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AN67391 - PSoC® 1 - Low Distortion FSK Generator | Cypress Semiconductor

AN67391 - PSoC® 1 - Low Distortion FSK Generator

Last Updated: 
Nov 20, 2015

FSK is the modulation cornerstone of a number of digital data transmission systems. This application note provides a detailed implementation of FSK generator with very low distortion and zero CPU (M8C core) run-time usage. The design is demonstrated at 1200 Hz and 2200 Hz, Bell 202 standard.

This AN also talks about the method to reduce the 3rd and 5th harmonics by using a dead band PWM generator and a band-pass filter.

In order to be able to understand the functionality better, following pre-readings are suggested:

AN2168: Understanding switched capacitor filters - Discusses how low pass, band pass and notch filters can be implemented using switched capacitor blocks.

KB Article: Generation of non-overlapping signals using dead band PWM generator.


Example Project

Supported H/W and S/W Supported PSoC1 Devices
PSoC Designer Version H/W Kit CY8C20xxx CY8C21xxx CY8C22xxx CY8C23xxx CY8C24xxx CY8C27xxx CY8C28xxx CY8C29xxx
Yes 5.1 CY3210-PSoCEVAL1         x23A, x94 x43 x x66