José Silva-Martínez

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—This paper proposes a solution to the present bulky external capacitor low-dropout (LDO) voltage regulators with an external capacitorless LDO architecture. The large external capac-itor used in typical LDOs is removed allowing for greater power system integration for system-on-chip (SoC) applications. A compensation scheme is presented that provides both(More)
—A technique to enhance the linearity of continuous time operational transconductance amplifiers (OTA)-C filters working at high frequencies is proposed. Each OTA consumes 10.5 mW and the transconductance can be tuned from 70 to 160 A/V while the IM3 remains below 70 dB up to 50 MHz for a 1.3-V pp differential input. For a 20-MHz low-pass second-order(More)
—This paper presents a CMOS RF amplitude detector as a practical integrated test device and demonstrates its application for on-chip testing. The proposed circuit performs full-wave rectification and generates a dc voltage proportional to the amplitude of an RF signal over a wide frequency range. The design considerations and analysis of operation for the(More)
—An ultrahigh-speed fully differential charge pump with minimum current mismatch and variation is proposed in this brief. A mismatch suppression circuit is employed to minimize the mismatch between the charging and discharging currents, which minimizes the steady-state phase error in a phase-locked loop (PLL). A variation suppression circuit is proposed to(More)