Norhamizah Idros, Alia Rosli, Zulfiqar Ali Abdul Aziz, Jagadheswaran Rajendran and Arjuna Marzuki
The purpose of this paper is to present the performance of an 8-bit hybrid DAC which is suitable for wireless application or part of a built-in test block for ADC. The hybrid…
Abstract
Purpose
The purpose of this paper is to present the performance of an 8-bit hybrid DAC which is suitable for wireless application or part of a built-in test block for ADC. The hybrid architecture used is the combination of thermometer coding and binary-weighted resistor architectures.
Design/methodology/approach
The conventional DAC topology performance tends to degrade at high-resolution applications. A hybrid topology, which combines an equal number of bits of thermometer coding and binary-weighted resistor architectures operating at higher sampling frequency, was proposed in this work. The die was fabricated in 180 nm CMOS process technology with a supplied voltage of 1.8 V.
Findings
Measured results showed that the DNL and INL errors are within −1 to +1 LSB and −0.9 to +0.9 LSB, respectively for the input range of 0.9 V at the clock rate of 200 MHz, and this DAC was proven monotonic. This 0.068 mm2 DAC consumed 12.6 mW for the data conversion.
Originality/value
This paper is of value in showing the equal division of bits from thermometer coding and binary-weighted resistor architectures provides smaller die size and enhances the performance of hybrid DAC, in terms of linearity, which are DNL and INL errors and guarantees monotonicity at higher sampling frequency.
Details
Keywords
Amiza Rasmi, Arjuna Marzuki, Mohd Nizam Osman, Ahmad Ismat Abdul Rahim, Mohamed Razman Yahya and Abdul Fatah Awang Mat
The purpose of this paper is to discuss medium‐power amplifier (MPA) design using parasitic‐aware core‐based approach.
Abstract
Purpose
The purpose of this paper is to discuss medium‐power amplifier (MPA) design using parasitic‐aware core‐based approach.
Design/methodology/approach
This paper discusses a core‐based design approach, which can also deliver multi‐band radio frequency integrated circuit.
Findings
A fabricated 3.5 GHz MPA achieved a P1dB of 16.81 dBm, power‐added efficiency (PAE) of 16.74 percent and gain of 6.81 dB at the 10 dBm of input power under a low‐power supply of 3 V. The maximum current, Imax is 80.7 mA and the power consumption of the device is 242.10 mW. A fabricated 2.4 GHz MPA achieved a P1dB of 14.83 dBm, PAE of 11.73 percent and gain of 9.83 dB at the 5.0 dBm of input power under a low‐power supply of 3.0 V. The maximum current, Imax is 84.4 mA and the power consumption for this device is 253.20 mW.
Originality/value
This paper shows the merits of the parasitic‐aware design methods used in designing the core circuit.
Details
Keywords
Siti Maisurah Mohd Hassan, Yusman M. Yusof, Arjuna Marzuki, Nazif Emran Farid, Siti Amalina Enche Ab Rahim and Mohd Hafis M. Ali
The purpose of this paper is to present the high-frequency performance of 0.13-μm n-type metal-oxide-semiconductor (NMOS) transistors with various multi-finger configurations for…
Abstract
Purpose
The purpose of this paper is to present the high-frequency performance of 0.13-μm n-type metal-oxide-semiconductor (NMOS) transistors with various multi-finger configurations for implementation in millimeter-wave (mm-wave) frequency.
Design/methodology/approach
A folded-like double-gate transistor layout is designed to enable the transistor to work in the mm-wave region. Different sizes of transistors with variation in finger width (WF) and number of fingers (NF) were fabricated to determine the optimum size of the transistor. The extrinsic parasitic elements of selected transistors were extracted and investigated. The radio frequency (RF) performance of these samples were then analyzed and compared.
Findings
The proposed layout performed well with the highest maximum oscillation frequency (fmax) achieved at 122 GHz. Based on the comparison done, the optimum WF obtained for the layout is at 2.0 μm. It is found that the extrinsic parasitic capacitance is more dominant than the parasitic resistance in affecting the fmax. In s-parameter analysis, it is observed that the transistor with the least NF has smaller variance in small-signal gain throughout the measurement frequency. The maximum stable gain for the samples is also found to be roughly similar and independent of NF.
Originality/value
A new layout structure for an NMOS transistor that works in mm-wave frequency is proposed. Experimental analyses presented here cover for both NF and WF, unlike others which focus on either NF or WF only.
Details
Keywords
Supawat Meeprom, Pongphan Sathatip and Chichaya Leruksa
This study aims to examine the impact of customer experience of cannabis-infused food and beverage perception (sensory experience, novelty experience, health concerns and…
Abstract
Purpose
This study aims to examine the impact of customer experience of cannabis-infused food and beverage perception (sensory experience, novelty experience, health concerns and restaurant experience) on favouring these products and subsequent customer citizenship behaviour.
Design/methodology/approach
Using a purposive sampling approach, an onsite survey was administered to Thai Gen Z customers in consuming cannabis-infused foods and/or beverages. Subsequently, the sample consisted of 330 respondents. Partial least squares structural equation modelling was used for the analyses.
Findings
The results indicated that sensory experience, health concerns and restaurant experience had significant positive effects on favouring cannabis-infused foods and beverages. This favourability, in turn, positively affected customer citizenship behaviour. In addition, favouring cannabis-infused foods and beverages partially mediated the relationships between customer citizenship behaviour and sensory experience, health concerns and restaurant experience.
Originality/value
This study provides a new contribution to the literature with a first empirical examination showing positive favouring of cannabis-infused foods and beverages among young consumers in Thailand. It provides practical insights for managers in emerging markets to leverage cannabis-infused products as part of the enhancement of the global food and beverage industry. The study also offers an example of how to move forward through an unknown territory regarding perceptions of consumer experiences.