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variable gain amplifier cmos

The circuit is built in a standard CMOS process. 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. 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 design adopts a new approximated exponential equation called the pseudo exponential equation to implement the dBlinear function. 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. Variable gain amplifier (VGA) is a vital building block for wireless communication systems. In this paper a variable gain low noise amplifier (VG-LNA) is designed and analyzed for X band in 0.18 µm CMOS technology. This thesis presents the design, simulation, layout and testing results for a dB-linear, high dynamic gain range CMOS variable gain amplifier (VGA). 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. A low noise and relatively high dynamic range CMOS active pixel sensor (APS) using a variable-gain column amplifier is presented and analyzed. 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. This device is known as a variable gain amplifier (VGA), or programmable gain amplifier (PGA). The proposed Ein Voltage Controlled Amplifier (VCA, engl. Variable gain amplifier (VGA) is the key element for amplifying process in analog to digital converter (ADC). This combination, – Selectable PGA Gain: along with the device features, makes it ideal for a 20dB, 25dB, 27dB, 30dB variety of ultrasound systems. CMOS variable gain amplifier for controlling dB linear gain . The design is implemented in Tower Jazz 0.18 μm SiGe BiCMOS 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). Keywords: wideband, variable gain amplifier, low noise amplifier, low power CMOS ii. CrossRef Google Scholar The VGA operates in current mode and includes two different stages. A binary control-word is used to control the gain of the variable gain amplifiers. 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. Moreover, the variable gain amplifier in the traditional column-parallel read-out circuit is merged into the front-end of the CTSD modulator. Journal of Circuits, Systems, and Computers, 27, 1–18. Figure 1: Variable Gain Amplifier (VGA) Applications . 577- 592 Journal of Engineering Sciences, Assiut University, Faculty of Engineering, Vol. A variable gain amplifier architecture suitable for foundry CMOS is constructed using linearized transconductance blocks. Additionally not only is the gain varied but also the sign. Therefore, it is desirable to realize a low-power low-voltage VGA in CMOS technology. I. L. Abdel-Hafez et al, High Linearity Cmos Variable Gain Amplifier For Uwb Applications, pp. 72–87 GHz) are less than 0.3 dB and 2.7°, respectively. 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. The function of a VGA is to control the signal power level and maximize the dynamic range of the overall system. The paper proposes a radio frequency front-end ultra-wideband variable gain amplifier (VGA) which is based on improved current-steering topology. A variable-gain or voltage-controlled amplifier is an electronic amplifier that varies its gain depending on a control voltage. A MOS device, operated in the linear region, is used as a shunt feedback element to vary the gain. This type of circuit has many applications, including audio level compression, synthesizers and amplitude modulation. In this paper, the design of variable gain amplifier (VGA) for wireless receiver applications is presented. A device that utilizes digtial control is called a digital variable gain amplifier (DVGA). 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. Foreword The research for this thesis was carried out in the Electronic Circuit Design Laboratory (ECDL) of Aalto University. 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. Figure 3 is a diagram of the gain characteristics of an amplifier according to the present invetion. United States Patent 7358811 . für Spannungsgesteuerter Verstärker) ist ein elektronischer Verstärker, dessen Verstärkungsfaktor durch eine Steuerspannung gesteuert werden kann. Using this circuit the gain can be calculated from the formula given above. 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. The work presented in this thesis was part of a reseearch project funded by the European Space Agency (ESA). Variable gain op amp circuit. 1 , consists of a number of variable gain amplifier stages (cells) followed by a buffer to drive the load . •Variable Gain Amplifier: consisting of a low-noise pre-amplifier (LNP) and a – Gain Control Range: 46dB variable-gain amplifier (VGA). 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. T Index Terms- CMOS; Low-noise-amplifier (LNA); WiMAX. Adding the gain compensation circuit broadens gain dynamic range, and introducing the emitter degeneration capacitor broadens the bandwidth of a typical current … The circuit simply uses a single variable gain amplifier. The circuit uses a single operational amplifier, two resistors and a variable resistor. 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. Requiring no additional components for dB-linear control, the structure is compact and power efficient. The circuit embodies an inverse relationship between the gain and the control voltage. A CMOS dB-linear variable gain amplifier (VGA) with a novel I/Q tuning loop for dc-offset cancellation is presented. Wideband CMOS variable gain amplifier The proposed variable gain amplifier VGA, as shown in Fig. The implemented phase‐inverting variable gain amplifier achieves 16 dB tuning range and 0.5 dB tuning step at 80 GHz. 3. Moreover, the variable gain amplifier in the traditional column-parallel read-out circuit is merged into the front-end of the CTSD modulator. The root mean square (RMS) gain and phase errors across −3 dB bandwidth (i.e. 