Hirobumi Saito

Direct Measurement of SET Pulse Widths in 0.2-

Heavy-ion-induced SET-pulse widths in NOR-logic cells fabricated by a 0.2-mum FD-SOI technology are directly measured by using an on-chip self-triggering flip-flop circuit. The pulse widths are distributed from 0.3 to 1.0 ns under a constant LET of 40 MeVmiddot cm 2/mg

\mu

Single event transient (SET) pulse-widths were measured as a function of linear energy transfer (LET) by using pulse capture circuits and simulated with mixed-mode 3-D device simulations. We found that the carrier recombination process dominates the LET dependence of the pulse-widths.

m SOI Logic Cells Irradiated by Heavy Ions

Waveforms of digital single-event transients, radiation-induced voltage transients in logic gates, can be observed by connecting two transistors to a target logic gate. Additional transistors monitor voltage transients through their drain currents, which can be measured using the conventional 50-Omega transmission-line technique widely used for measuring transient currents in single elementary transistors. Experimental results obtained in pulsed-laser irradiation tests demonstrate the validity of the observation technique and clearly reveal the pulse evolution as a function of the laser pulse energy.

LET Dependence of Single Event Transient Pulse-Widths in SOI Logic Cell

The 128-kb SOI SRAMs without body-ties had a threshold LET of 3.6 MeV/(mg/cm/sup 2/), which was increased to 9.0 MeV/(mg/cm/sup 2/) by adding body-ties. We used a mixed-mode three-dimensional simulation to analyze the effects of the body-ties on SEU resistance for FD SOI SRAMs with 0.2-/spl mu/m design rules. The simulations revealed an increase in the threshold LET from 5.8 to 8.1 MeV/(mg/cm/sup 2/) that was mostly due to the reduced bipolar gain of the parasitic bipolar transistor and partly due to the added capacitance, which were both related to the body-ties.

Waveform Observation of Digital Single-Event Transients Employing Monitoring >Transistor Technique

Abstract A single mode oscillation on the circular free electron laser has been studied. The operation mode was TM 81 (11.77 GHz) whose frequency width was 0.3% (= Δ f/f ) and the total radiation power was about 600 kW using a rotating hollow electron beam (442 kV). The observed permissible detuning between the oscillation frequency and the beam mode was 3% at TM 81 oscillation.

Analysis of body-tie effects on SEU resistance of advanced FD-SOI SRAMs through mixed-mode 3-D Simulations

Parallel-plate slot array antenna fed by rectangular waveguides at its lower-edge sides has been proposed. This antenna panel can be applied for dual circularly polarized deployable synthetic aperture radar (SAR) antenna onboard small satellite. As to confirm the feasibility of the antenna implementation, a development of one panel antenna system with single polarization (RHCP) has been conducted. The antenna design with simplified model by high-frequency structure simulator (HFSS) and antenna measurement results are explained in this paper. It is shown that antenna with gain and efficiency of 34.9 dBic and 54%, respectively, are achieved at the targeted center frequency (9.65 GHz).

Experimental mode analysis of the circular free electron laser

We designed a phase-locked loop (PLL) operating at 200 MHz using 0.2 µm fully depleted silicon-on-insulator (SOI) technology. By SPICE simulation with an appropriate single-event transient (SET) model, we achieved a radiation-hardened PLL that does not cause a SET upset upon ion irradiation with a linear energy transfer (LET) of 50 MeV-cm2/mg at an areal penalty of 75%.

Parallel-Plate Slot Array Antenna for Deployable SAR Antenna Onboard Small Satellite

Magnetic attitude control methods for the REIMEI microsatellite are studied. The REIMEI satellite is a 70 (kg) microsatellite and was launched in 2005. This satellite achieved pointing accuracy of 0.05 - 0.1 (deg), with three magnetic torquers (MTQs) and one moment wheel. With this configuration, the management of magnetic torque is important for attitude control. This paper proposes practical MTQs drive algorithm to generate required magnetic torque, maintaining undesirable disturbance torque to be low enough even in the neighborhood of singular points. Another key technology is in-orbit estimation of residual magnetic dipole and its feedforward cancellation. This method will contribute a lot, not only for a bias momentum satellite, but also for small/micro satellites with pure magnetic attitude control system. These proposed methods are demonstrated with in-orbit data of the REIMEI microsatellite.

Radiation-hardened phase-locked loop fabricated in 200 nm SOI-CMOS

One panel of a deployable parallel plate slot array antenna fed by rectangular waveguide at its lower-edge side has been designed, fabricated and measured. This antenna operates in X-band with right handed circularly polarized radiation. The antenna system is entirely designed using HFSS simulator. From the measurement result, it is shown that at its center frequency (9.65 GHz), 80% aperture efficiency with the directivity of 36.5 dBic and 55% antenna efficiency with the gain of 34.9 dBic are achieved. About 1.6 dB of total antenna loss is confirmed.

Design and on-orbit evaluation of magnetic attitude control system for the “REIMEI” microsatellite

Fiber Optical Gyroscopes (FOGs) have been used as satellite attitude sensor because of low power and small body. To keep FOG bias rate stable, temperature control is needed. However it is repoted that thermal input of temperature control causes Shupe effect. Due to Shupe effect, bias stability of FOG is deteriorated. In this paper, Shupe effect compensation method of FOG with temperature control is proposed. Experimental results show proposed method is efficient to compensate Shupe effect. And as a result of Shupe effect compensation, FOG performance of all time range is improved.