A new wideband high gain CMOS transimpedance amplifier is presented without using any inductor. In the proposed TIA, enhancing path introduced in active voltage-current feedback TIA topology to increase both and bandwidth. This increases transconductance of which reduces input resistance leads bandwidth extension. Additionally, for utilizing benefit this topology, cascading common source stage ...

This letter presents an automatic power amplifier (PA) design methodology that uses a multidimensional search algorithm to find the best compromise between fundamental and harmonic impedance terminations for specified bandwidth. In conventional methodologies, PA designers need preselect optimum impedances, which normally follow non-Foster trajectories, are thus impossible achieve with passive m...

this paper surveys recent research on Low Noise Amplifier (LNA) design for Cognitive Radios (CR). Design challenges and requirements of CR are discussed and recent advances in topologies and design techniques are presented, compared and summarized. The classical trade-offs of linearity, gain, input impedance matching and noise are discussed herein with respect to the Wide Bandwidth requirement....

Radio frequency power amplifiers play a key role in transceivers for mobile communications and their linearity is a crucial aspect. In order to meet the linearity requirements dictated by the standard at a reasonable efficiency, the usage of a linearization technique is desired. For effective implementation of any linearization technique, accurate modelling of power amplifier is required. Due t...

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 ...

A single-stage ultra-wideband (UWB) CMOS low noise amplifier (LNA) employing interstage matching inductor on conventional cascode inductive source degeneration structure is presented in this paper. The proposed LNA is implemented in 0.18μm CMOS technology for a 3 to 5 GHz ultra-wideband system. By careful optimization, an interstage inductor can increase the overall broadband gain while maintai...

A compact wideband 2 -6GHz highly linear low noise amplifier is designed for Digital RF application. This design is implemented using MMIC using GaAs pseudomorphic high electron mobility transistors (pHEMTs). The proposed design is fundamentally designed for SDR and cognitive radio application. This LNA is implemented in 0.5um GaAs process and has a gain of 30dB at 2.45GHz and 23dB at 5GHz,Nois...

A wideband variable gain amplifier (VGA) design is introduced with two different schemes. It is based on a fully differential amplifier with resistive loads, and a Negative Miller Capacitance technique is used to increase the bandwidth of the amplifier. The amplifier consists of three stages, and the gain is varied through the second and third stages, where they are degenerated by a voltage con...