On-chip temperature sensor and oscillator for reduced self-refresh current for dynamic random access memory

摘要

A temperature dependent clock circuit (100) is disclosed. The clock circuit (100) includes a reference circuit (102) that provides a first group of reference signals (108) with positive temperature coefficients and a second group of reference signals (110) with negative temperature coefficients. A sample circuit (104) compares the first group of signals (108) with a second group of signals (110) and provides a group of bias signals (112) representative of the operating temperature of the clock circuit (100). A frequency controllable oscillator circuit (106) provides an output clock signal (CLK) having a frequency that is dependent upon the values of the bias signals (112).