APPARATUSES AND METHODS FOR PROVIDING OSCILLATION SIGNALS

摘要

Apparatuses and methods are disclosed for oscillators that are substantially insensitive to supply voltage variations. In one such example apparatus, a capacitance circuit is configured to be charged and discharged. Charging and discharging circuits are coupled to the capacitance circuit and configured to charge and discharge, respectively, the capacitance circuit by charging and discharging currents responsive to charge and discharge signals. A control circuit is coupled to the charging circuit and the discharging circuit, and is configured to provide the charge and discharge signals responsive to a voltage of the capacitance circuit, and is further configured to provide an oscillation signal responsive to the voltage of the capacitance circuit. The charging current, the discharging current, or both the charging and discharging currents are proportional to a difference between a first reference voltage and a second reference voltage.

主权项

1. An apparatus, comprising:
a capacitance circuit configured to be charged and discharged; a charging circuit coupled to the capacitance circuit and configured to charge the capacitance circuit by a charging current responsive to a charge signal; a discharging circuit coupled to the capacitance circuit and configured to discharge the capacitance circuit by a discharging current responsive to a discharge signal; and a control circuit coupled to the charging circuit and the discharging circuit, the control circuit configured to provide the charge and discharge signals responsive to a voltage of the capacitance circuit, and further configured to provide an oscillation signal responsive to the voltage of the capacitance circuit; wherein the charging current, the discharging current, or both the charging and discharging currents are configured to be proportional to a difference between a first reference voltage and a second reference voltage.