Figure 1e shows a constant-current source. All of these circuits exhibit excellent ... you can optimize each circuit's dynamic impedance and current range through a judicious choice of op amps and ...

They pull a constant current regardless of the voltage of the supply. [George’s] version extends the range of the original a little bit by running the op-amp at 8 volts. He says that everything ...

We are all used to the op-amp, as a little black box from which we can derive an astonishingly useful range of circuit functions. But of course within it lurks a transistor circuit on a chip ...

The figure shows a simple, low-cost voltage-controlled current source using two op amps that provides a good ... so we have: If R is a constant value (low thermal coefficient), the output current ...

Practical differences exist between voltage and current-feedback op-amp topologies ... is multiplied by a dimensionless gain constant (A). In a VFB amp with negative feedback, the output changes ...

Figure 1 shows why in a simple op amp circuit. With a constant input voltage to the closed-loop circuit there is zero voltage between the op amp inputs. The input stage is balanced and the current IS1 ...