Low-Power Current Integrating Flat-Passband Infinite Impulse Response Filter for Sensor Read-Out Integrated Circuit in 65-nm CMOS Technology

Low-power current integrating infinite impulse response filter having flat-passband for sensor read-out integrated circuit is proposed. In a current integrating filter, passband flatness degradation is inevitable due to sinc-like filtering characteristics. In this paper, by proposing a high order infinite impulse response filter architecture, flat-passband characteristic can be achieved. By implementing a filter architecture with a flat passband, the required sampling frequency can be lowered, which in turn can reduce power consumption. Moreover, the proposed high order infinite impulse response filter architecture has a high degree of freedom on adjusting input sample weights. The proposed integrated circuit is implemented in TSMC 65-nm CMOS process and operated on 1.2 V supply voltage.

Automated summary

This paper proposes a low-power current integrating infinite impulse response filter with a flat-passband for sensor read-out integrated circuits. In a current integrating filter, passband flatness degradation is unavoidable due to its sinc-like filtering characteristics. By introducing a high order infinite impulse response filter architecture, a flat-passband characteristic can be achieved. The implementation of this filter architecture with a flat passband can lower the required sampling frequency and subsequently reduce power consumption. Furthermore, the proposed high order infinite impulse response filter architecture provides a high degree of freedom in adjusting the weights of input samples. The integrated circuit is implemented in TSMC 65-nm CMOS process and operates on a 1.2 V supply voltage.