David Cordova

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BACKGROUND Recent studies have demonstrated that high human immunodeficiency virus (HIV) prevalence (2.1%) rates exist in "high-risk areas" of US cities that are comparable to rates in developing nations. Community-based interventions (CBIs) have demonstrated potential for improving HIV testing in these areas, thereby facilitating early entry and engagement(More)
The necessary conditions to design MOSFET transconductors with low temperature dependence are analysed and defined in this paper. Transconductors, or Gm circuits, are fundamental blocks used to implement adjustable filters, multipliers, controlled oscillators, amplifiers and a large variety of analog circuits. Temperature stability is a must in such(More)
The continuous scaling of CMOS devices has required the consequent reduction of the supply voltages. There is a need for analog and RF circuits able to operate under at supplies lower than 0.5 V. This paper presents a voltage reference based on the MOSFET zero-temperature condition (ZTC) that operates with a low 0.5 V supply. The circuit is composed by a(More)
BACKGROUND Despite ongoing prevention efforts, HIV and other sexually transmitted infections (HIV/STIs) and drug use remain public health concerns. Urban adolescents, many of whom are underserved and racial minorities, are disproportionately affected. Recent changes in policy, including the Affordable Care Act, and advances in technology provide HIV/STI and(More)
An electromagnetic interference (EMI) source can significantly degrade the performance of a current reference since its finite Power Supply Rejection Ratio (PSRR) of the later. For that reason A modified current reference with high immunity to EMI and a new current mirror structure insensitive to induced EMI are proposed based on the classic boot-strapped(More)
The linearity and noise requirements in multi-band multi-standard applications make the design of RF CMOS mixers a very challenging task. In this paper a new highly linear CMOS mixer based on the Gilbert-cell topology is proposed. We introduce a second- and third-order distortion cancellation mechanisms using Post-distortion harmonic cancellation (PDHC). A(More)
A self-biased current reference based on the MOSFET Zero Temperature Coefficient (ZTC) condition is presented. It can be implemented in any CMOS process and it provides a simple alternative to design a reference current suitable for low TC biasing. This topology was designed in a 0.18 μm process to generate 5 μA under a supply voltage from 1.4V to 1.8(More)
  • Richard T Bedea, John G Bruhn, Ann Marie Ellis, Sarah C Brabant, Steven R Couch, Barry Glassner +56 others
  • 2013
The Clinical Sociology Review is published by Jednota Press, in association with the Sociological Practice Association, a professional organization of clinical and applied sociologists. Abstracts of all articles appear in Sociological Abstracts and selected abstracts appear in Social Work Research and Abstracts Clinical sociology involves the creation of(More)
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