ISO120G-BI

ISO120G-BI Application Field and Working Principle

ISO120G-BI is an instrumentation amplifier typically used for tests and measurement or for providing low frequency gain in audio or communications applications. This device incorporates a 3-stage current feedback amplifier design that provides excellent distortion performance, wide bandwidth, low offset voltage and low input bias current. This amplifier is particularly well suited for applications with signals of low galvanic isolation, such as AC-coupled acoustic signals, balanced differentials, and frequency-based signals.

The ISO120G-BI instrumentation amplifier contains a single differential input stage, with two inverting operational amplifiers (op-amps) configured in a current-feedback amplifier. Each amplifier stage is a common-mode feedback amplifier, with a single differential pair of transistors, together with passive components to form a high-gain, low-noise input stage. The two stages form a low-threshold, high-gain differential amplifier. The output of the amplifier is then buffered by another differential op-amp, with an active gain-setting stage.

The ISO120G-BI instrumentation amplifier is designed with a gain-setting stage connected to a single resistor. The gain of the amplifier is determined by this resistor, as it sets the stage\'s feedback resistance. This gain-setting stage also provides a large, stable output offset voltage, thereby eliminating any need for an output-trimming stage. The ICO120G-BI also implements an active input protection circuit for overcurrent protection, as well as a high-side protection FET for reverse polarization protection.

The ISO120G-BI is a popular instrumentation amplifier due to its wide bandwidth, low offset voltage, low input bias current, relatively low noise, and excellent distortion performance. In addition, all of its components are integrated into a single package, making this amplifier ideal for applications where space and complexity are at a premium. The ISO120G-BI can be used in microphones, direct pickups, and even high-precision thermocouple applications.

Due to its low distortion and high CMRR, the ISO120G-BI can be used in a variety of analog signal acquisition and measurement applications. It is suitable for industrial or laboratory use, and can be found in data acquisition systems such as precision temperature monitoring and control systems. The ISO120G-BI is also used in medical imaging, such as EEG and EKG monitoring.

In summary, the ISO120G-BI instrumentation amplifier is a popular choice for a variety of tests and measurement or audio applications. It offers wide bandwidth, low distortion, low offset voltage and low input bias current, as well as a robust protection circuit for overcurrent and reverse polarization protection. It is integrated into a single package, and can be used in precision temperature monitoring and control systems, medical imaging, and various other analog signal acquisition and measurement applications.