Instrumentation Amplifier (IN-AMP) is a specially designed differential input amplifier mainly used for accurate, low noise differential voltage amplification. Instrumentation amplifiers are characterized by their high gain, low noise, high linearity, impedance matching and temperature stability, which make them widely used in various circuits. The performance, reliability and accuracy of a circuit system can be improved by the proper selection and application of instrumentation amplifiers. The following is a detailed analysis of the instrumentation amplifier:

I. Definition and Basic Principle

Instrumentation amplifier is a kind of electronic equipment used for measuring small signal amplification, which amplifies the input signal through operational amplifier or differential amplifier and outputs a processed signal to meet different application requirements. The basic principle lies in the use of differential amplifiers as input levels to enhance the common mode rejection capability of the amplifier and improve the accuracy and stability of the instrument.

II. Features and Advantages

High gain: The instrumentation amplifier has an adjustable high gain, which can amplify weak signals to a range suitable for subsequent processing and improve the sensitivity of the signal.

Low noise: through noise filtering and signal-to-noise ratio optimization technology, the instrumentation amplifier effectively reduces the impact of noise on signal measurement, providing clear and accurate signal amplification and processing.

High Linearity: Good linearity maintains the linear relationship between input and output, avoiding non-linear distortion and meeting the needs of applications requiring high accuracy.

Impedance matching: with input and output impedance matching characteristics, effectively avoid signal loss and interference, improve the efficiency and stability of signal transmission.

Temperature stability: The design takes into account the influence of temperature and adopts stable circuits and materials to ensure stable and reliable operation at different temperatures.

Three, application areas

Instrumentation amplifiers are widely used in various circuits, including but not limited to the following areas:

Sensor signal amplification: commonly used to amplify the weak signals output from sensors (e.g. pressure sensors, temperature sensors, light sensors, etc.) to improve the accuracy and sensitivity of the measurement.

Instrumentation: in oscilloscopes, spectrum analyzers, signal generators and other equipment for signal amplification, noise filtering and linearization.

Control systems: in automation control, robot control and industrial process control, etc., for processing sensor signals and providing stable and reliable feedback signals.

Medical equipment: Used to amplify bioelectric signals (e.g. ECG, EEG, EMG, etc.) to provide accurate signal amplification and processing for medical diagnosis, monitoring and treatment.

Communication system: used for signal amplification and processing in communication system to ensure stable transmission and reliable reception of signals.

IV. Famous Brands and Products

CASI Semiconductor distributes several well-known brands to provide instrumentation amplifier products, including but not limited to:

Texas Instruments (TI): Provides a wide range of instrumentation amplifiers to meet diverse engineering needs.

Analog Devices (ADI): Its instrumentation amplifiers are widely recognized for providing instrumentation amplifiers, especially in high-precision and low-noise applications.

Maxim Integrated (now part of ADI): offers a range of instrumentation amplifiers, some designed for medical and industrial applications.

Linear Technology (now part of ADI): offers high-performance instrumentation amplifiers that excel particularly in low noise and high precision applications.

Microchip Technology: Provides instrumentation amplifiers for a wide range of applications, from industrial to medical.

STMicroelectronics: offers instrumentation amplifiers for a variety of industrial and automotive applications.

ON Semiconductor: Instrumentation amplifiers are typically focused on industrial applications and motor control.

Each of these brands has its own distinctive features, allowing users to choose the right instrumentation amplifier for their specific application needs.

Original stock is always available:

（ADI / Maxim）

AD623ARZ-R7 MAX4194ESA+T AD8231ACPZ-R7 MAX4208AUA+T AD627ARZ-R7 MAX4230AUK+T AD8253ARMZ-R7 MAX4462HETT+T AD8226ARZ-R7 MAX4462HESA+T AD620ARZ-REEL7 MAX4462HEUT AD8221ARMZ-R7 MAX4195ESA+ AD8421ARZ-R7 MAX4462TETT+T AD8226ARMZ-R7 MAX4460ESA+T AD623ARZ MAX4462HESA+ AD620ARZ MAX4194ESA+ AD8223ARZ-R7 MAX4209HAUA+ AD8421BRZ-R7 MAX4462HEUT+T AD620ANZ MAX4460EUT+T AD8253ARMZ MAX4461UEUT+T AD8237ARMZ-R7 MAX423CPD AD8421BRMZ MAX423EPD AD8421ARZ MAX4462TEUT+T AD8420ARMZ-R7 MAX41400ANL+ AD8422BRZ MAX4461TETT+T AD8237ARMZ MAX4196ESA+ AD8226ARMZ MAX4460ESA+ AD8223ARMZ-R7 MAX4461HETT+T AD8221ARMZ MAX4196ESA+T AD8420ARMZ MAX4461UESA+ AD620ARZ-REEL MAX4460ETT+T AD8250ARMZ-R7 MAX4197ESA+T AD620BRZ-R7 MAX5426CEUD+ AD8221BRZ MAX4462TEUT AD8221ARZ-R7 MAX4461TEUT ……

(TI)

INA128UA/2K5 INA128UA INA826AIDR INA849DGKR INA333AIDGKR PGA855RGTR INA828IDR INA155EA/2K5 INA826AIDRGR INA2331AIPWR INA129UA INA188IDRJR INA129U INA163UA/2K5 INA826AIDGKR INA333QDGKRQ1 INA821IDR INA188IDR INA118U/2K5 INA327EA/2K5 INA128U/2K5 INA823DGKR INA126UA/2K5 INA826SIDRCT INA331AIDGKR INA141UAE4 INA818IDR INA155E/250 INA821IDGKR INA126E/250 INA129UA/2K5 INA125U/2K5 INA333AIDRGR INA326EA/250 INA823DR INA337AIDGKT INA217AIDWR INA2126E/250 INA326EA/2K5 INA2126U INA350ABSIDDFR INA821IDRGR INA823DGKT INA125UA/2K5 INA118UB/2K5 INA155UA/2K5 INA350CDSIDDFR INA2321EA/250 INA129U/2K5 INA2126E/2K5 INA827AIDGKR INA337AIDGKR INA332AIDGKR INA114BU INA350ABSIDSGR INA826SIDRCR INA114AU/1K INA126EA/250 INA331AIDGKT INA125UA ……

（Microchip）

MCP6N11-010E/SN MCP6N16T-001E/MF MCP6N16-100E/MS MCP6N11T-001E/MNY MCP6N11-002E/SN MCP6N11T-005E/SN MCP6N11-001E/SN MCP6N11T-002E/MNY MCP6N11T-010E/MNY

MCP6N11T-100E/SN MCP6N16-100E/MF MCP6N16T-100E/MF MCP6N11-100E/SN MCP6N16-001E/MS MCP6N16T-010E/MF MCP6N16-010E/MS MCP6N16-001E/MF MCP6N11T-010E/SN MCP6N16T-001E/MS MCP6N11T-001E/SN MCP6N16T-100E/MS MCP6N11T-005E/MNY MCP6N11T-002E/SN

MCP6N16T-010E/MS MCP6N16-010E/MF MCP6N11-005E/SN

( onsemi)

SC324ADR2G SC324DR2G SC33262DR2G SC2901VDR2G SC2901DR2G SC2901DTBR2G SC2902VDR2G SC2901VDTBR2G SC2902VDTBR2G SC224DTBR2G