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  • Other Sources  (1,147)
  • ELECTRONICS AND ELECTRICAL ENGINEERING  (1,147)
  • 1990-1994  (1,147)
  • 1
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    Consideration of velocity saturation in the design of GaAs varactor diodes (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The design of GaAs Schottky barrier varactor diodes is reconsidered in light of the recent discovery of velocity saturation effects in these devices. Experimental data is presented which confirms that improved multiplier performance can be achieved.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IEEE Microwave and Guided Wave Letters (ISSN 1051-8207); 3; 6; p. 161-163.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Silicon micromachined waveguides for millimeter-wave and submillimeter-wave frequencies (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Rectangular waveguide is commonly used up to high millimeter-wave frequencies. However, conventional machining techniques for waveguides operating above a few hundred GHz are complicated and costly. The development of silicon micro-machining techniques to create silicon-based waveguide circuits, which can operate up to high submillimeter-wave frequencies, is reported. As a first step, WR-10 waveguide has been fabricated from (110) silicon wafers. Insertion loss measurements of gold plated silicon waveguide show performance comparable to standard metal waveguides. It is suggested that active devices and planar circuits can be integrated with the waveguides, solving the traditional mounting problems.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IEEE Microwave and Guided Wave Letters (ISSN 1051-8207); 3; 3; p. 61-63.
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    NASA TECHNICAL REPORTS
  • 3
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    A new rectenna circuit using a bow-tie antenna for the conversion of microwave power to dc power (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The novel rectenna circuit presented, which integrated a bowtie antenna with a diode, is capable of broadband, high-efficiency operation, and is insensitive to incident field angle. The device is noted, moreover, to behave as a lowpass filter for dc output. For 2.45 GHz operation, a 79-percent conversion efficiency has been demonstrated.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Microwave and Optical Technology Letters (ISSN 0895-2477); 6; 11; p. 655, 656.
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    NASA TECHNICAL REPORTS
  • 4
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    Unfulfilled needs in IR astronomy focal-plane readout electronics (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The NOAO's 8-m IR optimized telescope for Mauna Kea and NASA's SIRTF show that from 1 to 200 microns there are a number of unfulfilled needs in readout electronics. These include: extremely low readnoise, less than 10 electrons, stable operation at temperatures as low as 2 K, high well capacity, greater than 1 e 7 electrons, and integration times from 30 msec to over 100 sec. Sensors for adaptive optics systems are required with readnoise less than 10 electrons and response times of 30 msec. They should be highly efficient from 1 to 2.5 microns, but may have small formats. Ground-based imagers at these wavelengths need comparable readnoise but longer integration times, and the largest possible formats are essential. To achieve these goals improved cryogenic MOSFETS are essential and complete cryogenic CMOS circuits are highly desirable. Experimental cryoptimized MFETS promise to exceed the above noise requirements at 77 K and approach the needs at 2 K.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: In: Infrared readout electronics; Proceedings of the Meeting, Orlando, FL, Apr. 21, 22, 1992 (A93-53076 23-33); p. 168-174.
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  • 5
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    AE 152 cascode readout for far-IR focal plane arrays (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The Amber Engineering AE 152 readout is a 32-channel multiplexer built as part of the FIR focal plane array development effort for the Space Infrared Telescope Facility (SIRTF). The design of the device addresses a number of constraints peculiar to the operation of germanium photoconductors. In particular, the need for a very high level of bias stability is solved by a nonswitched operation of the first stage. Additionally, the readout was optimized for the detector capacitance expected of large bulk photoconductors (about 0.7 pF) and for the slow operating speeds anticipated for this astronomical application. Fabricated in a 1.25-micron C-MOS process, the circuit utilizes a cascode input stage to provide gain at the front end while avoiding the Miller effect. The AE 152 also includes an internal offset correction and a shift register multiplexer for the output. We present test data for this device at a variety of temperatures, and show read noises as low as 8 electrons at a temperature of 77 K.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: In: Infrared readout electronics; Proceedings of the Meeting, Orlando, FL, Apr. 21, 22, 1992 (A93-53076 23-33); p. 55-62.
