| 摘要 |
PROBLEM TO BE SOLVED: To provide a digital-to-analog converter that consumes less power and prevents signal distortion and SNR deterioration caused by relative dispersion of elements. SOLUTION: The digital-to-analog converter includes a 1-bit register 103, a switch circuit 104, a two terminal pair impedance element 105, an operational amplifier 108, an impedance element 106, and an impedance element 107. In the switch circuit 104, a 1-bit digitalΔΣsignal and the output signal of the 1-bit register 103 are used as a pair of input signals, and a pair of output signals are output. In the two terminal pair impedance element 105, the pair of output signals are input, and noise is removed, and a first output signal and a second output signal are output. The operational amplifier 108 has an inverting input terminal 108a, a non-inverting input terminal 108b, and an output terminal 108c. The impedance element 106 is connected between the inverting input terminal 108a and the output terminal 108c. One end of the impedance element 107 is connected to the non-inverting input terminal 108b, and reference voltage is applied to the other end of the impedance element 107. COPYRIGHT: (C)2011,JPO&INPIT |
