THS3491IDDAT

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The THS3491IDDAT is a high voltage amplifier from Texas Instruments’ high speed series that offers reliable, low noise and low power performance. Essentially a three-stage amplifier, it is designed for use with high-impedance bipolar or JFET input signals that require precision amplification, either directly or as part of a cascaded amplifier system.

It is versatile enough to handle a variety of applications, but the most common applications are measurement and instrumentation, waveform generation, and output amplification.

Application Fields

The THS3491IDDAT is perfect for use in instrumentation, waveform generation and output amplification applications mainly due to its low power consumption and low noise performance, which makes it well-suited for applications with limited power supplies, small form factors and tight noise specifications.

The THS3491IDDAT is used for audio, radar and sensor applications, where it amplifies signals from electro-mechanical, ultrasonic, and optical sensors. The amplifier is suitable for use in medical and industrial instrumentation, such as force transducers, pressure transducers, electromyographs, accelerometers and flow meters.

In addition, the THS3491IDDAT is used in RF and video signal processing, where it amplifies low-level signals from radio-frequency systems, such as GPS receivers and transmitters. It is also suitable for amplifying signals from video systems, including TV broadcasting and DVD playback.

Working Principle

The THS3491IDDAT works on a three-stage principle. The first stage is an input signal amplifier, which consists of a differential amplifier inherently compensated by its input signal pair, with frequency compensation achieved by a series of resistors and capacitors.

The second stage is an output amplifier, which consists of a differential amplifier again inherently compensated. It is capable of producing high power output and can drive heavy capacitive load compared to the first stage.

The third stage breaks the output node from the second stage to form a unity gain differentiator. It provides a high-frequency rolloff and allows for the synthesis of variable gain functions up to 80MHz.

In essence, the THS3491IDDAT is a current-feedback operational amplifier, which means that it has a gain and bandwidth product independent of the feedback network. This ensures the device can provide stable performance in a wide range of applications, even with heavy capacitive loading.

Overall, the THS3491IDDAT is a versatile, low-power and low-noise amplifier that offers reliable performance for a wide range of instrumentation, waveform generation and output amplification applications.

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