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  • 6
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    256x256 switched-FET multiplexer for spaceborne astronomical applications (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A novel cryogenic design of a source follower per detector (SFD) direct readout multiplexer is demonstrated. This design has proven to be a good prototype for the development of new low-noise large-area cryogenic multiplexers. In the absence of clocking noise, the readout demonstrates as low as about 30 electrons of rms read noise. There is still an excess noise component feeding through when the array is clocked, which manifests itself only at the lower temperatures. The shape of this component is dependent on a number of the bias voltages, and especially on the temperature of the chip. Analysis of the noise spectral density of the unit cell under various bias conditions shows that there is an excess spectral noise component at the lower temperatures.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: In: Infrared readout electronics; Proceedings of the Meeting, Orlando, FL, Apr. 21, 22, 1992 (A93-53076 23-33); p. 40-48.
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  • 7
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    A 26 to 220 GHz harmonic mixer-receiver (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A wideband mm-wave harmonic mixer-receiver has been developed using a wideband integrated-circuit antenna, a back-to-back Schottky-barrier diode chip and microwave circuit design. The design is planar, simple to build and yields excellent performance from 26 to 180 GHz. Application areas include wideband early warning systems, wideband search and rescue systems and the extension of spectrum analyzer and power meter range to the mm-wave region.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Microwave Journal (ISSN 0192-6225); 36; 7; p. 103-108.
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  • 8
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    Application of multirate digital filter banks to wideband all-digital phase-locked loops design (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A new class of architecture for all-digital phase-locked loops (DPLL's) is presented in this article. These architectures, referred to as parallel DPLL (PDPLL), employ multirate digital filter banks (DFB's) to track signals with a lower processing rate than the Nyquist rate, without reducing the input (Nyquist) bandwidth. The PDPLL basically trades complexity for hardware-processing speed by introducing parallel processing in the receiver. It is demonstrated here that the DPLL performance is identical to that of a PDPLL for both steady-state and transient behavior. A test signal with a time-varying Doppler characteristic is used to compare the performance of both the DPLL and the PDPLL.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: ; : Astrophysical mase
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  • 9
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    An 86-106 GHz quasi-integrated low noise Schottky receiver (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: An integrated planar receiver was developed and tested over the 82-112 GHz bandwidth. The quasi-integrated antenna used in the receiver has a high gain, a high Gaussian coupling efficiency, and a wide bandwidth. The novel mixer design consists of a planar GaAs Schottky diode placed at the feed of a dipole-probe suspended inside an integrated horn antenna. The diode uses an etched surface channel and a planar air bridge for reduced parasitic capacitance. At 92 GHz, the room-temperature antenna-mixer exhibits a double sideband conversion loss and noise temperature of 5.5 +/- 0.5 dB and 770 K +/- 50 K, respectively. The measured DSB conversion loss and noise temperature over a 20 GHz bandwidth (86 GHz-106 GHz) remain less than 6.2 dB +/- 0.5 dB and 1000 K +/- 50 K, respectively. The low cost of fabrication and simplicity of the design makes it ideal for millimeter- and submillimeter-wave receivers.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IEEE Transactions on Microwave Theory and Techniques (ISSN 0018-9480); 41; 4; p. 558-564.
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  • 10
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    Novel miniaturised wideband baluns for MIC and MMIC applications (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Very compact novel planar broadband baluns are described. Each balun consists of two Lange couplers. Less than 0.3 dB and 2.5 deg for the amplitude and phase balances, respectively, have been measured over the 1.0-2.2 GHz bandwidth for a microstrip balun. As compared with other reported baluns, these baluns are simpler, more compact, easier to design, and fabricated on only one side of the substrate. They are thus very attractive for microwave integrated and monolithic integrated circuit applications.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Electronics Letters (ISSN 0013-5194); 29; 12; p. 1060, 1061.
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