A Low-Power CMOS Linear-in-Decibel Variable Gain Amplifier With Programmable Bandwidth and Stable Group Delay

Tsou, Shan-Chih; Li, Chin-Fu; Huang, Po-Chiun

doi:10.1109/tcsii.2006.885399

Cited by 50 publications

(8 citation statements)

References 10 publications

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“…For very low-voltage practical implementation (e.g. 0.5-V power supply), arrays of switched resistors can be utilized to tune resistors Rs and Rf [3,13]. Fig.…”

Section: Proposed Class-ab Variable Gain Amplifiermentioning

confidence: 99%

A low-voltage class-AB CMOS variable gain amplifier

Khumsat

Anantaseth

Isarasena

2007

2007 50th Midwest Symposium on Circuits and Systems

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A compact class-AB variable gain amplifier has been proposed. The amplifier structure is based on twostage architecture comprising a linear transconductor cascaded by a current amplifier-based feedback transimpedance amplifier. The major advantage of such VGA circuit is its ability to offer a good degree of signal linearity without sacrificing the original advantages of its predecessor on both aspects of the power consumption and circuit complexity. Superiority of the proposed VGA has been confirmed by circuit simulation employing 0.18µm standard CMOS technology in designing a 10-MHz VGA under 0.5V voltage supply with MOS's minimum threshold voltage of 0.43V while draining static power consumption less than 25µW.

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“…For very low-voltage practical implementation (e.g. 0.5-V power supply), arrays of switched resistors can be utilized to tune resistors Rs and Rf [3,13]. Fig.…”

Section: Proposed Class-ab Variable Gain Amplifiermentioning

confidence: 99%

A low-voltage class-AB CMOS variable gain amplifier

Khumsat

Anantaseth

Isarasena

2007

2007 50th Midwest Symposium on Circuits and Systems

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“…In most wireless communication receiver applications, such as Bluetooth, ZigBee, wireless local area networks (WLANs), ultra wideband (UWB), wireless body area networks (WBANs) and Global Positioning System (GPS), VGAs are indispensable blocks which accommodate the huge variations of the incoming signal power and provide a fixed voltage output, and therefore improve the dynamic range of the overall system [1][2][3][4]. Generally, wide dynamic range of the VGA with gain errors as small as possible is required in these applications.…”

Section: Introductionmentioning

confidence: 99%

A large dynamic‐range, high dB‐linearity VGA using switch arrays and second‐order mismatch‐shaping DEM technique

Yang

Shi

et al. 2015

Circuit Theory & Apps

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SUMMARYA new large dynamic-range variable gain amplifier (VGA) with improved dB linearity is presented. The traditional cascade VGA has the disadvantages of gain mismatch between sub-stages and difficulty of employing mismatch cancelation or suppression algorithms. In this paper, switch arrays were used to make the sub-stages or called gain cells in the coarse-tuning stage (CTS) work independently and therefore prevent the integral operation of the gain errors. Then, a second-order mismatch-shaping DEM was applied conveniently to the CTS and shown to be a useful design technique in improving the dB-linearity performance. The cascade VGA and its second-order mismatch-shaping DEM had been integrated in a 2.4-GHz receiver chip which was fabricated in a 0.18-μm CMOS technology with a supply voltage of 1.8 V. Measurement results showed that the gain errors were significantly reduced with second-order mismatch-shaping DEM with respect to the traditionally thermometric decoding over a temperature range of [À40, 80]°C.

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“…However, continuous gain control is mandatory in some applications such as orthogonal frequency-division multiplexing (OFDM), wideband code-division multiple access (WCDMA) or impulse radios [2,[9][10][11][12][13]. The constantbandwidth and linear-in-dB gain control characteristics are two important features of VGA that must be satisfied in order to preserve the constant settling time and delay group of AGC loop [14]. A VGA should also offer a large dynamic range along with a high linearity characteristic as well as an effective DC offset cancelling capability.…”

Section: Introductionmentioning

confidence: 99%

A 0.74 mW, linear-in-dB, constant bandwidth, variable gain amplifier based on zero-pole repositioning technique

Baghtash

2015

Analog Integr Circ Sig Process

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A zero-pole repositioning based variable gain amplifier is presented in this paper. The operational principle of this unique structure is discussed, its most important formulas are derived and its outstanding performance is verified by simulation in TSMC 0.18 lm standard CMOS technology. Owing to the cutting-edge structure, the proposed circuit demonstrates a very low power consumption of 0.74 mW and a wide tuning range of 83 dB. The proposed structure benefits from linear-in-dB and constant bandwidth specifications. The linear-in-dB gain range of structure is about 70 dB. The structure draws about 413 lA from 1.8 V power supply and regarding this low power consumption, it shows a lower and upper 3-dB cutoff frequencies of 8 Hz and 8.1 MHz, respectively. Process and temperature variation analysis of the circuit is also investigated through Monte Carlo and corner case analysis in order to verify the well-robustness of the structure. The transient sinusoidal response analysis is also done to verify the proposed VGA's stability.

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A Low-Power CMOS Linear-in-Decibel Variable Gain Amplifier With Programmable Bandwidth and Stable Group Delay

Cited by 50 publications

References 10 publications

A low-voltage class-AB CMOS variable gain amplifier

A low-voltage class-AB CMOS variable gain amplifier

A large dynamic‐range, high dB‐linearity VGA using switch arrays and second‐order mismatch‐shaping DEM technique

A 0.74 mW, linear-in-dB, constant bandwidth, variable gain amplifier based on zero-pole repositioning technique

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