in the filters. The automatic tuning not only works to solve the mismatch problem caused by process error and temperature variation, but can also be applied to the interface circuit of gyroscopes with different resonant frequencies. The circuit is implemented in a 0.18-μm complementary metal-oxide semiconductor (CMOS) process with a core area of 2.4 mm2. The improved modulator achieves a dynamic range of 106 dB, a noise floor below 120 dB and a maximum signal-to-noise and distortion ratio (SNDR) of 86.4 dB. The tuning capability of the chip is relatively stable under input signals from 6 to 15 kHz at temperatures ranging from −45 to 60 °C.

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Section: 58mmmentioning

confidence: 99%

Section: Scf =mentioning

confidence: 99%