a novel low noise trans-impedance amplifier is proposed using low cost 0.18 µm cmos technology. a resistive-capacitive feedback is used to extend the bandwidth of the amplifier. as the structure is inductor less, it is suitable for low cost integrated optical interconnects. in this paper improved particle swarm optimization have applied to determine optimal trans-resistance and noise of propose...

This paper presents the technique to dynamically enhance the power efficiency of PWM class-D amplifier over a wide range of modulation indexes. The power stage of amplifier is segmented into several small stages and selectively enabled according to the power demand (i.e. modulation indexes). The capability of power delivery is dynamically adjusted to minimize the power loss in case of different...

A single-stage X-band MMIC power amplifier incorporating a SiGe/Si power HBT and lumped passive components is reported. The power HBT is characterized by an fmax of 67 GHz and a BVCBO of more than 24 V. The matching circuits were designed for maximum output power using on-chip spiral inductors and SiO MIM capacitors. Continuous wave measurements were made at 8.4 GHz, under class A operation. Th...

We have progressed in the analysis and design of Class E amplifiers over the past year. An accurate analysis of the nonlinear output capacitance and of the finite feed inductance has led to new design techniques which have been verified through a prototype MOSFET Class E PA. Also, we have demonstrated that the duty cycle of the switch can be varied to increase the maximum operating frequency of...

We have developed a 100 W class Nd:YAG master oscillator power amplifier system based in part on an end-pumped zigzag slab power amplifier. This amplifier incorporates parasitic oscillation suppression by using roughened edges and achieves a small-signal gain coefficient (g(0)l) of 8.06. We describe a novel technique for suppression of parasitic oscillations using claddings on slab edges that s...

In this work, dynamic load modulation of high power amplifiers using a varactor-based tunable matching network is presented. The feasibility of dynamic tuning and efficiency enhancement of this technique is demonstrated using a modular design approach for two existing high efficiency power amplifiers (PA), a 7-W class-E, and a 10-W class-J power amplifier PA at 1 GHz. For this purpose and for e...