Patent ID: 11929770
Assignee: HONG KONG APPLIED SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE CO., LTD
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A receiver with non-continuous Automatic Gain Control (AGC) comprising:
a front end having a Low-Noise Amplifier (LNA), a Low-Pass Filter (LPF), and a Programmable Gain Amplifier (PGA) in series to amplify a received signal applied to an input of the LNA to generate an amplified output, wherein a gain of the front end is adjustable in response to a gain setting;
a rectifier that rectifies the amplified output from the front end to generate an output voltage;
a data converter that receives the output voltage from the rectifier and generates binary data;
a frame detector that receives the binary data from the data converter and activates a framing signal that is synchronized to frames of the binary data;
a level detector that compares the output voltage from the rectifier to a first threshold to generate a first compare result and to a second threshold to generate a second compare result, wherein the second threshold is greater than the first threshold; and
an AGC controller that is activated for a new frame by the framing signal from the frame detector, the AGC controller initializing the gain setting to a maximum gain in response to the framing signal, the AGC controller decreasing the gain setting in response to the first compare result and the second compare result, the AGC controller locking the gain setting when the first compare result and the second compare result indicate that the output voltage is between the first threshold and the second threshold,
whereby the gain setting is adjusted in response to the framing signal and locked until the AGC controller is activated again for a next new frame.