公开(公告)号：US11863145B1

公开(公告)日：2024-01-02

申请号：US17945600

申请日：2022-09-15

Applicant: Applied Optoelectronics, Inc.

Inventor： Rafael Celedon ,  Steven Blashewski ,  Mark Siejka ,  David Stewart ,  Stéphane Chapeau

IPC: H03G3/30 ,  H04B17/21 ,  H04B10/2575

CPC classification number: H03G3/3068 ,  H04B17/21 ,  H04B10/25751

Abstract: Automatic gain control (AGC) may be accomplished in a radio frequency (RF) amplifier in a hybrid fiber-coaxial (HFC) network using a wideband RF tuner to select multiple pilot channels (e.g., frequencies in lower and upper portions of an RF signals spectrum) for use in measuring power and determining a correction to be applied to the RF amplifier. The power of the pilot channel or channels may be measured, for example, using a received signal strength indicator (RSSI) from the wideband RF tuner or using a power detector circuit. Using the wideband RF tuner allows selectable gain and/or tilt control across a wideband spectrum, such as a channel spectrum of a CATV downstream RF signal, to maintain stable RF output levels of the amplifier as RF input levels vary. The RF amplifier may be a line extender amplifier used in a CATV HFC network to amplify a wideband RF spectrum of up to 1.8 GHz.