The Broncos signed defensive back Quentin Jammer on Wednesday after failing to land Charles Woodson as free-agent help at the position. Jammer spent his first 11 NFL seasons with the San Diego Chargers. Since becoming a full-time starter in 2003, he has missed only three starts, opening the most games (157) by an NFL cornerback during that time. A durable and physical defensive back, Jammer ranks fourth among active cornerbacks in tackles (710). Jammer was drafted by the Chargers in the first round of the 2002 NFL draft from Texas, where he played safety. Jammer has never been known for interceptions, but managed his first interception return for a touchdown against Peyton Manning and the Broncos in Week 6 last season. He intercepted three passes last season. His highest total was four in 2003 and 2006, and he has a total of 21 in his career. The Broncos had pursued Woodson, who instead wound up signing a richer deal with the Oakland Raiders last week.