A low-power, configurable auto-gain control loop for a digital hearing aid system on a chip （SoC） is presented. By adopting a mixed-signal feedback control structure and peak detection and judgment, it can work in a...A low-power, configurable auto-gain control loop for a digital hearing aid system on a chip （SoC） is presented. By adopting a mixed-signal feedback control structure and peak detection and judgment, it can work in automatic gain or variable gain control modes through a digital signal processing unit. A noise-reduction and dynamic range （DR） improvement technique is also used to ensure the DR of the circuit in a low-voltage supply. The circuit is implemented in an SMIC 0.13 μm 1P8M CMOS process. The measurement results show that in a I V power supply, 1.6 kHz input frequency and 200 mVp-p, the SFDR is 74.3 dB, the THD is 66.1 dB, and the total power is 89 μW, meeting the application requirements of hearing aid SoCs.展开更多
基金supported by the Chinese National Science and Technology Expertise Program(No.Y1GZ212001)
文摘A low-power, configurable auto-gain control loop for a digital hearing aid system on a chip （SoC） is presented. By adopting a mixed-signal feedback control structure and peak detection and judgment, it can work in automatic gain or variable gain control modes through a digital signal processing unit. A noise-reduction and dynamic range （DR） improvement technique is also used to ensure the DR of the circuit in a low-voltage supply. The circuit is implemented in an SMIC 0.13 μm 1P8M CMOS process. The measurement results show that in a I V power supply, 1.6 kHz input frequency and 200 mVp-p, the SFDR is 74.3 dB, the THD is 66.1 dB, and the total power is 89 μW, meeting the application requirements of hearing aid SoCs.
