Today we look at how to generate a pair of quadrature signals from the output of a crystal oscillator using a pair of d-type flip-flops, as well as discussing the advantages and disadvantages of this technique.
Ever wonder what goes in to the design of a crystal oscillator? We’ll examine the operational theory of crystal oscillators, and design a discrete Pierce crystal oscillator suitable for use as a local oscillator in an HF receiver.
My discrete Pierce oscillator design tool can be found here; references and additional reading are listed below!
|Oscillator circuit design and crystal loaded Q analysis||Crystal Oscillator Circuits, Robert J. Matthys, Chapters 5.8, 6.1, 10.9|
|Pierce oscillator negative resistance and gain margins||Understanding Quartz Crystals and Oscillators, Ramon M. Cerda, Chapters 9.2, 9.4|
|Pierce oscillator crystal drive level equations||Intel application note AP-155 (Oscillators for Microcontrollers), Appendix A|