Introduction -- Part I Theoretical background on Oscillators and Time References -- Oscillators and Time References -- Jitter and Phase Noise in Oscillators -- Long-term Oscillator Stability -- Part II Oscillator Designs for Temperature and Voltage Independence -- Design of two Wien Bridge Oscillators -- The Pulsed Oscillator Topology -- Injection-Locked Oscillators -- Oscillator-Based Sensor Interfaces -- Part III Wireless Sensor Nodes -- Design of a Low-power Wireless RFID tag -- Conclusion.