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A fourth-order quadrature bandpass continuous-time sigma–delta modulator for a dual-channel global navigation satellite system (GNSS) receiver is presented. With a bandwidth (BW) of 33 MHz, the modulator is able to digitalize the downconverted GNSS signals in two adjacent signal bands simultaneously, realizing dual-channel GNSS reception with one receiver channel instead of two independent receiver...
This paper describes an ultra-wideband (UWB) transmitter architecture for secure proximity communication. The transmitter achieves high security by utilizing a pseudorandom scrambling method for both frequency hopping in frequency domain and pulse position modulation (PPM) in time domain. In addition, the low transmitted power of −70dBm/MHz not only makes it difficult for other receivers to detect...
This paper presents a 6–8GHz 2Mb/s Chirp-UWB (C-UWB) transceiver implemented in 65nm CMOS. The transceiver performs burst-mode transmission with an optimum duty-cycle control by utilizing a steep digital gradient generation circuit in the transmitter. To enhance sensitivity and interference immunity, a slope detection based decision method is employed in the receiver by utilizing a 2-bit continuous-time...
This paper presents a dual-mode delta-sigma modulator. The modulator can be configured for two structures, 3rd-order 4-bit in low-frequency high-resolution applications, and 2nd-order 4-bit in high-frequency low-resolution applications. Most of the circuit parts including the capacitors and switches are shared in both modes. An efficient OTA and comparators with Input Offset Calibration technique...
This paper describes an energy efficient wideband FM transceiver system by introducing a chirp-UWB transmission with bulk pulse-position modulation (PPM). In contrast to conventional chirp modulated UWB transceivers that transmit only 1 bit in a pulse clock, the proposed position embedded transceiver manages to transmit 1.3 bit on average in one pulse clock period, improving spectral efficiency by...
A multi-mode reconfigurable wideband continuous-time lowpass/quadrature bandpass sigma-delta (CT LP/QBP ΣΔ) modulator employing power scaling technique (PST) for LTE-advanced/industry-specialized zero/low-IF receivers is presented. The proposed modulator consists of a loop filter with active-RC integrator configured as 3rd-order lowpass or 2nd-order complex bandpass architecture and 4-bit internal...
Ultra-wideband (UWB) technology has received great attention in recent short-range communication systems and been considered one of the potential candidates for upcoming IEEE 802.15.6 body area network (BAN) standard. High penetration capability and high precision ranging with a wide bandwidth of up to 7.5GHz (from 3.1GHz to 10.6GHz) make it easy to image the organs of human body for biomedical applications...
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