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Apparatus and methods for amplifier input protection

A technology for amplifiers and protection circuits, which is applied in the field of input protection circuits and can solve problems such as electromigration damage and amplifier damage

Active Publication Date: 2015-11-11
ANALOG DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If protection is lacking, large input signals can lead to overvoltage conditions and / or high levels of power dissipation, which can lead to damage to the amplifier, such as damage to semiconductor junctions in metal lines and / or electromigration

Method used

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  • Apparatus and methods for amplifier input protection
  • Apparatus and methods for amplifier input protection
  • Apparatus and methods for amplifier input protection

Examples

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Embodiment Construction

[0014] The following detailed description of certain embodiments presents various descriptions of specific embodiments of the invention. However, the invention can be embodied in many different ways, for example as defined and covered by the claims. In this specification, reference is made to the drawings, wherein like reference numerals may indicate identical or functionally similar elements.

[0015] Figure 1A An example of amplifier 10 is shown. Figure 1B shown connected in the configuration of the buffer 20 in the Figure 1A amplifier 10.

[0016] The amplifier 10 includes a first or non-inverting input voltage terminal VIP, a second or inverting input voltage terminal VIN, an output voltage terminal VOUT, an amplifier circuit 1 , and an input protection circuit 2 . The amplification circuit 1 comprises a first or non-inverting input, a second or inverting input and an output. The input protection circuit 2 includes a first input protection member 3 a , a second input...

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PUM

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Abstract

Apparatus and methods for amplifier input protection are provided. In certain implementations, an amplifier input protection circuit includes a first JFET electrically connected between a first input and a first output, and a second JFET electrically connected between a second input and a second output. Additionally, a first clamp is electrically connected to the first output, and a second clamp is electrically connected to the second output. A first current mirror mirrors a current through the first clamp, and provides the mirrored current to a third JFET electrically connected between the first JFET's source and gate. Additionally, a second current mirror that mirrors a current through the second clamp, and provides the mirrored current to a fourth JFET that is electrically connected between a source and gate of the second JFET. Configuring the protection circuit in this manner can provide the benefits of both low noise and low fault current.

Description

technical field [0001] Embodiments of the present invention relate to electronic systems, and more particularly to input protection circuits for amplifiers. Background technique [0002] Amplifiers, such as operational amplifiers or instrumentation amplifiers, may include input protection circuitry to protect the amplifier from large input signals. Without protection, large input signals can lead to overvoltage conditions and / or high levels of power dissipation, which can lead to damage to the amplifier, such as damage to semiconductor junctions in metal lines and / or electromigration. [0003] When the input voltage signal is within a safe voltage range, the input protection circuit can be used to provide the input signal to the amplifying circuit of the amplifier, so that the amplifier can amplify the input signal. For example, in one example, the input protection circuit may provide an input signal to the amplifier circuit when the voltage level of the amplifier input is ...

Claims

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Application Information

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IPC IPC(8): H03F1/52
CPCH03F1/523H03F3/16H03F2200/441H03F2200/471H03F3/45475H03F2203/45552
Inventor M·格斯滕哈伯R·詹森
Owner ANALOG DEVICES INC
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