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In a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, one of the critical components is the RF power amplifier. However, RF power amplifiers are perfectly linear. This is one of the main concerns in an RF power amplifier design. The nonlinearity control is described by the out-of-band power emission levels, and the nonlinearity of an RF power amplifier is described by the...
In addition to LNA (low noise amplifier) noise figure, gain and input matching, its linearity is also an important consideration. An LNA must amplify signal without adding too much noise but also remain linear even when strong signals are received. In the narrowband LNA topology, good values of S-parameters and noise performance are achieved at the expense of linearity. In order to improve LNA linearity,...
An adaptive gate-source biasing scheme to improve the MOSFET RF circuit reliability is presented. The adaptive method automatically adjusts the gate-source voltage to compensate the reduction in the drain current subjected to various device reliability mechanisms. The MOS DC circuit using the adaptive technique is less sensitive to a threshold voltage and mobility degradations from a long-term stress...
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