• A compact functional verification flow for a RISC-V 321 based core 

      Molina Robles, Roberto; Solera Bolanos, Edgar; García Ramírez, Ronny; Chacón Rodríguez, Alfonso; Rimolo Donadio, Renato; Arnaud Maceira, Alfredo (IEEE, 2020)
      The structure of a functional verification flow used for the design of a RISC-V core is presented. The paper offers a guide on the test-planning used and details of the flow architecture, showing how to integrate the ...
    • A RISC-V based medical implantable SOC for high voltage a current tissue stimulus 

      Arnaud Maceira, Alfredo; Gak Szollosy, Joel; García Ramírez, Ronny; Rimolo Donadio, Renato; Miguez De Mori, Matías Rafael; Puyol, Rafael; Solera Bolanos, Edgar; Castro González, Reinaldo; Molina Robles, Roberto; Chacón Rodríguez, Alfonso (IEEE, 2020)
      A RISC-V based System on Chip (SoC) for high voltage and current tissue stimulus, targeting implantable medical devices, is presented. The circuit is designed in a 0.18μm HV-CMOS process, including the RISC-V 32RVI based ...
    • A Self-biased Current Source, using an Asymmetric Bulk-modified MOS Composite Transistor 

      Costa, Diego; Míguez, Matías; Gak Szollosy, Joel; Arnaud Maceira, Alfredo (IEEE, 2020)
      In this work a new topology for a self-biased current reference, based on an asymmetric bulk-modified MOS (ABM) composite transistor is presented. Two current references based in this technique were designed: a 13.5nA ...
    • An affordable post-silicon testing framework applied to a RISC-V based microcontroller 

      Molina Robles, Roberto; García Ramírez, Ronny; Chacón Rodríguez, Alfonso; Rimolo Donadio, Renato; Arnaud Maceira, Alfredo (IEEE, 2021-04)
      The RISC-V architecture is a very attractive option for developing application specific systems needing an affordable yet efficient central processing unit. Post-silicon validation on RISC-V applications has been done in ...
    • An asymmetrical bulk-modified composite MOS transistor with enhanced linearity 

      Arnaud Maceira, Alfredo; Chacón Rodríguez, Alfonso; Miguez de Mori, Matías Rafael; Gak Szollosy, Joel; Puyol, Rafael (IEEE, 2019)
      In this work, an asymmetrical bulk-linearized composite MOSFET is presented, with an enhanced linear range and an equivalent saturation voltage of up to several hundred mV even in weak inversion, allowing to implement ...
    • An Integrated 350V Dimmer 

      Torres Álvarez, Fabián; Gak Szollosy, Joel; Arnaud Maceira, Alfredo; Míguez, Matías (IEEE, 2020)
      The design of an almost fully integrated phase-cut dimmer is presented. The circuit was designed on a 1um ultra high voltage (UHV) MOS technology in a silicon-on-insulator (SOI) wafer. The dimmer can operate with a duty ...
    • CMOS level shifters from 0 to 18 V output 

      Gak Szollosy, Joel; Arnaud Maceira, Alfredo; Miguez de Mori, Matías Rafael (Springer, 2021)
      A design methodology for level shifters voltage translators, where the output voltage ranges from 0 to 18 V, and the input voltage ranges from 2 to 5.5 V in a 0.6 lm CMOS-HV technology, is presented. This family of circuits ...
    • Integrated programmable current source for implantable medical devices 

      Rimolo Donadio, Renato; Chacón Rodríguez, Alfonso; Gak Szollosy, Joel; García Ramírez, Ronny; Miguez de Mori, Matías Rafael; Arnaud Maceira, Alfredo; Hardy, D.; Agis, L.; Nakasone Lanza, Kenji Sebastián (IEEE, 2020)
      In this work, the design and implementation of a 25mA (max), 8 bits integrated programmable current source for implantable medical devices is presented. The proposed circuit includes a six-bits trimming mechanism to balance ...
    • Siwa: A custom RISC-V based system on chip (SOC) for low power medical applications 

      García Ramírez, Ronny; Chacón Rodríguez, Alfonso; Molina Robles, Roberto; Castro González, Reinaldo; Solera Bolanos, Edgar; Madrigal Boza, Gabriel; Oviedo Hernández, Marco; Salazar Sibaja, Diego; Sánchez Jiménez, Dayhana; Fonseca Rodríguez, Melissa; Arrieta Solorzano, Johan; Rimolo Donadio, Renato; Arnaud Maceira, Alfredo; Miguez de Mori, Matías Rafael; Gak Szollosy, Joel (Elsevier, 2020)
      This work introduces the development of Siwa, a RISC-V RV32I 32-bit based core, intended as a flexible control platform for highly integrated implantable biomedical applications, and implemented on a commercial 0.18 𝜇m ...
    • Siwa: a RISC-V RV32I based micro-controller for implantable medical applications 

      García Ramírez, Ronny; Chacón Rodríguez, Alfonso; Castro González, Reinaldo; Arnaud Maceira, Alfredo; Miguez de Mori, Matías Rafael; Gak Szollosy, Joel; Molina Robles, Roberto; Madrigal Boza, Gabriel; Oviedo Hernández, Marco; Solera Bolanos, Edgar; Salazar Sibaja, Diego; Sánchez Jiménez, Dayhana; Fonseca Rodríguez, Melissa; Arrieta Solorzano, Johan; Rimolo Donadio, Renato (IEEE, 2020)
      The design of Siwa1, a compact low power custom system on chip (SoC), targeted for implantable/wearable applications, is reported in this paper. Siwa is based on a RISC-V RV32I architecture. It has a centrally controlled ...
    • The RISC-V in implantable medical devices 

      Arnaud Maceira, Alfredo (RISC-V, 2019-12)
      In this work, first, the case of implantable medical devices (IMDs) will be presented including state of the art and industry overview. The main characteristics of IMD ASICs are discussed (technical, engineering, business ...