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    • 30. 发明授权
    • Digital-to-analog converter that compensates for integrated circuit
resistor variations
    • 用于补偿集成电路电阻变化的数模转换器
    • US4462021A
    • 1984-07-24
    • US347551
    • 1982-02-10
    • Kazuo WatanabeMasaru Sugita
    • Kazuo WatanabeMasaru Sugita
    • H03M1/76H03M1/00H03K13/02
    • H03M1/74
    • A D/A converter is comprised of a string of resistors coupled to a voltage source with respective junctions formed between adjacent resistors, including a reference junction substantially at the mid-point of the resistor string. Plural switches are coupled to the junctions and are selectively operable to couple a potential produced at a respective junction. A subtracting circuit has one input coupled in common to a first set of the switches and another input coupled in common to a second set of the switches to subtract the potential coupled from one set from the potential coupled from the other set so as to produce an output analog signal. A switch control circuit is responsive to a multi-bit digital signal for operating predetermined switches in both the first and second sets and thereby couple to the subtracting circuit the potentials which are produced at corresponding junctions on either side of the reference junction.
    • D / A转换器包括一组耦合到电压源的电阻器,其中相邻的电阻器之间形成相应的结,包括基本上在电阻器串的中点处的基准结。 多个开关耦合到结点并且可选择性地可操作以耦合在相应结处产生的电位。 减法电路具有一个共同连接到第一组开关的输入端,另一个输入端共同耦合到第二组开关,以减去从一组与从另一组耦合的电位耦合的电位,以产生一个 输出模拟信号。 开关控制电路响应于用于在第一和第二组中操作预定开关的多位数字信号,从而耦合到减法电路,在参考接点的任一侧上的相应接合处产生的电位。