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4. SSPA linearity
4.1 Linearity requirements in telecommunications
In telecommunications, a digital signal carries a succession of symbols, each characterized by a precise position in a two-dimensional phase space, defined by amplitude and phase (known as PSK, APSK or QAM modulation). Any deviation from this theoretical position (noted EVM for Error Vector Magnitude) induces a degradation of the signal-to-noise ratio (C/I) and ultimately of the link error rate (BER). To limit the amplitude of these deviations, the gain of an amplifier and the phase shift between input and output must be independent of the level of the input signal and its exact frequency (within the operating band): these are the linearity constraints.
Phase is by nature modulated, and the amplitude (also known...
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SSPA linearity
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A complete list would be difficult to draw up in the case of the solid state, given the diversity of the players involved. It would have to include epitaxial wafer manufacturers, foundries (open or not, or even captive foundries, some of which are large industrial laboratories with a predominantly research activity), design houses, microelectronics assembly companies, transmitter manufacturers and even some...
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