The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
300-GHz band is promising for wireless communication since wide frequency band and low atmospheric attenuation are available. In this presentation, the technologies of a recently-developed 300-GHz-band transceiver chip set including 105Gbps transmitter and 32Gbps receiver are discussed using CMOS integrated circuits.
We demonstrate wavelength locking of a silicon ring modulator across 480pm laser wavelength drift using a drop-port OMA monitoring CMOS circuit and a dithering-based feedback loop at a settling speed of up to 380pm/s.
We review a silicon photonics platform that integrates low-loss passive components with high-speed modulators and photodetectors operating at 50Gb/s from CMOS compatible voltages.
A low complexity high speed generalised space shift keying (GSSK) visible light communication (VLC) link is investigated. A 2 × 2 Gallium Nitride (GaN) micro-LED array is used as transmitter and a complementary metal-oxide-semiconductor (CMOS) avalanche photo-diode (APD) array working as receiver. A bit error ratio (BER) of 2 × 10−4 up to a data rate of 320 Mbits/s is achieved which allows for error-free...
This paper presents an implementation of a binary pulse-position modulator (2-PPM) for impulse-radio ultra-wideband (IR-UWB) systems, capable of producing an appropriate signal to drive the final output stage of an ultra narrow pulse generator. Compared to the usual circuits based on voltage-controlled delay lines, this novel scheme uses digital signal processing of the clock and data signals with...
We have investigated CMOS photonics based on heterogeneous integration of SiGe/Ge and III–V semiconductors on Si, which gives us opportunities to enhance functionalities of Si photonics through their superior material properties for electronic-photonics integrated circuits.
Consider the structure of a self-oscillation power amplifier as a power line driver. Self-oscillation power amplifier was improved by the Class-D power amplifier. The traditional Class-D switching power amplifier is vulnerable to distortion limitation. Due to the non-linear continuous time nature of the self-oscillation, it possesses peculiar properties that enable the construction of a highly linear,...
This paper presents a 96.6-dB-peak-SNDR and 50-kHz-bandwidth switched-capacitor delta-sigma modulator for ADC operating at 1.8 V and consuming 7.9 mW. This performance is achieved by the introduction of Class-AB single-stage switched variable-mirror amplifiers (VMAs) combined with an optimized architecture and a 5-phase switched-capacitor scheme. The resulting 1.8-mm2 delta-sigma modulator is integrated...
5G poses severe challenges to PA design. In the first place, output power and efficiency are of prime importance because of battery lifetime. The tradeoff between linear output power and efficiency is typically challenged by the high PAPR due to QAM modulation and/or OFDM techniques. But this important trade-off is challenged even more in 5G due to the high bandwidth requirements. Furthermore, the...
This paper proposed an oscillator-based ultrasonic sensor interface that can be applied to intravascular applications. The readout circuits are validated with a capacitive micromachined ultrasonic transducer (CMUT) and a current-to-frequency chip. The CMOS CMUTs are integrated with a current amplifier on the same chip and the current-to-frequency chip provides the current-to-frequency readout interface...
ΔΣM performance can be improved by using MASH or SMASH structures to obtain higher-order noise shaping [1]. They have better stability than single-loop structures. The power dissipation of ΔΣMs can be reduced by using simpler amplifiers such as single-stage or inverter-based amplifiers [2]. Selecting a passive or active-passive ΔΣM architecture, where the processing gain of comparator is used in the...
This paper presents a Digital Doherty Power Amplifier (DDPA) with high back-off efficiency. The main and peaking amplifiers are implemented in 180 nm CMOS SOI as Digital Power Amplifiers (DPAs) with 10 bit amplitude control. The Doherty combiner is implemented using external matching components on a PCB, with lumped elements synthesized to provide equivalent characteristics of impedance inverter and...
Continuous-time delta-sigma modulators (CT-DSMs) are well suited for the baseband ADC of an LTE-A receiver. To boost user throughput and increase network capacity, CT-DSMs will need to increase signal bandwidth (BW) while maintaining sufficient dynamic range (DR) and good power efficiency. For example, 5 downlink component carriers are no longer sufficient to meet the ITU requirement for IMT-advanced...
Technology advancement has recently made it attractive to replace the flash quantizer (QTZ) in a multibit ΔΣ modulator by an asynchronous successive-approximation-register (ASAR) QTZ to improve the overall power efficiency [1]. However, limited by the SAR throughput, most works in this regime report only a small signal bandwidth. To achieve a wide bandwidth, a lower oversampling ratio (OSR) can be...
This paper presents the ongoing research efforts in optical communication transceiver SoC design for emerging fiber-wireless mobile networks and next generation 200/400GbE optical networks using advanced CMOS technologies. First, a 4-Gb/s fiber-to-mm-wave baseband-over-fiber (BoF) modulator SoC using 65-nm CMOS with a fully integrated 850-nm wavelength optical receiver front-end for short-range wireless...
This paper presents three different low-power CMOS transceivers (TRx) for ZigBee, RFID and BLE designed at USTC. These TRx are compatible with three different IEEE standards. Firstly a highly integrated low-power 2.4GHz TRx with a low-IF receiver for IEEE 802.15.4 WPAN is briefed. Next, the TRx for Bluetooth Low Energy BLE 4.0 in standard 130nm CMOS is presented. Then, a low power UHF RFID Reader...
This paper presents a CMOS power amplifier (PA) based on a dynamic supply switching technique for long-term evolution (LTE) applications. The PA integrated circuit includes a supply modulator which consists of two DC-DC converters and a switching circuit for dynamic supply switching (DSS) operation. The supply modulator dynamically supplies either low-or high DC voltage to the drain of the PA. To...
This paper presents the design of a 120GHz, 28nm CMOS direct conversion transmitter. The transmitter architecture is based on a wideband baseband capable of supporting BPSK, QPSK and 16QAM modulations, DAC-mixer, LO feeding network with hybrid 90° to support IQ modulation and a PA stage. The transmitter measured output power is −1dBm. The PA simulated OP1dB is 1dBm and the saturation power is 6dBm...
We propose a low-power and compact 25-Gb/s differential CMOS modulator driver. To achieve low power consumption, we employ an output driver with a high-gain single-stage amplifier and a gainless pre-driver with an equalizer function. In the pre-driver, we use area-efficient 3D inductors for the inductor peaking technique to obtain the equalizer function with compactness. We also employ a cascode amplifier...
We demonstrate efficient photonic devices that rely on sub-100nm features in unmodified 45nm SOI CMOS, including photonic crystals, array-antenna grating couplers, and modulators. We then show monolithically integrated electronic-photonic systems comprising millions of transistors and thousands of photonic devices, including a complete chip-to-chip photonic link.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.