BPSk

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By 10 Comments
Binary Phase Shift Keying (BPSK) modulation
using CD4016 with Simulated output
waveform
Khaleel
In binary phase shift keying (BPSK) modulation scheme, the phase of a carrier is changed in
accordance with the digital pulse signals. BPSK modulator is basically a phase modulator. Here
the transmitted signal is a sinusoid of fixed amplitude. It has one fixed phase when the data is at
one level and when the data is at the other level, phase is shifted by 180 degree. Binary phase
shift keying method has variety of applications in digital communications systems such as the
wireless LAN standard, IEEE 802.11, digital modems, wireless telephone networks etc.
Differential phase shift keying (DPSK) is an other type of phase shift keying technique which
depends on the difference between successive phases. DPSK is significantly simpler to
implement than ordinary PSK , since there is no need for the demodulator to have a copy of the
reference signal to determine the exact phase of the received signal (it is a non coherent
scheme). Here is the practical circuit of BPSK, it is build around CD4016 and 741 Op amp.Also
read: Binary Amplitude Shift Keying(BASK)
BPSK Circuit Diagram
Components Required
1. Resistors (10kΩ)
2. 741 Op Amp
3. CD 4016 IC
4. Not Gate 7404
PSK Output Waveform
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2. 3/4/2016 Binary Phase Shift Keying (BPSK) modulation using CD4016 with Simulated output waveform ­ Circuits Gallery
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Working
An Op amp inverting amplifier with gain 1 is used to invert the phase of the input sine
wave.
Sine wave can be obtained from a function generator or by using a RC phase shift
oscillator.
Two switches inside the quad analog switch CD 4016 are used in the circuit.When the
enable input of one gate is high, the input will appear at the output.
When the binary data is 1, sine wave is switched to output because the sine wave is
connected to 1 switch and the binary data is applied to enable pin (13 pin) of 1 switch.
When binary data is 0, the 1 switch is disabled and 2 switch is enabled using NOT gate
arrangement. Thus we get an inverted sine at the output.
The output pins of both first and second switches are shorted and the output is taken from
it. The block diagram is self explanatory.
Components Pin out
st th st
st nd

3. 3/4/2016 Binary Phase Shift Keying (BPSK) modulation using CD4016 with Simulated output waveform ­ Circuits Gallery
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August 8, 2012 at 12:59 am
September 11, 2013 at 2:15 pm
September 12, 2013 at 1:01 pm
March 17, 2014 at 3:07 pm
February 24, 2015 at 3:24 pm
Related Circuits:
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(ASK)
10 thoughts on “Binary Phase Shift Keying (BPSK) modulation using CD4016
with Simulated output waveform”
Anonymous
Nice explnatn of the circuit..thanks
Reply
Anonymous
it doesn’t work properly. because the sin wave and digital binary is not synchronized. the bit duration should be as
same as sin wave period and also they should begin and end as same time.
Reply
admin
There is no scope of synchronization. It’s only an analog switch.
Reply
Mark
Wow, fantastic blog layout! How long have you been blogging for?
you make blogging look easy. The overall look of your
web site is wonderful, let alone the content!
Reply
richard
is this IC is possible to use for qpsk modulator?

4. 3/4/2016 Binary Phase Shift Keying (BPSK) modulation using CD4016 with Simulated output waveform ­ Circuits Gallery
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April 7, 2015 at 2:47 pm
April 14, 2015 at 11:13 am
July 22, 2015 at 12:22 am
July 24, 2015 at 1:49 pm
August 10, 2015 at 1:13 pm
Reply
Luiz Vercosa
Very cool! Thank you!
Reply
krishna
frequency range?
Reply
sreelekshmi
thank u……….
Reply
Habeesha
Hi Sreelekshmi,
Welcome
Reply
Fida
Hello,
This is nice. do you also have a Demodulator idea/ circuit ?
Thank you
Reply
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