Wide input voltage range amplifier composed of PGA103

As shown in the figure, it is a wide input voltage range amplifier composed of PGA103. 11.3kΩ and 102kΩ resistors form a voltage divider circuit, and the voltage divider ratio is about 1/10. For example, when the input voltage is 120V, the voltage added to the input terminal of PGA103 after voltage division is only 12V, so a wide voltage input is possible. At the same time, diodes D1 and D2 (1N4148) play a bidirectional clamping role, making the voltage input to PGA103 ±15~±0.7V.