An Energy-Efficient Analog Front-End Circuit for a Sub-1-V Digital Hearing Aid Chip

A Sub 1V 96 ¿W Fully Operational Digital Hearing Aid Chip With Internal Status Controller

“…Each part has own combination of the clock frequency and order of the Σ-∆ modulator to achieve different SNR values. In the previous work, control register and a DSP with external control signal is applied to determine the clock frequency and order of the Σ-∆ modulator [1]. In this work, status controller is implemented to achieve fully operational ASNR technique of the Σ-∆ ADC without any external control signal.…”

“…In these days, the enormous attention of the bioelectronics system market requires new design methodologies to achieve both low power and high performance [1][2][3]. Especially more and more people suffer from their hearing problems, and the number of people with some degree of hearing loss continuously increased every year [4].…”

“…In this paper we present a fully operational one chip implementation of a digital hearing aid with less than 100 µW power consumption. This chip is based on our previous lowpower analog front-end circuit for digital hearing aid [1] and a status controller, a low-power dedicated DSP and heterogeneous Σ-∆ DAC are integrated newly for the full function of digital hearing aid. Fig.…”

“…1 shows the proposed one chip digital hearing aid architecture. In order to achieve high programmability and accurate preamplification with low-power consumption, the combined gain control (CGC) preamplifier is designed [1]. The Σ-∆ ADC chooses the adaptive-SNR (ASNR) technique to acquire low power dissipation and wide dynamic range according to the external environment [1].…”

A Low Power Digital Signal Processor with Adaptive Band Activation for Digital Hearing Aid Chip

“…There have been active researches to achieve both high flexibility and low power consumption at once. One approach is to use a single configurable filter to divide only hi and lo bands [1] [2]. While this approach is simple and power efficient, it is only applicable to patients with specifically shaped audiograms and thus has limited flexibility.…”