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A switching mode RF power amplifier that employs a narrowband filter directly connected to the output, is presented. The efficiency improvement compared to a conventional class B PA and the influence of a transmission line between the PA and this filter is investigated. These techniques are illustrated by circuit simulation and verified by measurements. It is shown how the transmission line between...
<para> A design methodology for watt-level, fully integrated CMOS power amplifiers (PAs) is presented. It is based on the analysis of the operation and power loss mechanism of class-E PAs, which includes the effects of a finite dc-feed inductance and an impedance matching transformer. Using the proposed approach, a class-E PA with a 2 1:2 step-up on-chip transformer was implemented in...
Efficient power amplifiers are essentially needed in portable battery-operated systems such as mobile phones because the power amplifier is the most power consuming building blocks in the transmitter of these portable systems. This paper presents efficient techniques to increase the efficiency of the power amplifier as much as possible by degrading the power dissipation of the transistor in the mobile...
The cellular mobile communication industry has recently been one of the fastest growing industries. This paper presents efficient techniques in the design of switching mode class E power amplifiers by reducing switching losses. A typical class E circuit has been design-optimized for 900 and 1800 MHz. Matching networks are used to reduce power consumption. The simulated results were analyzed in terms...
A wideband modulator for a 20 MHz bandwidth polar modulated PA is presented which achieves a maximum efficiency of 87.5% and a small signal -3 dB bandwidth of 285 MHz. Realized in 65 nm CMOS, it consists of a cascoded nested Miller compensated linear amplifier and a class D switching amplifier. It can deliver 22.7 dBm output power to a 5.3 Omega load. With a switching frequency of 118 MHz, the output...
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