Implementation of a maximum power point tracking system and an LDO regulator for interface circuits of solar energy harvesters for wireless sensor nodes

Huab, Marc Jefferson D.; Alarcón, Louis P.; Densing, Chris Vincent; Maestro, Rico Jossel M.; Rosales, Marc; Leon, Maria Theresa G. de

doi:10.1109/tencon.2017.8227862

Cited by 3 publications

(4 citation statements)

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“…It shows 0.8 μA under the SS corner at 80 °C , 0.49 μA under the TT corner at 80 °C and 0.2 μA under the FF corner at 80 °C . This confirms the CTAT characteristic as revealed in (10). Regarding the output voltage, VOUT(T), it is evaluated with different process corners, temperatures and loading currents.…”

Section: Resultssupporting

confidence: 80%

“…Figure 9a illustrates the variation of CTAT bias current I B (T) at different process corners (FF, TT, SS) at the operation temperatures, ranging from −20 • C to 80 • C. The I B (T) decreases with increasing temperatures across the operation temperature range. It shows 0.8 µA under the SS corner at 80 • C, 0.49 µA under the TT corner at 80 • C and 0.2 µA under the FF corner at 80 • C. This confirms the CTAT characteristic as revealed in(10). Regarding the output voltage, V OUT (T), it is evaluated with different process corners, temperatures and loading currents.…”

supporting

confidence: 75%

“…Besides, it is observed that VOUT(T) displays an increase at a high temperature of 85 °C under FF corner and little rise at TT corner, this is due to the decrease in IB(T), causing the circuit more sensitive to biasing parameters. (10). Regarding the output voltage, V OUT (T), it is evaluated with different process corners, temperatures and loading currents.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, low-power low-voltage performance becomes one of main agendas in sensor circuit design. The exemplary circuits are low-voltage, low dropout wireless sensor node [ 10 ] and low-power low-voltage biomedical sensor IC [ 11 ]. Based on the above discussed sensor applications, the Low Dropout (LDO) Regulator is regarded as the common building block used to produce a stable supply voltage to sustain the sensor circuit performance whilst providing adequate PSR as another important characteristic in sensor circuits and systems.…”

Section: Introductionmentioning

confidence: 99%

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A CMOS PSR Enhancer with 87.3 mV PVT-Insensitive Dropout Voltage for Sensor Circuits

Zhang

Chan

2021

Sensors

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A new power supply rejection (PSR) based enhancer with small and stable dropout voltage is presented in this work. It is implemented using TSMC-40 nm process technology and powered by 1.2 V supply voltage. A number of circuit techniques are proposed in this work. These include the temperature compensation for Level-Shifted Flipped Voltage Follower (LSFVF) and the Complementary-To-Absolute Temperature (CTAT) current reference. The typical output voltage and dropout voltage of the enhancer is 1.1127 V and 87.3 mV, respectively. The Monte-Carlo simulation of this output voltage yields a mean T.C. of 29.4 ppm/°C from −20 °C and 80 °C. Besides, the dropout voltage has been verified with good immunity against Process, Temperature and Process (PVT) variation through the worst-case simulation. Consuming only 4.75 μA, the circuit can drive load up to 500 μA to yield additional PSR improvement of 36 dB and 20 dB of PSR at 1 Hz and 1 MHz, respectively for the sensor circuit of interest. This is demonstrated through the application of an enhancer on the instrumentation Differential Difference Amplifier (DDA) for sensing floating bridge sensor signal. The comparative Monte-Carlo simulation results on a respective DDA circuit have revealed that the process sensitivity of output voltage of this work has achieved 14 times reduction in transient metrics with respect to that of the conventional counterpart over the operation temperature range in typical operation condition. Due to simplicity without voltage reference and operational amplifier(s), low power and small consumption of supply voltage headroom, the proposed work is very useful for supply noise sensitive analog or sensor circuit applications.

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Section: Resultssupporting

confidence: 80%

supporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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