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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 685 records · Page 38
All sourcesNASA NTRSDOE OSTI
NASA NTRS2013

A 294 GHz 0.47m W Caterpillar amplifier based transmitter in 65 nm CMOS for THz data-links

A fully integrated CMOS THz transmitter for short range data-links is presented which provides 0.47 mW of output power to 294 GHz. The output frequency is derived from a 147 GHz on-chip LO and fully differential caterpillar power amplifier combined with a transformer coupled frequency doubler. The transmitter is integrated with an on-chip dipole antenna for use in THz communication systems and consumes a total of 258 mW.

Chang, Mau-Chung Frank↗
NASA NTRS2021

Linear Systems LSK389 and LSK489 Dual N-Channel JFET Amplifier Total Ionizing Dose and Single-Event Effects Test Report

The purpose of these tests was to characterize the susceptibility of the LSK389 and LSK489 Dual N-Channel JFET from Linear Systems to Single-Event Latchup due to heavy ions and to Total Ionizing Dose (TID) degradation at -65 °C and intermediate dose rate. The test was carried out to assess suitability of the amplifiers for the Ocean Color instrument (OCI) on the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) spacecraft.

Ray Ladbury↗
NASA NTRS2020

Noise Evaluation of Various High-gain, Very-low-noise Current Sense Amplifier Circuits

We report an evaluation of three different electronic topologies for a high-gain, very-low-noise current sense amplifier (CSA) for use in remote sensing applications. The circuits in question were built from commercially available parts and were evaluated for their performance in an interface to a photodetector used in NASA’s Lunar Flashlight infrared spectrometer spacecraft. Through constraints on the test environment, we were able to reduce the impact of systematic noise sources by making them common mode to the measurement. The parts compared were based on the ADA4530-1, the LTC6240, and the LSK389A. We determined which of the three different versions of the CSA had superior noise performance for selection for use on the instrument. Two tests and simulations of each board compare and contrast functionality and performance, both qualitatively and quantitatively, and based on those results, we show that the ADA4350-1 out-performed the opposing components.

Foor, David↗
NASA NTRSDate not supplied

System Level TVAC Functional Testing for the Integrated LCRD Low-Earth Orbit User Modem and Amplifier Terminal (ILLUMA-T) Payload Destined for the International Space Station

The Integrated LCRD Low-Earth Orbit User Modem and Amplifier Terminal (ILLUMA-T) Payload will be launched to the International Space Station (ISS) in 2023. ILLUMA-T is an optical communications payload that will make the ISS the first space-based user to communicate with NASA’s Laser Communications Relay Demonstration (LCRD). The system will support all-optical forward links up to 150 Mbps and return links up to 1 Gbps. The payload recently underwent system level Thermal VACuum (TVAC) functional testing at MIT Lincoln Laboratory. We present an overview of the payload’s TVAC functional tests and results.

lasercom↗
NASA NTRSDate not supplied

System Level TVAC Functional Testing for the Integrated LCRD Low-Earth Orbit User Modem and Amplifier Terminal (ILLUMA-T) Payload Destined for the International Space Station

The Integrated LCRD Low-Earth Orbit User Modem and Amplifier Terminal (ILLUMA-T) payload will be launched to the International Space Station (ISS) in 2023. ILLUMA-T is an optical communications payload that will make the ISS the first space-based user to communicate with NASA’s Laser Communications Relay Demonstration (LCRD). The system will support all-optical forward links up to 150 Mbps and return links up to 1 Gbps. The payload recently underwent system level Thermal VACuum (TVAC) functional testing at MIT Lincoln Laboratory. We present an overview of the payload’s TVAC functional tests and results.

laser communications↗
NASA NTRS2022

Single-Event Effects Test Report Texas Instruments, OPA842 Low-Noise Operational Amplifier

Testing was done to characterize the Texas Instruments Operational Amplifiers OPA842 single event effects (SEE) response. The primary SEE concerns for this device are single event latchup (SEL) and single event transients (SETs). Testing focused on determining susceptibility to SEL and characterizing the SET response. Testing occurred on November 11, 2022.

Kaitlyn L Ryder↗
NASA NTRSDate not supplied

Ka-Band GaN-on-SiC MMIC Balanced High Power Amplifier for NASA's Lunar Missions

The feasibility of Ka-band GaN-on-SiC MMIC based balanced high power amplifier (HPA) for science data downlinks from NASA’s Lunar mission assets in space is investigated. The HPA combines the RF output power from two PAs using a rectangular waveguide based 3-dB hybrid coupler. The investigation includes characterizing the HPA for the overall RF output power, Gain, PAE, RMS EVM for offset-QPSK, 8PSK, 16APSK, and 32APSK waveforms, Spectrum, 3rd order IMD products, noise figure, phase noise, & group delay. The HPA has high Pout and good linearity and can support high data rate downlinks from the surface and vicinity of the Moon to Earth.

Rainee.N. Simons↗
NASA NTRSDate not supplied

Experimental Results from Integrated LCRD Low-Earth Orbit User Modem and Amplifier Terminal (ILLUMA-T) Program

The National Aeronautics and Space Administration’s (NASA) Integrated LCRD Low-Earth Orbit (LEO) User Modem and Amplifier Terminal (ILLUMA-T) payload was launched and installed on the International Space Station’s (ISS) Japanese Experiment Module - Exposed Facility (JEM-EF) in November 2023. ILLUMA-T was the first space-based user to communicate with NASA’s Laser Communications Relay Demonstration (LCRD) using free space optical communication to transfer data from the ISS at return rates to Earth of up to 1.244 Gbps and forward rates from Earth of up to 155 Mbps. A 6-month long Experiments Program on ILLUMA-T concluded in June 2024, after which the payload was removed from the ISS and is currently de-orbiting. The Experiments Program was carefully designed to understand and characterize the Pointing, Acquisition, and Track (PAT) process with the new Modular, Agile, Scalable Optical Terminal (MAScOT), optical modem performance, and end-to-end relay performance.

ISS↗
NASA NTRS2000

Ka-band Solid State Power Amplifier (KAPA)

Communications subsystems for furture missions must be low-mass and enable equivalent if not great data return to the scientific community over the current X-band (8.4 GHz) links.

Ka-band Solid State Power Amplifier Deep Space One↗