What does a current sense amplifier do?
What does a current sense amplifier do?
A current sense amplifier is a special purpose integrated circuit differential amplifier that is designed to sense the voltage developed across a current shunt and output a voltage proportional to the measured current.
What is a shunt amplifier?
Current sense amplifiers (also called current shunt amplifiers) are special-purpose amplifiers that output a voltage proportional to the current flowing in a power rail. These amplifiers use specialized ESD structures that enable them to have this functionality.
What’s the difference between high side and low side current sensing?
The difference is based off on the location of the sense resistor. Low side sensing is between load and ground, with high side sensing between power and the load. A high side current sensor, with a precision trimmed preset gain of either 20, 50, or 100.
What is sense amplifier in SRAM?
Sense Amplifier. The sense amplifier is in charge of detecting what value is stored in an SRAM cell during a read cycle and displaying that value at the output. Since only one row of data is accessed during each read cycle, each column of cells within the SRAM array requires only one sense amplifier [3].
What is a current sense resistor?
A current sensing resistor is designed for low resistance so as to minimize power consumption. As a result, the calibrated resistance senses the current flowing through it in the form of a voltage drop which is detected and monitored by the control circuitry.
What is sense amplifier in DRAM?
A sense amplifier is part of the read circuitry that is used when data is read from the memory; its role is to sense the low power signals from a bitline that represents a data bit (1 or 0) stored in a memory cell, and amplify the small voltage swing to recognizable logic levels so the data can be interpreted properly …
How do we sense current?
The most common way to measure current is to sense the voltage drop across a shunt or current-sense resistor. To achieve a highly accurate measurement of the current, you’ll need to examine the parametric values of both the resistor and current-sense amplifier.
What is high-side current?
1. High-side and low-side current sensing refers to the placement of the current-sense resistor: between the positive supply and the load, or between the load and ground.
Can differential overvoltage damage a current sense amplifier?
This differential overvoltage can cause damage to the amplifier, especially if there is no protection circuit present. Figure 1. High-side current sensing in a solenoid control application. Figure 2 shows the basic connection for overvoltage protection of a current sense amplifier.
What is a current sense amplifier?
Current sense amplifiers integrate the amplifier along with all the gain-setting resistors which enables small and unified temperature drift. This allows for robust current measurements across the whole specified temperature range. The achieved temperature stability is one of the key advantages current sense amplifiers have over
Can current sense amplifiers handle high CMV voltages?
Most current sense amplifiers are capable of handling high common-mode voltages (CMVs) but not high differential input voltages. In certain applications, there are instances where the differential input voltage at the shunt exceeds the specified maximum voltage of the amplifier.
What is the advantage of using two sense amplifiers?
Using two sense amplifiers a wide current range can be broken up into a high and low range for better accuracy at lower currents. Two different value sense resistors can be used in series with each monitored by one side of the LTC6103.
