Turgut Aytur

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A direct-conversion ultra-wideband (UWB) transceiver for Mode 1 OFDM applications employs three resonant networks and three phase-locked loops. Using a common-gate input stage, the receiver allows direct sharing of the antenna with the transmitter. Designed in 0.13-/spl mu/m CMOS technology, the transceiver provides a total gain of 69-73 dB and a noise(More)
A 128-channel pulse-swallow frequency synthesizer includes a 3-mW VCO, a 2.2-mW 16/17 dual-modulus prescaler, a 9-b program counter, and a 7-b swallow counter. The circuit is fully integrated with the exception of the loop-filter capacitor. The ECL prescaler incorporates current sharing and circuit stacking techniques to reduce power consumption. Fabricated(More)
A direct-conversion UWB transceiver for mode 1 OFDM applications employs three resonant networks and three PLLs. Designed in a 0.13 /spl mu/m CMOS technology, the transceiver provides a total gain in the range of 69 to 73 dB, an NF in the range of 5.5 to 8.4 dB across three bands, and a TX P/sub 1dB/ of -10 dBm. The circuit consumes 105 mW from a 1.5 V(More)
A time-interleaved pipeline ADC is designed with the reconfigurable resolution and sampling rate, F<sub>s</sub>, to accommodate different operation scenarios. The main offset and gain mismatches between four sub-ADCs are modulated to the frequency of F/2 by the reference-and opamp-sharing techniques. Fabricated in 90 nm CMOS, the 7 bit ADC has an ENOB of(More)
This paper presents the design of UWB transceivers from both system-level and circuit-level perspectives. Following a detailed analysis of the impact of RF imperfections on the performance of the system, we review a number of transceiver and synthesizer architectures that can satisfy the MBOA UWB standard requirements. Next, we describe a new transceiver(More)
A direct-conversion RF transceiver and digital PHY are integrated in a single 0.13mum digital CMOS chip. Designed for UWB OFDM operation as proposed by the WiMedia Alliance, the device supports both fixed and frequency-hopped modes in the band of 3.1 to 4.8GHz. The RF transceiver draws 100mA in receive mode and 70mA in transmit mode, and the complete chip(More)
In addition to broadband gain and input matching requirements, the UWB standard also poses a tight specification on the band switching time (9ns), thus precluding the direct synthesis of frequencies by phase locking. An approach suggested for this task incorporates a single phase-locked loop (PLL) and a number of single-sideband (SSB) mixers to generate(More)
Two types of broadband end-fire antennas are developed for sectorized coverage of 60-GHz Wireless Personal Area Networks (WPAN) applications. The first one is an integrated horn antenna in RO4000 laminates. Using the combination of through-, blind-, and buried-vias, a horn structure with both E- and H-plane flares can be mapped into a multilayer laminated(More)
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