We computationally investigate cascaded amplification in a three-level mid-infrared (IR) Pr(3+)-doped chalcogenide fiber amplifier. The overlap of the cross-sections in the transitions (3)H(6)→(3)H(5) and (3)H(5)→(3)H(4) enable both transitions to simultaneously amplify a single wavelength in the range between 4.25 μm and 4.55 μm. High gain and low noise are achieved simultaneously if the signa...

A wideband optical frequency comb (OFC) generator using a fiber re-circulating loop (FRL) including phase modulator and amplifier, cascaded with spectrum expander containing high-power erbium-doped amplifier highly nonlinear (HNLF) is proposed experimentally demonstrated, in which the FRL used as source to generate seed lines, then generated lines are extended four-wave mixing HNLF. Only one st...

This work reports a multipurpose highly linear ultrawideband amplifier with gain-bandwidth product (GBP) of 1.75 THz, the highest reported in any monolithic microwave integrated circuit (MMIC) process. A transimpedance is cascaded distributed amplifier, emulating receiver subsystem. Using diamond heat spreader, to dissipate from transistors, amplification subsystem can achieve very high output ...

In this review article, a stage-convertible RF power amplifier designed with a 0.18-m RF CMOS process is described. A method to implement a low-power matching network is an essential technology for the stage-convertible power amplifier. Various low-power matching networks with distributed active transformers as an output power combiner are compared in terms of the amounts of undesired coupling...

A simple and robust ultrafast, high-peak-power 5-μm laser source for pumping a dielectric photonic structure for high-gradient electron acceleration has been designed and is being constructed. The 5-μm laser source consists of two components: (1) a type-II-BBO-based 2.05-μm optical parametric amplifier (OPA) as a pump source, and (2) a type-I-ZGP-based 5-μm OPA to produce mJ-class, <100 fs puls...

A Wilkinson power divider with a differential output implemented in parallel-strip-line (PSL) is proposed. Taking full advantages of the PSL technology and a three-stage cascaded design, more than 170% impedance and isolation bandwidths are obtained. Inherent to the PSL structure, the 180 differential output is frequency-independent. A class-B push–pull power amplifier employing the devised con...

This paper reports an ultra-low-voltage (ULV) single-crystal oscillator-timer (XO-Timer) for sub-0.5 V Bluetooth low-energy (BLE) radios that aims self-powering by harvesting the ambient energies. Specifically, we tailor on-chip micropower manager (lPM) to customize voltage and current budgets each sub-function of XO-Timer. Such lPM shows a high power efficiency introducing 3-stage cascaded str...

Abstract- A novel low-voltage two-stage operational amplifier employing resistive biasing is presented. This amplifier implements neutralization and correction common mode stability in second stage while employs capacitive dc level shifter and coupling between two stages. The structure reduces the power consumption and increases output voltage swing. The compensation is performed by simple mill...

In this work, we analyze the effects of an inter-stage capacitor located between the power stage input and the driver stage output on the overall efficiency of a RF CMOS power amplifier and on gate-drain reliability problems. To verify the analyzed effects, we designed a RF CMOS power amplifier with a center frequency of 1.85GHz. Class-D amplifiers with a feedback resistor are used as driver st...