A 0.96-mW dB-Linear Variable Gain Amplifier With 0.4-dB Linearity Error Over a 62.4-dB Gain Tuning Range

Cai, Liying; Lu, Zhenghao; Tang, Zhong; Yu, Xiaopeng

doi:10.1109/lssc.2022.3213055

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…The summary and a comparison of the proposed PGA with state-of-the-art PGAs are presented in Table I. For a fair comparison of the previously published PGAs with the proposed PGA, the figure-of-merit (FoM) is adapted from [23], [24] by considering the main performance parameters that are the distinct improvements in the novel PGA design discussed in this study such as dB-linear gain range, bandwidth, and power consumption by converting them to dB-scale. The defined FoM is shown in the footnote of Table I.…”

Section: Resultsmentioning

confidence: 99%

“…The VGA circuit topologies can be broadly classified into two categories based on the mode of gain tuning which are PGAs [7], [8], [9], [10], [11], [12], [13], [14], [15], [16] and analog-controlled VGAs [17], [18], [19], [20], [21], [22], [23], [24] . The most common technique used in the literature to achieve dB-linearity is through the pseudo-exponential behaviour of MOS transistors in the sub-threshold region.…”

Section: Introductionmentioning

confidence: 99%

“…a Relative error = Gain error / Gain range (dB/dB) (from[24]). b At maximum gain.c Bandwidth for oscilloscope load of 15 pF (measured).…”

mentioning

confidence: 99%

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Section: Resultsmentioning

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A variable gain amplifier (VGA) is an essential building block used in the automatic gain control (AGC) loop to provide a continuous, adjustable gain for the signal strength. To maintain the stability and consistency of the AGC loop, it is necessary to ensure that the gain of the VGA has an accurate dB‐linear characteristic. This tutorial provides a detailed overview of the development of dB‐linear VGAs based on differential pair structures over recent years. We categorize various VGA cells based on differential pair structures, analyze their operating principles, and explain the key features of each topology. Based on observation and extraction of the dB‐linear implementation schemes used by these VGAs, we summarize three basic methods for achieving dB‐linear gain control. We also discuss specific methods for realizing the exponential function, using a true exponential and a mathematical approximation, and present the different types of approximation functions adopted in the works described here. Considerations in regard to the tuning range, gain error, bandwidth, linearity, process‐temperature robustness, and circuit simplicity are also discussed. Finally, we draw comparisons and give perspectives for future dB‐linear VGAs.

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Dual-tuned high-swing variable-gain amplifier with enhanced dB-linear control

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A 0.96-mW dB-Linear Variable Gain Amplifier With 0.4-dB Linearity Error Over a 62.4-dB Gain Tuning Range

Cited by 4 publications

References 10 publications

A versatile programmable gain amplifier with wide dynamic range and low power consumption

A versatile programmable gain amplifier with wide dynamic range and low power consumption

Evolution of and Perspectives on Differential‐Pair‐Based CMOS Variable Gain Amplifiers With Linear‐in‐Decibel Gain Control: A Tutorial

Dual-tuned high-swing variable-gain amplifier with enhanced dB-linear control

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