Patent ID: 6424184
Filing Date: 2002-07-23
Classification: G01R,G06F,Y02D

Abstract:
A frequency-voltage conversion circuit, comprising:an input pulse signal generation circuit for receiving a clock pulse signal having a frequency of a clock and generating an input pulse signal having a pulse width representing a target delay amount in accordance with the frequency of the clock, the input pulse signal being different from the clock pulse signal; a delay circuit for delaying the input pulse signal, the delay circuit outputting a pulse signal obtained by delaying the input pulse signal as an output pulse signal; and a delay amount-voltage conversion circuit for outputting a voltage corresponding to the target delay amount based on a delay amount of the output pulse signal with respect to the input pulse signal and supplying the voltage to the delay circuit; wherein the delay circuit controls the delay amount via delay control signals received from external terminals, in accordance with the voltage which is output from the delay amount-voltage conversion circuit, and the voltage output from the delay amount-voltage conversion circuit is such that the voltage substantially matches a minimum voltage required for external circuitry to be operable at the frequency of the clock.