A double comb filter method for testing of quantisers

Belcher, R.A.

doi:10.1049/cp:19990468

Cited by 1 publication

(3 citation statements)

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“…As the DCF SINAD is within ±0.1 dB of the true value, from (28) this is an ENOB uncertainty of ±0.02 effective bits over the range 8-20 bits. This is also within the range measured with a sine wave.…”

Section: B Simulations To Determine Correct Measurement Filter Gain mentioning

confidence: 91%

“…It was also used to measure quantizing distortion and quantizing error [27] in the evolving BBC digital audio systems. This application is described in more detail elsewhere [28]. Both the audio and ADC applications can be now implemented using just the hardware of a personal computer and application software.…”

Section: Dcf Methodsmentioning

confidence: 99%

“…If this configuration is used then all the quantizing error will appear on the PRBS spectral lines and be hidden. In that situation clearly (28) will not measure quantizing error. However, if noise is added to the ideal ADC then as random noise is not correlated with the test signal it is not hidden so (28) will give a noise-based ENOB.…”

Section: B Simulations To Determine Correct Measurement Filter Gain mentioning

confidence: 99%

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ADC Standard IEC 60748-4-3: Precision Measurement of Alternative ENOB Without a Sine Wave

Belcher

2015

IEEE Trans. Instrum. Meas.

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A practical analog-to-digital converter (ADC) introduces quantization error in excess of the ideal value and one way of expressing this is by comparing the value of this error with that of an ideal ADC. This comparison is known as the effective number of bits (ENOBs). It is accepted practice to measure ENOB using the signal-to-noise and distortion (SINAD) ratio of a sine-wave input. This paper extends ENOB theory to any arbitrary waveform by including the crest factor of the input signal. It is now possible to apply the ENOB concept to wideband systems. Measuring the SINAD of an arbitrary or multitone waveform with precision normally requires the use of laboratory standard test equipment. However, International Electrotechnical Commission standard 60748-4-3 specifies an alternative method for wideband SINAD measurements that may also be suitable for built-in test. It is essentially a multitone test using two pseudorandom signal sources and is sometimes known as the double comb-filter (DCF) method. This paper demonstrates the requirements for a practical implementation of a DCF-based system for measuring an ENOB of up to 24 bits. It is shown that in a practical application, DCF ENOB and sine-wave ENOB results have similar levels of accuracy, but in the presence of amplitude nonlinearity the differing test signal amplitude weightings cannot fundamentally produce the same ENOB figure. It is shown that DCF ENOB is more representative of communications system performance and therefore extends the use of ENOB to wideband applications.

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Section: B Simulations To Determine Correct Measurement Filter Gain mentioning

confidence: 91%

Section: Dcf Methodsmentioning

confidence: 99%

Section: B Simulations To Determine Correct Measurement Filter Gain mentioning

confidence: 99%

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ADC Standard IEC 60748-4-3: Precision Measurement of Alternative ENOB Without a Sine Wave

Belcher

2015

IEEE Trans. Instrum. Meas.

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A double comb filter method for testing of quantisers

Cited by 1 publication

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ADC Standard IEC 60748-4-3: Precision Measurement of Alternative ENOB Without a Sine Wave

ADC Standard IEC 60748-4-3: Precision Measurement of Alternative ENOB Without a Sine Wave

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