Before revision: The heavily doped layer acts as a current sink where excess minority carriers can quickly recombine.Stephen A. Campbell, The Science and Engineering of Microelectronic Fabrication, Oxford University Press (Indian Edition 2007) p.461 ISBN 978-0-19-568144-4 Another possibility for a latch-up prevention is the Latch-up Protection Technology circuit.
After revision: The heavily doped layer acts as a current sink where excess minority carriers can quickly recombine.Stephen A. Campbell, The Science and Engineering of Microelectronic Fabrication, Oxford University Press (Indian Edition 2007) p.461 ISBN 978-0-19-568144-4 A possibility for a latch-up mitigation is the Latch-up Protection Technology circuit.