Patent ID: 7972917

Claim:
A method for manufacturing a semiconductor device, comprising: (a) forming an element isolation insulation layer in a semiconductor substrate of a first conductivity type to isolate a laterally diffused metal oxide semiconductor (LDMOS) region, an offset drain metal oxide semiconductor (MOS) region, and a complementary metal oxide semiconductor (CMOS) region from one another; (b) forming a drain side offset insulation layer in the LDMOS region and the offset drain MOS region; (c) simultaneously forming a first well of a second conductivity type in the LDMOS region and the offset drain MOS region; (d) simultaneously forming a second well of the first conductivity type in the first well of the LDMOS region and the CMOS region; (e) forming the second well of the second conductivity type in the CMOS region; (f) forming an offset later of the first conductivity type under the drain side offset insulation layer of the offset drain MOS region; (g) forming in the second well of the first conductivity type of the LDMOS region a first impurity layer of the second conductivity type, the first impurity layer serving as a source; (h) forming in the first well of the second conductivity type of the LDMOS the first impurity layer of the second conductivity type, the first impurity layer serving as a drain; (i) forming in the second well of the first conductivity type of the CMOS region the first impurity layer of the second conductivity type, the first impurity layer serving as a source and a drain, wherein the steps (g), (h), and (i) are simultaneously conducted; (j) forming in the first well of the second conductivity type of the offset drain MOS region a second impurity layer of the first conductivity type, the second impurity layer serving as a source and a drain; and (k) forming in the second well of the second conductivity type of the CMOS region the second impurity layer of the first conductivity type, the second impurity layer serving as a source and drain, wherein steps (j) and (k) are simultaneously conducted, and wherein a depth of the first well is larger than a depth of the second well, and the second well is a retrograde well formed by a high energy ion implantation method.