Reconfigurable Filter Design for Implantable Auditory Prosthesis
Multichannel sound processing approaches are used in Cochlear Implant (CI) applications for increased performance. Filterbanks are required for this purpose. Тhe implementation of a fully reconfigurable bandpass filter (BPF) with digital control is presented. Subthreshold transconductors (OTA) are used for lower power consumption and smaller capacitor values. The digital control of the OTA bias currents allows for a fine tuning of the BPF frequency characteristic. The full reconfigurability proves itself useful for non-simultaneous stimulation strategies. The BPF is implemented at transistor level. It covers the 300Hz-5.5kHz audio range and splits it into 6 logarithmically spaced channels. Simulations of the resulting circuit prove the efficiency of the digitally controlled reconfigurable analog blocks. Ill. 12, bibl. 14 (in English; summaries in English, Russian and Lithuanian).
Authors retain copyright and grant the journal the right of the first publication with the paper simultaneously licensed under the Creative Commons Attribution 4.0 (CC BY 4.0) licence.
Authors are allowed to enter into separate, additional contractual arrangements for the non-exclusive distribution of the paper published in the journal with an acknowledgement of the initial publication in the journal.
Copyright terms are indicated in the Republic of Lithuania Law on Copyright and Related Rights, Articles 4-37.