METHOD TO DETERMINE HEAT JUNCTION-TO-CASE RESISTANCE OF DIGITAL INTEGRATED MICROCIRCUITS Russian patent published in 2015 - IPC G01R31/28 

FIELD: measurement equipment.

SUBSTANCE: odd number (n>1) of logical elements of a controlled microcircuit are connected according to a ring generator circuit. Closing the ring generator feedback circuit for a certain time of a measurement cycle, they switch on the mode of high frequency pulse generation, which results in microcircuit heating. The heat sensitive parameter measured is repetition frequency of the ring generator at the beginning f_beg and in the end f_end of the measurement cycle. Average current consumed by the microcircuit from a source of power supply is measured. The heat junction-to-case resistance is determined using the following formula: $$R_{\text{Hj-c}}=\frac{\Delta f}{I_{av}^{con}\cdot E_{pow}\cdot K_f},$$ where Δf=f_beg-f_end - variation of repetition frequency of ring generator pulses; $$I_{av}^{con}$$ - average current consumed by the controlled microcircuit during measurement cycle time; E_pow - microcircuit power supply voltage, K_f - temperature coefficient of repetition frequency of ring generator pulses.

EFFECT: reduced measurement error.

2 dwg