摘要 |
A frequency sensing NMOS voltage regulator is disclosed. A NMOS source follower transistor has a gate connected to a predetermined gate voltage, a drain coupled to an external supply voltage through a PMOS switching transistor, and a source connected to a load. The gate of the PMOS transistor is controlled by a delay circuit through which a pulse derived from the system clock is passed. Through the use of the delay circuit and the PMOS transistor, the amount of current produced by the NMOS transistor is made a function of the cycle rate of the system clock and the current provided by the NMOS transistor tracks the frequency-dependent current requirements of the load, resulting in a reduced variance of the supply voltage Vcc over a wide current range.
|