公开(公告)号：US20200212895A1

公开(公告)日：2020-07-02

申请号：US16235291

申请日：2018-12-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： ERNST GEROG MUELLNER ,  TOBIAS FRITZ ,  BRADLEY KRAMER ,  SWAMINATHAN SANKARAN ,  BAHER HAROUN ,  RALF BREDERLOW

IPC: H03K3/03 ,  H03K3/014

Abstract: In described examples, a ring oscillator includes a series of N stages in a first ring. Each stage includes a respective output terminal coupled to a respective input terminal of a next one of the stages in the first ring. N is a positive odd-numbered integer of at least three. A series of N level shifters in a second ring are respectively connected to the N stages. Each level shifter receives a respective clock output from a respective output terminal of a stage to which it is connected and generates a respective boosted clock output in response thereto. The boosted clock output is coupled to control an impedance state of a next one of the level shifters in the second ring.