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This paper presents a low-power Class-D stage featuring a new harmonic reduction technique, which cancels the 3rd harmonic and reduces the 5th harmonic. The technique creates a voltage level of VDD/2 from a single supply voltage to shape the drain voltage, uses only digital circuits and eliminates the short-circuit current present in inverter-based Class-D stages. From a single Class-D stage operating...
Abstract-Shortwave power amplifiers (PAs) are nonlinearization and their features are changed with many kinds of factors such as the temperature of environmental, electrical aging, at the same time they have strong memory effection. In this paper, an indirect learning architecture and digital pre-distortion have been adopted, MDS algorithm applied in adaptive pre-distortion amplifier system of optimizes...
In this paper the operation behavior of three-way Doherty amplifier loaded with harmonic control circuit is analyzed, including the efficiency and linearity. Amplifier is designed in configuration with two quarter-wave impedance transformers in the output combining circuit with LDMOSFETs in carrier and peaking amplifies in periphery relations 1:2.5:2.5. The signals for linearization: the fundamental...
A 2.45 GHz 0.18 ??m RF CMOS Class-AB power amplifier (PA) with high linearity and output power for WLAN is presented in this paper. The proposed power amplifier is implemented with a two-stage architecture which is followed by an off-chip output matching network. To improve the linearity, an integrated diode linearization circuit provides a compensation mechanism for the input capacitance variation...
In this paper, the macro nonlinear IMP distortion is analyzed in terms of the power spectrum (by this we mean here the envelopes of the power spectral densities) of the IMP order and the nonlinearity-independent IMP distribution density functions (DDF) of IMP composition types. This analysis of the 'micro' contributors to the overall IMP distortion highlights which composition types dominate the distortion...
In some low power wireless systems, such as ZigBee, a single amplifier can be designed to perform the functions of both the front endpsilas low noise amplifier and power amplifier. Such an amplifier, usually a very low power one, would lack highly effective, usually high power consuming, linearization techniques but also suffer from linearity issues associated with high power operation. One of these...
We propose a simple and effective linearization technique based on low frequency signal injections. The improvement of the third-order intermodulation product (IMD3) performance is obtained by feeding the baseband signals, generated by the baseband generation circuit, to the amplifier through the input and output biasing circuitries. With the addition of the low-frequency signals at both input and...
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