Author:
Li Yunyun,Zhang Yiming,Zhang Chenhao,Wang Xuhong
Abstract
Abstract
High temperature fluxgate sensor is one of the main sensors in rotary steering logging, which can obtain bit dip information by measuring geomagnetic direction. The use of Digital Analog Converter (DAC) to achieve a closed loop of the fluxgate can effectively improve the measurement accuracy, but the existing DAC chip cannot work in a high temperature environment underground. In order to solve this problem, a design scheme of PWM DAC is proposed. According to the performance index of DAC and the requirements of fluxgate application scenarios, the design points of PWM DAC are discussed, and the circuit implementation scheme is given. Secondly, based on the scheme, a 10 bit PWM DAC with 1 ms adjustment time and 0.5 LSB maximum output ripple is designed, which has passed the simulation and physical verification.
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