How does balanced modulator suppress the carrier?
In electronic communications, a balanced modulator is a circuit that produces double-sideband suppressed-carrier (DSBSC) signals: It suppresses the radio frequency carrier thus leaving the sum and difference frequencies at the output. This results in power saving during signal transmission.
What are balanced modulators?
A balanced modulator mixes the audio signal and the radio frequency carrier, but suppresses the carrier, leaving only the sidebands. The output from the balanced modulator is a double sideband suppressed carrier signal and it contains all the information that the AM signal has, but without the carrier.
What are the two types of balanced modulator?
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.
What type of balanced modulator using diodes and transformers explain its operation?
Balanced Modulator Using Diodes Thus, if two non-linear devices such as diodes, transistors etc. The modulating signal x(t) is applied equally with 180o phase reversal at the inputs of both the diodes through the input center tapped transformer . The carrier is applied to the center tap of the secondary .
What is the main function of a balanced modulator?
Balanced modulator is used to suppress carrier signal to create an SSB or DSB. Explanation: Balanced modulator is used to produce 100% modulation.
How carrier is suppressed in DSB SC?
Double-sideband suppressed-carrier transmission (DSB-SC) is transmission in which frequencies produced by amplitude modulation (AM) are symmetrically spaced above and below the carrier frequency and the carrier level is reduced to the lowest practical level, ideally being completely suppressed.
Where is modulation done?
The modulation is done at the carrier signal while transmitting that signal. Hence the carrier signal properties get modulated. The receiver section demodulates the modulated signal to extract the original signal.
What is suppressed carrier balanced modulator?
Suppressed carrier balanced modulators may use BJTs, FETs or diodes. Figure 2 gives the basic circuit of suppressed carrier balanced modulator using BJTs. In figure 2, the carrier voltage c c is applied in parallel to the input of the two matched transistor Q1 and Q2 whereas the modulating voltage is applied in pushpull to the same two transistors.
What is a balanced modulator?
Background In electronic communications, a balanced modulator is a circuit that produces double-sideband suppressed-carrier (DSBSC) signals: It suppresses the radio frequency carrier thus leaving the sum and difference frequencies at the output.
What is a double sideband suppressed carrier?
Double Sideband Suppressed Carrier (DSB-SC) Modulation. Definition: DSB-SC is an amplitude modulated wave transmission scheme in which only sidebands are transmitted and the carrier is not transmitted as it gets suppressed. DSB-SC is an acronym for Double Sideband Suppressed Carrier.
What is the function of diodes in a ring modulator?
The diodes used in the diode ring modulator can either be silicon, silicon Schottky-barrier or gallium-arsenide. They serve as switches that control whether the input signal is passed with or without a 180° phase reversal. The carrier signal is the one that sets the diodes on and off at a high rate of speed.