Expt. No. 10

BOOTSTRAP SWEEP CIRCUIT

Objective: To study the operation of bootstrap sweep circuit using BJT.

Components and equipments required:

1. Oscilloscope (Scope/CRO).2. Function Generators (FG).3. DC power supply.4. Project Breadboard. 5. Resistors.6. Capacitors7. 1N4007 Diode8. SL100 BJTs / BEL100N/BC1079. Connection Wires. 10. Oscilloscope Probes.

Circuit diagram:

Fig. 1

Theory:

(Explanation about

a) Sweep circuit

b) Bootstrapping

c) Sweep error in the sweep circuits

Prepare yourself)

Design:

Reference: Pulse, Digital and Switching Waveform: Jacob Millman & Herbert Taub

Given that ( gate

signal frequency fg = 500Hz)

For the given BJT (SL100)

Choose (since Q1 act as a switch)

Sweep voltage

Current gain of emitter follower

Input impedance of emitter follower

Voltage gain of voltage follower

(Where fg frequency of gate signal

Slope error

Pre-lab Assignments:

1. The circuit shown in fig.1 has the following parameters:

The input gate

amplitude is 2V and period 5 . The transistor parameters

Evaluate a) sweep speed and maximum amplitude of the sweep b) retrace

time c) slope error d) plot the gate voltage, collector current of Q1and output voltage

Model Waveforms

Input and Output waveforms: