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Why AC amplifiers are used in demodulation process? 

Fiber Bragg grating
Phasor
Amplifier
Demodulation
Frequency band

Answers from top 8 papers

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Papers (8)Insight
Journal Article•DOI
Two-dimensional differential demodulation for OFDM
E. Haas, S. Kaiser 
21 May 2003-IEEE Transactions on Communications
22 Citations
Nevertheless, it is shown that it can be used for the two-dimensional demodulation process without changing the transmitter.
Proceedings Article•DOI
Digital lock-in amplifier for precision audio frequency bridge
Ze Liu, Lixiong Zhu, Andrew Koffman, Bryan C. Waltrip, Yicheng Wang 
01 Jul 2012
9 Citations
The advantage of this design is that the demodulation algorithm can be flexibly reconfigured when the imbalance signal changes in the AC bridge system.
Journal Article•DOI
Delay Compensated FBG Demodulation System Based on Fourier Domain Mode-Locked Lasers
Jia-Wei Mei, Xiaosheng Xiao, Changxi Yang 
01 Aug 2015-IEEE Photonics Technology Letters
20 Citations
Experimental results show that this demodulation method is efficient and accurate.
Proceedings Article•DOI
About the demodulation of PWM-signals with applications to audio amplifiers
H. Bresch, M. Streitenberger, Wolfgang Mathis 
31 May 1998
10 Citations
Therefore the importance of the matching between modulation and demodulation is demonstrated by simulation.
Journal Article•DOI
Frequency estimation by demodulation of two complex signals
Magnus Akke
01 Jan 1997-IEEE Power & Energy Magazine
145 Citations
The advantage of this method is that the demodulation does not introduce a double frequency component.
Journal Article•DOI
Obtaining polynomial coefficients from intercept points of RF power amplifiers
Xiao Li, Chunming Liu, Y. Xu, Fu Li 
13 Sep 2012-Electronics Letters
12 Citations
This result could be used for the design of power amplifiers or predistorters.
Open access•Journal Article•DOI
Improved Reactance-Compensation Technique for the Design of Wideband Suboptimum Class-E Power Amplifiers
Jiafeng Zhou, Kevin A. Morris, Gavin T. Watkins, Keiichi Yamaguchi 
27 Jul 2015-IEEE Transactions on Microwave Theory and Techniques
26 Citations
The proposed method can be used in the design of many other types of amplifiers.
Journal Article•DOI
Low Distortion Switching Amplifier With Discrete-Time Click Modulation
Leandro Stefanazzi, Fernando Chierchie, Eduardo E. Paolini, A.R. Oliva 
01 Jul 2014-IEEE Transactions on Industrial Electronics
12 Citations
The reduction of the switching frequency provides more flexibility for the design of the demodulation stage allowing to trade off between the complexity of the demodulation filter and the achievable efficiency of the switching stage.

Related Questions

Literature reviews on how does an amplifier works?3 answersAn amplifier is a device that increases the amplitude of an input signal to produce a larger output signal. Different types of amplifiers have been developed using various technologies such as Complementary to Metal Oxide Semiconductor (CMOS), Gallium Nitride Monolithic Microwave integrated circuit (GaN MMIC), Gallium Nitride high electron mobility transistor Doherty (GaN HEMT Doherty), Aluminum Gallium Nitride (AlGaN), high electron-mobility transistor (HEMT), Gallium Nitride Metal Semiconductor Field Effect Transistor (GaN MESFET), Silicon Carbide Metal Semiconductor Field Effect Transistor (SiC MESFET), BiCMOS, Metal Oxide Semiconductor (MOS), BiFET, and Gallium Arsenide Pseudomorphic (GaAsP) HEMT. These amplifiers have been used in various applications such as Global System for Mobile Communications (GSM), Enhanced data for global evolution (EDGE), successive approximation, analog-to-digital converter (ADC), flash analog-to-digital converter (ADC), comparator, voltage-controlled oscillator (VCO), and mixer circuits. However, existing literature on power amplifiers has identified several issues that need to be addressed. The amplifier structure typically consists of a voltage source, first amplifying unit, and second amplifying unit. The first amplifying unit amplifies the input signals to generate a first amplified signal, while the second amplifying unit amplifies the input signals to generate a second amplified signal. The output signal is then generated based on the first and second amplified signals. An amplifier also includes a biasing unit, amplifying unit, and Schmitt trigger. The biasing unit generates a bias current independent of the power supply to increase power supply rejection ratio. The amplifying unit receives an input voltage and generates an amplified voltage based on the biasing current. The Schmitt trigger generates and outputs a modified voltage. An amplifier circuit consists of a first series circuit, a second series circuit, and an amplifier stage. The first series circuit includes a current source, a first tap, and a first component configured as a diode. The second series circuit includes a controlled path between a first connection and a second connection of a first transistor and a second tap. The amplifier stage is coupled to the second tap to set the operating point of the amplifier stage.
What are the applications of amplifiers?5 answersAmplifiers have various applications in different industries and fields. They are commonly used in radio-frequency applications, where power amplifiers are implemented on a semiconductor substrate to operate with high voltage and coupled to an output filter for specific frequency bands. In signal receiving circuits, amplifiers are used to enhance the quality of the received signal by reducing interferences and improving the signal-to-noise ratio. In medical equipment, operational amplifiers (op-amps) with adjustable bandwidth are used for signal processing in areas such as EEG, ECG, EMG, PCG, and Aps usage. Amplifiers are also utilized in instrumentation to improve the strength and resolution of signals in devices like TVs, DVRs, computer monitors, set-top boxes, and surveillance cameras. Additionally, power amplifiers play a crucial role in modern radar and telecommunication equipment, boosting radio signals for wired or wireless transmission, although their efficiency and linearity are important factors to consider.
How do you use a mixer amplifier?19 answers
What is amplifier in AVR?9 answers
Where are CE amplifiers used?10 answers
Which amplifier is used in DAC?10 answers

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