By means of both the Hilbert-Huang transform(HHT) and the traversal method,under the circumstances of 7-bit signal source,and with both the harmonic distortion and the noise distortion existing,parameters of fitting sinusoid are obtained from the analog-to-digital converter(ADC) output data,and then the effective number of bits(ENOBs) of 14-bit ADC are tested accurately.

A new sine fitting method for testing the effective number of bits (ENOBs) of high-resolution ana-log-to-digital converter (ADC) is presented in this paper.

The Measurement of Respondence Characteristics and Effective Bits of Digital Storage Oscilloscope;

In most effective bits evaluation of waveform recorders, the prerequisite is that there is no signal source distortion, or the distortion can be neglected.

Results from both theoretical analysis and experimental simulation show that the proposed S/H circuit has a sampling rate of 60 MHz with ENOB at 7.

The result of performance test shows that the inter-channel consistency of dual-channel sampling circuit is perfect and the ENOB of ADC is more than 6 bits, which satisfies the application requirement.

In data acquisition,a sine wave is input to system,and DSP is used to control sampling,and analog-to-digital converted data is stored and FFT transformed,so the Signal-to-Noise Ratio(SNR) and effective number of bits(ENOB) of the ADC can be analyzed.

New comprehension for significant digits is brought up in :any measured value is significant digits which include accurate value and uncertain value and which are decided by significant figure.

The paper discusses the basic method of determination of significant figure of measure result on the basis of analyzing various error.