Barney Oliver: Crossover Distortion in Class B Audio Amplifiers
This is the famous analysis of class B amplifier cross-over distortion by the then head of HP Reasearch Labs, Dr. Barney Oliver, published in the February 1971 edition of the HP Journal. The bias current Iq for a class B emitter follower amplifier is shown to be approximately Iq = .026/(Re+re+(rb/hFE)). In practice, – the […]
Peter Walker’s ‘Current Dumping’ Amplifier from 1975
Peter Walker – Founder of Quad The famous Quad ‘Current Dumping’ amplifier launched in the mid 1970’s, and featured feed forward error correction that effectively removed the class B cross over distortion that plagues this type of output circuit structure. The design featured no adjustments in production, but the circuit components around the output (L2, […]