| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a voltage follower available for a wider voltage range. <P>SOLUTION: The voltage follower includes a first field effect transistor (FET) MN1 whose gate forms an input of the voltage follower, and a second FET MN2 connected to its gate with a drain forming an output of the voltage follower. Sources of MN1 and MN2 are mutually connected and connected to a drain of a third FET MN3 which operates as a current source, and a predetermined bias voltage is applied to its gate. Further, the voltage follower utilizes a fourth FET MN4 whose source-drain path is formed as a circuit between the output of the voltage follower and the drain of the third FET MN3, and whose gate is connected to the gate of the third FET MN3. The voltage follower according to the invention includes the wider voltage range wherein the voltage follower is available, and may be used while being incorporated in an amplitude transit modulated ASK demodulator to be operated with a small supply voltage particularly. <P>COPYRIGHT: (C)2004,JPO |
