Patent
Automatic gain control
Nystroem Christian,Konradsson Per,Ari Juhani Grasbeck +2 more
- 13 Feb 2002
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TL;DR: In this article, the automatic gain control for an amplifier for received radio signals by means of an automatic gain controller signal (c) was proposed, which can control the gain of the amplifiers such that the resulting signal components (IP-LP, QP-LP) are maintained at signal level (I, Q) less than a predetermined limit level.
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Abstract: The invention relates to gain control for an amplifier for received radio signals by means of an automatic gain control signal (c). A down converter (103) produces signal components (I; Q) that are amplified in a respective amplifier (104, 105). Then, the resulting signal components (IP-LP; QP-LP) are digitised in A/D-converters (110; 111) for further processing in a digital signal processor (112) and are also fed to a respective signal level detector (113; 114) whose output signals ([I]; [Q]) are combined (115) into a combined signal (VΣ). This signal (VΣ) is forwarded to a gain control unit (116), which produces the automatic gain control signal (c). The automatic gain control signal (c) controls the gain of the amplifiers (104; 105) such that the resulting signal components (IP-LP; QP-LP) are maintained at signal level ([I]; [Q]) less than a predetermined limit level being adapted to the A/D-converters (110; 111).
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Citations
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References
Patent
Method and apparatus for automatic gain control and DC offset cancellation in quadrature receiver
Wilson Nathaniel B,Peter J. Black,Peterzell Paul E +2 more
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TL;DR: In this article, an automatic gain control (AGC) and D.C. offset correction method and apparatus for controlling signal power of a received RF signal within a dual mode quadrature receiver is disclosed.
190
Patent
Automatic gain control in a zero intermediate frequency radio device
Mohindra Rishi
- 22 Dec 1999
TL;DR: In this paper, the automatic gain controller initially sets the gain of the Rx path of the radio device to a maximum of minimum gain, and then waits for DC-offsets in the RX path to cancel.
110
Patent
DC offset correction loop for radio receiver
Charles R. Ruelke
- 29 Feb 2000
TL;DR: In this paper, a direct current offset correction loop (DCOCL) is augmented by an independent automatic gain control (AGC) circuit that utilizes the same control signal, which includes a multiplicity of adjustable gain stages with threshold and characteristic response that is controlled by an AGC control block.
60
Patent
Demodulator for consumer uses
Gurantz Itzhak,Yoav Goldenberg,Sree A. Raghavan +2 more
- 30 Dec 1992
TL;DR: A demodulator responsive to a symbol containing analog signal includes a pair of relatively inexpensive analog-to-digital converters for sampling I and Q channels of the signal only once per symbol.
46
Patent
Digital automatic gain control, as for a receiver
Alvin Reuben Balaban
- 15 Jun 1999
TL;DR: In this paper, a high-gain digital element such as a pulse width modulator or a comparator controlling a current source is applied to the gain control input of an amplifier whose gain is to be controlled.
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