| 摘要 |
The present invention discloses a stepped signal generating circuit for producing stepped signals having nearly perfect sinusoidal stepped signals. The stepped signal generating circuit comprises a plurality of current mirror switching sections, each having a P type and an N type current mirror for outputting constant currents upon receiving digital signals. N-MOS transistors are provided to pass or block the output current of each switching section. The constant currents outputted from the switching sections are then controlled by a constant voltage of the constant voltage source. The final output is controlled by a constant current of a constant current source before being outputted. Accordingly, the present invention generates precise and nearly sinusoidal stepped signals.
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