Gain amplifying circuit diagram or programming
The PGA103 operational amplifier is specifically engineered to accommodate a broad spectrum of input voltages, making it suitable for various applications where high voltage signals need to be processed. The implementation of a voltage divider using an 11.3kΩ resistor in conjunction with a 102kΩ resistor allows for precise scaling down of high input voltages. This configuration ensures that when subjected to a high input voltage, such as 120V, the resultant voltage presented to the PGA103 is safely reduced to 12V, thereby preventing damage to the amplifier and ensuring proper operation.
The choice of diodes D1 and D2, specifically the 1N4148 model, is critical for protecting the PGA103 from voltage spikes and reverse polarity conditions. These diodes are configured in a bidirectional arrangement to clamp the input voltage effectively, ensuring that the operational amplifier receives a maximum input voltage of 15V and a minimum of -0.7V. This clamping mechanism is essential for safeguarding the integrity of the PGA103's internal circuitry and maintaining its performance characteristics over varying input conditions.
Overall, the combination of the voltage divider and the clamping diodes plays a pivotal role in the reliable operation of the PGA103 in high-voltage environments, making this circuit design a robust solution for interfacing with high-voltage signals. As shown in FIG PGA103 constituted by a wide input voltage range of the amplifier. 11.3k with 102k resistor voltage divider circuit dividing ratio of about 1/10, such as when t he input voltage is 120V, after dividing the input voltage applied PGA103 only 12V, wide input voltage can be. At the same time, the diode D1, D2 (take 1N4148) play a two-way clamping action, PGA103 input voltage of 15 ~ disabilities 0.7V.
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