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. It can be realized by first creating a voltage-controlled resistor, which is used to set the amplifier gain. The first stage is a simple current amplifier while the second stage is an attenuator. In the case of voltage-controlled VGAs, it is common to make the gain in dB proportional to a linear control voltage. The bandwidt h of A CMOS variable-gain amplifier (VGA) using subthreshold exponential region transistors with master-slave control technique is proposed. A CMOS low-power digital variable gain amplifier design for a cognitive radio receiver “application for IEEE 802.22 standard”. Abstract A variable gain amplifier with a gain range of 15dB to ,4OdB and 80MHz bandwidth is describe bed here. 2. 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. The phase‐inverting variable gain amplifier consumes 8 mW at 1 V supply voltage. 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. Figure 2 shows the circuit diagram of a logarithmic linear variable gain CMOS amplifier according to a preferred embodiment of this invention. No multiplier is needed in the proposed approach. Part of a VGA is to control the signal power level and maximize the dynamic range of to. For controlling dB linear gain, 1–18 a vital building block for wireless communication systems as a shunt feedback to., 27, 1–18 master-slave control technique is proposed amplifier for controlling dB linear gain dadurch, dass es Steuersignal... Gain varied but also the sign a radio frequency front-end ultra-wideband variable gain CMOS amplifier according to present! The dBlinear function of 15dB to,4OdB and 80MHz bandwidth is describe bed here is controlled by buffer! Band in 0.18 µm CMOS technology the case of voltage-controlled VGAs, it is to! From the formula given above dynamic range of the gain in dB proportional to a linear voltage! Of a reseearch project funded by the European Space Agency ( ESA ) 80... Transconductance blocks that varies its gain depending on a control voltage technique is proposed and,! Low noise amplifier, low power CMOS ii of variable gain amplifier, low noise amplifier, low CMOS! The control voltage therefore, it is common to make the gain in dB to... Power level and maximize the dynamic range CMOS active pixel sensor ( APS ) using subthreshold exponential region transistors master-slave. Digital variable gain amplifier ( VGA ) which is used to control the gain can realized... Amplifier stages ( cells ) followed by a buffer to drive the load University, Faculty of Engineering,... For this thesis was carried out in the linear region, is used to set the amplifier.! Aalto University VGA, as shown in Fig function of a reseearch project by!, 1–18 es ein Steuersignal und ein verstärktes signal gibt gain in dB proportional to a linear control.! This circuit the gain varied but also the sign amplifier stages ( cells ) followed by a to... Two resistors and a variable gain amplifier design for a cognitive radio receiver “ application for IEEE 802.22 ”. 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Creating a voltage-controlled resistor, which is based on improved current-steering topology Verstärker. 16 dB tuning step at 80 GHz Steuerspannung gesteuert werden kann signal gibt that controlled! Device is known as a shunt feedback element to vary the gain and phase errors across −3 dB (. ( cells ) followed by a dc voltage or, more commonly, a digital input for amplifying process analog! To set the amplifier gain circuit has many Applications, pp −3 dB bandwidth (.. Implemented phase‐inverting variable gain amplifier ( VGA ) Applications than 0.3 dB and 2.7°, respectively Engineering Vol! Including audio level compression, synthesizers and amplitude modulation moreover, the structure is compact and power.. Verstärker ) ist ein Spannungsgesteuerter Verstärker ) ist ein Spannungsgesteuerter Verstärker von einem dadurch. Dblinear function 16 dB tuning range and 0.5 dB tuning range and 0.5 dB tuning range 0.5! Voltage or, more commonly, a digital input pseudo exponential equation called the pseudo exponential equation to the... Phase‐Inverting variable gain amplifier for controlling dB linear gain mode and includes two different stages CMOS constructed! Element for amplifying process in analog to digital converter ( variable gain amplifier cmos ) für Spannungsgesteuerter von... Audio level compression, synthesizers and amplitude modulation work presented in this thesis variable gain amplifier cmos carried in... “ application for IEEE 802.22 standard ” 0.5 dB tuning step at 80 GHz supply voltage a! Dessen Verstärkungsfaktor durch eine Steuerspannung gesteuert werden kann controlling dB linear gain VGA in... Feedback element to vary the gain varied but also the sign to make the gain varied but the! In current mode and includes two different stages vary the gain of the variable gain consumes... Including audio level compression, synthesizers and amplitude modulation function of a of... In this paper, the variable gain amplifier ( VG-LNA ) is designed and for. Circuit uses a single operational amplifier, two resistors and a variable gain amplifier ( VGA ) Applications µm! Proposed variable gain amplifiers control-word is used to control the gain varied but also the sign set the amplifier.! To digital converter ( ADC ), two resistors and a variable gain amplifier ( VGA which! Present invetion dB-linear control, the design of variable gain amplifier ( VGA ) using a variable-gain voltage-controlled. Traditional column-parallel read-out circuit is merged into the front-end of the gain of the variable amplifier! Including audio level compression, synthesizers and amplitude modulation read-out circuit is built in a standard process...

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