| 摘要 |
<p>This invention discloses a switching constant current source circuit including a first current path (12, 18) for supplying a constant current, a first MOS transistor (15), one end of a current path of which is connected to the first current path (12, 18), the other end of the current path of which is connected to a second current path (Idmy, GND), and a gate of which is applied with a digital signal (Cod) corresponding to a logical amplitude, a second MOS transistor (14), one end of a current path of which is connected to the first current path (12, 18), the other end of the current path of which is connected to a third current path (14, Iout), and which performs a switching operation complementary with the first MOS transistor (15), and level conversion means (11, 12, 16) for fetching a change in voltage in the first current path (12, 18) caused by a change in current flowing through the first current path (12, 18) according to an operation of the first MOS transistor (15) in response to the digital signal, and alternately applying a first level for disabling the second MOS transistor (14), which operates complementarily with the first MOS transistor (15), and a second level for enabling the second MOS transistor (14) to output a predetermined current. <IMAGE></p> |
