How can we use op-amp as differential amplifier?
The Differential Amplifier circuit is a very useful op-amp circuit and by adding more resistors in parallel with the input resistors R1 and R3, the resultant circuit can be made to either “Add” or “Subtract” the voltages applied to their respective inputs.
What is differential gain in op-amp?
Differential-load voltage gain is the gain given to a voltage that appears between the two input terminals. It represents two different voltages on the inputs. Ideally, an op amp will reject voltages that appear on both input terminals, resulting in common-mode voltage gain of zero.
How is an op amp used for high side current sensing?
Using An Op Amp for High-Side Current Sensing Tim Claycomb, Marc Liu High-side current sensing is used in a wide range of applications such as battery chargers or overcurrent protection. Figure 1 displays a typical high-side current sensing schematic. The shunt resistor, Rshunt, is placed between the bus voltage and the system load creates
How is the gain of a differential amplifier varied?
Since the input voltage at the outputs of amplifiers A1 and A2 appears differentially across the three resistor network, the differential gain of the circuit can be varied by just changing the value of R1.
What kind of amplifier is used for current sensing?
This article introduces the four differential amplifiers that typically are used in direct current sensing solutions: operational amplifiers (op amps), difference amplifiers (DA), instrumentation amplifiers (IA), and current shunt monitors (CSM). The use of an op amp for current sensing is limited by input common-mode voltage.
Can a difference amplifier be used for low side sensing?
Difference amplifiers, however, can be used for high-side current sensing in the presence of high common-mode voltages at the expense of drawing current from the system bus supply. They can also be used for low-side sensing and negate the effects of parasitic resistances to ground.