A digitally controlled 8-input/2-output audio mixer IC

Author

Thomson, David ; Miranda, Evaldo M.

Author_Institution

Analog Devices Inc., Santa Clara, CA, USA

Volume

2

fYear

1995

fDate

13-16 Aug 1995

Firstpage

1193

Abstract

An integrated-circuit implementation of an eight channel audio mixer is presented. This architecture utilizes a novel cascaded R-xR ladder. The requirements for such an IC have emerged to satisfy a generic need for such a function, particularly in professional audio and multimedia systems. Specifically, the IC described is an 8×2 mixer-eight voltage inputs and two voltage outputs. Each input has an attenuation control with 1 dB steps up to 63 dB maximum attenuation and can be steered to either, both or neither (mute) left/right output mixers. Design considerations are presented for optimum Total Harmonic Distortion (THD) and the particular design achieves a THD of 0.01%. The chip has been implemented on an advanced BiCMOS process with complementary MOS, bipolar transistors and oxide capacitors in an area of less than 12.5 mm²

Keywords

BiCMOS integrated circuits; audio equipment; digital control; harmonic distortion; mixed analogue-digital integrated circuits; mixers (circuits); BiCMOS process; attenuation control; cascaded R-xR ladder; digitally controlled mixer IC; eight channel audio mixer; integrated-circuit implementation; optimum THD; total harmonic distortion; Attenuation; Attenuators; Bandwidth; Digital control; Digital integrated circuits; Impedance; Noise level; Resistors; Switches; Total harmonic distortion;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1995., Proceedings., Proceedings of the 38th Midwest Symposium on

Conference_Location

Rio de Janeiro

Print_ISBN

0-7803-2972-4

Type

conf

DOI

10.1109/MWSCAS.1995.510308

Filename

510308