Claims
- 1. An apparatus comprising:a high voltage MOS transistor on a substrate; and a low voltage NMOS transistor and a low voltage PMOS transistor, wherein the high voltage MOS transistor is produced on the substrate in the same CMOS process as the low voltage transistors, wherein the threshold voltage of the low voltage NMOS transistor and the high voltage MOS transistor are the same, and wherein the high voltage MOS transistor is symmetrical around a drain region of the high voltage MOS transistor.
- 2. The apparatus of claim 1, wherein the high voltage MOS transistor forms an analog line driver and the low voltage transistors form a portion of an analog-to-digital and digital-to-analog (AD/DA) converter.
- 3. The apparatus of claim 1, wherein the low voltage transistors and the high voltage MOS transistor have the same gate material and underlying gate oxide.
- 4. The apparatus of claim 1, wherein the high voltage MOS transistor and the low voltage transistors have similar frequency characteristics.
- 5. An apparatus comprising:an analog line driver including a high voltage MOS transistor; and an analog-to-digital and digital-to-analog (AD/DA) converter including a low voltage NMOS transistor and a low voltage PMOS transistor, wherein the high voltage MOS transistor and the low voltage transistors are formed on a same substrate in a same CMOS process, and wherein the high voltage MOS transistor is symmetrical around a drain region of the high voltage MOS transistor.
- 6. The apparatus of claim 5, wherein the low voltage transistors and the high voltage MOS transistor have the same gate material and underlying gate oxide.
- 7. The apparatus of claim 5, wherein the high voltage MOS transistor and the low voltage transistors have similar frequency characteristics.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9901345 |
Apr 1999 |
SE |
|
Parent Case Info
This application is a continuation divisional of application Ser. No. 09/549,948, filed on Apr. 14, 2000.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4628341 |
Thomas |
Dec 1986 |
A |
4701796 |
Kamiya |
Oct 1987 |
A |
Non-Patent Literature Citations (1)
Entry |
S. Wolf, “Silicon Processing for the VLSI Era, vol. 2 -Process Integration”, ISBN 0-961672-4-5, Lattice Press California 1990, pp. 17-44. |