Dc Accurate Fsk Modulator - Rf Micro Devices

A typical, low cost, FSK Modulator TA0038 is implemented by injecting the modulation voltage into the phase lock loop of the Carrier synthesizer. This is done in two ways, by summing the modulation voltage and the loop error voltage together and applying that to a VCO tun- ing port. Or, by using a separate tuning port usually having lower sensitivity to voltage changes. The modu- lating data would change the Carrier frequency by a predetermined amount (deviation). This, however, causes a frequency error within the PLL that the loop begins to correct for. The effect of the loop correcting for the frequency errors caused by the modulation is analogous to passing the modulating signal through a high pass Filter Lower frequency components of the modulation signal get filtered off (or even eliminated). This results in unreliable Communications for random data streams, especially for long strings of non-chang- ing bits. By RF Micro Devices
TA0038 's PackagesTA0038 's pdf datasheet

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TA0038 Application circuits
TA0038 circuits
This is one application circuit of TA0038,If you need more circuits,please download TA0038's pdf datasheet.

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