THS3115CPWP

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THS3115CPWP Application Field and Working Principle

The THS3115CPWP is an ultralow power, ultralow-noise, rail-to-rail output amplifier, typically used in the fields of linear amplifiers, instrumentation, OP-amps, buffers and microcontrollers. It is usually powered by a single supply voltage and employs a class AB output stage. The unit provides a high gain range, low input bias current and low power consumption.

The circuit of the THS3115CPWP requires three amplifier stages and a unity gain output driver. The amplifiers are powered by a single supply voltage (usually 3 V to 19 V), with a maximum output swing from 0 V to the supply voltage. An input amplifier stage is usually implemented in bipolar technology, and the output and unity-gain stages are implemented with CMOS structures.

The first stage of the amplifier is an input stage that consists of an input device N1 and an output device N2, along with a current source I1. This stage is responsible for providing differential gain and is also responsible for preventing input bias current and latch-up. The second stage of the amplifier is the output stage, which is responsible for providing the output current drive. This stage consists of two transistors N3 and N4, along with a current source I2 and a current mirror M1. Finally, the third stage is the unity-gain output stage, which consists of a single transistor N5 and a current source I3.

The majority of the gain in this amplifier is obtained through the second and third (output) stages. The input stage provides a differential gain and provides a virtual ground at the input of the second stage. The input stage provides a negative feedback mechanism, which reduces output parasitic effects such as offset and phase distortion. The unity-gain output stage essentially acts as a buffer, taking the output signal and providing high current drive, while maintaining a constant output impedance.

The THS3115CPWP is a low-noise and low-power amplifier, ideal for linear and instrumentation applications. It is capable of relatively large gains, has a rail-to-rail output swing, and a wide operating voltage range. Due to its low-noise and low-power operating characteristics, it can be used with high-impedance sensors, thereby reducing system power consumption. The low-noise and low-power characteristics also make it suitable for use in battery-powered applications.

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