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...

Optical communication systems, operating in C-band, are reaching their theoretically achievable capacity limits. An attractive and economically viable solution to satisfy the future data rate demands is employ transmission across full low-loss spectrum encompassing O, E, S, C L band of single mode fibers (SMF). Utilizing all five bands offers a bandwidth up $\sim$53.5THz (365nm) with loss below...

A numerical design method is presented for the design of all pole band pass active-RC filters applying just one operational amplifier. The operational amplifier model used is the integrator model: t/s where t is the unity gain frequency. The design method is used for the design of a fourth order band pass filter with Butterworth poles applying just one operational amplifier coupled as a unity g...

A wide-bandwidth automatic gain control (AGC) amplifier IC was developed using a self-aligned selective-epitaxial SiGe heterojunction bipolar transistor (HBT). A transimpedance load circuit was used, and its damping factor was optimized to achieve a wide bandwidth of 32.7 GHz. Capacitor peaking was introduced to the second variable-gain amplifier in order to obtain a wide gain dynamic range of ...

A new BiCMOS variable gain transimpedance amplifier with a large area integrated photodiode for automotive applications is presented. Through careful control of the input pole position and the frequency response of the core amplifier, the bandwidth of the transimpedance amplifier varies from 112 to 300 MHz when its gain changes from 14.2 kV to 400 V. The proposed circuit configuration maintains...

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...

This paper presents the design, fabrication and performance of a three-stage 155GHz monolithic low noise amplifier (LNA) using 0.1 -pm pseudomorphic (PM) InAIAs/InGaAs/InP HEMT technology. This amplifier exhibits a measured small signal gain of 12 dB at 155 GHz, and more than 10 dB gain from 151 to 156 GHz. When this amplifier is biased for low noise figure, a noise figure of 5.1 dB with associ...

This paper presents a fixed gain high output power amplifier with performance determined by using on-wafer measurement. The amplifier is fully differential based on inductive load and resistive degeneration which is designed using a 0.18 μm SiGe BiCMOS process. The amplifier achieves power gain of 7.2 dB, 3-dB bandwidth of 2.06 GHz, operating frequency of 12 GHz, power consumption of 12 mW usin...