The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A 2nd-order ΔΣAD modulator architecture is proposed to simplify the operation mode using ring amplifier and SAR quantizer. Proposed modulator architecture can guarantee the reset time for ring amplifier and relax the speed requirement on asynchronous SAR quantizer. The SPICE simulation results demonstrate the feasibility of the proposed 2nd-order modulator in 90nm CMOS technology. Simulated SNDR of...
The key calibration parameters important to instrument health and safety of Ozone Mapping Profiler Suite (OMPS) Nadir Sensors on board Suomi NPP (Suomi National Polar-orbiting Partnership) are being monitored since November 2011 at NOAA/STAR by the Intensive Calibration and Validation System (ICVA). OMPS has two instrument modules: a combined Nadir Mapper (NM) and Nadir Profiler (NP), and a separate...
This paper presents a novel multi-bit feedforward ΔΣAD modulator for low power and high signal-to-noise-and-distortion (SNDR) application. The integrators in the modulator are realized by ring amplifiers without static current. Multi-bit quantizer and analog adder in the feedforward modulator is realized by a passive-adder embedded successive approximation register (SAR) ADC which consists of capacitor...
Electronic and optical crosstalk are radiometric challenges that often exist in the focal plane design in many sensors such as MODIS. A methodology is described to assess the impact due to optical and electronic crosstalk on the measured radiance, and thereafter, the retrieval of geophysical products using MODIS Level 1 data sets. Based on a postulated set of electronic and optical crosstalk coefficients,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.