Integrated circuit including a clock tree cell

摘要

A block (6, 8) comprises first and second oppositely doped semiconductor wells; contiguous standard cells; and a clock tree cell (30, 32) encircled by standard cells. The clock tree cell comprises a third semiconductor well having same doping type as the doping of the first well, second field-effect transistors in fully depleted silicon-on-insulator (FDSOI) technology, and a semiconductor strip extending continuously around the third well. The semiconductor strip has opposite doping type to the doping of the third well, so as to electrically isolate the third well from the first well. A block (6, 8) comprises first and second oppositely doped semiconductor wells; contiguous standard cells each comprising first field-effect transistors in FDSOI technology; and a clock tree cell (30, 32) encircled by standard cells, so that the clock tree (4) cell is contiguous with standard cells. The clock tree cell comprises a third semiconductor well having same doping type as the doping of the first well, second field-effect transistors in FDSOI technology, each ground plane of each second transistor being located above the third well in order to be electrically biased by way of this third well, and a semiconductor strip extending continuously around the third well. The semiconductor strip has opposite doping type to the doping of the third well, so as to electrically isolate the third well from the first well. An independent claim is included for method for using the integrated circuit.