| 摘要 |
PURPOSE:To secure the isolation, by providing an insulating transformer between a chopper circuit and a sample-and-holding circuit. CONSTITUTION:Analog output voltage of a digital-to-analog converter 1 becomes square wave AC voltage by which analog voltage is made an envelope, by a chopper circuit 5, and is inputted to the primary side of an insulating transformer 6. An output of the secondary side of the insulating transformer 6 is sample-held by a sample- and-holding circuit 7. Timing signals T of the chopper circuit and the sample-and- holding circuit are synchronized, and also, said output is sample-held after output voltage of the secondary side of the insulating transformer has been stabilized sufficiently. |
