| 摘要 |
When a pair of emitter-coupled transistor switches 22A and 22B are switched over, the D flipflop 26A shifts the base potential of a transistor buffer circuit 24 to reduce a potential fluctuation at a constant current source 21, reducing a current oscillation caused by the transient response of the constant current source 21 in which feedback control is performed by a comparator 214. In another construction, a potential oscillation waveform of the connected emitter node is stored in a RAM and the waveform read out of the RAM is added to the base of the transistor buffer circuit to reduce the current oscillation.
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