Patent ID: 8742815
Filing Date: 2014-06-03
Classification: H03K

Abstract:
1. An apparatus comprising: at least one delay element configured to receive a charging current and to provide a delay that is dependent on the charging current; a bias circuit configured to control generation of the charging current based on a function of at least one parameter of the at least one delay element to reduce variations in the delay of the at least one delay element with temperature; and wherein each of the at least one delay element comprises a first inverter coupled between a common node and circuit ground and configured to receive a non-inverting input signal and provide an inverting output signal; a second inverter coupled between the common node and circuit ground and configured to receive an inverting input signal and provide a non-inverting output signal, wherein the charging current is applied to the common node; and at least one capacitor coupled between outputs of the first and second inverters.