Design of Differential Variable-Gain Transimpedance Amplifier in 0.18 µm SiGe BiCMOS

Lee, Samuel B.S.; Liu, Hang; Yeo, Kiat Seng; Chen, Jer‐Ming; Yu, Xiaopeng

doi:10.3390/electronics9071058

Cited by 6 publications

(13 citation statements)

References 19 publications

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“…The design of a 48 GHz phase-locked loop for 60 GHz transceivers [ 31 ] is presented in the Special Issue on mmWave integrated circuits and systems for 5G applications [ 32 ]. This Special Issue also covers other design aspects of mmWave transceivers, including bandpass filter design [ 33 ], variable gain amplifiers [ 34 , 35 ], and mixers [ 36 ].…”

Section: Background Theory and Modelingmentioning

confidence: 99%

MmWave Physical Layer Network Modeling and Planning for Fixed Wireless Access Applications

Beelde

Vantorre

Castellanos

et al. 2023

Sensors

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The large bandwidths that are available at millimeter-wave frequencies enable fixed wireless access (FWA) applications, in which fixed point-to-point wireless links are used to provide internet connectivity. In FWA networks, a wireless mesh is created and data are routed from the customer premises equipment (CPE) towards the point of presence (POP), which is the interface with the wired internet infrastructure. The performance of the wireless links depends on the radio propagation characteristics, as well as the wireless technology that is used. The radio propagation characteristics depend on the environment and on the considered frequency. In this work, we analyzed the network characteristics of FWA networks using radio propagation models for different wireless technologies using millimeter-wave (mmWave) frequencies of 28 GHz, 60 GHz, and 140 GHz. Different scenarios and environments were considered, and the influence of rain, vegetation, and the number of subscribers was investigated. A network planning algorithm is presented that defines a route for each CPE towards the POP based on a predefined location of customer devices and considering the available capacity of the wireless links. Rain does not have a considerable effect on the system capacity. Even though the higher frequencies exhibit a larger path loss, resulting in a lower power of the received signal, the larger bandwidths enable a higher channel capacity.

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Section: Background Theory and Modelingmentioning

confidence: 99%

MmWave Physical Layer Network Modeling and Planning for Fixed Wireless Access Applications

Beelde

Vantorre

Castellanos

et al. 2023

Sensors

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“…Thus, the key TIA trade-off is between transimpedance gain Z T and bandwidth [6]. Many TIA designs counter it by reducing the input impedance Z in [6][7][8]. Thus, this paper's objective is the design of a TIA which is the most crucial compo nent for a VLC system, which is expected to become common.…”

Section: Introductionmentioning

confidence: 99%

“…Thus the key TIA trade-off is between transimpedance gain 𝑍 and bandwidth [6]. Many TIA designs counter it by reducing the input impedance 𝑍 [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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A 4 GHz Single-to-Differential Cross-Coupled Variable-Gain Transimpedance Amplifier for Optical Communication

Lee

Yeo

2021

Electronics

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This letter presents an inductorless transimpedance amplifier (TIA) for visible light communication, using the UMC 40 nm CMOS process. It consists of a single-to-differential input stage with a modified cross-coupled regulated cascode design, followed by a modified fT-doubler mid-stage with a combined active inductor and capacitive degeneration design for bandwidth-enhancement and differential output. The mid-stage also has an attached common-mode feedback (CMFB) circuit. Both the input and mid-stages have gain-varying and peaking-varying functions. It has a measured gain range of 37.5–58.7 dBΩ and 4.15 GHz bandwidth using a 0.5 pF capacitive load. The gain range results in an input dynamic range of 33.2 µA–1.46 mA. Its input referred noise current is 10.7 pA/Hz, core DC power consumption is 7.84 mW from a VDDTIA of 1.6 V and core area is 39 µm × 26 µm.

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“…Finally, in Table V, we can see the results obtained for the third experimental setup, where a transimpedance amplifier (TIA) based on the operational amplifier chip LT1028 is added. TIA is useful to increase the current output of the devices to a usable voltage [28]. This chip block separates the voltage of the operational amplifier in the output and thus provides a small value of the impedance to the photodiode.…”

mentioning

confidence: 99%

Improvements of Organic Photodetectors for VLC Using a New Active Layer, Focal Lens, and a Transimpedance Amplifier

Corral

Rodríguez-Mas

Scals

et al. 2022

ELEKTRON ELEKTROTECH

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Beyond 5G networks, and for short distance but high-speed communication systems, there is an incipient growing interest in visible light communications (VLC). Furthermore, it is an interesting alternative within the framework of the Internet of Things (IoT). However, there is a problem on the part of the receiver in these systems, motivated by the non-existence of photovoltaic elements used particularly for this purpose. Because of their simplicity and small investment, organic-type photodetectors have a high capacity for use in VLC systems. With a structure of polymers represented by an organic photodetector fabricated with poly (3-hexylthiophene) (P3HT) and a bulk heterojunction active layer of phenyl-C61-butyric acid methyl ester (PCBM) and commercial LEDs, we show our system in this paper. The main novelty of this work is in reception. With different upgrade using a new active layer or adding a focal lens or inserting a transimpedance amplifier, we have achieved improved performance results related to voltage and distance, with an increase of more than 40 %, and Bit Error Rate (BER) by modifying the active layer concentration with respect to results obtained in a former work. Also, we have tested the use of a transimpedance amplifier to obtain the best results in distances of 12 cm to 20 cm and a focal lens with the same objective of improving the BER in critical environments, where the Signal-to-Noise Ratio (SNR) is close to zero. To conclude, these modifications show that it is possible to increase the main parameters of our system to be useful in VLC systems.

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Design of Differential Variable-Gain Transimpedance Amplifier in 0.18 µm SiGe BiCMOS

Cited by 6 publications

References 19 publications

MmWave Physical Layer Network Modeling and Planning for Fixed Wireless Access Applications

MmWave Physical Layer Network Modeling and Planning for Fixed Wireless Access Applications

A 4 GHz Single-to-Differential Cross-Coupled Variable-Gain Transimpedance Amplifier for Optical Communication

Improvements of Organic Photodetectors for VLC Using a New Active Layer, Focal Lens, and a Transimpedance Amplifier

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