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Power Amplifiers for Communications

Berkeley Power Amplifiers for Communications Prof. Ali M. Niknejad Berkeley Copyright c 2014 by Ali M. Niknejad Niknejad Advanced IC's for Comm PA System Level Specifications Niknejad Advanced IC's for Comm Power Amplifier Specifications Peak Output Power Efficiency Pdc Power Gain Zout != 50 . Amplifier Linearity Pin PL. Stability over VSWR. Ability to transmit into an unknown/varying load Heat Power Control Zin = 50 . Step size, range high efficiency at back-off Niknejad Advanced IC's for Comm Peak Output Power The peak output Power determines the range for two-way Communications . When we hit sensitivity limits, the only way to increase the range is to increase the Tx Power .

Power Added E ciency (PAE) is a popular metric. P out is the output power, P in is the input power, and P dc is the DC power consumption of the PA For high power gain systems (G p), the e ciency approaches the drain drain e ciency ( d), or for a BJT, the \collector" e ciency, or simply the e …

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rfic.eecs.berkeley.edu

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rfic.eecs.berkeley.edu

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rfic.eecs.berkeley.edu

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