Carlos E. Saavedra

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This paper presents a broadband low-noise mixer in CMOS 0.13-¿m technology that operates between 1-5.5 GHz. The mixer has a Gilbert cell configuration that employs broadband low-noise transconductors designed using the noise-cancelling technique used in low-noise amplifer designs. This method allows broadband input matching and without the use of inductors(More)
A multiband flexible RF-sampling receiver aimed at software-defined radio is presented. The wideband RF sampling function is enabled by a recently proposed discrete-time mixing downconverter. This work exploits a voltage-sensing LNA preceded by a tunable LC pre-filter with one external coil to demonstrate an RF-sampling receiver with low noise figure (NF)(More)
An innovative vector-sum phase shifter with a full 360◦ variable phase-shift range is proposed and experimentally demonstrated in this paper. It employs an active balun and a very high-speed CMOS operational transconductance amplifier (OTA) integrator to generate the four quadrature basis vector signals. The fabricated chip operates in the 2–3 GHz, it(More)
An 8.6 GHz × 2 subharmonic mixer with complementary current-reuse to enable ultra-low-voltage and low-power operation is presented. The RF transconductance stage of the mixer uses inductive source degeneration and the mixing core uses four transistors that are driven by a quadrature LO signal. A Volterra series analysis is carried out to determine(More)
A 2.4 GHz CMOS amplifier with third-order intermodulation distortion cancellation is presented based on the derivative superposition technique. The proposed circuit uses a conventional amplifier topology followed by a distortion cancellation circuit that can significantly improve third-order linearity. To quantify the linearity improvement, two(More)