• 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:

1. Using the diode ring modulator or lattice modulator.

2. Using the FET balanced modulator.