| 摘要 |
A Delta-Sigma DAC and a digital to analog conversion method are provided. A FIR filter receives a shaped digital signal to generate a first current on a first output node, and a second current on a second output node. A current inverter is coupled to the second output node, outputting a reversed current having opposite polarity and identical magnitude of the second current. A current to voltage converter is coupled to the first output node and the output of current inverter, generating an analog signal according to the first and reversed currents. A first current source compensates DC offset for the first current, and a second current source compensates DC offset for the second current. The first and second current sources are implemented by NMOS.
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