 Hello and welcome to this video, where I will show you comparison between standard operational amplifiers like LV series and ST zero drift TZ amplifiers in current sensing application. Many applications require some kind of current sensing. Most of them uses shunt resistors as shown in the animation. The issue with shunts is that they produce heat and might be quite big, especially when standard amplifier is used. A very simple way how to get rid of bulky and expensive shunts is to use high precision opamp. This will rapidly reduce amount of the energy dissipated on the shunt and therefore it will reduce its size and cost. The TZ opamps based on zero drift technology can help you to do so. Let's see how it works. The basic idea of zero drift technology, also called chopper architecture, is the continuous swapping of amplifier inputs to remove all imperfections. In the first period, the input signal together with the input offset voltage is amplified in a normal way. In the second cycle, the switches change the signal path. The input signal is then amplified in the same way, but the input offset voltage is amplified in the opposite. This will cause the input offset voltage to appear in higher frequencies, where it can be filtered out by low pass filter. This approach will virtually remove not only the input offset voltage, but also all other DC or low frequency imperfections like temperature drift and one by F noise. Increased precision is the main benefit of this technology. It can be more than 1000 times more precise than standard amplifiers with input offset voltage going from millivolts down to microvolts. Moreover, it keeps its parameters over the temperature range as well as over its full lifetime. The stability over temperature is the main advantage we would like to show in this video. We prepared a demonstration board with two similar setups with different operation amplifiers. The first setup is assembled with LMV321 and the second one hosts TZ121. Both measure the same current using a shunt resistor. In the first case it is 100 mA, while in the second case it is only 1 mA. The readings are shown on the LED displays. The board embeds heat resistors beneath every amplifier input, so we can observe the behavior at the different temperatures. The complete demonstration is controlled by an STM32 nuclear. Both setups were designed to have similar accuracy. Therefore, the shunt resistor for the LMV device has much higher value and heats much more. It can be clearly seen on thermal image. The setup with TZ uses smaller shunt, which brings much smaller dissipation. Now we start to heat up a LMV device. When the temperature is rising, the input offset voltage drifts and as you can see the reading drifts as well. The behavior is different in the case of TZ family amplifier. The temperature rises, but the readings remain the same. For more information about ST operation amplifiers visit st.com.