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 the balanced modulator explain its working principle?
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.
What is balanced modulator explain it to generate a DSB-SC signal?
Balanced modulator consists of two identical AM modulators. These two modulators are arranged in a balanced configuration in order to suppress the carrier signal. Hence, it is called as Balanced modulator. The same carrier signal c(t)=Accos(2πfct) is applied as one of the inputs to these two AM modulators.
What is the use of balance modulator?
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 inputs of balanced modulator?
Modulators (sometimes called balanced modulators, doubly balanced modulators, or even on occasions high level mixers) can be viewed as sign-changers. The two inputs, X and Y, generate an output W, which is simply one of these inputs (say, Y) multiplied by just the sign of the other (say, X), that is W = Y × sign(X).
What are the typical inputs and for a balanced modulator?
To put it simply, a balanced modulator is a mixer which has two inputs and two outputs. The outputs are (input1 + input2) and (input1 – input2). So, if the inputs are 100kHz and 1kHz, the outputs are 101kHz and 99kHz.
What are the typical inputs and outputs for a balanced modulator?
How are DSB-SC signals generated?
DSB-SC is generated by a mixer. This consists of a message signal multiplied by a carrier signal. The mathematical representation of this process is shown below, where the product-to-sum trigonometric identity is used.
Which modulator is used in DSB-SC?
The DSB-SC can be generated using either the balanced modulator or the ‘ring-modulator’. The balanced modulator uses two identical AM generators along with an adder. The two amplitude modulators have a common carrier with one of them modulating the input message , and the other modulating the inverted message .
What is block diagram of communication system?
The block diagram of a communication system will have five blocks, including the information source, transmitter, channel, receiver and destination blocks. 1.Information source :- The objective of any communication system is to convey information from one point to the other.
What is modulation example?
For example, the modulation signal might be an audio signal representing sound from a microphone, a video signal representing moving images from a video camera, or a digital signal representing a sequence of binary digits, a bitstream from a computer. The carrier is higher in frequency than the modulation signal.
What is the bandwidth of SSB?
300 Hz to 3,400 Hz
With SSB, channels could be spaced (usually) only 4,000 Hz apart, while offering a speech bandwidth of nominally 300 Hz to 3,400 Hz.
As we take a closer look, we find that balanced modulators suppress the unwanted carrier in an amplitude modulated (AM) wave and only produce sidebands. Along with eliminating the carrier, a balanced modulator also provides efficient use of power.
How does a balanced modulator produce DSB signal?
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.
How does a balanced modulator suppress the unwanted carrier?
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.
What is a computer’s block diagram?
Or you can say that, in computer’s block diagram, we will see how computer works from feeding the data to getting the result. Here is the block diagram of a computer system: In the above diagram, both control (control unit or CU) and arithmetic & logic unit (ALU) combinely called as Central Processing Unit (CPU).