4G - Wireless Beyond Third Generation Message Board

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Technology Stocks : 4G - Wireless Beyond Third Generation

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From: waitwatchwander	10/3/2007 10:47:33 AM
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Refinements in handset power control will be critical in all 4G implementations. This snipit outlines two key elements that need to be championed for success. RF Power Amplifier Theory 4.1 Introduction The RF power amplifier (PA), a critical element in transmitter units of communication systems, is expected to provide a suitable output power at a very good gain with high efficiency and linearity. The output power from a PA must be sufficient for reliable transmission. High gain reduces the number of amplifier stages required to deliver the desired output power and hence reduces the size and manufacturing cost. High efficiency improves thermal management, battery lifetime and operational costs. Good linearity is necessary for bandwidth efficient modulation. However these are contrasting requirements and a typical power amplifier design would require a certain level of compromise. There are several types of power amplifiers which differ from each other in terms of linearity, output power or efficiency. ... 4.7 Power Amplifier Classification There are several types of power amplifiers and they differ from each other in terms of their linearity, efficiency and power output capability. The first step in designing a power amplifier is to understand the most important design factor and choose the power amplifier type most suited for that purpose. For example, linearity and efficiency are the most important characteristics of the power amplifier design for mobile communication systems. Beside that high linearity results in poor efficiency and vice versa. Taken from ... Design a Highly Linear Power Amplifier Based on HBT Paul Saad - June 2006 Master’s Thesis in Electronics/Telecommunication Examiner: Prof. Daniel Rönnow av.it.pt (94 somewhat technical pages)

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