Period signal generation circuits

摘要

A period signal generation circuit including a control voltage generator and a period controller. The control voltage generator selecting one of temperature-dependent voltages to output the selected temperature-dependent voltage as a control voltage. The first and second temperature-dependent voltages varying according to a temperature and the third temperature-dependent voltage is constant regardless of variation of the temperature. The period controller configured to determine an amount of a current discharging from an internal node in response to the control voltage and outputs a periodic signal whose cycle time is determined according to a level of an internal signal induced at the internal node.

主权项

1. A period signal generation circuit, the circuit comprising:
a discharger configured to discharge charges of an internal node in response to a bias voltage; a reference voltage generator configured to select one of plurality of temperature-dependent voltages to output the selected temperature-dependent voltage as a reference voltage; a level detector configured to compare an internal signal induced at the internal node with the reference voltage to determine a logic level of a periodic signal; and a driver configured to drive the internal node in response to the periodic signal, wherein the plurality of temperature-dependent voltages comprise first to third temperature-dependent voltages, levels of the first and second temperature-dependent voltages vary according to a temperature and a level of the third temperature-dependent voltage is constant regardless of the temperature.