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模——数变换器(以下简称A/D变换)采用了专用的多斜率积分技术。这种技术与一般的三斜率技术类似,但有一个新奇额外的“前馈”脉冲。在三斜率技术中,信号经由一个多路开关送至积分器,加一段固定的“斜升”时间。然后转换多路开关,再加入一个负参考电压,该参考电压使电平斜降直到积分器放电到某个近于零值的电平为止。完成参考电压1斜降所用的时间可通过计数器计数这段期间的钟频1来记录。然后,断开参考电压1,接入与其同极
Analog-digital converter (hereinafter referred to as A / D conversion) uses a dedicated multi-slope integration technology. This technique is similar to the normal three-slope technique, but with a novel extra “feedforward” pulse. In triple-slope technology, the signal is sent to the integrator via a multiplexer plus a fixed “ramp-up” time. The multiplexer is then switched and a negative voltage reference is added, which ramps the level down until the integrator discharges to a level near zero. The time taken to complete ramp-down of reference voltage 1 can be recorded by counting the clock rate 1 during this period. Then, disconnect the reference voltage 1 and connect it with the same pole