High-PSRR Wide-Range Supply-Independent CMOS Voltage Reference for Retinal Prosthetic Systems

Zawawi, Ruhaifi Bin Abdullah; Choi, Hojong; Kim, Jungsuk

doi:10.3390/electronics9122028

Cited by 10 publications

(10 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The proposed reference circuit was designed using a standard SK-Hynix 0.35 µm CMOS standard process. The current paper extends our previous work in [15]. Our previous work focused on a positive reference only, which was used in LDO to generate a positive supply voltage.…”

Section: Introductionmentioning

confidence: 63%

High PSRR Wide Supply Range Dual-Voltage Reference Circuit for Bio-Implantable Applications

Zawawi¹,

Choi

Kim

2021

Electronics

Self Cite

View full text Add to dashboard Cite

On-chip systems are challenging owing to the limited size of the components, such as the capacitor bank in the rectifier. With a small on-chip capacitor, the output voltage of the rectifier might ring if the circuit experiences significant changes in current. The reference circuit is the first block after the rectifier, and the entire system relies on its robustness. A fully integrated dual-voltage reference circuit for bio-implantable applications is presented. The proposed circuit utilizes nonlinear current compensation techniques that significantly decrease supply variations and reject high-supply ripples for various frequencies. The reference circuit was verified using a 0.35 µm complementary metal-oxide semiconductor (CMOS) process. Maximum PSRR values of −112 dB and −128 dB were obtained. With a supply range from 2.8 to 12 V, the proposed design achieves 0.916 and 1.5 mV/V line regulation for the positive and negative reference circuits, respectively.

show abstract

Section: Introductionmentioning

confidence: 63%

High PSRR Wide Supply Range Dual-Voltage Reference Circuit for Bio-Implantable Applications

Zawawi¹,

Choi

Kim

2021

Electronics

Self Cite

View full text Add to dashboard Cite

show abstract

“…The wider the bandwidth at the −6 dB point, the lower the Q factor, and thus, more image data can be realized [ 69 ]. However, the harmonic component generated unwanted image data [ 70 , 71 ]. Thus, these data need to be minimized.…”

Section: Methodsmentioning

confidence: 99%

Novel Bandwidth Expander Supported Power Amplifier for Wideband Ultrasound Transducer Devices

Kim

Choi

2021

Sensors

Self Cite

View full text Add to dashboard Cite

Ultrasound transducer devices have their own frequency ranges, depending on the applications and specifications, due to penetration depth, sensitivity, and image resolution. For imaging applications, in particular, the transducer devices are preferable to have a wide bandwidth due to the specific information generated by the tissue or blood vessel structures. To support these ultrasound transducer devices, ultrasound power amplifier hardware with a wide bandwidth can improve the transducer performance. Therefore, we developed a new bandwidth expander circuit using specially designed switching architectures to increase the power amplifier bandwidth. The measured bandwidth of the power amplifier with the help of the bandwidth expander circuit increased by 56.9%. In addition, the measured echo bandwidths of the 15-, 20-, and 25-MHz transducer devices were increased by 8.1%, 6.0%, and 9.8%, respectively, with the help of the designed bandwidth expander circuit. Therefore, the designed architecture could help an ultrasound system hardware with a wider bandwidth, thus supporting the use of different frequency ultrasound transducer devices with a single developed ultrasound system.

show abstract

“…Therefore, the limiters need to block the unwanted high voltage signals from the transmitter to protect the receiver. Computer is used to control the excitation pulses and receiving echoes through the transmitter and receiver [33,34].…”

Section: Ultrasound System Structurementioning

confidence: 99%

Novel dual-resistor-diode limiter circuit structures for high-voltage reliable ultrasound receiver systems

Choi¹

2022

THC

Self Cite

View full text Add to dashboard Cite

BACKGROUND: The limiters have been used to protect the ultrasound receivers because of the inherent characteristic of the transducers which are required to use the high voltage excitation to obtain the reasonable echo signal amplitudes. OBJECTIVE: Among the variety of the limiters, the performances of discharge voltage degradation from the limiters gradually deteriorate the whole ultrasound systems according to the applied voltages of the ultrasonic transducers. This could cause the ultrasound systems to be unreliable for the long-term operations, resulting in possibly breaking the receiver systems. METHODS: Designed limiters were evaluated with insertion loss, total harmonic distortion, and pulse-echo responses with the ultrasound transducer devices. RESULTS: Designed new dual-resistor-diode limiters exhibited greater and faster suppression of the pulse width (1.15 V and 6.1 μs) for high-voltage signals. CONCLUSIONS: Our proposed dual-resistor-diode limiter could be one of the potential candidates for reliable ultrasound receiver system.

show abstract

High-PSRR Wide-Range Supply-Independent CMOS Voltage Reference for Retinal Prosthetic Systems

Cited by 10 publications

References 16 publications

High PSRR Wide Supply Range Dual-Voltage Reference Circuit for Bio-Implantable Applications

High PSRR Wide Supply Range Dual-Voltage Reference Circuit for Bio-Implantable Applications

Novel Bandwidth Expander Supported Power Amplifier for Wideband Ultrasound Transducer Devices

Novel dual-resistor-diode limiter circuit structures for high-voltage reliable ultrasound receiver systems

Contact Info

Product

Resources

About