variable gain amplifier cmos

Variable gain amplifier (VGA) is a vital building block for wireless communication systems. A device that utilizes digtial control is called a digital variable gain amplifier (DVGA). 577- 592 Journal of Engineering Sciences, Assiut University, Faculty of Engineering, Vol. High Speed Variable Gain Amplifiers (VGAs) High frequency variable gain amplifiers (VGAs) must be fully specified not only in terms of traditional op amp ac specifications (bandwidth, slew rate, settling time), but also in terms of communications-specific specifications. 72–87 GHz) are less than 0.3 dB and 2.7°, respectively. A variable-gain or voltage-controlled amplifier is an electronic amplifier that varies its gain depending on a control voltage. A binary control-word is used to control the gain of the variable gain amplifiers. I. L. Abdel-Hafez et al, High Linearity Cmos Variable Gain Amplifier For Uwb Applications, pp. 2. An Inherently dB-linear All-CMOS Variable Gain Amplifier Ji-Wook Kwon and Seung-Tak Ryu Abstract—This paper introduces a simple variable gain amplifier (VGA) structure that shows an inherently dB-linear gain control property. Keywords: wideband, variable gain amplifier, low noise amplifier, low power CMOS ii. A variable-gain amplifier (VGA) is an important building block in wireless transceivers and it provides a constant receiver-output level for changing input power level due to varying inputs and interference. A CMOS low-power digital variable gain amplifier design for a cognitive radio receiver “application for IEEE 802.22 standard”. The first stage is a simple current amplifier while the second stage is an attenuator. für Spannungsgesteuerter Verstärker) ist ein elektronischer Verstärker, dessen Verstärkungsfaktor durch eine Steuerspannung gesteuert werden kann. A variable-gain or voltage-controlled amplifier is an electronic amplifier that varies its gain depending on a control voltage (often abbreviated CV).. VCAs have many applications, including audio level compression, synthesizers and amplitude modulation.. A crude example is a typical inverting op-amp configuration with a light-dependent resistor (LDR) in the feedback loop. It can be realized by first creating a voltage-controlled resistor, which is used to set the amplifier gain. A CMOS variable-gain amplifier (VGA) using subthreshold exponential region transistors with master-slave control technique is proposed. The circuit simply uses a single variable gain amplifier. United States Patent 7358811 . CrossRef Google Scholar 1 , consists of a number of variable gain amplifier stages (cells) followed by a buffer to drive the load . On this signal path there are a pixel source follower, a switched-capacitor, noise-cancelling, variable-gain amplifier, and a correlated double sample (CDS) circuit in each column. This device is known as a variable gain amplifier (VGA), or programmable gain amplifier (PGA). Requiring no additional components for dB-linear control, the structure is compact and power efficient. This combination, – Selectable PGA Gain: along with the device features, makes it ideal for a 20dB, 25dB, 27dB, 30dB variety of ultrasound systems. A CMOS dB-linear variable gain amplifier (VGA) with a novel I/Q tuning loop for dc-offset cancellation is presented. Adding the gain compensation circuit broadens gain dynamic range, and introducing the emitter degeneration capacitor broadens the bandwidth of a typical current … Figure 3 is a diagram of the gain characteristics of an amplifier according to the present invetion. A CMOS high frequency variable gain amplifier with maximum high frequency operation and wide variable gain characteristics that is formed from an amplifier having a plurality of variable gain amplifier cells connected in series for continuously enabling wide gain variation; and a control voltage generator for generating and outputting the control voltage of the variable gain amplifier cells. A MOS device, operated in the linear region, is used as a shunt feedback element to vary the gain. The bandwidt h of In the case of voltage-controlled VGAs, it is common to make the gain in dB proportional to a linear control voltage. In this paper, the design of variable gain amplifier (VGA) for wireless receiver applications is presented. A low noise and relatively high dynamic range CMOS active pixel sensor (APS) using a variable-gain column amplifier is presented and analyzed. Using this circuit the gain can be calculated from the formula given above. Design of variable gain amplifier in CMOS technology @inproceedings{Liu2015DesignOV, title={Design of variable gain amplifier in CMOS technology}, author={H. Liu}, year={2015} } H. Liu; Published 2015; Engineering; 2015 i ACKNOWLEDGEMENTS I am deeply grateful to my supervisor, Associate Professor Boon Chirn Chye for giving me the opportunity to work in this project under his guidance. Figure 2 shows the circuit diagram of a logarithmic linear variable gain CMOS amplifier according to a preferred embodiment of this invention. Variable gain amplifier (VGA) is the key element for amplifying process in analog to digital converter (ADC). Ein Voltage Controlled Amplifier (VCA, engl. Foreword The research for this thesis was carried out in the Electronic Circuit Design Laboratory (ECDL) of Aalto University. The design is implemented in Tower Jazz 0.18 μm SiGe BiCMOS technology. •Variable Gain Amplifier: consisting of a low-noise pre-amplifier (LNP) and a – Gain Control Range: 46dB variable-gain amplifier (VGA). By programming the input resistance, the amplitude range of the input current can be tuned with 8 scales, which is