Novel formulas to analyze the gain characteristics of Er3+/Yb3+ co-doped waveguide amplifiers(EYCDWA)are derived from the rate equations and the light propagation equations under the uniform dopant and steady-state conditions,neglecting the amplified spontaneous emission and introducing initial energy transfer efficiency.

The Er~(3+) doped waveguide amplifier is another promising one after the successful development of the Er~(3+) doped fiber amplifier and the semiconductor optical amplifier.

Simulated results show that the output power gain of this device is much larger than those of the Er~(3+) /Yb~(3+) co-doped straight waveguide amplifier with the same waveguide length.

Described a highly sensitive CMOS chopper amplifier for a monolithic magnetic hall sensor.

It can be widely used in tune and impedence matching for microwave amplifiers and oscillators, and can also be used in passive networks.

Microwave amplifiers are very important in satellite communication, wireless communication and some other fields.

The Rn-Gn noise model and the noise parameters extraction of microwave amplifiers are studied.

This paper introduces an analysis case of the abnormal self - oscillation on an imported microwave amplifier under static bias.

The microwave transistor power amplifier function under the circumsitances of large signal ,so its method of designing and the tansistor used is different from these of microwave amplifier wo.