written 8.3 years ago by |
The balanced modulators are used to suppress the unwanted carrier in an AM wave.
The carrier and modulating signals are applied to the inputs of the balanced modulator and we get the DSB signal with suppressed carrier at the output of the balanced modulator.
Thus the output consists of the upper and lower side bands only.
Principle of operation:
The principle of operation of a balanced modulator states that if two signals at different frequencies are passed through a “nonlinear resistance” then at the output we get an AM signal with suppressed carrier.
The device having a nonlinear resistance can be diode or a JFET or even a bipolar transistor.
Types of balanced modulator:
The suppression of carrier can be done using the following balanced modulators:
Using the diode ring modulator or lattice modulator.
Using the FET balanced modulator.