Multiplexer design for the BASS Rake acoustic transducer array

The BASS Rake is an acoustic current meter designed to measure velocity profiles through the continental shelf wave bottom boundary layer. The instrument uses BASS electronics with a new transducer geometry to resolve the primary spatial and temporal flow scales of the wave boundary layer. The necessary characteristics of an interface satisfying the requirements of both the BASS transmit/receive circuit and the BASS Rake sensor design are extremely low through resistance, O(1 /spl Omega/), rapid switching, O(10 /spl mu/s), flexible cross connection of the transducers, and strong isolation between channels, >40 dB. The layered multiplexer described is designed to meet these requirements.