A NEW METHOD AIMED AT REDUCING HARMONIC DISTORTION IN ACTIVE-LOADED BJT AMPLIFIERS

In this paper, a new method is proposed which renders possible shiftin g of the optimum operating point for total harmonic distortion to any desired point on the de transfer characteristic of active-loaded bipol ar junction transistor amplifiers, by incorporating an additional curr ent source into the circuit to obtain different de current levels in d river and load transistors. A new analytical expression is derived to calculate the amount of additional current. Furthermore, two new circu it topologies are introduced for harmonic distortion reduction, which will be used according to the now direction of the additional current.