A 3.2 mW 0.13 μm high sensitivity frequency-domain CMOS capacitance interface

Gaggatur, Javed S; Dixena, Pradeep Kumar; Banerjee, Gaurab

doi:10.1109/iscas.2016.7527429

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…Theoretically, replacing any capacitor in electronic oscillators by a capacitance sensor yields a sensor-controlled oscillator whose frequency depends on the sensed signal. Figure 1 shows three main types of these: a relaxation-oscillator type ( Figure 1 a) [ 4 , 34 , 35 , 36 , 37 , 38 , 39 ], a ring-oscillator type ( Figure 1 b) [ 19 , 26 , 27 , 28 , 29 ] and an LC oscillator type ( Figure 1 c) [ 17 , 18 , 40 , 41 ]. In these, the information measured from the sensors is transformed to frequency and then it is further digitized by simple counters [ 19 , 29 , 34 , 39 , 41 ], time-to-digital converters (TDC) [ 26 , 37 , 38 ] or by the combination of frequency-to-voltage converters (F2Vs) and normal analog-to-digital converters (ADCs) [ 17 , 18 , 27 , 28 , 35 , 36 , 40 ].…”

Section: Basic Operating Principles Properties and Challenges Of mentioning

confidence: 99%

“…There are unique properties and challenges for frequency-based sensor readout systems in general. Some of these have been addressed in literature [ 24 , 25 , 26 , 27 , 28 , 29 ]. For example, Reference [ 25 ] gives a general discussion about time-based circuits.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Reference [ 25 ] gives a general discussion about time-based circuits. The works in [ 26 , 27 , 28 , 29 ] mainly focus on the topic of ring-oscillator-based sensor interfaces. However, LC oscillators can typically achieve better performance in terms of the phase noise and jitter for a given power budget [ 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

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On Frequency-Based Interface Circuits for Capacitive MEMS Accelerometers

et al. 2018

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Interface circuits for capacitive MEMS accelerometers are conventionally based on charge-based approaches. A promising alternative to these is provided by frequency-based readout techniques that have some unique advantages as well as a few challenges associated with them. This paper addresses these techniques and presents a derivation of the fundamental resolution limits that are imposed on them by phase noise. Starting with an overview of basic operating principles, associated properties and challenges, the discussions then focus on the fundamental trade-offs between noise, power dissipation and signal bandwidth (BW) for the LC-oscillator-based frequency readout and for the conventional charge-based switched-capacitor (SC) readout. Closed-form analytical formulas are derived to facilitate a fair comparison between the two approaches. Benchmarking results indicate that, with the same bandwidth requirement, charge-based readout circuits are more suitable when optimizing for noise performance, while there is still some room for frequency-based techniques when optimizing for power consumption, especially when flicker phase noise can be mitigated.

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