4-way Combiner is also known as sampling resistor, current sensing resistor, sampling resistor, and current sensing resistor. The main function is often used in feedback circuits. In the case of a regulated power supply circuit, in order to keep the output voltage constant, a portion of the voltage is extracted from the output voltage as a reference (usually in the form of a sampling resistor). When the output level is high, the input will automatically reduce the voltage. When the output decreases, the input will automatically increase the voltage and the test output will increase. Therefore, it is also known by engineers as a 4-way Combiner or sampling resistor.

In order to evaluate and analyze system current and power information up to tens of volts and 100 amps, shunt resistance is usually the first choice for current measurement. The method has small physical size, high precision and good temperature characteristics. There are various ways to measure and convert the signal generated on the shunt resistor. The most common method is to convert the differential signal of the 4-way Combiner into a single-ended signal using an analog front end. The single-ended signal is then connected to an analog to digital converter connected to the microcontroller.

The small input range optimized for TPA626 allows the device to take measurements directly on current-sensing resistors. The TPA626's built-in 16-bit ADC has low noise, so there is no need to amplify the input signal to increase the ADC's full-scale input range and avoid more error sources. The ADC architecture is specifically optimized to combine low input noise with fast sampling speeds. The minimum resolution voltage capability of TPA626 is more than 30 times higher than that of a typical 16-bit ADC.

4-way Combiner https://www.cenrf.com/5G-4Ways-Combiner-698-960-1710-2170-2300-2690-3300-3800MHz-43F.html