| 摘要 |
In a multiple-output digital to analog converter, digital input data (Dd) is converted into a plurality of analog output voltages (Voi) across associated loads (Li). A timing generator (TG) generates time periods (Til) in dependence on the digital input data (Dd). A buffer (B1) has an output (O1) to supply a waveform (Wf1) to the loads (Li) via a coupling circuit (Sli). The coupling circuit (Sli) couples a certain load (Li) to the buffer output (B1) during an associated time period (Til). The output voltage (Voi) across the certain load (Li) is related to a value of the waveform (Wfl) at the end of the associated time period (Til) when the coupling circuit decouples the load (Li) from the buffer output (O1). The multiple-output digital to analog converter further comprises a plurality of dummy loads (Ldi), each one of the dummy loads (Ldi) is associated to a corresponding one of the loads (Li). The dummy loads (Ldi) are coupled to the buffer output (O1) when the corresponding load (Ldi) is decoupled from the buffer output (O1). A pre-setting circuit (B2, S2i) generates the voltages (Vdi) across the dummy loads (Ldi) so as to be substantially equal to the output voltages (Voi) across the associated loads (Li) occurring when the coupling circuit (Sli) decouples the load (Li) from the output buffer (B1). |
