A High Performance, High Efficiency Audio Subsystem for Car Ratio

An electronic module designed for locally powered loudspeakers in OEM autosound applications has evolved from a circuit that employed small scale off-the-shelf ICs and many discrete components, ttough a revision utilizing semi-custom ICs and fewer discretes, to an advanced realization that capitalizes on the benefits of full custom integration. This paper first considers the unique requirements placed on high fidelity music systems by automotive application, and describes a particular system solution that specifies a compact electronic circuit. Implementation of the circuit functions with the full custom ICs is then discussed, followed by a presentation of the measured performance of the circuit.