A universal electrostatic protection circuit for the input end of a bipolar rail-to-rail op amp
An input terminal, rail-to-rail technology, applied in emergency protection circuit devices, emergency protection circuit devices, circuit devices, etc. for limiting overcurrent/overvoltage, to achieve the effect of strong flexibility and versatility
Active Publication Date: 2022-05-31
XIAN MICROELECTRONICS TECH INST
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Problems solved by technology
[0006] The purpose of the present invention is to provide a bipolar rail-to-rail op amp input terminal universal electrostatic protection circuit, overcome the above-mentioned defects in the antistatic structure of the rail-to-rail operational amplifier circuit of the prior art, and solve the problem that the traditional antistatic structure separates the input terminal voltage from the Positive and negative power supply voltage clamps the problem of the conduction voltage drop of the diode, and realizes the anti-phase reversal function required by most rail-to-rail op amps under the condition of satisfying the antistatic ability
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[0021] The present invention will be further described in detail below in conjunction with specific embodiments, which are to explain rather than limit the present invention.
[0022] A preferred embodiment of a general electrostatic protection circuit at the input end of a bipolar rail-to-rail operational amplifier of the present invention is as follows: figure 2 shown. A circuit structure with electrostatic protection function is added between the input port of the rail-to-rail op amp and the positive and negative power supplies. Special application requirements for input ports of rail-type op amps.
[0023] see figure 2 , The electrostatic protection circuit structure between the external input terminal PAD of the op amp and the negative power supply is composed of diodes D1, D2 and resistor R1, and the electrostatic protection circuit structure between the internal input terminal VIN of the op amp and the positive power supply is composed of diode D3. PAD is the exter...
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Abstract
The present invention provides a bipolar rail-to-rail op amp input terminal universal electrostatic protection circuit, including a diode D1, a diode D2 and a diode D3; the anode of the diode D1 is connected to the external input terminal PAD of the op amp, and the cathode of the diode D1 is connected to the cathode of the diode D2 The anode of the diode D2 is connected to the negative power supply VS‑; the anode of the diode D3 is connected to the internal input terminal VIN of the operational amplifier, and the cathode is connected to the positive power supply VS+. The invention realizes the anti-phase reversal function required by most rail-to-rail operational amplifiers under the condition of satisfying the antistatic ability, and solves the problem that the traditional antistatic structure clamps the input terminal voltage and the positive and negative power supply voltages to the conduction voltage drop of the diode.
Description
technical field [0001] The invention relates to the technical field of integrated circuit design, in particular to a general electrostatic protection circuit with strong anti-static capability facing the input stage of a bipolar rail-to-rail operational amplifier. Background technique [0002] Rail-to-rail operational amplifiers play an important role in the field of operational amplifiers because they increase the dynamic range of the amplifier and maximize the overall performance of the amplifier. Rail-to-rail op amps are a special type of op amp that require a common-mode input voltage range and output voltage swing that can range from a positive supply voltage to a negative supply voltage without the op amp flipping like a conventional op amp. In addition, many rail-to-rail op amps even require that the input voltage be higher than the positive supply voltage or lower than the negative supply voltage and still be resistant to phase inversion. For example, AD company's r...
Claims
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IPC IPC(8): H02H9/04H02H9/02
CPCH02H9/04H02H9/02
Inventor 肖筱党秋实尤路魏海龙支知渊
Owner XIAN MICROELECTRONICS TECH INST