US Patent 11659703 Integrated circuit with embedded high-density and high-current SRAM macros

A semiconductor structure includes a substrate and first SRAM cells and second SRAM cells. Each first SRAM cell includes two first p-type FinFET and four first n-type FinFET. Each first p-type and n-type FinFET includes a channel in a single semiconductor fin. The first SRAM cells are arranged with a first X-pitch and a first Y-pitch. Each second SRAM cell includes two second p-type FinFET and four second n-type FinFET. Each second p-type FinFET includes a channel in a single semiconductor fin. Each second n-type FinFET includes a channel in multiple semiconductor fins. The second SRAM cells are arranged with a second X-pitch and a second Y-pitch. The source/drain regions of the first p-type FinFET have a higher boron dopant concentration than the source/drain regions of the second p-type FinFET. A ratio of the second X-pitch to the first X-pitch is within a range of 1.1 to 1.5.