Patent ID: 8283956
Filing Date: 2012-10-09
Classification: H03L

Abstract:
1. A radiation-hardened charge pump circuit, comprising: a first charge pump that includes a first charge pump output; a second charge pump that includes a second charge pump output; a first coincidence detector that receives as inputs the first charge pump output and the second charge pump output and produces as an output a first coincidence signal based on comparing the first charge pump output to the second charge pump output to determine whether the first and second charge pump outputs are in a defined coincidence band of one another, wherein the first coincidence signal indicates whether a single event upset (SEU) has occurred at one or more of the first charge pump and the second charge pump; an analog 2:1 multiplexor for selecting either the first charge pump output or the second charge pump output based on the first coincidence signal; and a third charge pump that includes a third charge pump output; a second coincidence detector that receives as inputs the second charge pump output and the third charge pump output and produces as an output a second coincidence signal; and decision logic that receives as inputs the first coincidence signal and the second coincidence signal and produces as an output a select signal based on the first coincidence signal and the second coincidence signal, wherein the analog 2:1 multiplexor selects either the first charge pump output or the second charge pump output based on the select signal.