A 12 GHz 22 dB-Gain-Control SiGe Bipolar VGA With 2° Phase-Shift Variation

Padovan, Fabio; Tiebout, M.; Neviani, A.; Bevilacqua, Andrea

doi:10.1109/jssc.2016.2551749

Cited by 23 publications

(8 citation statements)

References 17 publications

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“…Since the proposed VCAT in this work is controlled by continuous analog voltage, the N is used for calculating the Figure‐Of‐Merit (FOM) of this work instead of 2 control_bits . The poor FOMs of the previous studies are mainly resulted by too small bandwidths and by large power consumption. Although excellent FOM is achieved by Sarkissian et al, the bandwidth is from 10 to 50 GHz, which makes it not suitable for the ultrasound applications.…”

Section: Resultsmentioning

confidence: 88%

“…The attenuation DR of the proposed VCAT in this work is larger than the others, and meanwhile, the attenuation gain can be tuned continuously while nearly all the others feature a digital controlled step attenuation characteristic except the one in the study of Padovan et al 28 However, no linearity-in-dB correction or improvement mechanism was adopted in their study,28 and the gain curve exhibits a logarithmic characteristic versus the current bias control, which implies a poor linearity-in-dB performance. In this work, the figure of merit is defined as 34,35 FIGURE 15 Measured S11 parameter at maximum and minimum attenuation gains at different frequencies and versus input control voltage at 3 MHz 29 22.0 (14-stages)…”

Section: Resultsmentioning

confidence: 99%

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A large dynamic range voltage controlled attenuator with improved linearity‐in‐dB for ultrasound applications

Fei

et al. 2019

Circuit Theory & Apps

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Summary A large dynamic range (DR) and high linearity‐in‐dB voltage controlled attenuator (VCAT) for ultrasound applications was presented. Continuous tunable VCAT implemented with Metal‐Oxide‐Semiconductor (MOS) transistors used as shunt devices was proposed in this work, and the linearity‐in‐dB performance was analyzed in detail. Nonlinearity of the shunt transistors operated in different regions resulted in poor linearity‐in‐dB attenuation of the VCAT, which was undesirable in an ultrasonic receiver system. An effective linearity‐in‐dB improvement scheme was then proposed. The full scale range of the input control voltage was divided into N intervals with a same equal‐length by uniformly distributed voltage values. At these division voltages, the attenuation gains were corrected to be the ideal ones by the tracing and comparing circuits. In this way, the non‐linearity‐in‐dB was limited to the intervals between the two adjacent corrected attenuation gains, and the overall linearity of the VCAT was improved greatly. Measurement results showed that the dynamic range of the proposed attenuator was 36‐dB, and the gain errors were in a range from −1.22 to −0.55 dB. The noise figures (NF) at the commonly used ultrasonic frequencies was below 6‐dB, and the S11 was better than −10 dB over the input range of the control voltage.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

A large dynamic range voltage controlled attenuator with improved linearity‐in‐dB for ultrasound applications

Fei

et al. 2019

Circuit Theory & Apps

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“…The current steering based on has the advantages of bandwidth and gain flatness. 9 However, there is a gain compression zone of about 14 dB near the highest gain for the proposed VGA, shown in Figure 4. The gain characteristic curve of the gain compression zone is not linear in dB, which severely limits the available gain and accuracy of the VGA.…”

Section: Vga Design Considerationmentioning

confidence: 92%

“…8 The particular input-output compensation circuitry reduces the phase shift sensitivity so that the low phase error dB-linear VGA can be achieved. 9 As such, the reported works present some merits, in most cases, a few of VGA specifications have been improved. Moreover, the dB-linear range is usually small, which is not acceptable in today's multiintegration and high-resolution applications.…”

Section: Introductionmentioning

confidence: 91%

A 6–18 GHz high dB‐linear attenuator based on variable gain amplifier for ultra‐wideband phased array systems

Wang

Wang³

et al. 2021

Micro & Optical Tech Letters

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The letter presents a high dB-linear attenuator based on variable gain amplifier (VGA) for ultra-wideband phased array systems. An effective dB-linear compensation structure is proposed to improve the gain range and accuracy. The bandwidth and gain flatness of the proposed VGA are increased by the emitter resistor-capacitor negative feedback and transistor segmentation technique. The proposed VGA is implemented with the 0.18 μm SiGe bipolar complementary metal oxide semiconductor (BiCMOS) process. The measured results show that the VGA can operate from 6 to 18 GHz with a controlled variable gain range of 20 dB, the root-mean-square gain error is less than 0.55 dB. The input 1 dB compression point (IP1dB) of the fabricated VGA is more than À5 dBm. The proposed VGA consumes 71 mW and occupies a chip area of 0.98 mm Â 0.98 mm.

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“…The insertion phase of VGA needs to remain unchanged ideally during gain adjustment. [2][3][4][5] However, the parasitic parameters and node impedance of the device are usually changed, resulting in phase variation across different gain states of VGA. Therefore, the research on the phase invariant technique has been widely reported in the field of VGA design.…”

Section: Introductionmentioning

confidence: 99%

A 148–170‐GHz 4‐bit variable gain amplifier with stagger‐tuning and multistage‐phase‐compensation techniques in 0.13‐μm SiGe

Yang

Zhang

Xie

et al. 2023

Micro & Optical Tech Letters

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This letter presents a 148–170‐GHz 4‐bit variable gain amplifier (VGA) with stagger‐tuning and multistage‐phase‐compensation techniques. In the design of this proposed VGA, phase variation is minimized by cascading overcompensation VGA and undercompensation VGA with reverse gain‐phase characteristics and phase suppression characteristics at sideband, achieved through different shunt inductors to ground. Additionally, stagger‐tuning technique has been introduced to realize VGA design. To prove these techniques, a 148–170‐GHz 4‐bit VGA has been fabricated in 0.13‐μm SiGe bipolar complementary metal‐oxide‐semiconductor (350/450 GHz ft/fmax) with a compact size of . The results show the VGA achieves phase variation and over 10‐dB tuning range with 0.6‐dB gain step for a wide operating frequency from 148 to 170 GHz. The RMS gain error is dB, the simulated input is dBm and the total power consumption is 32.4‐mW with 2.25 V supply voltage.

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A 12 GHz 22 dB-Gain-Control SiGe Bipolar VGA With 2° Phase-Shift Variation

Cited by 23 publications

References 17 publications

A large dynamic range voltage controlled attenuator with improved linearity‐in‐dB for ultrasound applications

A large dynamic range voltage controlled attenuator with improved linearity‐in‐dB for ultrasound applications

A 6–18 GHz high dB‐linear attenuator based on variable gain amplifier for ultra‐wideband phased array systems

A 148–170‐GHz 4‐bit variable gain amplifier with stagger‐tuning and multistage‐phase‐compensation techniques in 0.13‐μm SiGe

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