Our Latest News

Bridge, phase shift and double-T RC oscillation circuits are commonly used to generate sinusoidal signals

I think we are not unfamiliar with the signal “sine wave”, but as for how to generate it, we may not know much about it. There are many circuits to generate sine waves, commonly used are bridge, phase shift and double-T RC oscillation circuits.

Bridge type

Phase-shift type

Double-T type RC oscillation circuit

Due to space limitations today we will just introduce the bridge type, the bridge circuit is relatively simple compared to the following two, the left side of the two R (resistor) C (capacitor) actually play the role of frequency selection is to select the frequency of the generated sinusoidal signal, where the calculation formula is

Formula

With the formula we can easily design the circuit we want to produce the desired frequency, the circuit Rf and R1 here acts as a signal amplifier, in the choice of time, Rf is about twice R1, but to be slightly greater than twice, just a little greater than the line, as to why this can be considered a necessary condition for the signal to vibrate, because we are actually no signal input. The signal we are using is the one obtained by closing the switch and giving the signal generator an interference signal to amplify it, which is why this condition is present.

As to why it is called a bridge, it is because after the arithmetic is removed, the remaining circuit is exactly like a Wheatstone bridge.

Bridge circuit

Isn’t it, here it is very much like that, and what’s more when designing it it is best to ensure that the resistor values of the frequency selector circuit on the left are equal, seeing the circuit diagram we can also see that it is best to satisfy this condition, after the circuit is successfully built it will produce a sine wave signal, however as the values of the resistor and capacitor are fixed so the frequency produced is also fixed, if we want to produce a circuit with a variable frequency we can do so by changing the If we want to generate a circuit with a variable frequency, we can do so by changing the value of the resistor, i.e. replacing R with a potentiometer, so that we can generate the random sine wave frequency we want.

This circuit is relatively simple and I think those who have been in contact with the circuit will probably be able to understand it.

    GET A FREE QUOTE

    FPGA IC & FULL BOM LIST

    We'd love to

    hear from you

    Highlight multiple sections with this eye-catching call to action style.

      Contact Us

      Exhibition Bay South Squre, Fuhai Bao’an Shenzhen China

      • Sales@ebics.com
      • +86.755.27389663