Abstract: An apparatus includes a current source circuit having a first control input, a second control input, and an output. The current source circuit is configured to produce a current at the output at a first current level based on a first signal at the first control input being at a first logic level and at a second current level based on the first signal at the first control input being at a second logic level. The current source circuit is configured to produce the current at the output at a third current level based on a second signal at the second control input. A capacitor has a first terminal coupled to the output of the current source circuit and has a second terminal coupled to a voltage supply terminal. A buffer has a buffer input coupled to the first terminal and has a buffer output.

Abstract: Described examples include an integrated circuit having first and second transistors. The first transistor includes a plurality of trenches extending into a semiconductor substrate and a plurality of source regions, each source region located between a pair of adjacent trenches. A first source terminal is connected to the plurality of source regions. The second transistor includes a central source region between a pair of the trenches and a second source terminal connected to the central source region. The second source terminal is conductively isolated from the first source terminal.