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Part Number: TL712
In one of our designs, there are two signals:
1) A square wave with 0 to 30V and frequency 500 HZ
2) A sine wave with amplitude 25V, frequency 500HZ.
It is required to find the phase between these two. Please suggest the best way to implement this.
Thanks in advance.
There are several methods of phase detection. A simple method would be to subtract the analog signals to get a signal that its amplitude increases with increasing phase difference. But that would require both signals to be analog and equal amplitude and linearity. Not knowing enough about the details of your circuit, I can only comment that you probably need to step down and normalize the signal amplitudes and use a differential comparator for phase detection. Also you may want to convert the sine wave to a square wave using a comparator with very low prop delay, normalize the signal amplitudes and use XOR (exclusive OR) phase detection method.
A better way would be to use PLL (Phase -Locked loop) ICs such as CD4046. You need to condition the signals to the proper levels and connect them to the PLL IC as shown in the attached documents.
Thanks for considering TI products!
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