Amplifier on a TDA7050 chip, 2x0,07 watts. Scheme, description

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Amplifier on a TDA7050 chip, 2x0,07 watts. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

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Amplifier on a TDA7050 chip, 2x0,07 watts

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2D transistor analog op amp 18.09.2020

A team of researchers from the Vienna University of Technology (Austria), the University of Pisa (Italy) and AMO (Germany), who successfully demonstrated a 2D microprocessor a few years ago, recently fabricated an analog operational amplifier using an atomically thin (2D) semiconductor, molybdenum disulfide (MoS2 ).

Thanks to the homogenous MoS2 film grown by chemical vapor deposition, it was possible to obtain transistors with excellent performance: low hysteresis, ON/OFF ratio exceeding 8 orders of magnitude, mobility up to 20 cm2/Vs. A test of more than 40 devices showed good reproducibility of these indicators with small variations in threshold voltage and charge carrier mobility.

These results allowed the authors to design a 4-stage device with a total gain of 40 decibels. It is based on n-channel field-effect transistors with a local rear gate and is one of the most complex analog circuits developed to date on monolayer semiconductors.

To demonstrate the potential of their op-amp, the researchers used it to fabricate a number of typical feedback circuits, including an inverting amplifier, an integrator, a logarithmic amplifier, and a transimpedance amplifier.

Although the op amp is still at the prototype stage and will continue to improve, the analysis carried out indicates the possibility of its production on an industrial scale.

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