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Automatic gain controller and method and communication equipment with said control function

A technology of automatic gain control and gain control signal, which is applied in the direction of gain control, amplification control, gearbox control/balance, etc., and can solve the problems that it is impossible to meet the long-term work, the power consumption cannot be reduced, and the power consumption is increased.

Inactive Publication Date: 2005-04-13
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The execution of such operations may constitute one of the factors that increase power consumption
Therefore, there is a problem that it is impossible to reduce power consumption in equipment requiring automatic gain control operation, and it is almost impossible to satisfy the requirement that such signal processing equipment needs to work for a long time

Method used

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  • Automatic gain controller and method and communication equipment with said control function
  • Automatic gain controller and method and communication equipment with said control function
  • Automatic gain controller and method and communication equipment with said control function

Examples

Experimental program
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Effect test

no. 1 example

[0034] figure 1is a block diagram showing a configuration of the automatic gain control apparatus and a configuration of executing the automatic gain control method according to the first embodiment of the present invention. In this case, this drawing shows a structural example of an automatic gain control (AGC) circuit provided in a receiving system of a radio communication device, which is generally known by the CDMA system, TDMA system , and a portable phone for TDMA / TDD system operation.

[0035] The automatic gain control device is configured by using a variable gain amplifier 1 and an AGC closed-loop control system. This variable gain amplifier 1 is used as variable gain amplifying means for supplying an output signal S12 to a circuit (not shown) provided at a subsequent stage. The output signal S12 is obtained by amplifying the input signal S11 with a variable gain. The AGC closed-loop control system performs an automatic gain control operation for the variable gain ...

no. 2 example

[0057] figure 2 is a block diagram showing a configuration of an automatic gain control apparatus and an automatic gain control method according to a second embodiment of the present invention.

[0058] According to this second embodiment, the automatic gain control device is provided with a variable gain amplifier 1, which operates in a manner similar to the automatic gain control device of the first embodiment described above, and in addition: a detection circuit 2, an A / D The converter 3, the adder 4, the conversion unit 5, the counter 8, the selection switch 9, and the D / A converter 10 are used to form an AGC closed-loop control system.

[0059] Further, the characteristic configuration of this second embodiment is that the automatic gain control device is provided with a latch circuit 6a, an adder 7a, and another latch circuit 17a. The latch circuit 6 a functions as state detection level holding means for holding / outputting the digitized detection voltage S13 derived fr...

no. 3 example

[0070] image 3 is a block diagram showing a configuration of an automatic gain control apparatus and an automatic gain control method according to a third embodiment of the present invention.

[0071] According to this third embodiment, the automatic gain control device is equipped with a variable gain amplifier 1 which operates in a similar manner to the automatic gain control device of the first embodiment described above, and in addition: a detection circuit 2, an A / D The converter 3, the adder 4, the conversion unit 5, the selection switch 9, the D / A converter 10, and the latch circuit 17a are used to form an AGC closed-loop control system.

[0072] Further, the characteristic configuration of this third embodiment is that the automatic gain control device is provided with a demodulation circuit 19 and an RSSI (Received Signal Strength Indicator) 18 . The demodulation circuit 19 demodulates the output signal S12 from the variable gain amplifier 1 to generate a demodulated ...

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PUM

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Abstract

When the input signal S11 is variably amplified by the variable gain amplifier 1 to obtain a predetermined output signal S12, a variable gain control signal is generated by the detection circuit 2, the A / D converter 3, the adder 4, and the conversion unit 5 S15. The latch circuit 6 and the adder 7 calculate the difference between the variable gain control signal generated during the previous control operation and the current variable gain control signal. When the difference result is equal to 0, the counter 8 counts the predetermined steady state duration, thus outputs the non-operational state setting signal S16, and sends a control signal to the amplifier 1 to make each part (2-5) into the non-operational state.

Description

technical field [0001] The present invention generally relates to automatic gain control (hereinafter also referred to as "AGC") for gain controlling an input signal whose signal level is varied in a signal receiving system of a mobile communication device, The level of this input signal can thus be kept constant through a feedback loop. More specifically, the present invention relates to an automatic gain control device and an automatic gain control method capable of switching the operation of a circuit used in a control system in response to a state of automatic gain control operation, and relates to A radio communication device having such an automatic gain control operation. Background technique [0002] Conventionally, in various signal processing equipment, for example, in radio communication equipment, the intensity of the electromagnetic wave receiving electric field varies due to the attenuation of the electromagnetic wave in the electromagnetic wave propagation pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/20H03G3/30H04B1/10H04B1/16H04B3/04
CPCH03G3/3036H03G3/3052
Inventor 岩田靖史市川泰史
Owner PANASONIC CORP