| Resistor Ladder |
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| analog circuits | |
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A basic R-2R resistor ladder network is shown in Figure 1. The digital inputs or Bit s range from the most significant bit (MSB) to the least significant bit (LSB). The bits are switched between either 0V or VREF and depending on the state and location of the bits VOUT will vary between 0V and VREF. Because VREF is a digital signal, it is often +5V, as this is a logic 1. The MSB causes the greatest change in output Voltage and the LSB causes the smallest. The R-2R ladder is inexpensive and relatively easy to manufacture since only two resistor values are required. It is fast and has fixed output impedance R. The R-2R ladder operates as an array of voltage dividers whose output accuracy is solely dependent on how well each resistor is matched to the others. High performance R-2R networks may be printed directly onto a single substrate using a single film, making the resistors share similar Electrical characteristics, and may be Laser Trimmed to provide increased precision. EXTERNAL LINKS |
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