That is, injecting a current causes it to flow in related circuitry and causes a voltage change, and adjusting voltage causes current flows to alter. This injects a small current into the node which causes an offset voltage.Ĭurrent injection effectively occurs at a high impedance point and voltage adjustment at a low impedance point, but both methods are functionally equivalent. Or a say 100 kohm resistor from the op-amp inverting input can be fed by a 10 kohm potentiometer connected to +/- 15 V. The ease of use of this method is improved by adding one two-resistor divider to the potentiometer voltage, as explained below. The methods described below can easily be applied to your circuit byĪdding a divider and potentiometer at the ground end of your R2. Or vary the voltage of a node which a circuit element connects to. The best method to use varies with the application circuit, but all eitherĪpply a variable current to a circuit node There are a range of methods which can be used to provide offset voltage compensation.
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