Adaptive on-chip oscillator for FPGA based synchronous designs

A single inverter ring oscillator (SIRO) implementation in field programmable gate arrays (FPGAs), serving the purpose of on-chip oscillator driving co-existing clocked circuits is presented. The property of SIRO to adapt to the FPGA technology by automatic frequency adjustment always ensures optimal performance of synchronous circuit. Externally clocked circuits upon FPGA technology variation require a change in oscillating source for optimal performance, whereas SIRO-based on-chip oscillator provides platform independence, without power overhead. In addition, a clocked circuit driven by the on-chip oscillator has greater electromagnetic compatibility (EMC), as compared to the externally clocked one.