The schematic diagram shown in the figure below show a function generator circuit using CA3130 in the integrator the threshold detection sections. Both triangular and square-wave signal are available from this circuit’s output, ranging from 0.1Hz to 100KHz (1:1000000 ratio). This frequency adjustment is done only by a single control R1. A voltage control input is available for externally-controlled frequency sweep.
The core of this function generator circuit is an operational-transconductance-amplifier (OTA) CA3080A, operated as a voltage-controlled current source. The current output Io is applied directly to an integrator IC2, and this integrator produce a triangular waveform. The potentiometer R2 is used to adjust the symmetry of the positive and negative ramp.
The controlled switch constructed around IC3 (CA3130) set the excursion of the triangular output from the integrator, with C2 capacitor to optimize the high-frequency square-wave output performance.
Potentiometer R3 is used to fine tune “amplitude symmetry” of the square-wave output signals. The output of the threshold detector IC3 is fed back through resistor R4 to the input of lC1 to toggle the current source from plus to minus in generating the linear triangular wave. [Circuit's schematic diagram source: Harris Semiconductor's CA3130 Application Notes]
Possibly Related Articles:
- Function Generator – Video Tutorial
This is a video tutorial for Function generator. This video explains how to use function generator and how it works. The function generator is used to generate waveform. The waveform... - High Frequency Waveform Generator
Waveform generator is very useful in electronic experiment and design. This circuit generate sine wave oscillation, but actually we can modify the circuit to generate triangle or square wave function.... - Variable Frequency Sinewave Generator
This sine wave generator is adjustable between 15 Hz to 150 kHz. The circuit is basically a Wien-bridge oscillator, with multiple capacitor selection. Here is the schematic diagram: A stereo... - High Performance Sawtooth Generator
This is a simple sawtooth generator circuit. The advantages of this circuit are low cost and produces an auxiliary square wave at the same frequency. This circuit can be used... - Pulse Generator (Oscillator) With Adjustable On-Off Period Using CA3130 Op-Amp
One of the interesting features of CA3130 op-amp is its high input resistance, because using such high input resistance, we can build an astable multivibrator with high R/C ratios. The...
| 
