Showing papers by "Jose Silva-Martinez published in 2000"
01 Feb 2000
TL;DR: In this article, an updated version of a 1985 tutorial paper on active filters using operational transconductance amplifiers (OTAs) is presented, and the integrated circuit issues involved in active filters (using CMOS transconductances amplifiers) and the progress in this field in the last 15 years is addressed.
Abstract: An updated version of a 1985 tutorial paper on active filters using operational transconductance amplifiers (OTAs) is presented. The integrated circuit issues involved in active filters (using CMOS transconductance amplifiers) and the progress in this field in the last 15 years is addressed. CMOS transconductance amplifiers, nonlinearised and linearised, as well as frequency limitations and dynamic range considerations are reviewed. OTA-C filter architectures, current-mode filters, and other potential applications of transconductance amplifiers are discussed.
343 citations
TL;DR: In this article, a complementary metal-oxide-semiconductor (CMOS) sixth-order 2.4 Hz low-pass fitter for medical applications is presented, which has shown a dynamic range (DR) of 60 dB, while the harmonic distortion components are below -50 dB.
Abstract: The design and implementation of a fully integrated complementary metal-oxide-semiconductor (CMOS) sixth-order 2.4 Hz low-pass fitter (LPF) for medical applications is presented. For the implementation of large-time constants both linearized operational transconductance amplifiers with reduced transconductance and impedance scalers schemes for grounded capacitors are employed. Experimental results for the filter have shown a dynamic range (DR) of 60 dB, while the harmonic distortion components are below -50 dB. The power consumption for the filter is below 10 /spl mu/W, the power supply is /spl plusmn/1.5 V, and the active area is 1 mm/sup 2/. The filter was fabricated in a double poly double metal 0.8 /spl mu/m CMOS process.
203 citations
28 May 2000
TL;DR: A compact and fully programmable Gaussian function circuit with temperature compensation is introduced and breadboard results for the Gaussian circuit generator, in good agreement with the theoretical ones, are reported.
Abstract: A compact and fully programmable Gaussian function circuit with temperature compensation is introduced. The programmability of the Gaussian circuit generator is carried out by using current sources. Hspice simulations for the proposed structure have shown deviations from the ideal Gaussian function below 3%. Breadboard results for the Gaussian circuit generator, in good agreement with the theoretical ones, are reported.
8 citations
28 May 2000
TL;DR: A family of CMOS Operational Transconductance Amplifiers have been designed for very small G/sub M/'s in the moderate inversion region of operation using several design schemes such as current division, floating gate input stages and bulk driven techniques.
Abstract: A family of CMOS Operational Transconductance Amplifiers (OTA's) have been designed for very small G/sub M/'s (of the order of nA/V) in the moderate inversion region of operation using several design schemes such as current division, floating gate input stages and bulk driven techniques. A detailed comparison has also been made among these schemes in terms of performance characteristics such as power consumption, active silicon area and signal to noise ratio (SNR). The design has been sent for fabrication in a 1.2 /spl mu/m n-well CMOS process with a power supply of 2.7 V.
7 citations