By Allen A Sweet B.S. M.S. Ph.D.
Radio frequency built-in circuits (RFICs) are an incredible a part of contemporary instant communications units and infrastructure. An RFIC layout technique concerning state of the art bipolar applied sciences (GaAs HBT or SiGe HBT) has won recognition between engineers because of its skill to maximise functionality; besides the fact that, it's been principally overlooked in specialist reference books. This booklet fills the distance, delivering practitioners a close remedy of this more and more very important subject. From discussions of key functions (Bluetooth, UWB, GPS, WiMax) and architectures...to in-depth insurance of fabrication applied sciences and amplifier design...to a glance at functionality tradeoffs and construction bills, this publication hands engineers with entire layout knowledge for his or her tough paintings within the box.
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Extra info for Designing Bipolar Transistor Radio Frequency Integrated Circuits (Artech House Microwave Library)
This ability of the I/Q receiver to not distort the digital phase information is measured by a parameter called error vector magnitude (EVM). EVM combines the effects of mixer nonidealness and LO phase noise into one parameter that measures a receiver’s ability to reproduce the information contained in a digital phase-modulated signal without introducing significant distortion causing bit errors. Only by combining a very low-noise-figure LNA with an extremely well-balanced pair of Gilbert cell mixers and a low-phase-noise LO signal split into an in-phase component and a quadrature-phase component (phase-shifted by 90º) can low EVM and low BER be achieved for any or type of phase modulation.
At present, the 10 fs requirement cannot be achieved with existing VCOs. However, the miniature YTO design discussed in Chapter 13 is capable of about 100 fs of jitter at 12 GHz. Perhaps with device improvements and/or increased YIG resonator Qs, this class of oscillators could approach 10 fs performance. Using such techniques, it is conceivable that a cognitive radio could be designed whose only analog content would consist of an LNA and a PA. Such an all-digital radio would be truly software defined in every sense of the word.
High Q) image-rejection filter is used with receivers that operate with a low IF frequency. sive filters perform very well. 14, the image frequency, the LO frequency, and the RF input frequency are now very close together. This means that in order to be truly effective, the image filter must be very sharp so that it can pass the RF input signal with little or no attenuation but still have adequate rejection at the now close by image frequency. This no-win filter dilemma led receiver designers to an architectural concept called the double-conversion superheterodyne receiver.