A review on low-complexity structures and algorithms for the correction of mismatch errors in time-interleaved ADCs

Vogel, Christian; Hotz, Matthias; Saleem, Shahzad; Hausmair, Katharina; Soudan, Michael

doi:10.1109/newcas.2012.6329028

Cited by 16 publications

(11 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This stems from the fact that the P th-order inverse in [10] and [11] as well as the method in [13] require a (stable) inverse filter for the first-order Volterra operator. This time-varying arXiv:1404.5901v1 [cs.SY] 23 Apr 2014 inverse filter is usually not known and, in practice, has to be approximated using filter design techniques as discussed, e.g., in [16]. Therefore, a change of the first-order Volterra operator implies the need for a computationally costly filter design of its inverse.…”

Section: A Contributions and Outlinementioning

confidence: 99%

See 1 more Smart Citation

Linearization of Time-Varying Nonlinear Systems Using A Modified Linear Iterative Method

Hotz

Vogel

2014

IEEE Trans. Signal Process.

Self Cite

View full text Add to dashboard Cite

The linearization of nonlinear systems is an important digital enhancement technique. In this paper, a real-time capable post-and pre-linearization method for the widely applicable time-varying discrete-time Volterra series is presented. To this end, an alternative view on the Volterra series is established, which enables the utilization of certain modified linear iterative methods for linearization. For one particular linear iterative method, the Richardson iteration, the corresponding post-and pre-linearizers are discussed in detail. It is motivated that the resulting algorithm can be regarded as a generalization of some existing methods. Furthermore, a simply verifiable condition for convergence is presented, which allows the straightforward evaluation of applicability. The proposed method is demonstrated by means of the linearization of a time-varying nonlinear amplifier, which highlights its capability of linearizing significantly distorted signals, illustrates the advantageous convergence behavior, and depicts its robustness against modeling errors.

show abstract

Section: A Contributions and Outlinementioning

confidence: 99%

“…The post-linearizer for the Volterra systemĤn generates an output signal x[n] that corresponds to the response of the LTI filter L to the input signal u[n], cf (16)…”

mentioning

confidence: 99%

Linearization of Time-Varying Nonlinear Systems Using A Modified Linear Iterative Method

Hotz

Vogel

2014

IEEE Trans. Signal Process.

Self Cite

View full text Add to dashboard Cite

show abstract

“…the estimation error must be as low as possible. Several alternatives have been recently proposed to tackle the problem [14], [15]. For instance, signal processing can be performed in the digital domain, or in both analog and digital domains (mixed mode solutions) [6], [16].…”

Section: A State-of-the Art On Mismatch Compensationmentioning

confidence: 99%

Pilot-Based TI-ADC Mismatch Error Calibration for IR-UWB Receivers

et al. 2019

View full text Add to dashboard Cite

In this work, we first provide an overview of the state of the art in mismatch error estimation and correction for time-interleaved analog to digital converters (TI-ADCs). Then, we present a novel pilot-based on-line adaptive timing mismatch error estimation approach for TI-ADCs in the context of an impulse radio ultra wideband (IR-UWB) receiver with correlation-based detection. We introduce the developed method and derive the expressions for both additive white Gaussian noise (AWGN) and Rayleigh multipath fading (RMPF) channels. We also derive a lower bound on the required ADC resolution to attain a certain estimation precision. Simulations show the effectiveness of the technique when combined with an adequate compensator. We analyze the estimation error behavior as a function of signal to noise ratio (SNR) and investigate the ADC performance before and after compensation. While all mismatches combined cause the effective number of bits (ENOB) to drop to 3 bits and to 6 bits when considering only timing mismatch, estimation and correction of these errors with the proposed technique can restore a close to ideal behavior. We also show the performance loss at the receiver in terms of bit error rate (BER) and how compensation is able to significantly improve performance.

show abstract

“…However, due to some inherent defects (leading to offset, gain and timing-skew mismatches) in the system, the performance of TI-ADC is deteriorated seriously [5]. The solutions for correcting offset and gain mismatches are fairly straightforward, but the timing-skew still presents a challenge [6], [7]. It is more difficult to estimate as it depends on the input frequency.…”

Section: Introductionmentioning

confidence: 99%

A Background Correlation-Based Timing Skew Estimation Method for Time-Interleaved ADCs

Vogel

2021

IEEE Access

Self Cite

View full text Add to dashboard Cite

This paper presents a correlation-based all-digital background estimation method for timing skew mismatches in time-interleaved analog-to-digital converters (TI-ADCs). Exploiting the first-order approximation of an autocorrelation function of the digital output of each Sub-ADC, the timing skew mismatch between adjacent channels is identified, which can be used for analog or digital correction methods. The proposed estimation method has a low computation complexity and a simple implementation structure, because it basically only requires multiply-accumulate and average operations. In addition, the proposed method is not limited in the number of channels, does not need any pilot injection, is basically suitable for any bandlimited analog input signal, possess a large estimation range of mismatches and is immune against gain and offset mismatches to a certain extent. Simulation results of a four-channel TI-ADC behavioral model and measurement results from a commercial 12-bit 3.6-GS/s TI-ADC show the effectiveness and superiority of the proposed estimation method. INDEX TERMS Time-interleaved, ADC, timing skew, background calibration, correlation-based, estimation.

show abstract

A review on low-complexity structures and algorithms for the correction of mismatch errors in time-interleaved ADCs

Cited by 16 publications

References 27 publications

Linearization of Time-Varying Nonlinear Systems Using A Modified Linear Iterative Method

Linearization of Time-Varying Nonlinear Systems Using A Modified Linear Iterative Method

Pilot-Based TI-ADC Mismatch Error Calibration for IR-UWB Receivers

A Background Correlation-Based Timing Skew Estimation Method for Time-Interleaved ADCs

Contact Info

Product

Resources

About