Patent ID: 8604879

Claim:
A differential feedback amplifier comprising: a main differential amplifier having a main gain and having for each of a first and a second side of the main differential amplifier: [a] a main transistor having a main base coupled to an input and a main collector coupled to an output, [b] an input impedance matching a source impedance and an output impedance matching a load impedance, [c] a first negative feedback comprising a series-coupled resistor and capacitor coupled between the input and the output, [d] a second negative feedback comprising a main emitter degeneration component coupled between a main emitter and ground; and a compensation differential amplifier that generates and subtracts distortion from the main differential amplifier, the compensation differential amplifier having a compensation gain lower than the main gain and having for each of a first and a second side of the compensation differential amplifier: [e] a compensation transistor having a compensation base directly coupled to the main base and a compensation collector coupled to one of the main collector and the main emitter to subtract the distortion; [f] a third negative feedback comprising a compensation emitter degeneration component coupled between a compensation emitter and ground.