We adopt a three-level scheme for the pump – amplification process in 1.48 m pumped Erbium-Doped Fiber Amplifiers, which reproduces the main experimental features of amplifiers with short and long fiber lengths. Continuous wave amplification in a simplified slab waveguide structure is simulated by means of the scalar Beam Propagation Method, taking into account signal and pump propagation throu...

We generalize the standard quantum model (Caves 1982 Phys. Rev. D 26 1817) of the noise properties of ideal linear amplifiers to include the possibility of non-ideal behavior. We find that under many conditions the non-ideal behavior can be described simply by assuming that the internal noise source that describes the quantum noise of the amplifier is not in its ground state. We validate this m...

This paper presents a predictable fixed gain instrumentation amplifier using switched capacitor instead of resistor to improve the accuracy of the gain as 10. This instrumentation amplifier builds up by two operational amplifiers which connect by switched capacitor. These switched capacitors are used to stable the whole circuit, fix the gain of total instrumentation amplifier. Using two operati...

Differential amplifiers can be an appropriate solution in the implementation of radio astronomy receivers, due to their efficient interference and harmonic isolation. In this paper, two different topologies are presented. The first one consists of two single ended amplifiers in a balanced topology. The second one is formed by cascading two simple differential stages. Both circuits operate in th...

Optimizing wireless network operations can be achieved by transmission power control of wireless nodes, which is mostly performed by regulating the final power amplifier. Depending on the desired transmission power level, currently popular amplifiers work at different levels of efficiency: highest in case of maximum output power, lower in case of reduced output power. As the power amplifier is ...

An overview of digital predistortion techniques for microwave power amplifier linearization is here presented. Different predistortion approaches are considered, and both static and dynamic (memory effects) behavioral models are presented. Special focus is done to the most suitable solutions for facing the new challenge to linearize high-bandwidth amplifiers, as demands most of the new telecomm...

This story has been happening as the demand for high-speed data increases and battery capacity has not matched advances with communications technology. It’s not the battery at fault but the technology needed to power the amplifier on the phone. For years, normal DC-DC converters managed the battery power flowing in the phone to different chips. This included the power amplifier (PA) for driving...

Absfracr-The class E tuned power amplifier consists of a load network and a single transistor that is operated as a switch at tbe carrier frequency of tbe output signal. ‘zbe most simple type of load network consists of a capacitor shunting tbe transistor and a series-tuned output circuit, which may bave a residual reactance. Circuit operation is determined by tbe transistor when it is on, and ...

This paper deals with well-defined design criteria for two-stage CMOS transconductance operational amplifiers. A novel and simple design procedure is presented, which allows electrical parameters to be univocally related to the value of each circuit element and biasing value. Unlike previous methods, the proposed one is suited for a pencil-and-paper design and yields accurate performance optimi...