eldo_user

Examples
Tutorial—High Impedance Fault Detection of a PLL Circuit
Observe the impedance of the charge pump output (in green). It goes into high
impedance state only when the charge pump input ports (UP in blue and DOWN in
yellow) are equal to zero.
The circuit schematic for the charge pump (highlighted in yellow) is shown below:
When UP=DOWN=0, both transistors M2R and M1R are turned OFF and therefore
their common node INVCO goes into high impedance state. This is the expected
behavior.
Eldo® User's Manual, 15.3 1365