FSK demodulation can be either coherent or noncoherent. Coherent detection always demands carrier and bit synchronization, typically achieved using phase-locked loops (PLLs). PLLs are very noise ...

This article investigates the demodulation capabilities of a DSSSsuper-regenerative ... we demonstrate that afew modifications on the basic architecture make it useful for ASK,FSK and PSK detection.

These higher level FSK methods of modulation and demodulation are difficult to implement so are a general pain to use. But CML Microcircuits now has their CMX7164 IC, a modem that includes full ...