Start-up circuit for current mirror circuits to facilitate transition from
a zero-current state to an operation state. The start-up circuit includes
two sets of current control devices. A set is coupled to each leg of the
current mirrored circuit to provide a bias on start-up. The current
control devices are coupled together to mirror the current that continues
during the operational state such that the start-up circuit in
combination with the operating circuit do not draw more current in the
operational state than the operating circuit would normally draw in the
operational state.