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Detection circuit and detection circuit adjustment method

A detection circuit and level adjustment technology, applied in the direction of electrical components, amplification control, transmission system, etc., can solve the problems of reduced dynamic range, troublesome, narrow dynamic range, etc.

Inactive Publication Date: 2006-06-14
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, in the conventional detection circuit 1, a certain margin 52 (including a margin 52 in consideration of characteristic deviations of the detectors 22 and 32) is reserved to prevent accuracy from deteriorating due to characteristic deviations of the amplifiers 21, 31 or detectors 22, 32, etc. large margin) to make the characteristic curves of the schematic detectors 22, 32 linear, that is, the detection ranges 26, 36 of the detectors 22, 32 fully overlap, so correspondingly the respective detection ranges 26 of the detectors 22, 32 .
[0018] In addition, in order to realize the dynamic range in the entire detection circuit 1 having the above-mentioned structure, although it can be realized by individually adjusting the amplifiers 21, 31 and the amplifiers 22, 32, the disadvantage of this adjustment operation is that it is more laborious.
[0019] In addition, when the transmission / reception apparatus realizes the AGC function using the detection circuit 1 having the above-mentioned structure, the dynamic range at the time of receiving the signal becomes narrower than the dynamic range that can be detected structurally, so the gain control signal The signal level range is limited, and the AGC function cannot be fully utilized

Method used

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  • Detection circuit and detection circuit adjustment method
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  • Detection circuit and detection circuit adjustment method

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Embodiment approach 1

[0037] Figure 4 It is a block diagram showing the configuration of the detection circuit according to Embodiment 1 of the present invention.

[0038] Figure 4 The detection circuit 100 shown includes a variable attenuator 101, a divider 110, a plurality (here 2) of variable amplifiers 121, 131, a plurality of (here 2) detectors 122, 132, a plurality of (Two here) A / D converters 123 and 133 , and gain control section 150 .

[0039] The variable attenuator 101 is detachably installed in the input part of the detection circuit 100, and the attenuation amount can be controlled according to the attenuation control signal input by the gain control unit 150, and the input detected signal is attenuated with the set attenuation amount, and output to distributor 110.

[0040] The divider 110 divides the signal attenuated by a predetermined attenuation amount into a plurality of identical signals, and outputs them to the variable amplifier 121 and the variable amplifier 131 respective...

Embodiment approach 2

[0080] Figure 9It is a block diagram showing the configuration of the detection circuit according to Embodiment 2 of the present invention. The detection circuit 300 shown in this figure has the same Figure 4 The detection circuit 100 corresponding to Embodiment 1 shown has the same basic configuration, and the same components are given the same reference numerals, and description thereof will be omitted.

[0081] The detection circuit 300 includes the detection circuit 100 of the first embodiment, a temperature sensor 301 for measuring temperature, and a gain correction table 303 for temperature.

[0082] The temperature sensor 301 measures the temperature around the detection circuit 300, and outputs the measurement information to the gain correction unit 151b of the gain control unit 150a.

[0083] In addition, in the gain correction table 303 for temperature, not only the compensation amount for compensating the temperature characteristics of the detector 122 and the de...

Embodiment approach 3

[0098] Figure 10 It is a block diagram showing the configuration of the detection circuit according to Embodiment 3 of the present invention. Figure 10 The detection circuit 400 shown has an Figure 4 The detection circuit 100 corresponding to Embodiment 1 shown has the same basic configuration, and the same components are given the same reference numerals, and description thereof will be omitted.

[0099] The detection circuit 400 includes the detection circuit 100 and a burst gain correction table 401 .

[0100] In general, when detecting a signal (burst signal) whose level changes drastically over time, the level detection accuracy of the detector deteriorates. That is to say, when the detector 122 and the detector 132 respectively detect the burst signals from the variable amplifier 121 and the variable amplifier 131, the respective detection values ​​change and are adjusted to match the detection curve of the detector 122. The lower limit value of the linear portion 1...

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Abstract

The gain control unit (150) controls the attenuator (101) so that the level of the signal output from the attenuator (101) to the variable amplifier (121, 131) can be varied, and at the same time controls the variable amplifier (121, 131) and The gain of the variable amplifier (121, 131) is adjusted. The gain control unit (150) determines the respective gains through this adjustment so that the lower limit value of the detection range of the detector (122) coincides with the upper limit value of the detection range of the detector (132). The detection circuit (100) with this structure can not only prevent the deterioration of detection accuracy caused by the characteristic deviation of equipment such as amplifiers or detectors, but also can simply expand the dynamic range and fully realize the AGC function.

Description

technical field [0001] The present invention relates to a detection circuit for detecting the signal level of an input signal, a transmitting device and a receiving device having the circuit, and a method for adjusting the detection circuit. Background technique [0002] As a conventional detection circuit, for example, a detection circuit described in Japanese Patent Laid-Open No. 11-174143 is known. [0003] FIG. 1 is a block diagram showing main parts of this conventional detection circuit. [0004] The detection circuit 1 shown in Fig. 1 has: the distributor 10 that the input signal is distributed; a plurality of (here 2) amplifiers 21, 31 that amplify the distributed signal with different gains respectively; Detectors 22 and 23 for detecting signals amplified with different gains; A / D converters 23 and 33 for converting and outputting the detected detection values. [0005] The detectors 22 and 32 have the same detection characteristic, and as a general characteristic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/30H03G3/20H04B1/04H04B1/16
CPCH03G3/3042H03G3/3052
Inventor 立野吉英小坂裕史佐佐木亮
Owner PANASONIC CORP