Explain the working of R/2R ladder DAC

Subject: Liner Integrated Circuits

Topic: Analog to Digital and Digital to Analog Convertors

Difficulty: Medium

1 Answer

R/2R ladder DAC

R/2R ladder is an alternative to the binary weighted input DAC, which uses fewer unique resistor values thus does not require precision resistors.

  • A disadvantage of the former DAC design was its requirement of several different precise input resistor values: one unique value per binary input bit.
  • Its advantage comparing to the binary weighted is it only has two values of resistors.
  • Easily scalable to any desired number of bits
  • Output impedance is equal to R, regardless of the number of bits, simplifying filtering and further analog signal processing circuit design


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