The front-end transmit/receive switch circuit is one of the essential elements in modern wireless handsets. The main function of the transmit/receive switch is switch the antenna either to the transmitter or the receiver. It must have high isolation in order to avoid the RF-power of the transmitter (PA) turning on the receiver (LNA), resulting in high loss or in the worst case damage. Low inser...

150104-8686-IJECS-IJENS © August 2015 IJENS I J E N S  Abstract— In this paper, a dual-band, multi-standard, concurrent, low noise amplifier operating in the 2.45/5.25 GHz bands is presented. The amplifier design is based on an ultra low noise PHEMT transistor connected in the common source configuration with inductive degeneration. The proposed amplifier stability is ensured using a series ga...

The new generation mobile communication systems are very sensitive to the nonlinearities in their transmitting paths. The power amplifier is a key component which generates the nonlinear distortions. Power amplifier linearization techniques are very important to reduce the distortion of the transmitted signal and the adjacent band interference of users. As its facility of implementation, adapti...

This paper describes a power amplifier, employing parallel-connected laterally diffused metal–oxide semiconductor (LDMOS) devices with optimized channel widths and bias offsets to approximate ideal square-law behavior of the overall transconductance in class-AB operation. The proposed method results in a significant linearity improvement over a large dynamic range in comparison to a conventiona...

A novel Nd:YVO4−based regenerative amplifier system operating in the picosecond regime featuring a volume Bragg grating (VBG) as an intracavity spectral narrowing element is described. This compact amplifier provides pulses with duration of ∼85 ps operating at repetition rates ranging from single shot to 10 kHz. The VBG is used to passively tailor the pulse duration and achieve transformlimited...

Radio Frequency Power Amplifier (RFPA) amplifies the communication signals to the required power level for transmission. It is the most power consuming stage in a transceiver chain; consequently, any improvement in terms of dissipated power and efficiency of the power amplifier affects the overall power budget of the transmitter. Also, efficient performance of the RF power amplifier over extend...

Harmonic-Multiplying Gryo-Amplifiers. The Phigtron has been studied both theoretically and experimentally to demonstrate the performance capability of harmonic gyro-amplifiers and investigate the nonlinear electronic processes which are the basis for these devices. The key issues are to what extent frequency multiplication and cyclotron harmonic operation may degrade or possibly improve amplifi...

This work reveals the design for broadband high-power high-efficiency GaN HEMT power amplifier, operating in frequency band ranging from 2.15 GHz to 2.65 GHz. The proposed structure is implemented using Cree CGH40010 transistor. and performances over bandwidth are achieved load-pull technique. amplifier unconditionally stable entire band. With neatly designed matching circuits, introduced shows...

In this chapter, we propose several schemes for fiber amplifiers which are all using fiber Bragg gratings (FBGs) as the key elements for their advantages of better uniformity, higher contrast ratio and lower cost. Several applications using FBG-based fiber amplifiers are also introduced. Therefore, this chapter initiates the overview of FBGs characteristics in Sec. 1, then addresses the FBGs pl...

Active network synthesis is important for circuit designer to find new circuits with desired performance. In this paper, a method of Tow-Thomas (TT) Bi-quad band-pass filter circuit generation methods is proposed using nullor representation of the operational amplifier (OPA), and a method for synthesizing active band-stop filters is presented, both of which start from voltage transfer function ...