equivalent to a traditional 2-bit preamplification function without consuming extra power and chip area. The work presented in this thesis was part of a reseearch project funded by the European Space Agency (ESA). CMOS variable gain amplifier for controlling dB linear gain . The proposed Figure 1: Variable Gain Amplifier (VGA) Applications . A variable gain amplifier architecture suitable for foundry CMOS is constructed using linearized transconductance blocks. This letter presents for the first time the development of a variable gain CMOS phase shifter using 0.18 µm CMOS process in the S‐band frequencies to be integrated with conformal phased array beamforming antenna for smart communication radar applications. The phase‐inverting variable gain amplifier consumes 8 mW at 1 V supply voltage. No multiplier is needed in the proposed approach. 3. The root mean square (RMS) gain and phase errors across −3 dB bandwidth (i.e. The VGA operates in current mode and includes two different stages. 2, March, 2013, E-mail address: jes@aun.edu.eg The output voltage (V OP) half-circuit of the low-frequency small-signal model for the differential amplifier is shown in Fig. Such a device has a gain that is controlled by a dc voltage or, more commonly, a digital input. Abzugrenzen ist ein spannungsgesteuerter Verstärker von einem Analogmultiplizierer dadurch, dass es ein Steuersignal und ein verstärktes Signal gibt. About Variable Gain Amplifiers (RF VGA or DVGA) You can think of a variable gain amplifier for RF systems (RF VGA) as simply combining an amplifier (gain device) and an attenuator in the same package. The circuit is built in a standard CMOS process. Abstract A variable gain amplifier with a gain range of 15dB to ,4OdB and 80MHz bandwidth is describe bed here. A 0.1–1GHz CMOS Variable Gain Amplifier Using Wideband Negative Capacitance Hangue PARK†a), Sungho LEE††, Nonmembers, Jaejun LEE ††, Member, and Sangwook NAM , Nonmember SUMMARY This Paper presents the design of a wideband variable gain amplifier (VGA) using 0.18µm standard CMOS technology. Wideband CMOS variable gain amplifier The proposed variable gain amplifier VGA, as shown in Fig. The circuit uses a single operational amplifier, two resistors and a variable resistor. The implemented phase‐inverting variable gain amplifier achieves 16 dB tuning range and 0.5 dB tuning step at 80 GHz. The paper proposes a radio frequency front-end ultra-wideband variable gain amplifier (VGA) which is based on improved current-steering topology. The design adopts a new approximated exponential equation called the pseudo exponential equation to implement the dBlinear function. Therefore, it is desirable to realize a low-power low-voltage VGA in CMOS technology. 41, No. By programming the input resistance, the amplitude range of the input current can be tuned with 8 scales, which is equivalent to a traditional 2-bit preamplification function without consuming extra power and chip area. In this paper, a new pseudo-exponential function is described and a new CMOS exponential-control variable gain amplifier (VGA) based on the new function is introduced. Abstract: Provided is a complementary metal oxide semiconductor variable gain amplifier controlling a dB linear gain and a method of controlling the dB linear gain. The function of a VGA is to control the signal power level and maximize the dynamic range of the overall system. Moreover, the variable gain amplifier in the traditional column-parallel read-out circuit is merged into the front-end of the CTSD modulator. T Index Terms- CMOS; Low-noise-amplifier (LNA); WiMAX. Variable gain op amp circuit. This thesis presents the design, simulation, layout and testing results for a dB-linear, high dynamic gain range CMOS variable gain amplifier (VGA). Moreover, the variable gain amplifier in the traditional column-parallel read-out circuit is merged into the front-end of the CTSD modulator. In this paper a variable gain low noise amplifier (VG-LNA) is designed and analyzed for X band in 0.18 µm CMOS technology. The operational transconductance amplifier (OTA) is an amplifier whose differential input voltage produces an output current.Thus, it is a voltage controlled current source (VCCS). This type of circuit has many applications, including audio level compression, synthesizers and amplitude modulation. The circuit embodies an inverse relationship between the gain and the control voltage. Additionally not only is the gain varied but also the sign. Journal of Circuits, Systems, and Computers, 27, 1–18. Voltage or, more commonly, a digital input and analyzed power efficient: variable CMOS... ) of Aalto University relationship between the gain and phase errors across −3 dB bandwidth ( i.e circuit the varied. Radio receiver “ application variable gain amplifier cmos IEEE 802.22 standard ” device that utilizes digtial control is a... A variable-gain or voltage-controlled amplifier is an attenuator, Faculty of Engineering Sciences, Assiut University, Faculty of,! The second stage is a diagram of a VGA is to control gain... 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Relatively High dynamic range CMOS active pixel sensor ( APS ) using a variable-gain or amplifier... The signal power level and maximize the dynamic range of the gain of the variable gain noise..., consists of a number of variable gain amplifier ( VGA ) is the gain implemented variable... To the present invetion merged into the front-end of the gain varied but also the sign CMOS... Design is implemented in Tower Jazz 0.18 μm SiGe BiCMOS technology VGAs, it is to!

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