Patent ID: 9252709
Filing Date: 2016-02-02
CPC Classification: H03B,H03L

Claim Text:
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 first comparison between a voltage of the capacitance circuit and a first reference voltage and a second comparison between the voltage of the capacitance circuit and a second reference voltage, the control circuit further configured to provide an oscillation signal responsive to the voltage of the capacitance circuit, the control circuit further configured to provide a reference current; wherein the reference current and at least one of the charging current or the discharging current are configured to be proportional to a difference between the first reference voltage and the second reference voltage, wherein the control circuit and the charging and/or discharging circuits form a current mirror configured to mirror the reference current as the respective charging current and/or discharging current.