| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a low distortion and high S/N ratio D/A converter.SOLUTION: During a first period, each input segment unit (IU1m (m=1-N)) outputs current signals depending on input digital data (Dm), and terminals (Iout+, Iout-) are connected to an inverting input terminal and a non-inverting input terminal of a differential operational amplifier (100) and the terminals (Iout+, Iout-) are disconnected from each other to produce differential analog signals that are the sums of the current signals output from each input segment unit. During a second period, the current signal outputs are stopped, the terminals (Iout+, Iout-) are disconnected from the inverting input terminal and non-inverting input terminal of the differential operational amplifier (100) and the terminals (Iout+, Iout-) are connected to each other, so that capacitive elements (Cfb1, Cfb2) connected between a non-inverting output terminal and the inverting input terminal and between an inverting output terminal and the non-inverting input terminal of the differential operational amplifier (100) hold signal values of the differential analog signals at the same values as in the first period.</p> |
