Publication

An internally non-linear ADC for a ΣΔ accelerometer loop

Maher Kayal, Marc Pastre
2010
Conference Papers

Abstract

If an analog-to-digital converter (ADC) is used within a ΣΔ converter such that the loop filter is mixed signal, then the ADC does not need to have the full resolution of the ΣΔ converter, and its input values will not be uniformly distributed over the input range. In this paper, we argue that the best input distribution to use as a general model is the maximumentropy distribution (for location parameters: the Gaussian distribution). We then describe an externally linear ADC with non-linearly spaced decision boundaries implemented in 0.6μ m CMOS and show measurement results of a 19-bit dynamic range ΣΔ accelerometer loop inside which the ADC reaches more than the required 7-bit performance with only 2 6 decision levels. ©2010 IEEE.

Official source

https://infoscience.epfl.ch/entities/publication/94f9faea-4dbe-4e4a-a557-c3b79f9da49b

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Maher Kayal, Marc Pastre
2010
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/94f9faea-4dbe-4e4a-a557-c3b79f9da49b

About this result

Related concepts (32)

Location parameter

In statistics, a location parameter of a probability distribution is a scalar- or vector-valued parameter , which determines the "location" or shift of the distribution. In the literature of location parameter estimation, the probability distributions with such parameter are found to be formally defined in one of the following equivalent ways: either as having a probability density function or probability mass function ; or having a cumulative distribution function ; or being defined as resulting from the random variable transformation , where is a random variable with a certain, possibly unknown, distribution (See also #Additive_noise).

Analog-to-digital converter

In electronics, an analog-to-digital converter (ADC, A/D, or A-to-D) is a system that converts an analog signal, such as a sound picked up by a microphone or light entering a digital camera, into a digital signal. An ADC may also provide an isolated measurement such as an electronic device that converts an analog input voltage or current to a digital number representing the magnitude of the voltage or current. Typically the digital output is a two's complement binary number that is proportional to the input, but there are other possibilities.

Digital-to-analog converter

In electronics, a digital-to-analog converter (DAC, D/A, D2A, or D-to-A) is a system that converts a digital signal into an analog signal. An analog-to-digital converter (ADC) performs the reverse function. There are several DAC architectures; the suitability of a DAC for a particular application is determined by figures of merit including: resolution, maximum sampling frequency and others. Digital-to-analog conversion can degrade a signal, so a DAC should be specified that has insignificant errors in terms of the application.

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