The 28-year-old defender revealed his one-season deal came two years after he almost put pen to paper for the Seasiders.
The former Ger's decision to sign up for the Championship promotion chasers was sealed after boss Ian Holloway made a big impression on Broadfoot who left Gers by mutual consent last week.
He said: "The manager attracted me here. I almost signed a couple of seasons ago but I stayed with Rangers.
"People couldn't have spoken highly enough of the club, so I think it was a good choice for me.
"I've been in for a couple of days at the training ground and all the boys seem tight-knit. Obviously I already know a few boys, having played with Barry Ferguson at Rangers and a couple of the Scots before. So I'm delighted to be here, it's a new chapter and one I'm looking forward to."
Broadfoot also believes his versatility – he can play either in central defence or at full-back – can be a plus in his bid to relaunch himself with the Lancashire outfit and also help him realise his dream of playing in the English Premiership.
He said: "I'm just hoping to add a bit of experience, but obviously it depends where the manager wants me to play.
"The plan is to get into the Premier League, but it's not going to be easy.
"They came close to getting back there last season. I watched the play-offs last year and they were unfortunate with the play-off final."