# Bpsk Modulation Circuit Diagram

By | March 25, 2023

## BPSK Modulation Circuit Diagram

Binary phase-shift keying (BPSK) is a modulation technique in which the phase of a carrier wave is shifted by a predetermined amount, depending on the binary data to be transmitted. The two possible phase shifts are 0° and 180°, which correspond to the binary digits 0 and 1, respectively.

The BPSK modulation circuit diagram is shown below. The input to the circuit is a binary data stream, which is represented by a square wave. The square wave is then passed through a phase modulator, which shifts the phase of the wave by 0° or 180°, depending on the value of the binary data. The output of the phase modulator is a modulated carrier wave, which can be transmitted over a communication channel.

The BPSK modulation circuit is a simple and efficient way to transmit binary data over a communication channel. However, it is not as spectrally efficient as other modulation techniques, such as quadrature phase-shift keying (QPSK).

Here are some of the advantages of BPSK modulation:

• It is a simple and inexpensive modulation technique to implement.
• It is relatively robust to noise and interference.
• It is a good choice for applications where data rate is not critical.

Here are some of the disadvantages of BPSK modulation:

• It is not as spectrally efficient as other modulation techniques.
• It is more susceptible to phase noise than other modulation techniques.

BPSK modulation is used in a variety of applications, including wireless communication, satellite communication, and cable television.

##

BPSK Modulation Circuit

The BPSK modulation circuit consists of the following components:

• A binary data source
• A square-wave generator
• A phase modulator
• A carrier oscillator
• A low-pass filter

The binary data source generates a stream of binary data, which is represented by a square wave. The square wave is then passed through a phase modulator, which shifts the phase of the wave by 0° or 180°, depending on the value of the binary data. The output of the phase modulator is a modulated carrier wave, which is then passed through a low-pass filter to remove any unwanted harmonics. The filtered signal is the output of the BPSK modulation circuit.

##

BPSK Modulation Equations

The BPSK modulation equations are as follows:

• $$s(t) = Ac\cos(2\pi fct + \phi)$$
• $$\phi = 2\pi fdt$$

where:

• $$s(t)$$ is the modulated carrier wave
• $$Ac$$ is the amplitude of the carrier wave
• $$fc$$ is the frequency of the carrier wave
• $$fd$$ is the data rate
• $$\phi$$ is the phase shift
##

BPSK Modulation Example

Let's say we have a binary data stream of 10101010. The corresponding square wave would be as follows:

 0 1 0 1 0 1 0 1 0 

The phase shifts for this data stream would be as follows:

 0 180 0 180 0 180 0 180 0 

The modulated carrier wave would be as follows:

` +--+-+--+-+--+-+--+ | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | +--+-+--

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