A Wideband Analog-Controlled Variable-Gain Amplifier With dB-Linear Characteristic for High-Frequency Applications

Liu, Hang; Boon, Chirn Chye; He, Xiaofeng; Zhu, Xi; Yi, Xiaoke; Kong, Lingshan; Heimlich, Michael

doi:10.1109/tmtt.2015.2513403

Cited by 73 publications

(25 citation statements)

References 15 publications

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“…The measurement results for maximum gain settings (I 01 = 600 µA and I 02 = 50 µA) are plotted in Figure 13, obtaining a value of -20.18 dBm for the input P 1dB . A summary of the performance of the proposed RF-VGA versus I 02 is presented in Table 1 for I 01 = 550 µA and V DC = ±1.5 V. A brief overview of similar works available in the literature is given in Table 2 [23][24][25][26][27][28][29][30]. With the exception of [26], which uses 40 nm technology, our work has better bandwidth.…”

Section: Measurementsmentioning

confidence: 99%

A Compact Size Wideband RF-VGA Based on Second Generation Controlled Current Conveyors

et al. 2020

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This paper presents a methodology to design a wideband radio frequency variable gain amplifier (RF-VGA) in a low-cost SiGe BiCMOS 0.35 μm process. The circuit uses two Class A amplifiers based on second-generation controlled current conveyors (CCCII). The main feature of this circuit is the wideband input match along with a reduced NF (5.5–9.6 dB) and, to the authors’ knowledge, the lowest die footprint reported (62 × 44 μm2 area). The implementation of the RF-VGA based on CCCII allows a wideband input match without the need of passive elements. Due to the nature of the circuit, when the gain is increased, the power consumption is reduced. The architecture is suitable for designing wideband, low-power, and low-noise amplifiers. The proposed design achieves a tunable gain of 6.7–18 dB and a power consumption of 1.7 mA with a ±1.5 V DC supply. At maximum gain, the proposed RF-VGA covers from DC up to 1 GHz and can find application in software design radios (SDRs), the low frequency medical implant communication system (MICS) or industrial, scientific, and medical (ISM) bands.

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Section: Measurementsmentioning

confidence: 99%

A Compact Size Wideband RF-VGA Based on Second Generation Controlled Current Conveyors

et al. 2020

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“…Considering that the coefficients in (25) as well as |I' error | 4 and |I' error | 2 are less than one, we can ignore the mismatch of transconductance parameters. The Monte Carlo analysis is also carried out for this parameter in variation of aspect ratio of the transistors (considering K = 0.5μ 0 C OX (W/L)).…”

Section: Error Analysis In the Circuitsmentioning

confidence: 99%

“…In order to show the applicability of the proposed EXP circuit, it is used to realize a dB-linear variablegain amplifier (VGA) shown in Fig. 15, an important application in radio engineering field [25], [26]. The proposed VGA employs the exponential characteristic realized in Fig.…”

Section: Number Of Samplesmentioning

confidence: 99%

Wide Range High Precision CMOS Exponential Circuit Based on Linear Least Squares Approach

Saatlo¹,

Özoğuz²

2018

RADIOENGINEERING

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A new strategy to implement exponential circuit in CMOS technology is presented in this paper. The proposed method is based on the new approximation function optimized by linear least squares approach to extend the output dynamic range. The current mode method is employed for realization of circuits, because of simple circuitry and intuitive topology. Unlike to the some reported circuits which were designed in the subthreshold region, the proposed design operates in the saturation region which provides acceptable bandwidth for the circuit. In order to validate the circuit performance, the post layout simulation results are presented using HSPICE and Cadence with TSMC level 49 (BSIM3v3) parameters for 0.18 μm CMOS technology. The results demonstrate 78 dB output dynamic range with the linearity error less than ±0.5 dB which shows a remarkable improvement in comparison with previously reported works. A bandwidth of 67 MHz, maximum power consumption of 0.326 mW under supply voltage of 1.5 V, and 0.77% error for temperature variations are further achievement of the design.

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“…Wireless communications traffic demand is expected to increase by more than 1000-fold in the next decade. To serve this ever-increasing demand, it is of great interest for RF designers to design integrated circuits that are more power/energy efficient with smaller footprint and lower implementation cost [1]- [3]. Since it contains both analogue and digital circuitry, the integration of RF, analogue and baseband in a single chip has always been a critical challenge [4].…”

Section: Introductionmentioning

confidence: 99%

Quadrature broadband phase shift generation using passive RC polyphase filter for RF front-end

Dutkiewicz

Huang

Nguyen

et al. 2016

2016 16th International Symposium on Communications and Information Technologies (ISCIT)

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This paper reviews the state of art of a polyphase complex filter for RF front-end low-IF transceivers applications. We then propose a multi-stage polyphase filter design to generate a quadrature I/Q signal to achieve a wideband precision quadrature phase shift with a constant 90 ° phase difference for self-interference cancellation circuit for full duplex radio. The number of the stages determines the bandwidth requirement of the channel. An increase of 87% in bandwidth is attained when our design is implemented in multi-stage from 2 to an extended 6 stages. A 4-stage polyphase filter achieves 2.3 GHz bandwidth.

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A Wideband Analog-Controlled Variable-Gain Amplifier With dB-Linear Characteristic for High-Frequency Applications

Cited by 73 publications

References 15 publications

A Compact Size Wideband RF-VGA Based on Second Generation Controlled Current Conveyors

A Compact Size Wideband RF-VGA Based on Second Generation Controlled Current Conveyors

Wide Range High Precision CMOS Exponential Circuit Based on Linear Least Squares Approach

Quadrature broadband phase shift generation using passive RC polyphase filter for RF front-end

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