This paper describes a ring oscillator based low jitter charge pump PLL with supply regulation and digital calibration. In order to combat power supply noise, a low drop output voltage regulator is implemented. The VC...This paper describes a ring oscillator based low jitter charge pump PLL with supply regulation and digital calibration. In order to combat power supply noise, a low drop output voltage regulator is implemented. The VCO gain is tunable by using the 4 bit control self-calibration technique. So that the optimal VCO gain is automatically selected and the process/temperature variation is compensated. Fabricated in the 0.13 μm CMOS process, the PLL achieves a frequency range of 100--400 MHz and occupies a 190 × 200 μm2 area. The measured RMS jitter is 5.36 ps at a 400 MHz operating frequency.展开更多
This paper reports a complimentary metal-oxide-semiconductor （CMOS） analog front-end chip for amperometric electrochemical sensors. The chip includes a digital configuration circuit, which can communicate with an ex...This paper reports a complimentary metal-oxide-semiconductor （CMOS） analog front-end chip for amperometric electrochemical sensors. The chip includes a digital configuration circuit, which can communicate with an external microcontroller by employing an I^2C interface bus, and thus is highly programmable. Digital correlative double samples technique and an incremental sigma-delta analog to digital converter （∑-△ ADC） are employed to achieve a new proposed system architecture with double samples. The chip has been fabricated in a standard 0.18-μm CMOS process with high-precision and high-linearity performance occupying an area of 1.3 × 1.9 mm^2. Sample solutions with various phosphate concentrations have been detected with a step concentration of 0.01 mg/L.展开更多
This paper presents a low noise complimentary metal-oxide-semiconductor（CMOS） detection chip for amperometric electrochemical sensors.In order to effectively remove the input offset of the cascaded integrators and t...This paper presents a low noise complimentary metal-oxide-semiconductor（CMOS） detection chip for amperometric electrochemical sensors.In order to effectively remove the input offset of the cascaded integrators and the low frequency noise in the modulator,a novel offset cancellation chopping scheme was proposed in the Incremental AS analog to digital converter（IADC）.A novel low power potentiostat was employed in this chip to provide the biasing voltage for the sensor while mirroring the sensor current out for detection.The chip communicates with FPGA through standard built in I2 C interface and SPI bus.Fabricated in 0.18-μm CMOS process,this chip detects current signal with high accuracy and high linearity.A prototype microsystem was produced to verify the detection chip performance with current input as well as micro-sensors.展开更多
基金supported by the National Key Basic Research and Development Program of China(No.2015CB352100)
文摘This paper describes a ring oscillator based low jitter charge pump PLL with supply regulation and digital calibration. In order to combat power supply noise, a low drop output voltage regulator is implemented. The VCO gain is tunable by using the 4 bit control self-calibration technique. So that the optimal VCO gain is automatically selected and the process/temperature variation is compensated. Fabricated in the 0.13 μm CMOS process, the PLL achieves a frequency range of 100--400 MHz and occupies a 190 × 200 μm2 area. The measured RMS jitter is 5.36 ps at a 400 MHz operating frequency.
基金Project supported by the National Key Basic Research and Development Project(No.2015CB352103)
文摘This paper reports a complimentary metal-oxide-semiconductor （CMOS） analog front-end chip for amperometric electrochemical sensors. The chip includes a digital configuration circuit, which can communicate with an external microcontroller by employing an I^2C interface bus, and thus is highly programmable. Digital correlative double samples technique and an incremental sigma-delta analog to digital converter （∑-△ ADC） are employed to achieve a new proposed system architecture with double samples. The chip has been fabricated in a standard 0.18-μm CMOS process with high-precision and high-linearity performance occupying an area of 1.3 × 1.9 mm^2. Sample solutions with various phosphate concentrations have been detected with a step concentration of 0.01 mg/L.
基金supported by the State Key Development Program for Basic Research of China(No.2015CB352100)
文摘This paper presents a low noise complimentary metal-oxide-semiconductor（CMOS） detection chip for amperometric electrochemical sensors.In order to effectively remove the input offset of the cascaded integrators and the low frequency noise in the modulator,a novel offset cancellation chopping scheme was proposed in the Incremental AS analog to digital converter（IADC）.A novel low power potentiostat was employed in this chip to provide the biasing voltage for the sensor while mirroring the sensor current out for detection.The chip communicates with FPGA through standard built in I2 C interface and SPI bus.Fabricated in 0.18-μm CMOS process,this chip detects current signal with high accuracy and high linearity.A prototype microsystem was produced to verify the detection chip performance with current input as well as micro-sensors.
