In this paper, a design and fabrication of a miniaturized 2.5 GHz 8 W power amplifier using selectively anodized aluminum oxide(SAAO) substrate are presented. The process of SAAO substrate is recently proposed and patented by Wavenics Inc. which uses aluminum as wafer. The selected active device is a commercially available GaN HEMT chip of TriQuint company, which is recently released. The optim...

The class D amplifier is not well known in audio applications. Its excellent power ratio (greater than 90%) is the most important advantage. The MOS transistors switching power stage is able to drive a useful power up to 100W to the loud speaker. However, designing such an amplifier is more difficult than designing a classical class A or AB power amplifier. The distortion level is also slightly...

1) Institut GOŠA d.o.o., Milana Rakića 35, 11000 Belgrade, SERBIA 2) Faculty of Electrical Engineering, Bul. kralja Aleksandra 73, 11120 Belgrade, SERBIA Introduction ANY industrial electronic control systems are designed to operate using only a single-power-supply voltage. The conventional integrated-circuit operational amplifier (IC op amp) is typically designed for split power supplies (±15 ...

For wideband or high power applications, the power amplifier exhibits memory effects, for which memory less predistorters can achieve only limited linearization performance. The memory polynomial predistorter can correct both the nonlinear distortions and the linear frequency response that may exist in the power amplifier. It is a robust predistorter, which has demonstrated good performance on ...

The method for power amplifier digital adaptive baseband pre-distortion with memory is proposed and applied to compensate the nonlinearity of power amplifier (with or without memory) driven with OFDM signal.

Introduction: Coupling between coil elements of a transmit array is one of the key challenges faced by designers of MRI transmitter arrays. To address this challenge, methods and systems have been developed to change the output impedance of the RF power amplifiers driving the array coils in order to suppress inter-element coupling effects. Chu [1], for example, proposed an output-matching netwo...

In this paper, reduced power consumption, low-noise CMOS amplifier using chopper technique is designed, chopper-equalized amplifier had been used as a front end of a voltage-to-frequency converter instrument which performs pretty well, and they were meeting just about every specification, but they had a problem with undesired and unpleasant little offset shifts and jumps. Trying to solve this p...

Mann, David William: 90nm CMOS Driver Amplifier for WCDMA Mobile Applications (Under the direction of Dr. Kevin Gard.) Integration is driving today’s cellular phone industry to create single chip cellphone systems. With the integration of Radio Frequency Transmitters into CMOS technology, robust circuits are needed that can scale with new technologies. This thesis explores the challenges of des...

We describe a low-power voltage amplifier that is suitable for RF (radio frequency) receivers in a WSN (wireless sensor network). Since a sensor node has a strict energy budget in a WSN, it often enters itself into a standby mode when no communication is required, and hence a standby power have to be suppressed as well as an active power in order to maximize a lifetime of a WSN. For this sake, ...

We have designed and developed a grating based thulium (Tm) doped fiber laser with ~150 nm tuning range which is used as the master oscillator in a master oscillator power amplifier (MOPA) thulium fiber laser system. Due to thermal instability in the grating used for tuning, the MO could produce a power up to 4.5 W, beyond which the oscillator became unstable. Injecting the seed laser into a bi...