E2V's EV10AQ190A sampling chip introduces a time-interleaved ADC architecture as a means of improving the sampling rate. Still, the non-ideality of the circuitry leads to the occurrence of timing mismatch among the sub-ADCs, which seriously affects the overall performance. To address this challenge, this study proposes a temporal mismatch error calibration scheme for the EV10AQ190A chip. The scheme incorporates statistical theory for mismatch estimation and a farrow-structured fractional-delay filter optimized by the Lagrange interpolation algorithm to construct an efficient and simple blind calibration system. Experiments verify the effectiveness of the system through simulation and actual sampling. The results show that the time-interleaved ADC's Spurious-Free Dynamic Range (SFDR) is improved by an average of 17.7474dB and the Effective Number of Bits (ENOB) is increased by an average of 2.3 bits after calibration.
KEYWORDS: Microcontrollers, Digital signal processing, LCDs, Signal processing, Signal detection, Power supplies, Digital electronics, Sensors, Filtering (signal processing), Capacitors
At present, vortex flowmeter still commonly exists two problems that the signal cannot be detected in the low flow rate so that the range ratio is limited, and high-power consumption cannot be applied to the harsh environment of the industrial site. With the design principles of low power consumption and integration, this paper designed a low-power vortex signal processing system based on the MSP430. The low-power operational amplifier TLV2254 is used to implement the preamplifier circuit to complete the charge/voltage conversion, amplification, filtering, shaping and other pre-processing of the signal output from the eddy street sensor. The low-cost and low-power-consumption MSP430F149 is selected as the control core for the signal acquisition and calculation circuit to complete the acquisition, analysis, and calculation of the signal, and control the LCD display of the calculation results. The software part mainly completes the acquisition of vortex signal, spectrum analysis, frequency calculation and display functions. In the laboratory flow test results show that the vortex flowmeter effectively extends the lower limit of the flow signal measurement, expand the range ratio at 5Hz, reduce power consumption makes the instrument work longer about 213 days in FFT mode. Through the combination of software and hardware design such as power supply monitoring, watchdog and software filtering, the anti-interference and safety of the system have also been greatly improved, which can be well applied to the field of industrial instrumentation.
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