This work presents recent results on Secondary Electron flash memory, and contrasts this approach to standard techniques for scaled, low power mass storage applications.
Automatic dependent surveillance‐broadcast (ADS‐B) system requires higher performance, highly reliable, and smaller size, lighter weight and lower cost transceiver. To reduce the size and cost and to increase the manufacturability it is desirable to integrate the whole ADS‐B system into a single‐chip complementary metal–oxide–semiconductor (CMOS) technology platform. Watt level power is required from the ADS‐B transmitter for transmitting the information about aircraft's precise location at larger distances. This study presents CMOS voltage‐controlled oscillator (VCO) circuit, as a part of ADS‐B transmitter, operating at the centre frequency of 978 MHz, delivers the highest output power with the highest efficiency ever reported to the best of authors’ knowledge. The 0.738 mm × 0.606 mm VCO chip fabricated using 0.18 μm CMOS technology, exhibits the single‐ended peak output power of −0.46 dBm and the differential peak output power of 2.54 dBm at the frequency of 1 GHz, with the frequency tuning range from 954.3 to 1009.4 MHz and phase noise of −109 dBc/Hz at 1 MHz offset centred at the frequency of 978 MHz, consuming 19 mW power from 1.8 V supply, thus, showing state‐of‐the‐art‐performances. This promising result shows a path towards realising high‐power single‐chip CMOS ADS‐B transmitter.
This letter presents for the first time the development of a variable gain CMOS phase shifter using 0.18 mm CMOS process in the S-band frequencies to be integrated with conformal phased array beamforming antenna for smart communication radar applications. The vector modulator based phase shifter has an integrated variable gain amplifier codesigned with the phase shifter circuitry in order to be capable of controlling both phase and gain simultaneously which is necessary to recover the degraded radiation pattern due to the conformal shaping of the phased array antenna. The phase shifter achieves measured continuous phase shift of 3038 along with measured 7 dB gain control range over 2-2.60 GHz and an insertion loss of 7.12 dB at 2.2 GHz. The measured DC power consumption of the phase shifter is 34.2 mW from a 2 V supply with a smaller chip area of 1.12 mm 2 including all pads.
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