Feedback arrangement

A feedback arrangement for correcting distortion in an amplifier system, the distortion resulting from nonlinearities in the amplifier system and a load connected thereto, said feedback arrangement comprising:

• a differential amplifier having positive and negative input terminals and having first and second complementary output terminals;
• a first power output transistor having a base, an emitter and a collector, the base of said first power output transistor being connected to the first complementary output terminal of said differential amplifier;
• a first resistor having one end coupled to the collector of said first power output transistor and the other end connected to a positive terminal of a voltage supply;
• a second power output transistor having a base, an emitter and a collector, the base of said first power output transistor being connected to the second complementary output of said differential amplifier;
• a second resistor having one end coupled to the collector of said second power output transistor and the other end connected to a negative terminal of the voltage supply;
• an inductive load having one end connected to both emitters of said first and second power output transistors, and having the other end connected to a ground return terminal of the voltage supply;
• a first capacitor having one end connected to the junction between the collector of said first power output transistor and said first resistor;
• an error-sensing resistor having one end connected to the other end of said first capacitor and having the other end connected to the ground return terminal of the voltage supply;
• and
• a second capacitor having one end connected to the junction between the collector of said second power output transistor and said second resistor and having the other end connected to the positive terminal of said differential amplifier and to the junction between said first capacitor and said error-sensing resistor;
• the value of said error-sensing resistor being chosen such that the voltage across said error-sensing resistor substantially equals a voltage applied to the negative terminal of said amplifier;
• whereby the input signal applied to the negative terminal of said differential amplifier provides 100 percent feedback to the positive terminal of said differential amplifier resulting in an error correction feedback signal which corrects for distortion introduced by said amplifier system and said load when processed by said amplifier system.