Fig.2 Amplifier under test. Amplifiers can operate in classes A, B, AB, C, D, E and F [2]. We tested class A amplifier made by „Microwave Power Devices“, Model: LWA 4690-1/1837, based on bipolar devices (Fig.2). Usually, 1dB compression point, gain and two-tone third-order intercept point are measured as the amplifier figure of merit. As specified by manufacturer, the frequency range of the amp...

In this paper we present an ultra low-voltage (ULV) floating-gate (FG) transconductance amplifier The amplifier is can operate at supply voltages down to 0.3V in a standard digital double poly CMOS process . The amplifier consists of three subcircuits, the single input analog FG inverter, the additive (double input) analog FG inverter with tunable gain and a FG digital inverter. Preliminary mea...

The efficiency optimization of a feedforward low distortion power amplifier is presented. Based on the principle of distortion compensation, the main amplifier output power, that of subamplifier, and amplifier efficiency have been accurately derived. In the present analysis, the coupling coefficient of main signal and distortion paths is selected as the optimization parameter because it may ess...

An electronic amplifier, amplifier, or (informally) amp is an electronic device that increases the power of a signal. It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. Amplifier design relies on feedback mechanism. Offsets that accumulate in different stages of amplifier are corrected by feedback mechanism. ...

In this paper, power amplifier operating with center frequency of 947.5 MHz, which can be used for the transmitter in beamforming systems, is proposed. The power amplifier implemented provides high power added efficiency (PAE) of 71.967% and low noise figure (NF) as low as 1.525. The linearity of the power amplifier is improved by using square law and cubic law analog predistortion techniques. ...

The design of a fully differential CMOS transconductance amplifier is presented in this paper. This amplifier is to be used in the first stage of a 13-bit pipelined A/D converter, and was designed to meet the necessary specifications at a minimum level of power consumption. The amplifier presented below was based on a two-stage design of a telescopic cascode input stage followed by a common-sou...

This paper provides electronic implementation of electrocardiograph (ECG) circuit by using instrumentation amplifier (IA) as bio-potential amplifier in such a manner which reduces noise, common voltage, DC offset value and RF interference from the existing circuit.Noise and common voltage can be removed from ECG using driven right leg circuit or by using isolator circuit. DC offset can be remov...

Presented is a 0.9 V rail-to-rail constant gm CMOS amplifier input stage consisting of complementary differential pairs and a gm control circuit. The gm control circuit eliminates the gm dead zone, which occurs in the conventional rail-to-rail amplifier with ultra-low supply voltages. The proposed amplifier input stage has a constant gm that varies by +2.3% for rail-to-rail input common-mode le...

— A low power wideband noise amplifier (LNA) for 1GHz to 10GHz wireless has presented for wireless application in this dissertation work. Low power wideband noise amplifier is design by using resistive shunt feedback, current reuse, gain flatting techniques, and inductive feedback technique. The high mobility electron transistors are used to improve the Noise Figure (NF) and scattering paramete...

Class-E amplifier has the potential to deliver high efficiency required for the next generation wireless systems. In this journal, we discuss a novel load pull analysis technique to characterize the efficiency performance of Class-E amplifier in an outphasing power combining scheme. Class-E amplifier is not an ideal current or voltage source as is required for the traditional analysis of outpha...