Combined discrete automatic gain control (AGC) and DC estimation
Patent 6654593 Issued on November 25, 2003. Estimated Expiration Date: 
October 30, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 30, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAutomatic-gain-control circuit compensating for changes in gain control characteristics Direct current (DC) offset compensation method and apparatus Cellular TDMA base station receiver with dynamic DC offset correction Radiotelephone receiver and method with improved dynamic range and DC offset correction Receiver having DC offset decreasing function and communication system using the same Patent #: 6498929 InventorsAssigneeApplicationNo. 09/699794 filed on 10/30/2000US Classes:455/234.1, Automatic455/312, In demodulator or low frequency (e.g., audio frequency)455/324Homodyne (i.e., zero beat or synchrodyne reception)ExaminersPrimary: Vo, NguyenAttorney, Agent or FirmInternational ClassesH03G 3/00 (20060101)H04L 25/06 (20060101) H04B 7/005 (20060101) H04B 1/30 (20060101) H04L 27/38 (20060101) AbstractAn automatic gain control (AGC) and DC estimation and correction technique for wireless communication devices is provided. An AGC signal, which controls a gain applied to a received signal by a gain stage to generate a scaled signal, is assigned one of a relatively small number of values in accordance with the amplitude of the scaled signal. An estimate of a DC offset in the scaled signal corresponding to each value of the AGC signal is stored in a memory. A DC estimation arrangement then reads the stored estimate associated with the particular value of the AGC signal from the memory and generates a current DC estimate based thereon. The current estimate is then used to correct the scaled signal for DC offset and to update the stored estimate.Field of SearchAutomaticProcessor controlled Automatic gain control signal derived from information signal Responsive to plural inputs Automatic gain control to improve strong signal handling Noise or interference elimination Using plural separate signal paths In demodulator or low frequency (audio amplifier circuit) Internally generated noise or oscillations In demodulator or low frequency (e.g., audio frequency) Unwanted oscillation or radiation prevention | |
