A highly linear 125-mhz cmos switched-resistor programmable-gain amplifier

Hsu, Ching-Ting; Wu, Jieh-Tsorng

doi:10.1109/jssc.2003.817665

Cited by 96 publications

(3 citation statements)

References 16 publications

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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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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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“…The linearity and good noise performance of PGAs are proven in CMOS Processes. 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].…”

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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“…That means when the depth of penetration is changed from deep layer to surface, gain attenuation should be provided by the receiver to avoid saturation considering the input range of the ADC. 5 A VCAT could be adopted for this purpose, and meanwhile, good linearity-in-dB attenuation of the VCAT should be achieved since the linearity of the attenuation curve usually determines the resolution that can be achieved in the gain control. 6,7 If the slope of the attenuation curve is very high, small variations in the control voltage will lead to large variations in the gain, and if the slope is very low, large variations of the control voltage could only lead to very small variations of the attenuation.…”

mentioning

confidence: 99%

A large dynamic range voltage controlled attenuator with improved linearity‐in‐dB for ultrasound applications

Fei

et al. 2019

Circuit Theory & Apps

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Summary A large dynamic range (DR) and high linearity‐in‐dB voltage controlled attenuator (VCAT) for ultrasound applications was presented. Continuous tunable VCAT implemented with Metal‐Oxide‐Semiconductor (MOS) transistors used as shunt devices was proposed in this work, and the linearity‐in‐dB performance was analyzed in detail. Nonlinearity of the shunt transistors operated in different regions resulted in poor linearity‐in‐dB attenuation of the VCAT, which was undesirable in an ultrasonic receiver system. An effective linearity‐in‐dB improvement scheme was then proposed. The full scale range of the input control voltage was divided into N intervals with a same equal‐length by uniformly distributed voltage values. At these division voltages, the attenuation gains were corrected to be the ideal ones by the tracing and comparing circuits. In this way, the non‐linearity‐in‐dB was limited to the intervals between the two adjacent corrected attenuation gains, and the overall linearity of the VCAT was improved greatly. Measurement results showed that the dynamic range of the proposed attenuator was 36‐dB, and the gain errors were in a range from −1.22 to −0.55 dB. The noise figures (NF) at the commonly used ultrasonic frequencies was below 6‐dB, and the S11 was better than −10 dB over the input range of the control voltage.

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A highly linear 125-mhz cmos switched-resistor programmable-gain amplifier

Cited by 96 publications

References 16 publications

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

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

A large dynamic range voltage controlled attenuator with improved linearity‐in‐dB for ultrasound applications

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