Low-Power UWB LNA and Mixer using 0.18-μm CMOS TechnologyA low-power fully integrated wideband low noise amplifier (LNA) and down-conversion mixer are designed for direct sequence-UWB (DS-UWB) RF front-end using 0.18-μm CMOS technology. The LNA is designed to cover the full UWB bandwidth of 7.5GHz. Measurements show this LNA achieves gain of 14 16.5dB, noise figure (NF) of 4.2 - 4.8dB and IIP3 of -8dBm, consuming 6mA of current from a 1.8-V supply. The mixer is designed using Gilbert-cell topology to work for both DS-UWB bands. Over both bands, the mixer achieves voltage gain of 4 - 6dB, IIP3 of -1dBm, and NF of 14 to 18dB with a supply current of 11.5mA from a 1.8-V supply.
Low-Power Full-Band UWB Active Pulse Shaping Circuit Using 0.18-um CMOS TechnologyA low-power active pulse shaping circuit for ultra wide-band (UWB) dual-band transmitter is presented. The circuit is fully integrated in 0.18-/spl mu/m CMOS technology and only consumes a total power of 10.8mW from a supply voltage of 1.8V. The circuit is composed of a passive part shaping the pulse and an active part providing gain over the whole UWB frequency range (3.1 to 10.6 GHz) to fit the transmitted pulse to the Federal Communications Commission (FCC) mask. This output stage circuit provides a gain of 7 to 8dB across the band of interest.
Fidelity of space TVKing Wah Wong|NASA Technical Reports Server (NASA)|1970 Essa 7, Surveyor 7 and Mariner 4 space TV systems geometric distortions analysis and potentials in analytic photogrammetry and topographical mapping
A 0.18μm CMOS UWB transmitter with reconfigurable pulse widthThis paper describes the design of an impulse based ultra-wideband (UWB) transmitter for short range communications. It consists of a pulse generator, pulse shaping filter, modulator, up conversion mixer, differential to single ended converter and output driver. The configurable pulse width and subsequent shaping maximizes the transmitted energy while complying with the IEEE 802.15.4a emission spectral mask. The transmitter is capable of simultaneously providing binary phase shift keying (BPSK) and on-off keying (OOK) modulated signal. Implemented in 0.18μm CMOS technology, the transmitter draws 47.5mA of current from a 1.8V supply for continuous transmission, and an average current of about 2.66mA for a 2.5ns pulse at 16 mega pulses per second (MPPS) using power management.
Simultaneous Adjustment of Photogrammetric and Geodetic Observations (SAPGO).Abstract : A solution has been developed to permit a simultaneous adjustment of all conventional photogrammetric and geodetic observations. The geodetic measurements included in the solution are: Laplace azimuths, straight-line distances, geodetic azimuths, horizontal angles, elevation differences, latitudes, longitudes and elevations. The photogrammetric measurements include image coordinates, exterior orientation parameters and ground controls in rectangular coordinates. The solution is coded in FORTRAN IV computer language and has been tested with both fictitious and real data.