An OTA-C signal processing FPAA with 305 MHz GBW and integrated frequency-independent filter tuning

摘要

This paper presents a field-programmable analog array (FPAA) with on-chip automatic filter tuning in a 130nm CMOS technology. Parasitic capacitances in the signal nodes are compensated to eliminate the constraints on the regularity of the array and to enable the implementation of 12 capacitance arrays, 2 mixers and 62 OTAs on a die area of 0.8 mm2. The tuning technique is independent on the frequency of the target filter and operates in the full configurable GBW range of a gm-C unit from 42kHz to 305MHz. The implementation is scalable to larger array sizes and enables the configuration of arbitrary filter functions with a deviation (sigma) smaller than 2.175%.