Tunable continuous-time ΔΣ modulator for switching power amplifier

Highly Efficient Envelope-Tracking Modulator Over Wide Output Power Range for Dual-Mode Power Amplifier

This paper presents a highly efficient envelope-tracking (ET) modulator over wide output power range. The ET modulator is designed to operate with a dual-mode power amplifier (PA). The supply voltage of the linear regulator is adjusted according to the average power level for further enhanced efficiency at a low power region. An adaptive bias circuit is designed to avoid the crossover distortio...

New Identification Procedure for Continuous-Time Radio Frequency Power amplifier Model

In this paper, we present a new method for characterization of radio frequency Power Amplifier (PA) in the presence of nonlinear distortion which affect the modulated signal in the Radiocommunication transmission system. The proposed procedure uses a grey box model where PA dynamics are modelled with a MIMO continuous filter and the nonlinear characteristics are described as general polynomial ...

Power Efficient Continuous-Time Delta-Sigma Modulator Architectures for Wideband Analog to Digital Conversion

A Wideband Low - Power Continuous - Time Delta - Sigma Modulator for Next Generation Wireless Applications by

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Optimal (Bandpass) Continuous-Time ZA Modulator

A systematic technique for designing a continuous-time sigma-delta modulator @AhI) is presented. The continuous-time m open-loop transfer function is obtained by the pulse-invariant transformation of its discrete-time equivalent. This method results in an inherently stable XAM and does not need any loss factor to make the modulator stable, and so provides the maximum achievable signal-to-noise ...