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Use of PLL on in wireless transmission using sonar

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Gupsh

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Hi!
I am new to PLL and reading about it. I want to know If I use a PLL;in wireless transmission of data using sonar; as a clock for the storage unit on the receiver side instead of astable multivibrator with the frequency same as that of the clock on transmitter side. So, how can i use it and what problem does it solve over an astable multivibrator, if at all.
Please correct me if I am going wrong.
Thanks in advance!
 

goodboy_pl

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multivibrator and other simple oscillators suffer from drift due to aging, temperature deviations and supply voltage variations.
PLL resolves such problem with locking a vco with a low drift and precision XTAL oscillator(eg. tcxo). also by some modification it is possible to add modulation to the PLL but for your application I think DDS is better solution. it is very simple, very accurate and almost digital in nature so it could be easily programmed and used with digital processors or fpga.
for receiver path you need LNA, filters and ADC. Analog devices has several products, app. notes and solution related to ultra sound/sonar.

BEST REGARDS.
 

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