Design of a 0.18um Stable Non-Volatile Boost Circuit in High/Low Temperature Operation

In this work, we propose the P-MOS diode structure with triple-well process plus MIM capacitors, to establish two non-volatile boosters for flash memory products. Every connecting point in circuits, avoiding the occurrence of dielectric breakdown in gate oxide or p-n junction, was precisely conceived and examined. As the consideration of the system-on-chip (SoC), two stabilized-voltage circuits and two internal ring oscillators were built in. Additionally, to couple the voltage and to stabilize the voltage after several signal-transfer stages, obtaining the output voltage with DC 12V and DC20V, separately, as the input voltage is 3.3V, is necessary. The pumping time, while the high voltage is approached, is only several micro-seconds. The temperature effect with −25 ∼ 75°C range little impacts the booster voltages. The variation, due to temperature contribution, is less than 3%. By the way, this circuit design not only adopts the TSMC 0.18um process design kits, but includes some ESD protection circuits, in output terminals, to provide chip protection. It’s a full and efficient booster design with 0.18um CMOS process. The final dimension of this chip is around 705×978um².