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Active and Passive Electronic Components, September 2004, Vol. 27, pp. 155159
 

Summary: Active and Passive Electronic Components,
September 2004, Vol. 27, pp. 155159
CURRENT-CONTROLLED SAWTOOTH GENERATOR
MUHAMMAD TAHER ABUELMA'ATTI* and MUNIR KULAIB ALABSI
King Fahd University of Petroleum and Minerals, Box 203, Dhahran 31261, Saudi Arabia
(Received 7 June 2003; In final form 28 July 2003)
A simple current-controlled sawtooth generator is presented. Both the amplitude and the frequency of the generated
sawtooth can be current-controlled. The circuit uses off-the-shelf components. Experimental results are included.
Keywords: Function generators
1 INTRODUCTION
Sawtooth and pulse generators find numerous applications in many diverse fields, for example,
in instrumentation, measurement and control. In most of the existing sawtooth generators, a
grounded capacitor is charged at a pre-specified rate using a constant-current source, and
then rapidly discharged through a transistor switch [15]. However, while electronic control
of the frequency is available in some of the circuits, none of the available circuits can simul-
taneously provide electronic control of the frequency and the amplitude. The purpose of this
article is therefore to present a simple sawtooth generator with electronic control of the
frequency and the amplitude.
2 PROPOSED CIRCUIT
The proposed circuit is shown in Figure 1. The operation of this circuit can be described as

  

Source: Al-Absi, Munir A. - Electrical Engineering Department, King Fahd University of Petroleum and Minerals

 

Collections: Engineering