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Correction method for TIADC gain and time error based on spectral analysis

A time error and correction method technology, applied in the direction of analog-to-digital converters, etc., can solve the problems of reducing system performance, existing errors, affecting the signal-to-noise ratio and effective number of TIADC systems, etc., to achieve simple calculation, strong engineering applicability, high precision effect

Active Publication Date: 2016-12-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0006] Ideally, the offset, gain and time errors do not exist, but in reality, there are inevitably errors, and the gain and time errors will be in nf s / M±f in There is an error spectrum, which affects the signal-to-noise ratio and effective number of bits of the TIADC system, and reduces system performance

Method used

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  • Correction method for TIADC gain and time error based on spectral analysis
  • Correction method for TIADC gain and time error based on spectral analysis
  • Correction method for TIADC gain and time error based on spectral analysis

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[0031] figure 2 It is a flow chart of the correction method of TIADC gain and time error based on spectrum analysis.

[0032] In this example, if figure 2 Shown, the present invention is based on the correction method of the TIADC gain of frequency spectrum analysis and time error, comprises the following steps:

[0033] S1, the sinusoidal signal x a (t)=A sin(Ω 0 t) Input to the time-alternating ADC (TIADC, Time-interleaved ADC) acquisition system, where A is the amplitude of the input signal, Ω 0 is the angular frequency, and L is the number of FFT points, L=2 n , n is a positive integer, P is a positive integer, and is relatively prime to L, that is, only one common divisor of L and P is 1, M is the number of parallel channels of the TIADC system, f s is the sampling rate of the TIADC system, and its sampling period is T s , such that the input signal makes a single sub-ADC also satisfy the Nyquist sampling theorem.

[0034] In the present embodiment, TIADC is ...

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Abstract

The invention discloses a correction method for a TIADC gain and a time error based on spectral analysis. The spectral analysis is carried out on branch ADC sampling data by employing FFT, an amplitude and a phase on a specific frequency point are calculated to obtain corresponding gain and time error estimated values, and then corresponding gain and time error correction values are obtained. This method is simple to implement, extremely strong in engineering application, simple in calculation and high in accuracy.

Description

technical field [0001] The invention belongs to the technical field of signal sampling, and more specifically relates to a method for correcting TIADC gain and time error based on frequency spectrum analysis. Background technique [0002] The multi-channel parallel ADC acquisition system can effectively improve the equivalent sampling rate of the system while ensuring high sampling accuracy. However, in all possible parallel ADC acquisition systems, the parallel ADC acquisition system based on time alternation, that is, TIADC interleaved ADC, time alternate analog-to-digital converter) structure is the most simple and effective. Theoretically speaking, the highest achievable sampling rate of the TIADC acquisition system is only limited to: 1, the bandwidth of the input signal; 2, the maximum allowable power consumption of the system; 3, the maximum allowable space of the circuit board or integrated circuit. [0003] TIADC has M parallel channels, and each channel uses exact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
Inventor 蒋俊孔祥伟叶芃郭连平杨扩军
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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