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This paper presents a low power glitch-free dual-modulus (15/16) prescaler based on the phase-switching for Ultra-Wide Band (UWB) transceiver. An inherently glitch-free phase-switching prescaler is realized by the adoption of a reverse switching sequence without any additional complicated circuit. A simplified model of the source coupled logic (SCL) structure is proposed to optimize the power of the...
This paper presents a novel pseudo-2bit 4GS/s flash analog-to-digital converter (ADC) for an OFDM Impulse Radio Ultra Wide Band (IR-UWB) receiver. Comparing to traditional 2bit flash ADC, it saves a comparator and an encoder. In this ADC, all the signals both in the analog part and the digital part are differential and low swing. A serial-to-parallel module is designed to speed down the output data...
A switched gain wideband differential low noise amplifier (LNA) for the 3.1-5 GHz ultra-wideband (UWB) system is presented. Techniques including serial gate peaking, load shunt peaking, RC feedback networks are used to achieve wideband input matching and large gain bandwidth. To satisfy the requirement of different input power levels, the circuit is designed with two gain mode: high gain mode(HG)...
A high linearity flat conversion gain down-conversion mixer for 3.1˜4.9 GHz Ultra-wide Band (UWB) receiver is presented in this paper. The mixer is designed based on Gilbert cell. It adopts source degeneration resistors and current injection method to improve the linearity. Shunt-peaking technique and tuning inductors are used to flat conversion gain. Designed and fabricated with SMIC 0.18 μm CMOS...
A 4 GS/s 2-bit non-time-interleaved flash ADC is designed for an IR-UWB (Impulse Radio Ultra Wide Band) receiver. In this flash ADC, implementing differential low-swing operation in analog part and CML (current mode logic) in digital part result in high-speed and low power consumption. Furthermore, because of the low-bit-sampling characteristic of the IR-UWB system, non-time-interleaved structure...
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