UC3176QPTR

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UC3176QPTR Application Field and Working Principle

UC3176QPTR is a linear amplifier for instrumentation, operational amplifiers (OP Amp) and buffer amplifiers application. It utilizes an advanced BiCMOS technology to obtain better linear and noise performance, lower power consumption and greater common-mode rejection ratio compared to other traditional OP Amp designs. This product is an ideal choice for amplifiers used in industrial, medical, automotive and instrumentation applications, because of the good common-mode rejection ratio and high bandwidth.

Application Field

UC3176QPTR is designed for applications requiring precision precision, such as:

• Analog/digital signal processing,
• Industrial control system,
• Medical equipment,
• Automotive electronic system,
• Instrumentation.

Working Principle

UC3176QPTR performs its job using two main components, an input differential pair and an output differential pair. The amplifier’s input stage is of the cascoded type, with very low input bias current and high CMRR. The output pair is of the source-follower type, with the gate voltage of the output FETs controlled by a third stage of a cascoded differential amplifier. The amplifier is designed with very low output impedance, low total harmonic distortion and excellent common-mode rejection ratio.

The input-pair is biased by a current-mirror, providing good linearity and low input-offset voltage. The gain of this stage is also well maintained by the fact that the current-mirror establishes a stable reference current, while the output-voltage-swing is maintained by the current-mirror at a temperature-stable selected value. Hence, the bandwidth of the amplifier is improved by increasing the current values in the two output stages.

The output stage of the amplifier is cross-coupled to support high current-mirror and to provide a very low output impedance which helps maintain the gain and performance even when driving high capacitive loads. The current mirrors are used to bias the output stages and establish a temperature independent output-voltage-swing. This design provides for very good output-swing characteristics and very good temperature stability.

Overall, the UC3176QPTR is an excellent choice for applications requiring precision amplifiers with improved linearity and low noise. It is designed to provide the best possible performance in demanding applications, providing a very low bandwidth and power consumption, high stability, excellent linearity and common-mode rejection ratio.

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