Differential common base TIA with 56 dB Ohm gain and 45 GHz bandwidth in 130 nm SiGe

Giannakopoulos, Stavros; He, Zhongxia Simon; Darwazeh, Izzat; Zirath, Herbert

doi:10.1109/apmc.2017.8251649

Cited by 9 publications

(3 citation statements)

References 8 publications

(5 reference statements)

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“…Hence, a TIA with low input resistance reduces the time constant and significantly increases the receiver bandwidth. Circuits with low input resistance, such as the common base (CB) [3,4] and the regulated cascode (RGC) TIAs [5], originally proposed for earlier generations of optical fibre communication systems, are more recently found to be highly attractive for use in VLC systems [6][7][8][9]. For example, our recent work in [6] reports a specially designed modified RGC TIA for largearea photodiodes, achieving a bandwidth of 200 MHz at 2 kΩ with an equivalent C pd of 300 pF.…”

Section: Introductionmentioning

confidence: 99%

Equivalent Circuit Model for Large-Area Photodiodes for VLC Systems

Kassem

Darwazeh

2022

2022 13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)

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An equivalent circuit model for large-area PIN photodiodes used in visible light communication (VLC) applications is described. The modelling aims to gain insight into the effect of the photodiode intrinsic elements on the bandwidth of VLC receivers. The model parameters are extracted based on impedance measurements of two commercially available large-area PIN photodiodes. The extracted model parameters identify the photodiode series resistance as a major contributor to the bandwidth limitation of VLC receivers, especially when employing low input impedance transimpedance amplifiers (TIAs). However, such resistance is commonly ignored by most circuit designers, since it is assumed to have a negligible effect on the TIA performance. To demonstrate the accuracy of the photodiode equivalent circuit model, a design example of a low input impedance regulated cascode (RGC) TIA is described. The TIA is constructed using discrete components and a printed circuit board (PCB). The designed RGC TIA is measured using the proposed photodiode equivalent model versus a simplified model. In addition, a VLC link is constructed to measure the optoelectrical response of the large-area photodiode with the RGC TIA. The RGC frequency response measurements obtained from the full and simplified photodiode equivalent model are contrasted to the optoelectrical response, which verified that, unlike the simplified photodiode model, the proposed photodiode equivalent model can accurately predict the bandwidth performance of the VLC receiver.

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Section: Introductionmentioning

confidence: 99%

Equivalent Circuit Model for Large-Area Photodiodes for VLC Systems

Kassem

Darwazeh

2022

2022 13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)

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“…The eventual benefit of such a low noise TIA is the possibility of widening the bandwidth for higher data rate applications. Traditionally, the low noise TIA were implemented in SiGe HBT [1], CMOS [2], InP DHBT [3] with SiGe HBT based TIA reaching up to 5.5 𝑝𝐴 √𝐻𝑧 ⁄ of input referred noise. This is the state-of-the-art in these technologies for TIA circuits.…”

Section: Introductionmentioning

confidence: 99%

A Wideband Ultra-Low Current Noise Transimpedance Amplifier for Ultrafast Wideband THz Communication

Shivan

Hossain

Doerner

et al. 2022

2022 24th International Microwave and Radar Conference (MIKON)

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This work reports a wideband transimpedance amplifier MMIC with ultra-low input referred noise current. Being based on transferred substrate InP DHBT process, this work achieves a significant leap forward for ultra-low noise transimpedance amplifier design particularly in HBT based processes, in which, low noise characteristic is fundamentally challenging to achieve. Using a low bias current for amplification, the noise current is kept low. As a result, the amplification is achieved without compromising the noise current performance of the circuit. A 3-dB bandwidth from DC to 10 GHz was achieved with a transimpedance gain of beyond 50 dBΩ with a measured input referred noise current density of 3 𝒑𝑨 √𝑯𝒛 ⁄ . To the authors best knowledge, this is the lowest reported input-referred noise current density for InP DHBT based TIA, covering such wide bandwidth.

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“…However, in the vast majority of reports, the designs involve photodiode capacitances (c pd ) of typically just a few picoFarads (pF), which is particularly low in comparison to the values encountered in visible light communication (VLC) systems. Designs have been reported that utilise key bandwidth extension techniques, such as low input impedance amplifiers featuring common base (CB) [2,4,5] or regulated cascode (RGC) [6,7] configurations. Different realisations of the RGC have been reported, with some featuring additional bandwidth optimisation techniques such as inductive [8] and capacitive peaking [9].…”

Section: Introductionmentioning

confidence: 99%

A High Bandwidth Modified Regulated Cascode TIA for High Capacitance Photodiodes in VLC

Kassem

Darwazeh

2019

2019 IEEE International Symposium on Circuits and Systems (ISCAS)

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This paper proposes, for the first time, a modification of the conventional regulated cascode (RGC) amplifier which improves its tolerance to ultra-high photodiode capacitances. In conventional RGCs, there is a Miller capacitance introduced by the base-collector capacitance of the common base stage, limiting bandwidth gain and potentially result in amplifier instability. Here, we eliminate these undesirable characteristics by introducing an additional cascode stage that nullifies the Miller capacitance. We show that exceptional improvements in bandwidth can be made, which is important in the context of visible light communications systems, where using large-area (large capacitance) photodiodes is desirable.

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Differential common base TIA with 56 dB Ohm gain and 45 GHz bandwidth in 130 nm SiGe

Cited by 9 publications

References 8 publications

Equivalent Circuit Model for Large-Area Photodiodes for VLC Systems

Equivalent Circuit Model for Large-Area Photodiodes for VLC Systems

A Wideband Ultra-Low Current Noise Transimpedance Amplifier for Ultrafast Wideband THz Communication

A High Bandwidth Modified Regulated Cascode TIA for High Capacitance Photodiodes in VLC

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