Detecting transitions in circuits during periodic detection windows

Analytical circuitry for analysing a circuit and determining preferred operating conditions of said circuit comprising:

• transition detection circuitry for detecting during multiple clock cycles, transitions occurring within a detection period in each of said multiple clock cycles at a plurality of nodes within said circuit, said transition detection circuitry comprising:
• a clock signal generator for generating a detection clock signal from a clock signal clocking a sampling element within said circuit, said detection clock signal defining said detection period;
• a plurality of transition detectors for detecting transitions at respective ones of said plurality of nodes during said detection period, each of said plurality of transition detectors being clocked by said detection clock signal;
• combining circuitry for combining said detected transitions output by said plurality of transition detectors to generate a composite transition detection signal;
• said analytical circuitry further comprising:
• control circuitry for controlling at least one of said operational voltage of said circuit and said clock frequency clocking said sampling element;
• and
• analysing circuitry for analysing said composite transition detection signals output and for determining a preferred value for at least one of said operational voltage and said clock frequency.