Device for producing refresh signal for semiconducting memory device memory cell produces capacitor charging current proportional to difference between temperature dependent and independent currents

摘要

The device has a capacitor, a differential current source for providing a capacitor charging current with temperature dependent and temperature independent current sources connected together so the current level of the capacitor charging current is proportional to the difference between the temperature dependent and temperature independent currents. A comparator outputs a refresh signal if the capacitor voltage exceeds a reference voltage. The device has a capacitor (C), a differential current source (14) for providing a capacitor charging current for charging the capacitor with temperature dependent and temperature independent current sources that are connected together so that the current level of the capacitor charging current is proportional to the difference between the temperature dependent and temperature independent currents. A comparator (12) outputs a refresh signal if the capacitor voltage (VC) exceeds a reference voltage (VREF). AN Independent claim is also included for the following: an arrangement for implementing the inventive method of producing a refresh signal for a memory cell of a semiconducting memory device, preferably a DRAM memory.