Level Shifter Op Amp Circuit

A level shifter is a circuit that converts a signal from one voltage level to another. This is often necessary when connecting devices with different logic levels, such as a 5V device to a 3.3V device. Level shifters can be implemented using a variety of different circuit configurations, but the most common type uses an operational amplifier (op amp). The basic level shifter circuit consists of an op amp, a resistor, and a capacitor. The op amp is configured as a non-inverting amplifier, with the input signal applied to the non-inverting input and the output taken from the inverting input. The resistor and capacitor form a high-pass filter, which prevents the output from being affected by any DC offset on the input signal. The following equation can be used to calculate the output voltage of the level shifter circuit: ``` Vout = (1 + R2/R1) * Vin ``` where: * Vout is the output voltage * Vin is the input voltage * R1 is the resistor connected to the non-inverting input * R2 is the resistor connected to the inverting input The output voltage of the level shifter circuit can be adjusted by changing the values of R1 and R2. To shift the output voltage up by a certain amount, increase the value of R2. To shift the output voltage down by a certain amount, decrease the value of R2. The following table shows the output voltage of the level shifter circuit for different values of R1 and R2: | R1 (Ω) | R2 (Ω) | Vout (V) | |---|---|---| | 100 | 100 | 5.0 | | 100 | 200 | 3.3 | | 100 | 300 | 2.5 | | 100 | 400 | 2.0 | Level shifters are a versatile and easy-to-use circuit that can be used to connect devices with different logic levels. They are commonly used in a variety of applications, such as interfacing between a microcontroller and a sensor, or between a microcontroller and a display. ### Applications of Level Shifters Level shifters are used in a variety of applications, including: * Interfacing between a microcontroller and a sensor * Interfacing between a microcontroller and a display * Interfacing between a microcontroller and a motor driver * Interfacing between a microcontroller and a relay * Interfacing between a microcontroller and a network interface Level shifters are also used in a variety of industrial applications, such as: * Power conversion * Signal conditioning * Data acquisition * Process control ### Conclusion Level shifters are a valuable tool for interfacing between devices with different logic levels. They are easy to use and can be implemented in a variety of different circuit configurations. Level shifters are used in a wide variety of applications, including embedded systems, industrial control, and power conversion.

Logic Level Shifting Basics Digikey