Current RF power amplifier (PA) linearization techniques are presently being investigated to improve PA linearity and power efficiency. One such linearization technique, Cartesian feedback (CFB), makes use of analog feedback to linearize a nonlinear plant (Figure 1). The commanded baseband symbol, I and Q, are compared to the symbol being transmitted by the PA, the baseband symbol is predistort...

This paper presents a design methodology for load modulated balanced amplifier (LMBA) focusing on AMPM distortion mitigation. By introducing second harmonic control as degree of freedom, complex trajectory can be selected to compensate nonlinearities in the device without substantially affecting efficiency. A mathematical derivation is accompanied by procedure based closed-form equations fabric...

Date The final copy of this thesis has been examined by the signatories; and we find that both the content and the form meet acceptable presentation standards of scholarly work in the above mentioned discipline iii Thesis directed by Professor Zoya Popovi´c In wireless communications systems, the transmit front-end consumes a large fraction of the total available power. In particular, the power...

In the design of a low noise amplifier,LNA, or mixer driver stage there exists an optimal source source impedance to provide the maximum power transfer into the transistor and thus the maximum gain. There also exists an optimal source impedance, Znopt, to provide the minimum noise figure for the circuit. At the maximum power source impedance, Zpopt, the input is matched to the source impedance ...

SUMMARY An impedance-isolation technique is proposed for on-chip ESD protection design for radio-frequency (RF) integrated circuits (ICs), which has been successfully verified in a 0.25-μm CMOS process with thick top-layer metal. With the resonance of LC-tank at the operating frequency of the RF circuit, the impedance (especially, the parasitic ca-pacitance) of the ESD protection devices can be...

OBJECTIVES A system is being developed for measurement of biologic active points (BAPs) in humans using a modified dry electrode. The BAPs measuring system analyzed the electrical characteristics and searched for the position of BAPs using modified dry electrodes. SUBJECTS Skin electrical resistance at BAPs and non-BAPs was examined with a modified electrode system for healthy male subjects (...

In this paper, a new method for designing an active dual-band dipole antenna is proposed. The operating frequencies of the proposed antenna are 150 and 450 MHz that are usually used in military applications. Using a series stub is the main idea in the proposed dual-band antenna, where it makes an independent resonance frequency higher than the main resonance frequency of a conventional dipole. ...