Monolithic preamplifier employing epitaxial n-channel JFETS

Analysis of fiber based coherent detection employing optical preamplifier and time-domain filter

We report on a novel fiber based coherent detection system employing an optical preamplifier, a spectrum bandpass filter, and a time-domain filter. The time-domain filter, a synchronous time gate, reduces the in-band Amplified Spontaneous Emission (ASE ) beat noise, which cannot be achieved by the spectrum bandpass filter alone. In preliminary experiments with a 100 GHz bandpass filter, no degr...

Separating SIS Mixer-Preamplifier

The ALMA Band 6 (211-275 GHz) receivers use sideband-separating SIS mixer-preamplifiers with dual 4-12 GHz IF outputs. The sideband-separating mixers are of the phasing type, with the LO driving two component mixers in-phase and the RF signal connected to the mixers through a quadrature hybrid. The IF outputs of the mixers are amplified, then combined in a quadrature hybrid which separates the ...

A Monolithic Multi-Channel Data Acquisition Integrated Circuit

A Monolithic, Dual Channel, DC to 20GHz SPDT

This paper describes the design and evaluation of a Single Pole Double Throw (SPDT) switch IC covering DC to 20GHz. Two SPDTs are realised on each die to give a dual channel part for use in systems where accurate gain and phase matching between channels is vital. The switch was fabricated on Triquint Semiconductor Texas’ 0.25μm PHEMT process and has a measured insertion loss of less than 1dB to...

Monolithic integration of room-temperature multifunctional BaTiO3-CoFe2O4 epitaxial heterostructures on Si(001)

The multifunctional (ferromagnetic and ferroelectric) response at room temperature that is elusive in single phase multiferroic materials can be achieved in a proper combination of ferroelectric perovskites and ferrimagnetic spinel oxides in horizontal heterostructures. In this work, lead-free CoFe2O4/BaTiO3 bilayers are integrated with Si(001) using LaNiO3/CeO2/YSZ as a tri-layer buffer. They ...