We report the demonstration of a high-power single-side-pumped Yb:YAG planar waveguide amplifier seeded by an Yb:KYW femtosecond laser. Five passes through the amplifier yielded 700-fs pulses with average powers of 50 W at 1030 nm. A numerical simulation of the amplifier implied values for the laser transition saturation intensity, the small-signal intensity gain coefficient and the gain bandwi...

We present a broadband optical parametric amplifier design using tapered gain and tandem chirped quasi-phase-matching gratings to obtain flat gain and group-delay spectra suitable for applications such as ultrashort-pulse amplification and fiber-optic communication systems. Although a tapered-gain amplifier consisting of a single chirped grating can provide constant gain over a wide frequency r...

Co-design of digital signal-processing (DSP) algorithms and power-amplifier characteristics can lead to improved efficiency and linearity through a variety of strategies including: predistortion, DSP control over bias conditions, particularly the power supply voltage, and DSP generation of digital input signals for switching amplifiers. This paper discusses several amplifier architectures that ...

The CA3080 and CA3080A are similar in generic form to conventional operational amplifiers, but differ sufficiently to justify an explanation of their unique characteristics. This new class of operational amplifier not only includes the usual differential input terminals, but also contains an additional control terminal which enhances the device's flexibility for use in a broad spectrum of appli...

In this paper, we provide a simple closed-form expression of the effective signal-tonoise ratio (SNR) for orthogonal frequency division multiplexing (OFDM) performance under the combined effect of synchronization errors (i.e. phase noise, carrier frequency offset, Doppler spread, sampling frequency offset, and timing jitter), transmitter I/Q imbalance, receiver I/Q imbalance, and amplifier nonl...

An effective current scaling method with source degenerated resistors proposed in the design of Bulk-Driven Folded-Cascode (BDFC) amplifier. The transconductance of the amplifier significantly vary with the common mode voltage. A 0.5V efficient Band Pass Filter (BPF) using bulk driven Operational Trans conductance amplifier (OTA) is designed for detection of QRS complex in ECG signal 17Hz. A lo...

A broadband radial waveguide power amplifier has been designed and fabricated using a spatial power dividing/combining technique. A simple electromagnetic model of this power-dividing/combining structure has been developed. Analysis based on equivalent circuits gives the design formula for perfect power-dividing/ combining circuits. The measured small-signal gain of the eight-device power ampli...

A current amplifier is used to realize a voltage amplifier having an improved high frequency response and slew rate capability. It is shown that the closed loop bandwidth is independent of the closed loop voltage gain. The design and application of a unity gain and a high gain current amplifier to voltage signal processing circuits are given. The results demonstrate an efficient use of the inhe...

The application of a random sampling scheme in high-frequency digital lock-in amplifiers is proposed. This scheme allows reducing the sampling frequency with reduced aliasing effects. Analytical and numerical analyses that show the advantages and limitations of the proposed scheme are presented. Furthermore, experimental tests that validate the proposal are given. The maximum input-signal frequ...

A CMOS amplifier / analog-to-digital (A/D) converter for the measurement of ultralow currents like photocurrents down to the subpicoampere range and with a bandwidth of some kHz is presented. Double sampling of the integrated current by a window comparator eliminates clockfeedthrough, kT/C-noise as well as nonlinearities of the amplifier, which is operated in a switched-current like mode. The c...