Automatic gain control and offset correction
AssigneeLevel One Communications, Inc.
InventorDonald E. MacNally
Life of this patent
Estimating the term…
Abstract
A direct conversion type transceiver system incorporates an offset correction and automatic gain control system. The automatic gain control system includes an amplifier amplifying a baseband signal which is directly converted from a received incoming RF signal, a feedback offset canceller controllably canceling DC offset, an automatic gain controller controlling gain of the amplifier, and a feed forward offset canceller coupled to a signal peak detector. The signal peak detector controlling the automatic gain controller and the feed forward offset canceller simultaneously, the feed forward offset canceller further canceling the DC offset.
Claims13
A method of incorporating an offset correction and automatic gain control system into a direct conversion type of transceiver in a communication system, comprising:
- receiving an incoming signal having a DC content;
- converting the incoming signal to a baseband signal;
- amplifying the baseband signal;
- and
- canceling DC offset and controlling gain of the amplified signal within a preamble period, wherein the DC content of an incoming signal envelop is subtracted from an instantaneous incoming signal plus the DC offset thereby resulting in the incoming signal without the DC offset, the instantaneous incoming signal retaining its necessary DC content while undesired offset is cancelled.
An automatic gain control and offset correction system, comprising:
- an amplifier amplifying a baseband signal which is directly converted from a received incoming signal;
- a feedback offset canceller coupled to the amplifier, the feedback offset canceller controllably canceling DC offset;
- an automatic gain controller coupled to the amplifier, the automatic gain controller controlling gain of the amplifier;
- a feed forward offset canceller;
- and
- a signal peak detector coupled to the feed forward offset canceller and the automatic gain controller, the automatic gain controller being controlled by the signal peak detector, and the feed forward offset canceller further canceling the DC offset.
A direct conversion transceiver system for incorporating an offset correction and automatic gain control system, comprising:
- an antenna receiving an incoming signal;
- an amplifier amplifying a baseband signal which is directly converted from the received incoming signal;
- a feedback offset canceller coupled to the amplifier, the feedback offset canceller controllably canceling DC offset;
- an automatic gain controller coupled to the amplifier, the automatic gain controller controlling gain of the amplifier;
- a feed forward offset canceller;
- and
- a signal peak detector coupled to the feed forward offset canceller and the automatic gain controller, the automatic gain controller being controlled by the signal peak detector, and the feed forward offset canceller further canceling the DC offset.
A computer program storage medium readable by a computing system and encoding a computer program of instructions for executing a computer process for incorporating an offset correction and automatic gain control system into a direct conversion type of transceiver in a communication system, the computer process comprising:
- receiving an incoming signal having a DC content;
- converting the incoming signal to a baseband signal;
- amplifying the baseband signal;
- and
- canceling DC offset and controlling gain of the amplified signal within a preamble period, wherein the DC content of an incoming signal envelop is subtracted from an instantaneous incoming signal plus the DC offset thereby resulting in the incoming signal without the DC offset, the instantaneous incoming signal retaining its necessary DC content while undesired offset is cancelled.
A computer data signal embodied in a carrier wave readable by a computing system and encoding a computer program of instructions for executing a computer process for incorporating an offset correction and automatic gain control system into a direct conversion type of transceiver in a communication system, the computer process comprising:
- receiving an incoming signal having a DC content;
- converting the incoming signal to a baseband signal;
- amplifying the baseband signal;
- and
- canceling DC offset and controlling gain of the amplified signal within a preamble period, wherein the DC content of an incoming signal envelop is subtracted from an instantaneous incoming signal plus the DC offset thereby resulting in the incoming signal without the DC offset, the instantaneous incoming signal retaining its necessary DC content while undesired offset is cancelled.
Dependencies are inferred from the claim text.