| 摘要 |
PURPOSE: A digital to analog converter circuit is provided to reduce the entire area of a digital to analog converter by reducing the number of resistance of a divider and the number of switches. CONSTITUTION: A resistance cell distributes voltage by each resistance divider. 2 bit 2-to-4 decoder groups(521,523a,523b,525a,525b) output voltage which corresponds by processing digital data divided in the resistance cell. Capacitor groups(531,533,535) are applied voltages(V1-V5) which are outputted from the 2 bit 2-to-4 decoder groups and execute electric charge by a charge subtraction method. The capacitor groups transfer electric charge by a charge transfer interpolation method. An operational amplifier(540) generates output voltage by receiving interpolation voltage corresponding to charge quantity which is transmitted from reference voltage and the capacitor group.
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