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    • 5. 发明授权
    • Reduced cost pointing stick circuit
    • 降低成本指标棒电路
    • US5870078A
    • 1999-02-09
    • US623075
    • 1996-03-28
    • Robert Stephen Olyha, Jr.Joseph Dela Rutledge
    • Robert Stephen Olyha, Jr.Joseph Dela Rutledge
    • G06F3/038H03M1/56G09G5/08
    • G06F3/0383
    • A low-cost circuit processes, with high precision, the output signals of a pointing stick used for controlling a cursor on a computer display screen. A two-stage method of high precision moderate range analog-to-digital (A/D) conversion is combined with a known method of A/D conversion by sweeping a reference voltage across the range of the voltage to be measured at a known rate and noting the time of coincidence. Operational amplifiers of moderate quality are used in an open-loop mode, so that the operational amplifier inputs are high impedance. In order to get sufficient isolation from power supply noise and variations, the analog circuitry is isolated from the supply voltage while measurements are being made. To avoid interference from the digital switching transients of the microprocessor with the analog comparator switching time, the microprocessor is placed in idle mode, thereby removing its internal clock drive signals (and associated transients) from all of the microprocessor's internal circuitry except the timer which is being used to make the measurement. The resulting circuitry is capable of detecting a very small signal in noise spikes many times larger.
    • 低成本电路以高精度处理用于在计算机显示屏上控制光标的指示杆的输出信号。 高精度中等范围模数(A / D)转换的两级方法与A / D转换的已知方法组合,通过以已知速率扫描待测电压范围的参考电压 并注意到巧合的时间。 中等质量的运算放大器用于开环模式,因此运算放大器输入为高阻抗。 为了充分隔离电源噪声和变化,模拟电路在进行测量时与电源电压隔离。 为了避免模拟比较器切换时间对微处理器的数字切换瞬变的干扰,微处理器处于空闲模式,从而从除微处理器内部的定时器之外的所有微处理器的内部电路中除去其内部时钟驱动信号(和相关瞬变) 用于进行测量。 所得到的电路能够检测到噪声尖峰中的非常小的信号多倍。