Active RF Circuits, 5 op

Ydinsisältö

• RF transistor amplifiers: Transistor modeling using linear circuit parameters (Y, Z, S and ABCD), small-signal equivalent circuits, and nonlinear ("spice") models. Stability against oscillation. Impedance matching of two-ports, noise figure optimization, linearity.
• RF oscillator design: modeling an oscillator as 1) a positive feedback amplifier and 2) as a negative resistance device. Clapp-type (single transistor) and cross-coupled (two-transistor) oscillators. Frequency control using varactors (aka "varicaps" or "capacitance diodes") Crystal oscillators. Design rules-of-thumb and their origins.
• RF mixers: understanding mixer as 1) a circuit made of one or more switches 2) a circuit made of one or more nonlinear components. Active and passive mixers. Conversion loss/gain, mixing products (the wanted and unwanted output frequencies), linearity, port-to-port isolation.
• Larger entities: RF systems such as "receiver chain" and the "phase locked loop".

Täydentävä tietämys

• Matlab RF toolbox, RF circuit simulations. Aspects in practical implementations.
• Frequency stability, jitter and phase noise. DC-to-RF efficiency.
• Mixer noise figure.
• Other active RF circuits: frequency dividers, prescalers, frequency multipliers, phase detectors, the phase locked loop (PLL), modulators, demodulators.

Erityistietämys

• Oscillator design trade-offs and optimization.