US Patent 7236061 Temperature compensated refresh clock circuit for memory circuits

A memory circuit that generates a positive temperature correlated clock frequency is described. One embodiment includes a voltage reference having a voltage determined at least in part by a diode or transistor having a negative temperature coefficient. A clock generator generates a clock having a frequency that is based at least in part on the voltage reference voltage so that the clock frequency has a positive temperature correlation. A memory charge pump is enabled at least in part by the clock.