A Novel Circuit Design of the Wideband VGA in CMOS

2014 ◽  
Vol 1049-1050 ◽  
pp. 682-686
Author(s):  
Yu Yang Liu
Keyword(s):  
Circuit Design ◽  
Temperature Compensation ◽  
Noise Figure ◽  
Ultra Wideband ◽  
Effect Of Temperature ◽  
Variable Gain Amplifier ◽  
Compensation Circuit ◽  
Variable Gain ◽  
The Core ◽  
Two Stages

In this paper, a wideband variable-gain amplifier (VGA) in CMOS for ultra wideband (UWB) system is designed. The operation frequency of the VGA is 4.2-4.8GHz, and the gain is continuously adjustable between 0 and 30dB. Cascaded Cherry-Hooper with two stages is adopted as the core unit of the VGA, and a temperature compensation circuit is used to reduce the effect of temperature on the performance of the system. The simulation shows that the temperature compensation circuit can compensate the effect of the temperature very well, and the noise figure of the wideband VGA can meet the requirements of the system.

scholarly journals An E-Band 21-dB Variable-Gain Amplifier with 0.5-V Supply in 40-nm CMOS

Electronics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 804
Author(s):  
Gibeom Shin ◽  
Kyunghwan Kim ◽  
Kangseop Lee ◽  
Hyun-Hak Jeong ◽  
Ho-Jin Song
Keyword(s):  
Power Consumption ◽  
Frequency Band ◽  
Noise Figure ◽  
Complementary Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Operating Frequency ◽  
Variable Gain Amplifier ◽  
Variable Gain ◽  
Operating Frequency Band ◽  
Shunt Capacitors

This paper presents a variable-gain amplifier (VGA) in the 68–78 GHz range. To reduce DC power consumption, the drain voltage was set to 0.5 V with competitive performance in the gain and the noise figure. High-Q shunt capacitors were employed at the gate terminal of the core transistors to move input matching points for easy matching with a compact transformer. The four stages amplifier fabricated in 40-nm bulk complementary metal oxide semiconductor (CMOS) showed a peak gain of 24.5 dB at 71.3 GHz and 3‑dB bandwidth of more than 10 GHz in 68–78 GHz range with approximately 4.8-mW power consumption per stage. Gate-bias control of the second stage in which feedback capacitances were neutralized with cross-coupled capacitors allowed us to vary the gain by around 21 dB in the operating frequency band. The noise figure was estimated to be better than 5.9 dB in the operating frequency band from the full electromagnetic (EM) simulation.

An Advanced Traveling Wave Matching Network for DC-12GHz Variable Gain Amplifier Design

2013 ◽  
Vol 321-324 ◽  
pp. 331-335
Author(s):  
Shan Wen Hu ◽  
Tao Chen ◽  
Huai Gao ◽  
Long Xing Shi ◽  
G.P. Li
Keyword(s):  
Traveling Wave ◽  
Noise Figure ◽  
Gain Control ◽  
Wide Band ◽  
Variable Gain Amplifier ◽  
Control Voltage ◽  
Variable Gain ◽  
Input Matching ◽  
Amplifier Design ◽  
Wave Matching

A traveling wave matching (TWM) network is proposed for broadband variable gain amplifier design. The TWM network lessens input return loss and noise figure dependence on VGA’s gain, which is adjusted by biasing of the gain control circuit. A wide band (DC to 12 GHz) VGA with the novel TWM network as input matching is implemented in 2μm InGaP/GaAs HBT (fT of 29.5GHz) technology with die size of 1×2 mm2. As gain control voltage sweeps, the VGA shows a gain tuned from -15 dB to 15 dB and an average noise figure ranging from 8dB to 6.5dB, while S11 (lower than -20dB) and S22 (lower than -10dB) almost unchanged over the operation frequency band.

scholarly journals 1–30 GHz ultra-wideband low noise amplifier with on-chip temperature-compensation circuit

2018 ◽  
Vol 15 (20) ◽  
pp. 20180804-20180804 ◽  
Author(s):  
Lin Yang ◽  
Lin-An Yang ◽  
Taotao Rong ◽  
Zhi Jin ◽  
Yue Hao
Keyword(s):  
Temperature Compensation ◽  
Low Noise ◽  
Low Noise Amplifier ◽  
Ultra Wideband ◽  
Compensation Circuit ◽  
Chip Temperature ◽  
Noise Amplifier ◽  
On Chip

A WIDEBAND CMOS CASCADED VARIABLE GAIN AMPLIFIER USING UNEQUALLY DISTRIBUTED GAIN CONTROL FOR DVB-S.2 RECEIVER

2013 ◽  
Vol 22 (09) ◽  
pp. 1340008 ◽  
Author(s):  
HYEONSEOK HWANG ◽  
HOONKI KIM ◽  
CHAN-HUI JEONG ◽  
CHAN-KEUN KWON ◽  
SANGGEUN JEON ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Noise Figure ◽  
Gain Control ◽  
Cmos Technology ◽  
Variable Gain Amplifier ◽  
Control Voltage ◽  
Current Generation ◽  
Fully Integrated ◽  
Variable Gain ◽  
Current Converter

A fully integrated three stage cascaded radio frequency variable gain amplifier (RFVGA) linearly controlled by exponential current generation circuit is presented. The gain control is unequally distributed in each stage for noise figure (NF) and linearity performance. The dB-linear gain control is realized using pseudo exponential current generated by CMOS current summing circuit with a voltage to current converter. The RFVGA has over 50 dB dynamic range. Gain changes from -38.5 to 16.8 dB according to control voltage that varies from 0.5 to 1.8 V. It operates at 0.95–2.15 GHz. This design is implemented in 0.18 μm CMOS technology.

A NOVEL LOW-VOLTAGE CMOS VARIABLE GAIN AMPLIFIER WITH GAIN-INDEPENDENT INPUT IMPEDANCE MATCHING FOR DTV TUNING APPLICATIONS

2009 ◽  
Vol 18 (06) ◽  
pp. 1119-1136 ◽  
Author(s):  
S. M. REZAUL HASAN
Keyword(s):  
Frequency Band ◽  
Low Voltage ◽  
Noise Figure ◽  
Supply Voltage ◽  
Impedance Matching ◽  
Variable Gain Amplifier ◽  
Control Voltage ◽  
Cmos Process ◽  
Process Technology ◽  
Variable Gain

This paper presents a novel low-voltage single stage CMOS RF Variable Gain Amplifier (RFVGA) designed in 130 nm IBM CMOS process technology using current feed-back gain-independent impedance matching. The proposed RFVGA has a nearly constant gain over the 400 MHz–1 GHz frequency band. Also, it has a 70 dB gain variation (-40 dB to 30 dB) which is decibel-linear within this frequency band for a control voltage in the range of 0.41 V–0.81 V. The RFVGA demonstrates high linearity (THD ≈ -60 dB) and noise immunity (average Noise Figure ≤ 6 dB). It has an input referred third-order intercept point (IIP3) of -1.5 dBm, and an input reflection coefficient (S11) under -8 dB within the frequency band of interest. Also, it dissipates around 5 mW using a 1.2 V power supply. Further, Monte Carlo simulations incorporating process, supply voltage and temperature variations (PVT variations) as well as mismatch between devices (based on width and length of devices) indicate that the design is quite robust. The proposed RFVGA is highly suitable for mobile digital television (DTV) tuner applications.

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