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AGC low threshold signal level detection

A low-threshold, level technology, applied in the direction of electrical components, amplification control, gain control, etc., can solve the problems of reducing receiver performance, gain not maximizing, etc., and achieve the effect of improving utilization

Inactive Publication Date: 2013-11-20
OPTIS CELLULAR TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As mentioned above, this will degrade the performance of the receiver as the gain will never be maximized

Method used

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  • AGC low threshold signal level detection
  • AGC low threshold signal level detection
  • AGC low threshold signal level detection

Examples

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Embodiment Construction

[0032] The present invention will now be described in detail with reference to the accompanying drawings.

[0033] The invention can be implemented on any analog or analog / digital receiver. The input signal to the receiver s in Can be low frequency audio signals or single or multi-carrier signals used in communication systems. Therefore, in the description, we will pass as Figure 4 The present invention is illustrated by the analog / digital receiver described in . However, this is only one possible embodiment of the invention when using one attenuator. It is also possible to use more than one attenuator as described below.

[0034] Figure 4 is shown having an analog input signal s entering at input 420 in receiver 400. Figure 4 The example of shows a single carrier receiver for a telecommunication application, and the input signal is an RF (radio frequency) signal. The input signal is modulated in this example by an established modulation technique called IQ modulation,...

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Abstract

The invention provides a receiver comprising an input end, an Rx-chain with at least one regulating means and an output end. The receiver further comprises a feedback loop in the Rx-chain, the regulating means arranged for providing a higher or lower gain setting. The feedback loop comprises an AGC Multilevel threshold detector unit, AMU. The AMU comprises at least one Low Multilevel Threshold Detector, LMTD, and the LMTD comprises at least two threshold detectors, each detector having an associated low threshold level and detection interval, the length of the detection interval being shorter the lower the low threshold level is arranged to be set. The higher gain setting being arranged to be initiated through the feedback loop when the absolute level of an AGC input signal has been below at least one of the low threshold levels during the entire detection interval associated with that low threshold level. The invention also provides a communication system comprising the receiver, an AGC Multilevel threshold detector Unit (AMU) and a method to adjust the gain in a receiver.

Description

technical field [0001] The invention relates to the field of receivers using automatic gain control (AGC). The receiver can be used in any application such as telecommunication applications, where the receiver can be used in a base station or a mobile phone. Background technique [0002] In many receivers, especially in high performance multicarrier receivers, the linearity and dynamic range requirements are extremely challenging. To meet demanding requirements, automatic gain control (AGC) can be used to adjust the dynamic range of the receiver according to the received signal level, and thus relax the dynamic range of the receiver circuit. In such receivers, an AGC control function is required. [0003] FIG. 1 schematically shows the principle of a prior art AGC receiver 100 with an input terminal 101 and an output terminal 102 . Components coupled in series between the input and output terminals are part of the Rx chain. The input signal at the input terminal 101 pass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/30
CPCH03G3/3052
Inventor V·比约克
Owner OPTIS CELLULAR TECH LLC
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