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A resistor ladder is an electrical circuit made from repeating units of resistors. Two configurations are discussed below, a string resistor ladder and an R–2R ladder. An R–2R Ladder is a simple and inexpensive way to perform digital-to-analog conversion, using repetitive arrangements of precise resistor networks in a ladder-like configuration. A string resistor ladder implements the non-repetitive reference network. ==String resistor ladder network (analog to digital conversion, or ADC)== A string of many, often equally dimensioned, resistors connected between two reference voltages is a resistor string ladder network. The resistors act as voltage dividers between the referenced voltages. Each tap of the string generates a different voltage, which can be compared with another ''voltage'': this is the basic principle of a flash ADC (analog-to-digital converter). Often a voltage is converted to a ''current'', enabling the possibility to use an R–2R ladder network. * Disadvantage: for an ''n''-bit ADC, the number of resistors grows exponentially, as resistors are required, while the R–2R resistor ladder only increases linearly with the number of bits, as it needs only resistors. * Advantage: higher impedance values can be reached using the same number of components. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Resistor ladder」の詳細全文を読む スポンサード リンク
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