Series Voltage Generator

   Aim

    To simulate a transistor sweep generator circuit.

   Components

   Theory

    A simple Series Voltage Regulator is shown. The transistor Q1 is the series element, which controls the amount of input voltage that gets to the

    output. The zener diode provides the reference voltage. The regulating operation can be described as:

1. If the output voltage decrease the increased base-emitter voltage causes the transistor Q1 to conduct more, there by raising the output voltage. I.e. maintaining the output constant.
2. If the output voltage increases, the decreased base-emitter voltage causes transistor Q1 to conduct less, there by reducing the output. I.e. maintaining the output constant.

The output voltage is given by

where Vo is the output voltage

    V_Z is the zener brake down voltage.

 

    Procedure

    EDWin 2000 -> Schematic Editor: The circuit diagram is drawn by loading components from the library. Wiring and proper net assignment has

    been made. The resistor R is assigned a proper value.

    EDWin 2000 -> Mixed Mode Simulator: The circuit is preprocessed. The output may be obtained by performing DC Sweep Analysis. The waveform

    markers are placed at the input and output. The sweep parameter (voltage) for input source is set in the Analysis window. The applied voltage is

    swept from an initial value of 0 to final value of 15V in steps of 0.5V. The output is plotted against varying input. The waveforms are observed in the

    Waveform Viewer.

    EDWin 2000 -> EDSpice Simulator: The circuit is preprocessed. The output may be obtained by performing DC Transfer Function Analysis. The

    waveform markers are placed at the input and output. The sweep parameter (voltage) for input source is set in the Analysis window. The applied

    voltage is swept from an initial value of 0 to final value of 15V in steps of 0.5V. The output is plotted against varying input. The waveforms are

    observed in the Waveform Viewer.

                                                                                         

  

   Result

    The output waveform may be observed in the waveform viewer.