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> Signal Generation Circuits
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Signal Generation Circuits
SPICE simulations of Every Tipologies of Oscillators, Multivibrators circuits, Sawtooth Generators, Squarewave, Triangular wave Generators,Strobe circuits, etc
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Pulse Width Modulator
Created by NiMultisimDesigner, published on 30-09-2012
a PWM circuit is a good solution to control the amount of power to a load, acting on the duty cycle on-off of the switching. In this project a 7414N Schmitt input inverter is connected as simple oscillator.The frequency oscillation is about 1/(6.28*R*C). This oscillator feeds the clock of a 4 bit counter 74HC163.The outputs counter generates the sequence 0000 to 1111 continuously with voltage from 0V to 5V, that feed a weighted summer amplifier implemented with the first LM324 operational amplifier.its output is a negative value increasing in absolute value. The second LM324 multiplies the value by -1/2 generating a triangle positive waveform.This output with a DC level signal are the inputs of a comparator to generate the PWM signal.
FREE
(only to registered users)
Project Type: Free
Complexity Spice Software Software Version Full version Components number Simple NI Multisim 11+ No 11-20 -
Transistors Representation of the timer 555
Created by LTspiceDesigner, published on 14-08-2012
transistors level representation of the versatile timer usable as monostable, bistable, oscillator, in Pulse Width Modulation applications, etc.
FREE
(only to registered users)
Project Type: Free
Complexity Spice Software Software Version Full version Components number Intermediate LTspice IV No 51-100 -
NE555 timer application
Created by Velocity64, published on 16-05-2012
Timer circuit NE555 oscillator and pulsed timer. Constant frequency variable pulse length timer.
FREE
(only to registered users)
Project Type: Free
Complexity Spice Software Software Version Full version Components number Documents Simple LTspice 4.14p No 11-20 1 -
10 Mhz BJT Colpitts Oscillator
Created by TopSpiceDesigner, published on 01-05-2012
Colpitts oscillator with a low power NPN BJT MPS3903
FREE
(only to registered users)
Project Type: Free
Complexity Spice Software Software Version Full version Components number Simple TopSpice 8.18+ No 11-20 -
Short Channel CMOS Schmitt Trigger
Created by JacobBaker, published on 11-04-2012
This circuit has a transfer curve similar to the CMOS inverter transfer characteristics with the exception of a hysteresis region. It is useful in generating clean pulses from a noisy input signal or in the design of oscillator circuits.
FREE
(only to registered users)
Project Type: Free
Complexity Spice Software Software Version Full version Components number Simple LTspice IV No 11-20 -
Waveforms Generator
Created by LTspiceDesigner, published on 23-03-2012
A square, triangle and sine waveform generator with two operational amplifiers modeled with a universal operational amplifier model.
FREE
(only to registered users)
Project Type: Free
Complexity Spice Software Software Version Full version Components number Simple LTspice IV No 11-20 -
SPICE modeling of VCO with MC12148
Created by LTspiceDesigner, published on 15-02-2012
Voltage Controlled Oscillator that requires an external L-C tank circuit to fix the oscillation frequency. A varactor diode may be used into the tank circuit to provide a voltage variable input for the oscillator. This device is designed for PLL and for applications where a variable frequency clock of high spectral purity is required
FREE
(only to registered users)
Project Type: Free
Complexity Spice Software Software Version Full version Components number Intermediate LTspice IV No 31-50 -
Ring Oscillator with odd number of CMOS Inverters
Created by JacobBaker, published on 09-02-2012
this astable circuit, called ring oscillator, is widely used in PLLs or as clock signal in digital circuits. The oscillator consists of a chain of odd number of CMOS inverters that generate an oscillation with a period T equal to 2* N* tp, where N is the number of inverters, and tp is the propagation delay (2 because each inverter switches twice during one period). For a tp equal to 25ps and N=11 we get an oscillation frequency of about 2 GHz
FREE
(only to registered users)
Project Type: Free
Complexity Spice Software Software Version Full version Components number Intermediate LTspice IV No 21-30 -
Signal generator with MC68HC11A8
Created by EDWin2011, published on 16-01-2012
Signal wave generator with motorola MC68HC11A8 and a first order Bessel low pass filter. The circuit generates a sine wave, a square wave, a triangular wave and a positive spike signal. One of the output of microcontroller Port C is the square waveform.The low pass filter is used to convert the square waveform to a sine waveform. The integrator configuration of the operational amplifier converts another square waveform to a triangular wave. The frequency is set by sizing the components value according to the formula fo= 1/(6.28*R1*C1). A differentiator circuit is used to convert a square wave to a spike waveform
FREE
(only to registered users)
Project Type: Free
Complexity Spice Software Software Version Full version Components number Documents Intermediate EDWinXP 1.80+ No 11-20 1 -
Signal Generator with 8 bit DAC
Created by ProteusDesigner, published on 27-11-2011
Sine signal generator with a timer 555, two synchronous 4 bit counters 74LS161,a 74LS04 inverter, a 2716 programmable EPROM and a 8 bit digital analogic converter ZN426. The output is filtered by a low pass filter.
FREE
(only to registered users)
Project Type: Free
Complexity Spice Software Software Version Full version Components number Intermediate Proteus 7+ No 21-30
