Patent · US Active

AC coupled clock receiver with common-mode noise rejection

US8693557B1 · kind B1 · utility

26Cited by
9References
17Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJul 2, 2009
Grant dateApr 8, 2014
Priority date
Expiry dateJan 7, 2033

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04L25/0292
  • WIPO fieldDigital communication
  • WIPO sectorElectrical engineering

Abstract

A clock receiver includes a capacitive coupling circuit for filtering out direct-current voltages from a differential clock signal. In this way, the capacitive coupling circuit rejects common-mode noise in the differential clock signal. The clock receiver also includes a bias circuit for establishing a bias voltage in the differential clock signal and a differential amplifier for amplifying the differential clock signal. Further, the differential amplifier generate a feedback differential clock signal and provides the feedback differential clock signal to the bias circuit for further rejecting common-mode noise in the differential clock signal. The feedback differential clock signal functions as a negative feedback signal for rejecting common-mode noise in the differential clock signal and as a positive feedback signal for amplifying the differential clock signal. In some embodiments, the clock receiver includes a capacitive coupling circuit with a cut-off frequency above the frequency of the differential clock signal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.