Abstract
Aggressive silicon technology scaling, combined with immense unexplored MEMS potential, leads to new advancements in the field of low-power, high-performance RF-MEMS codesigned architectures. This chapter introduces the approach, theory, and design of an important block in RF transceivers: a quadrature voltage-controlled oscillator (QVCO) stabilized with bulk acoustic wave (BAW) resonators. A new time-varying source degeneration coupling mechanism has been used to quadrature-couple the two oscillator cores for I/Q signal generation, reducing the required headroom of the series coupling transistors. The phase accuracy of the quadrature outputs determines the image rejection capability of integrated RF front ends. To improve phase error in the presence of process mismatch, we introduce a self-calibration loop for phase control of quadrature oscillators. Design concerns like temperature stability of BAW-tuned oscillators are addressed. Side-by-side comparisons of the BAW- and LC-based oscillators are made, and assembly challenges are discussed.KeywordsPhase NoiseNegative ResistanceSwitching TransistorBulk Acoustic WaveQuadrature SignalThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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