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A 65-nm CMOS IC containing a synthesizer, a continuous-time bandpass delta-sigma ADC and associated digital filter digitizes 200–400 MHz inputs with bandwidths up to 100 MHz. With the ADC clock supplied by the internal synthesizer, the observed phase noise on a 430-MHz carrier is −137 dBc/Hz at 750-kHz offset. The gain of the IC is adjustable over a 39-dB range using an LNA in parallel with a resistive...
Admission and rate control are key components for providing QoS (Quality of Service) flows in multi- rate wireless ad hoc networks where transmission rate at the physical layer is adapted dynamically according to the channel condition. Key to these controls is the formulation of a rate constraint that can regulate the flow rate passing through each node. This paper formulates a cross-layer rate constraint...
Recently, a new bistatic point target reference spectrum, which is called extended Loffeld's bistatic formula (ELBF) is proposed. The point target simulation shows that this method can work well in the general bistatic configuration. In this paper, physical optics (PO) method is introduced to calculate the echo data from three dimensional targets for bistatic SAR. Then the original LBF and ELBF are...
A tri-band (bands I, II, V/VIII) single-chip RFIC has been designed in 0.18 ??m SiGe BiCMOS process to meet HSDPA Category 8 requirements. Competitive radio RF performance necessitates optimum tradeoff of design challenges. The transceiver relies on front-end SAW filters for increased system performance margins. Calibration schemes for receive DC offset, transmit carrier leakage, and VCO frequency...
A multi-band (bands I, II, V, VIII [option]) single-chip RFIC has been implemented in 0.18 mum SiGe BiCMOS process for WCDMA/HSDPA applications. The direct-conversion receiver achieves competitive system performance: -110.5dBm sensitivity, 20 dB and 12 dB blocking margin for ACS case 1 and case 2, respectively, and excellent in-band blocking margins. The direct-modulation transmitter achieves more...
An efficient sensor array test-bed compatible with direction finding indoor test applications at communication-band is developed. It provides the test flexibility of DF accuracy including the different antenna configuration, DF algorithms and modulation schemes considering with instrumental errors induced by multi-channel receivers. The ability of test-bed is useful for system designers who are involved...
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