AD8659ARZ

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Introduction

The AD8659ARZ is a low cost, high linearity amplifier developed by Analog Devices. It is designed to be used in various applications and can be used to drive a variety of loads. This application field and working principle guide seeks to provide the reader with an understanding of the tools available for their specific application and what the underlying principles are that make these tools work.

Instrumentation, OP Amps, and Buffer Amplifiers

The AD8659ARZ is most commonly used as an instrumentation amplifier, operational amplifier (op amp), or buffer amplifier. All three of these types of amplifiers use transistors to amplify or buffer a signal or voltage. An instrumentation amplifier operates differently than an op amp and buffer amplifier, in that it uses two differential amplifiers in order to gain differential signals while rejecting common mode signals. The two differential amplifiers can be individually controlled and buffered, allowing for gain to be adjusted dynamically. An op amp has two inputs and one output, and uses sets of transistors to increase or decrease the output voltage depending on the input. Op Amps are considered high gain, high magnification devices and have very low output offsets. A buffer amplifier is designed to take a signal from one power source and transmit it to another source, or to drive loads which require more power than the source can provide. The buffer amplifiers also provide a low output impedance to ensure proper operation regardless of the input voltage.

AD8659ARZ Working Principle

The AD8659ARZ works by combining transistors and resistors to amplify or buffer the desired signals. The resistance provides the gain needed to get the desired output voltage, and the transistors are used to switch the current paths in order to get the desired voltage. The transistors are arranged to form a gain stage, which will amplify the signal and allows the user to adjust the gain dynamically. The resistors are arranged to provide buffering, as well as provide the necessary current to drive the loads. The current is then outputted through the collector or emitter of the transistor depending on the biasing used.

The AD8659ARZ also uses a slew rate control and a common mode feedback to regulate the output voltage and prevent cross-talk and distortion. The slew rate control prevents the amplifier from going into gain compression, which will cause the output voltage to rise quickly. The slew rate control can be adjusted to provide a desired group of pulses or pulses of a specific frequency. The common mode feedback can be adjusted to maintain the desired output voltage, and also provides additional protection against distortion and cross-talk.

Conclusion

The AD8659ARZ is a low cost, high linearity amplifier that is designed to be used in various applications. It is most commonly used as an instrumentation amplifier, op amp, or buffer amplifier, and works by combining transistors and resistors to amplify or buffer the desired signal. The AD8659ARZ also uses a slew rate control and a common mode feedback to regulate the output voltage and prevent cross-talk and distortion. With its low cost and high linearity, the AD8659ARZ is a great choice for applications that require signal amplification or buffering.

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