AAP


A man who strapped a hoax collar bomb around the neck of a teenage girl in Sydney will be sentenced on Tuesday.


Paul Douglas Peters, 52, will learn his fate in the District Court in Sydney when he is sentenced over what has been described in court as "an act of urban terrorism".


Peters pleaded guilty to aggravated breaking and entering and detaining with advantage over the incident on August 3 last year.


He entered the Pulver family home at Mosman, on Sydney's lower north shore, armed with an aluminium baseball bat and the fake bomb, which he attached around teenager Madeleine Pulver's neck after cornering her in her bedroom.


A document attached to the fake device demanded an unspecified sum of money and said tampering with it would cause it to explode.


The incident sparked a 10-hour police operation before the device was confirmed as a hoax.


Peters has been in custody since he was arrested in the US a few weeks later and extradited to NSW.


During sentence hearings, the judge was told Peters had no memory of attaching the collar bomb and now believed his actions were "bizarre and stupid".


A forensic psychiatrist said he suffered from "major depression" in the months before the incident and had taken on the role of a character in a book he was writing.


But Crown prosecutor Margaret Cunneen, SC, said Peters got the wrong house when he targeted Ms Pulver and then lied about not being able to remember the incident.


She submitted he meant to target a neighbour of the Pulvers after he suffered financial losses and described is as "an act of urban terrorism".


Judge Peter Zahra will sentence Peters on Tuesday.