Analog electronic cochlea design using multiplexing switched-capacitor circuits

Abstract

A new design methodology is proposed to realize a real cochlea using the multiplexing switched-capacitor circuits. The proposed technique is based upon the transmission-line model proposed by Zwislocki (1950). At the cost of the increase in the number of clock phases, the decay rate in the transition region of the filter section can be increased by adding only a few components. Therefore, the components and chip area of the designed silicon cochlea can be small. An experimental chip containing four filter sections has been designed and fabricated. The measured frequency responses from the 32-section cochlea formed by cascading nine fabricated chips are consistent with both theoretical calculation results and observed behavior of a real cochlea. Moreover, the designed silicon cochlea has the dynamic range of 67 dB in each section and a low sensitivity to process variations. Thus it is suitable for VLSI implementation with the associated neural network.

A novel design of ergodic sequential logic cochlear single partition model: reproduction of nonlinear compression characteristics of mammalian cochlea and efficient implementation

“…A number of electronic circuits cochlear models have been designed with strong emphases on their applications to cochlear implants [17][18][19][20][21][22][23][24][25][26]. In addition, it has been shown that ergodic sequential logic (SL) biomimetic models are much more hardware-efficient (e.g., consume fewer circuit elements and lower power) compared to standard ordinary differential equation (ODE) biomimetic models [25][26][27][28][29][30].…”