Environmental Adaptive Programmable Analog LSI

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This study is focusing on the programmable technologies for analog LSIs, which serve the high tolerance to the aging degradation and environmental variation. The contributions of this study are summarized as follows;(1) We proposed the PDTB (Programmable Differential-pair Transistor Block) which make use of the differential amplifier circuit as an element, and developed the CAB (Configurable Analog Block). The CAB is composed of (a)Vth-tuning circuit by body biasing, (b)pMOS-/nMOS-PTDB, (c)pMOS/nMOS transistor array, (d)resistor and capacitor array, and (e)routing resource and switch matrix.(2) We clarified the influence on DC/AC characteristics of analog circuits by the decomposition of the channel length (L) of MOS transistors. Through evaluating the test chip, we revealed that 2-L and 4-L decomposition do not matter in the DC/AC characteristics. Furthermore, we developed the Programmable Delay Element (PDE) by applying L-decomposition with a switching mechanism.(3) We proposed the programmable metal-to-metal capacitor array which has a low temperature dependency, and also present the capacitance evaluation methodology by employing the SAR-ADC mechanism.