This application note introduces the circuit techniques for clock sources.
The document addresses the design challenges of creating accurate and stable clock sources, noting that while quartz crystals are standard, their circuitry can be complex. It details several oscillator topologies, ranging from simple CMOS Schmitt trigger gate oscillators to more robust discrete component versions suitable for frequencies up to 20MHz.
| Gate Oscillator Frequency Range | 2MHz to 20MHz |
|---|
The free running frequency should be set 5% to 10% above crystal resonance.
All preceding circuits typically provide temperature coefficients of 1ppm/°C.