Abstract
Two new electronic tuning current-mode square-wave generators are introduced in the ensuing paper. In the first proposed square-wave generator circuit, one Operational Trans-resistance Amplifier (OTRA) and two passive components are involved, along with two NMOS depletion mode transistors. This circuit generates a square-wave with almost equal and fixed duty cycles. The second proposed circuit is able to control both on-duty and off-duty cycles independently with the help of two passive components, two NMOS depletion mode transistors, and two diodes connected to the circuit. The frequency of the proposed circuits can be adjusted with the passive components connected to the circuit. Moreover, electronic tuning can also be achieved with the proposed circuits. The measured results that are included in the paper show the linear variation of a time period as compared with existing OTRA based square waveform generator. The performance of the proposed circuits is examined while using SPICE models. These circuits are built on a laboratory breadboard using commercially available Current Feedback Operational Amplifier (AD844 AN) and passive components are connected externally and tested for square waveform generation. The obtained results demonstrate good agreement with the theoretical values.
Highlights
The square-wave generator is widely operated in many electronic fields, such as digital, instrumentation, and communication systems
The proposed circuits are able to overcome the non-linear variation of the time period with respect to the passive components
An equivalent circuit model of the operational transresistance amplifier (OTRA) built with two current feedback amplifiers (CFAs) is shown in Figure 7a to consider the non-ideal and parasitic effects on the proposed circuits
Summary
The square-wave generator is widely operated in many electronic fields, such as digital, instrumentation, and communication systems. Square-wave generators with single CCII+ were proposed in [20] These waveform generators have three operational transconductance amplifier (OTA). The oscillation frequencies of these circuits are in [22].toThe advantage this square-wave waveform generator would that itoperational can controltransconductance the amplitude and limited only few kHz.ofThe generator usingbethree frequency independently by changing the resistance or changing the biasing current. This amplifier (OTA) and three passive components was proposed in [22].
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