Based on OrCAD / PSpice A signal generator circuit design -OrCAD/PSpice, circuit - HC network broadcasting industry

Signal circuit of the role is to produce a certain frequency and amplitude of the sine wave, square wave and sawtooth wave, etc.. Signal circuit widely used in Communicate Systems, digital systems and automatic control system. OrCAD / PSpice as a powerful Electronic Circuit simulation software, it can according to the given circuit structure and parameters of the basic circuit performance analysis, it does not require any actual components used to design various features of the pre-application to replace a large number of instruments. Circuit design workers can carry out all these applications analysis, calculation and verification, a special circuit to complete the necessary work. In the PSpice environment, this signal generator circuit to achieve a sine wave, square wave and sawtooth A Design and Application of PSpice simulation and analysis was carried out.

1OrCAD/PSpice Introduction OrCAD / PSpice is one of the earlier emergence of the EDA software, the software from the schematic editor, circuit simulation, incentive edit, parts library editor, waveform, and several other modules, when used as a whole, but each Some have their own window. Designers use the mouse and hot keys with operations, not only enhance the work efficiency, but also shorten the design cycle. It is full-featured universal simulation software, integrated DC analysis, AC analysis, noise analysis, transient analysis, temperature analysis simulation. Software also integrates a number of mathematical operations, not only provides users add, subtract, multiply, divide, and other basic mathematical operations, also provides sine, cosine, absolute value, logarithmic, exponential, and other basic computing functions, these are other software can not match. In addition, designers can also edit the simulation results window, such as adding a window, modify the coordinates, overlay graphics, etc., also has a save and print graphics capabilities to users Make Graphics requirements faster, easier way.

2 signal circuit design with OrCAD / PSpice analysis 2.1 Wien Bridge Sine Wave Oscillator Wien bridge sine wave oscillator circuit to produce the oscillation frequency adjustment range, a good sine wave is widely used in communications systems. Wien bridge sine wave oscillator by a Wien bridge and an integrated operational amplifier A741 formed integral with the phase amplifier circuit, shown in Figure 1. Wien bridge the two arms of a parallel RC network of strings, the other two arms by the amplifier feedback resistor composition. So that R1 = R2 = R, C1 = C2 = C, R3 + R4 = Rf, according to Wien bridge sine wave oscillator oscillation conditions can be introduced amplifier voltage gain Av = 1 + Rf/R5 3, the Rf 2R5. Will figure in the PSpice environment R5 of the SET property is set to 0.14, the conditions can be met. Wien bridge sine wave oscillator theory of oscillation frequency f0 = 1 / (2 RC). As Power supply Voltage fluctuations, changes in circuit parameters, environmental temperature and other factors, so that the output sine wave amplitude instability. Here diode to increase stability and speed from the vibration. Environment in PSpice transient analysis type and parameters setting (0 ~ 500ms) were analyzed, Vo the output waveform. The horizontal axis of time to 300 ~ 500ms, shown in Figure 2. Observed from the vibration time is about 400ms, using the ruler (Cursor) measuring the waveform of the oscillation period T = 460.011-453.755 = 6.256ms, find the oscillation frequency. Also calculate the theoretical oscillation frequency, we can see that the error is small.

2.2555 square wave oscillator circuit

Use of multi-purpose single-chip integrated circuit 555 square wave oscillator circuit shown in Figure 3. After power on, power supply V1 through R1, R2 to the capacitor charge, C point voltage Vc increased exponentially. When Vc up to (2 / 3) V1, due to 555 within the comparator circuit and the trigger role in starting capacitor C1 discharges through R2 until the Vc decreased to (1 / 3) V1 time, they began to repeat the charge discharge to form the non-steady-state multi-harmonic oscillation.

About The Author The e-commerce company in China offers quality products such as Slurry Pump EMM , china Sludge Pump EZG, and more. For more , please visit Mortar pump today!