US3436686 1965年6月28日 1969年4月1日 Tesla Narodni Podnik Amplitude modulation circuit with high power efficiency for two amplifiersUS3436686 1965年6月28日 1969年4月1日 Tesla Np Amplitude modulation circuit with high power efficiency for two amplifiers...
A Doherty system combines the outputs of two or more linear RF power amplifiers (PAs) through an impedance-inverting coupler such as a quarter-wave transmission line. At low output levels, the first PA operates linearly, reaching saturation (and maximum efficiency) at some transition voltage below...
M-QAM (Quadrature Amplitude Modulation) modulations have been adopted on HSDPA (High Speed Downlink Packet Access) and satellite links, due his higher spectral efficiency. However, due to large envelope fluctuations levels, nonlinear operations such as an high power amplification are undesirable since ...
A static converter is an electrical circuit which can control the transfer of energy between a generator and a receiver. The efficiency of a converter should be excellent. The components constituting a converter are: Capacitors, inductors and transformers with minimum losses, Power semiconductors operat...
An efficiency enhanced power amplifier is presented. The amplifier uses envelope tracking (ET) technique and static predistortion to achieve high linearity... H Harju,T Rautio,S Hietakangas,... - IEEE 被引量: 45发表: 2007年 Performance Analysis of LMS Filter in Linearization of Different Memoryl...
designed a high-efficiency transceiver system of 0.13 µm CMOS process in 1.0 mm2 silicon area with a simple on–off key transmitter having a data rate of 20 Mbps using a 500 MHz RF channel [46]. Integrated chips handle the image compression algorithms to increase the frame rate using ...
A dynamic biasing procedure designed to improve the average dc-rf conversion efficiency of power amplifiers employing multi-level modulation schemes such as QAM is investigated. In this technique, the gate bias voltage is adjusted in accordance with the phasor currently being transmitted. Simulations sh...
The power-added efficiency (PAE) of solid-state devices and tubes is a measure of the efficiency by which a device converts DC or RF input power to higher RF output. From: Advanced Array Systems, Applications and RF Technologies, 2000 ...
An accurate nonlinear model is necessary to optimize the tradeoff between efficiency and linearity in power amplifiers. Gain compression (AM/AM) and amplitude-phase (AM/PM) distortion are the two primary model inputs used to characterize the nonlinearity. The amplifier's AM/AM and AM/PM characte...
6.The multistage amplifier of claim 1 wherein power added efficiency peak of the first and second amplifiers is 0 to 2 dB above a linear operating region. 7.The multistage amplifier of claim 1 further comprising a third amplifier stage connected with the second amplifier stage having;a third ...