Erbium-doped fiber amplifiers ~EDFAs! have been intensively studied for wavelength-division-multiplexing ~WDM! communication systems. The stabilization of the amplifier gain against the input signal-power variation is one of the key issues for WDM networks. The gainstabilizing technique using a passive optical feedback device, such as a bandpass filter or a fiber Bragg grating, has been reporte...

Editor’s notes: This article presents a method for designing bandpass (BP) negative group delay (NGD) active circuits. The circuit topology consists of distributed BP NGD passive cascaded with microwave amplifier. design is validated through simulations and measurements prototype implementation...

We describe a custom-designed bio-amplifier and its use in teaching neurophysiology to undergraduate students. The amplifier has the following features: 1) differential amplification with driven shield inputs, which makes it workable even in electrically unshielded environments, 2) high input impedance to allow recordings of small signals through high signal source impedance, 3) dual fixed freq...

We discuss how all-optical signal processing might play a role in future all-optical packet switched networks. We introduce a concept of optical packet switches that employ entirely all-optical signal processing technology. The optical packet switch is made out of three functional blocks: the optical header processing block, the optical memory block and the wavelength conversion block. The oper...

Single-ended and differential operational transconductance amplifier (OTA) configurations are biased with MOSFET interface-trap charge-pumping (ITCP) current generators to achieve very low transconductances for tunable sub-hertz operational transconductance amplifier-capacitor (OTA-C) filter implementation. This paper reviews the basics of ITCP current generation and presents the transconductor...

The signal arrives from the antenna, and is amplified by one or more stages of RF amplification (and sometimes bandpass filterig), and is then presented to the 1 mixer where the signal is converted to a fixed intermediate frequency by the mixing action between the incoming signal frequency and the frequency produced by the Variable Frequency Oscillator. The result is a fixed intermediate freque...

ABSTRACT: In this paper, the design of lowpower secondorder switched – capacitor bandpass filter is presented in 0.18μm CMOS technology. Instead of two operational amplifiers in conventional structures only one operational amplifier is used to significantly reduce power consumption and chip area. Quality factor and maximum gain can be simply tuned by employing lowthreshold NMOS transistors as t...

The presented paper includes the design and implementation of a 65 nm CMOS low-noise amplifier (LNA) based on inductive source degeneration. The amplifier is realized with an active balun enabling a single-ended input which is an important requirement for low-cost system on chip implementations. The LNA has a tunable bandpass characteristic from 4.7 GHz up to 5.6 GHz and a continuously tunable ...

We present a stabilized master-laser power-amplifier system for ground-based differential absorption LIDAR (DIAL) for profiling atmospheric water vapor. This system consists of two CW master lasers with the wavelength of each master laser actively stabilized. The system employs GaAlAs laser diodes for both the master lasers and the tapered laser amplifier. The on-line master laser is currently ...