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We propose an image rejection type direct RF undersampling receiver. By using a direct RF I/Q sample and hold (S/H) circuits, and 90 degree power combiners in the digital domain, upper side band (USB) and lower side band (LSB) signals can be separated into two different (USB and LSB) output ports, therefore the image rejection functionality can be realized with half of the clock frequency of the conventional...
A new waveguide-to-microstrip transducer has been developed using a polytetrafluoroethylene printed circuit board. This can fully cover the W-band (75 GHz-110 GHz), and the transmission loss is typically 0.77 dB. Combining the transducer with a 2nd-order harmonic mixer, a W-band frequency converter has been successfully developed. An up-conversion gain of −20.0 dB and down-conversion gain of −22.3...
We have developed a high speed gate switching type Ku-band CMOS amplifier for direct RF undersampling receiver. This amplifier will synchronize its d.c. power switch timing to the sampling clock of the direct RF undersampling receiver. For Ku-band VSAT application, we designed the sampling clock frequency of undersampling receiver as 600 MHz, therefore the power switching time (Turn-On Time) of less...
Ihis paper describes the design and development of a single-sideband receiver using semiconductor Schottky and MMIC technology operating at room temperature from 67 GHz to 116 GHz to meet the extended frequency range of ALMA Band 2&3 simultaneously. Special care has been taken to design a fundamental balanced mixer that is sensitive from cut-off frequency up to second propagation mode of the WR-10...
Presented is an 89 GHz waveguide coupled direct detector based on ACST low-barrier Schottky diodes. Signal-to-noise ratio (SNR) values above 35 dB within 6 dB input power dynamic are achieved with high voltage responsivity of 3000 V/W and significant white and 1/f noise reduction. The fabricated detector is characterized and compared to simulation results, proving a high accuracy level of the design...
This paper presents the characterization measurements and simulations performed with ACST InGaAs low-barrier Schottky diodes for millimeter wave mixing applications. While these low-barrier Schottky diodes have been successfully used for millimeter wave detector design, their performance when acting as mixers has not been tested yet. This paper shows the performance for this type of diodes in a fundamental...
The reliability of the equipment that will be used in the MetOp Second Generation satellites is crucial, since there are significant storage and in-operation times. To evaluate the reliability performance of these receivers ESA has set up projects to assess these issues in advance. The most critical parts within the receivers of the atmospheric sounder and imager instruments are identified to be the...
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