4MHz Internal Oscillator - Ultra Low Power (1µA@4MHz@1V) LFoundry (SMIC) 0.15 um

This macro-cell is a general purpose, ultra low power internal oscillator core designed for LFoundry 0.15µm LF150 CMOS technology STD (Standard) and LP (Low Power) process. The circuit has internal level shifting and start-up circuits. A 4-bit digital bus allows frequency calibration against process variations. It also includes an internal current bias. The core is easily retargeted to any other CMOS technology due to its MOSFET-only oscillator architecture.