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Why is a balance modulator used?
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.
What does a product modulator do?
A modulator (also called a mixer when it is used as a frequency changer) is closely related to a multiplier. The output of a modulator is the instantaneous product of the signal on one of its inputs (known as the signal input) and the sign of the signal on the other input (known as the carrier input).
What is the function of product modulator?
The output of a modulator is the instantaneous product of the signal on one of its inputs (known as the signal input) and the sign of the signal on the other input (known as the carrier input).
What is the function of the modulator?
The modulator ensures that the signals transmits from one part to another. It ensures that the input signals are modulated in the required manner. Modulation is the first initial step in signal transmission. Modulation is needed so that we can transmit multiple signals over a single channed.
What do you need to know about a balanced modulator?
A balanced modulator is a device that modifies a signal, usually in the form of an amplitude modulated (AM) radio signal. It takes the original signal that has both sidebands and a carrier signal, and then modulates it so that only the sideband signals come through the output modulator.
How is carrier suppressed in a balanced modulator?
Thus carrier is suppressed . When modulating signal is applied , the currents i_d1 andi_d2flow in the primary of T_3 due to carrier signal as well as the modulating signal. The FET currents due to carrier are equal and opposite and cancel each other .
How is DSB output produced by a balanced modulator?
Since the modulating signal is applied 180 0 out of phase at the gates , the FET currents due to modulating signal are equal but not opposite , hence do not cancel each other. Therefore , output is produced at the secondary of the transformer T 3 .Thus DSB output is produced by FET balanced modulator.
What’s the difference between a balanced modulator and an analog mixer?
Basic analog mixer designs tend to include the carrier in the output, whereas a balanced modulator is one which is designed to “suppress” the carrier.