a new output structure for class e power amplifier (pa) is proposed in this paper. a series lc resonator circuit, tuned near the second harmonic of the operating frequency is added to the output circuit. this resonator causes low impedance at the second harmonic. the output circuit is designed to shape the switch voltage of the class e amplifier and lower the voltage stress of the transistor. t...

This paper develops an analytical model for a standard topology, fully differential, switched capacitor amplifier; including the base amplifier offset voltage and common mode range, and capacitor mismatch effects. The amplifier is designed in a 0.6 μm process and the analytical model accuracy is compared with the simulation results.

A master oscillator power amplifier (MOPA) with variable amplifier gain lengths was built to demonstrate power enhancement of an alkali vapor laser. A small signal gain of 0.91 / cm for two different gain lengths was observed. For a 2 cm long amplifier gain length an amplification of 7.9 dB was observed.

In this paper, a new image-reject low noise amplifier is designed for the 2.4 GHz industrial-scientific-medical (ISM) band. An inter-stage T-structure filter is used in the low noise amplifier design to provide 35-dB image rejection. The goal of this design is to merge the image-reject function into the low noise amplifier.

This application note presents isolation amplifier circuit designs useful in industrial, instrumentation, medical, and communication systems. It covers the IL300’s coupling specifications, and circuit topologies for photovoltaic and photoconductive amplifier design. Specific designs include unipolar and bipolar responding amplifiers. Both single ended and differential amplifier configurations a...

A scheme for realizing a photon number amplifier by use of a high-quantum-efficiency photodetector and a number-state semiconductor laser is analyzed. It is found that the photon number amplifier is not significantly limited by the electronic amplifier noise or by the laser quantum efficiency for input states that are nearly classical.

Amplifier nonlinearities affect drastically the performance of Orthogonal Frequency Domain Multiplexing OFDM systems. In this paper, the effects of amplifier nonlinearities is evaluated in OFDM with Space-Division-Multiple-Access (SDMA). We showed that nonlinear power amplifier reduced dramatically the performance of multiple-antennas OFDM systems.

Three different configurations have been reported for programming explicitly inverting, positive fractional and non-inverting gains, respectively. This paper proposes a single operational amplifier digitally programmable circuit for a set of arbitrary gains, which may include inverting, positive fractional and/or non-inverting gains, with minimum number of elements. The design procedure is illu...

In this paper, we investigate the parameters affecting Total Harmonic Distortion (THD) and Power Supply Rejection Ratio (PSRR) in PWM Class D Amplifiers (CDAs) on the basis of linear models with feedback. From our mathematical analysis, we show that the THD of a PWM Class D amplifier with feedback can be improved by increasing the gain of the integrator through adding another amplifier at the o...

This paper proposes a low voltage (±0.55V supply voltage) low power (44.65µW) high common mode rejection ratio (CMRR) differential amplifier (d.a.) with rail to rail input common mode range (ICMR), constant transconductance (gm) and enhanced frequency performance. Its high performance is obtained using a simple negative averaging method so that it cancels out the common mode input signals at th...