SPICE-Simulation using LTspice IV

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9. Project 5: Transistor circuits 9.1. One Stage Amplifier 9.1.1. Time Domain Simulation We need a power supply, a sine voltage source, one capacitor, four resistors and an npn-transistor. Let’s start! Procedure: Step1: Place 4 resistors, 1 capacitor, 2 voltage sources, 1 npn-transistor and wire. Step 2: Enter the correct values for the resistors and the capacitor. In the upper voltage source V2 choose „DC“ with an amplitude of +12V. The lower voltage source V1 must be programmed as a sine wave with Vpeak = 100mV and 1kHz. Step 3: Simulate from 0 to 10ms. Step 4: Start the search engine and look for BC547B.lib“ on the internet. The content of the found html-file must be marked, copied to the clipboard and inserted into a new sheet of a text editor. Save the file as „BC547B.lib“ in the folder LTC / LTspiceIV / lib / sub Step 5: Move the cursor to the information „NPN“ beside the transistor’s symbol, click right and enter the correct information „QBC547B“ (...because this is the same as the name of the Transistor’s model file in “BC547.lib”) and add the spice directive .include BC547.B to your schematic. 52
In the simulation we would like to see the input voltage, the base and the collector voltage of the transistor. Please verify the phase shift of 180 degrees caused by the transistor. Also we can test the “ predicted gain” for such a stage, given by the simple equation VU = RC / RE = 470 / 100 = 4,7 (to check this please measure the amplitude of the output voltage and calculate the ratio with the input voltage’s amplitude of 100mV). 53
Page 1 and 2: SPICE-Simulation using LTspice IV T
Page 3 and 4: 8. Project 4: U-I-Curves of Parts 4
Page 5 and 6: 1. Introduction Modern electronics
Page 7 and 8: 3.2. Presentation of Simulation Res
Page 9 and 10: 3.4. Changing Curve Colours A very
Page 11 and 12: Task: Make the voltage curve visibl
Page 13 and 14: Step 2: Enter the new border values
Page 15 and 16: 3.7. Differential Measurements Ever
Page 17 and 18: 3.9. Changing Part Values Now we wa
Page 19 and 20: 4.2. Changing Part Values This is d
Page 21 and 22: Now start the simulation, click on
Page 23 and 24: 4.3.3. The Impulse Response Fourier
Page 25 and 26: This is the correct presentation: -
Page 27 and 28: 4.4.2. Square Wave (f = 1691 Hz) St
Page 29 and 30: 4.5. Frequency Domain Simulation: A
Page 31 and 32: 5. FFT (= Fast Fourier Transformati
Page 33 and 34: Select Input Voltage V(n001) by a m
Page 35 and 36: 6.2. Important: creating SPICE Mode
Page 37 and 38: 6.2.2. Creation of the Symbol for a
Page 39 and 40: For an ideal transformer you can re
Page 41 and 42: Step 5: self-explainig…. 41
Page 43 and 44: -----------------------------------
Page 45 and 46: When simulating for 200ms, you will
Page 47 and 48: 8. Project 4: V-I-Curves of Parts 8
Page 49 and 50: 8.3. NPN Transistor In the „examp
Page 51: 8.4. N-Channel Junction FET First w
Page 55 and 56: 9.2. Two Stage Broadband Amplifier
Page 57 and 58: 9.2.4. DC Bias If you want to know
Page 59 and 60: 9.2.5. Frequency Domain Simulation:
Page 61 and 62: You will see this result and that a
Page 63 and 64: Using the cursor you will find the
Page 65 and 66: Let us now draw the complete circui
Page 67 and 68: 10.3. Use of Labels In general OP A
Page 69 and 70: 11. Project 7: DC-DC Converters Fir
Page 71 and 72: 11.2. The Step Up Converter The sch
Page 73 and 74: If you want: vary the gate voltage,
Page 75 and 76: 11.4. The Step Down Converter In th

SPICE-Simulation using LTspice IV

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