Current-Steering Digital-to-Analog Converter With a High-PSRR Current Switch

Akita, Ippei; Itakura, Tetsuro; Shiraishi, Kenji

doi:10.1109/tcsii.2011.2168013

Cited by 9 publications

(5 citation statements)

References 10 publications

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“…It has the benefit of not necessarily requiring an output buffer for high performance. It directs all its current to the output, which means high efficiency can be achieved [74,2,29,28]. A simplified block diagram of a binary-weighted current-steering DAC with digital input signal as D…”

Section: Current-steering Dac For High-speed Operationmentioning

confidence: 99%

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Studies on Selected Topics in Radio Frequency Digital-to-Analog Converters

Sadeghifar

2019

Linköping Studies in Science and Technology. Dissertations

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The network latency in fifth generation mobile technology (5G) will be around one millisecond which is much lower than in 4G technology. This significantly faster response time together with higher information capacity and ultra-reliable communication in 5G technology will pave the way for future innovations in a smart and connected society. This new 5G network should be built on a reasonable wireless infrastructure and 5G radio base stations that can be vastly deployed. That is, while the electrical specification of a radio base station in 5G should be met in order to have the network functioning, the size, weight and power consumption of the radio system should be optimized to be able to commercially deploy these radios in a huge network. Last but not least I would like to especially thank my soulmate and my love Hoda. Without all your help, your devotion and patience, I would not be able to complete this work. Therefore, I dedicate this work to you.

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Section: Current-steering Dac For High-speed Operationmentioning

confidence: 99%

“…6.5, 6.3. DRFC Architecture three KVL equations can be written as: 2) and hence the differential output voltage as…”

Section: Output Stage Of the Rf Dac In Voltage-modementioning

confidence: 99%

Studies on Selected Topics in Radio Frequency Digital-to-Analog Converters

Sadeghifar

2019

Linköping Studies in Science and Technology. Dissertations

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“…The current-mode operation copes with the slew-rate problem of which other DAC architectures suffer. It directs almost all of its current to the output, which means high efficiency [15,18]. The block diagram of a binary weighted currentsteering DAC is shown in 2.3.…”

Section: Current-steering Digital-to-analog Convertersmentioning

confidence: 99%

On High-Speed Digital-to-Analog Converters and Semi-Digital FIR Filters

Sadeghifar¹

2015

Linköping Studies in Science and Technology. Thesis

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High-speed and high-resolution digital-to-analog converters (DACs) are vital components in all telecommunication systems. Radio-frequency digital-to-analog converter (RFDAC) provides high-speed and high-resolution conversion from digital domain to an analog signal. RFDACs can be employed in direct-conversion radio transmitter architectures. The idea of RFDAC is to utilize an oscillatorypulse-amplitude modulation instead of the conventional zero-order hold pulse amplitude modulation, which results in DAC output spectrum to have highenergy high-frequency lobe, other than the Nyquist main lobe. The frequency of the oscillatory pulse can be chosen, with respect to the sample frequency, such that the aliasing images of the signal at integer multiples of the sample frequency are landed in the high-energy high-frequency lobes of the DAC frequency response. Therefore the high-frequency images of the signal can be used as the output of the DAC, i.e., no need to the mixing stage for frequency upconversion after the DAC in the radio transmitter. The mixing stage however is not eliminated but it is rather moved into the DAC elements and therefore the local oscillator (LO) signal with high frequency should be delivered to each individual DAC element.In direct-conversion architecture of IQ modulators which utilize the RFDAC technique, however, there is a problem of finite image rejection. The origin of this problem is the different polarity of the spectral response of the oscillatorypulse-amplitude modulation in I and Q branches. The conditions where this problem can be alleviated in IQ modulator employing RFDACs is also discussed in this work.Σ∆ modulators are used preceding the DAC in the transmitter chain to reduce the digital signal's number of bits, still maintain the same resolution. By utilizing the Σ∆ modulator now the total number of DAC elements has decreased and therefore the delivery of the high-frequency LO signal to each DAC element is practical. One of the costs of employing Σ∆ modulator, however, is a higher quantization noise power at the output of the DAC. The quantization noise is ideally spectrally shaped to out-of-band frequencies by the Σ∆ modulator. The shaped noise which usually has comparatively high power must be filtered out to fulfill the radio transmission spectral mask requirement.Semi-digital FIR filter can be used in the context of digital-to-analog conversion, cascaded with Σ∆ modulator to filter the out-of-band noise by the modulator. In the same time it converts the signal from digital domain to an analog quantity. In general case, we can have a multi-bit, semi-digital FIR filter where each tap of the filter is realized with a sub-DAC of M bits. The delay elements are also realized with M-bit shift registers. If the output of the modulator is given by a single bit, the semi-digital FIR filter taps are simply controlled by a single switch assuming a current-steering architecture DAC. One of the major advantages is that the static linearity of the DAC is optimum. Since there are only t...

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“…For realizing wireless communication and power transmission to the implanted neural interface on the brain surface, several technologies that integrate passive components (e.g., an antenna on a flexible film) with high-performance active circuits have been studied [ 18 , 19 , 20 , 21 , 22 ]. In particular, many functional circuits including amplifiers, analog-to-digital converters, signal processors, and RF circuits are needed and they should all support low-power operation [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. Very thin film flexible transistors fabricated with organic or bio-resorbable materials can be used to fabricate monolithic film devices with passive and active components.…”

Section: Introductionmentioning

confidence: 99%

Co-Design Method and Wafer-Level Packaging Technique of Thin-Film Flexible Antenna and Silicon CMOS Rectifier Chips for Wireless-Powered Neural Interface Systems

Okabe

Jeewan

Yamagiwa

et al. 2015

Sensors

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In this paper, a co-design method and a wafer-level packaging technique of a flexible antenna and a CMOS rectifier chip for use in a small-sized implantable system on the brain surface are proposed. The proposed co-design method optimizes the system architecture, and can help avoid the use of external matching components, resulting in the realization of a small-size system. In addition, the technique employed to assemble a silicon large-scale integration (LSI) chip on the very thin parylene film (5 μm) enables the integration of the rectifier circuits and the flexible antenna (rectenna). In the demonstration of wireless power transmission (WPT), the fabricated flexible rectenna achieved a maximum efficiency of 0.497% with a distance of 3 cm between antennas. In addition, WPT with radio waves allows a misalignment of 185% against antenna size, implying that the misalignment has a less effect on the WPT characteristics compared with electromagnetic induction.

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Current-Steering Digital-to-Analog Converter With a High-PSRR Current Switch

Cited by 9 publications

References 10 publications

Studies on Selected Topics in Radio Frequency Digital-to-Analog Converters

Studies on Selected Topics in Radio Frequency Digital-to-Analog Converters

On High-Speed Digital-to-Analog Converters and Semi-Digital FIR Filters

Co-Design Method and Wafer-Level Packaging Technique of Thin-Film Flexible Antenna and Silicon CMOS Rectifier Chips for Wireless-Powered Neural Interface Systems

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