LIA135

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The LIA 135 application field and its working principle are two central concepts for anyone wishing to understand the operation of this type of linear amplifier. LIA 135 (Linear Instrumentation Amplifier) was designed by Analog Devices to provide a wide range of gain and flexibility. This article will take a close look at the application field and working principle of the LIA 135.First and foremost, the LIA 135 is designed for evaluating signals in the frequency range of DC to 500MHz. It has a wide range of gain options, ranging from unity (1) to differential gains of +100,000. The amplifier’s large input and output impedances are ideal for working with various current and voltage sources. The LIA 135 can also be used with MATLAB or other engineering programs, allowing for further customization of the amplifier.The LIA 135 also features two independent differential inputs and a single-ended output in order to perform a variety of noise-cancelling duties. The inputs are buffered with an on-chip operational amplifier (OP amp) to improve accuracy, and the input-referred noise is exceptionally low. These characteristics make the LIA 135 a perfect fit for applications such as medical instrumentation, industrial sensors and microphones, and any other high precision, low-noise application.

The LIA 135 utilizes a two stage, unconditional unity-gain, differential amplifier topology. In the first stage, two differential pairs are used to provide an unconditional gain of one, resulting in a large common-mode input range. This design feature prevents signals outside of the common-mode range from being amplified and creates a distortion-free audio output.Next, the output of the differential amplifier is sent to an operational amplifier (OP amp). This OP amp is configured as a voltage follower, providing the user with the ability to adjust the output gain of the LIA 135. This gain can be set to a range of unity to +100,000, depending on the application. Additionally, the OP amp’s bandwidth is limited to 1.2 MHz, eliminating higher-frequency noise components from the amplifier\'s output.

The LIA 135 can also be configured as a single-ended amplifier, eliminating the need for a differential input. In this configuration, the LIA 135 operates as a single-ended-output instrumentation amplifier. This type of amplifier has a high input impedance and a low output impedance for superior current transfer and improved fidelity. The single-ended amplifier design allows for better stability, increased noise rejection, and improved common-mode rejection compared to conventional instrumentation amplifiers.

The LIA 135 is an incredibly versatile linear amplifier. Its wide range of gain, low-noise input, and single-ended output make it a perfect choice for situations where accuracy, stability, and noise rejection are essential. Its unconditional gain of one and its adjustable gain options give it the flexibility to be used in a wide variety of applications. From medical instrumentation to industrial sensors and microphones, the LIA 135 can be used to improve the overall performance of a system.

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