Download RF CMOS power amplifiers.Theory,design and implementation by Mona M. Hella, Mohammed Ismail PDF

By Mona M. Hella, Mohammed Ismail

RF CMOS energy Amplifiers: idea layout and Implementation makes a speciality of the layout method and the trying out problems with CMOS RF energy amplifiers. this is often the 1st monograph addressing RF CMOS energy amplifier layout for rising instant criteria. the focal point on energy amplifiers for brief is distance instant own and native quarter networks (PAN and LAN), but the layout innovations also are acceptable to rising huge quarter networks (WAN) infrastructure utilizing micro or pico mobile networks. The e-book discusses CMOS strength amplifier layout rules and thought and describes the architectures and tardeoffs in designing linear and nonlinear energy amplifiers. It then info layout examples of RF CMOS strength amplifiers for brief distance instant functions (e, g., Bluetooth, WLAN) together with designs for multi-standard structures. layout elements of RF circuits in deep submicron CMOS also are mentioned. RF CMOS energy Amplifiers: conception layout and Implementation serves as a reference for RF IC layout engineers and RD and R&D managers in undefined, and for graduate scholars engaging in study in instant semiconductor IC layout quite often and with CMOS know-how particularly.

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Extra resources for RF CMOS power amplifiers.Theory,design and implementation

Example text

3, and can be determined by solving a set of nonlinear equations reported in [43], [44]. 1 Driver Stage Design A main issue in class E power amplifier design is the generation of the input signal by a driver stage to turn the transistor on and off. Ideally a square waveform should be applied to the output stage to avoid long transition times from one switching state to another. This square wave generation can be either done using an inverter, a class F amplifier, or a pseudo class E pre-driver stage.

Since each stage will consume a certain amount of power, the overall power consumption will increase, thus decreasing the overall efficiency. While power efficiency is a performance issue, Linearity is imposed by the utilized modulation technique, or the level of output power back-off during operation. Most power amplifiers employ a two-stage configurations, with matching network placed at the input, between the two stages, and at the output. Since the output stage typically exhibits a power gain of less than 10dB, a high-gain driver is added so as to lower the minimum required input level.

It employs relatively linear amplifiers, which are known to have lower efficiency at lower power levels. It is used to preserve the peak efficiency at back-off points in modulation schemes that have high peak to power ratio. This means that a given level of Linearity, or spectral re-growth, at a given level of mean RF power can be achieved using the same device periphery but at substantially higher efficiency than in simple open-loop configuration. The principal of the Doherty amplifier is to use one main power amplifier (PA) and one auxiliary PA.

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