CN104253591B - Suitable for the automatic controlling method for gain of big input dynamic range - Google Patents
Suitable for the automatic controlling method for gain of big input dynamic range Download PDFInfo
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- CN104253591B CN104253591B CN201310264448.XA CN201310264448A CN104253591B CN 104253591 B CN104253591 B CN 104253591B CN 201310264448 A CN201310264448 A CN 201310264448A CN 104253591 B CN104253591 B CN 104253591B
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Abstract
The present invention relates to the automatic controlling method for gain suitable for big input dynamic range, it includes：Automatic gain control apparatus receives the radiofrequency signal of input；Automatic gain control apparatus judges the strong and weak situation of change of input signal；Automatic gain control apparatus controls the switching of link gain states and PGA yield values according to judged result respectively, i.e., when input signal from it is small change to big when, if PGA gain be less than GL, then link gain states are switched to A2 from A1 or A2 is switched to A3, meanwhile, PGA yield value is switched to GH；When input signal from when changing to small greatly, if PGA gain is more than GH, then link gain states are switched to A2 from A3 or A2 is switched to A1, meanwhile, PGA yield value is switched to GL.Automatic gain control apparatus is arranged in whole receives link by the present invention, control the reasonable switching of link gain states and PGA yield values, while the dynamic range of signal receiving circuit is increased, it is prevented effectively from PGA and self-excitation problem occurs, improve the stability of receives link.
Description
Technical field
The present invention relates to a kind of gain control method of receiving circuit, more particularly to suitable for big input dynamic range
Automatic controlling method for gain.
Background technology
In communication system, signal, due to the influence of various factors, can occur in transmission from the signal strength of external reception
Change, shows as the decay of signal.Due to the non-linear and multipath fading that cause signal of transmission channel, simultaneous transmission of signals
Disturbed by various noises, this will make it that the signal that receiver is received is at times strong and at other times weak.The excursion of input signal is often very
Greatly, can be a microvolt or tens microvolts when signal is weak, up to hundreds of millivolts when signal is strong, peak signal and most weak signal difference
Up to tens decibels, small-signal is received in order to as reliable as possible, automatic growth control electricity is generally provided with the receiver
Road, the purpose is to enable the gain of receiver with the power of input signal adjust automatically, the main work(of automatic growth control
Can, in the case where input signal amplitude is changed greatly, amplitude output signal is kept constant or is become in a specific range
Change, it is ensured that when receiving small-signal, the high gain of receiver, and when receiving strong signal, the gain of receiver is low, so that
Ensure the performance of whole system.
In receiving circuit, existing mode is in last PGA circuits（Programmable gain amplifier device circuit）Increased
Benefit control, however, when the signal of Larger Dynamic to be handled, then necessarily requiring PGA dynamic range very big, may so cause
PGA gain is too high, and then PGA self-excitation problem is occurred.
For another example patent No. CN102857246A, the auto gain control method and device of permanent envelope receiver, using fixation
The limiting amplifier of yield value, the reception signal according to the input signal strength of low-noise amplifier and from limiting amplifier
Intensity is indicated, the yield value of low-noise amplifier, RF mixer or programmable gain amplifier is adjusted, until input signal
Intensity does not occur saturation, and receives the maximum that the intensity of signal indicates that not up to limiting amplifier can be indicated, and is not below
During the minimum value that limiting amplifier can be indicated, automatic growth control is completed.In automatic gain control process, although without adjusting
Whole digitally controlled variable gain inner ring, improves the speed of automatic growth control, but the dynamic range of programmable gain amplifier must
Must be very big, the gain of programmable gain amplifier may be caused too high, and then PGA self-excitation problem is occurred.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of gain suitable for big input dynamic range
Autocontrol method, it can increase the dynamic range of signal receiving circuit, can be prevented effectively from programmable gain amplifier and occur certainly
Swash problem.
The purpose of the present invention is achieved through the following technical solutions：Suitable for the Gain Automatic of big input dynamic range
Control method, it comprises the following steps：
S01：The automatic gain control apparatus being arranged in receives link receives the radiofrequency signal of input；
S02：The automatic gain control apparatus judges the strong and weak situation of change of the radiofrequency signal received；
S03：The automatic gain control apparatus controls link gain states and programmable-gain respectively according to judged result
The switching of amplifier gain value, it includes following two situations：
（1）When the radiofrequency signal of input changes from small to large, if the gain of programmable gain amplifier is less than GL, then will
Link gain states are switched to A2 from A1 or A2 is switched to A3, meanwhile, the yield value of programmable gain amplifier is switched to
GH；
（2）When the radiofrequency signal of input changes from big to small, if the gain of programmable gain amplifier is more than GH, then will
Link gain states are switched to A2 from A3 or A2 is switched to A1, meanwhile, the yield value of programmable gain amplifier is switched to
GL。
Wherein, GLFor the gain floor of programmable gain amplifier, GHFor the upper gain limit of programmable gain amplifier, A1,
A2, A3 are link gain states, and A1 ＞ A2 ＞ A3.
It is described when the radiofrequency signal of input changes from small to large, link gain states are switched to A2 from A1, and meet：
A1·GL＜ A2GH。
It is described when the radiofrequency signal of input changes from small to large, link gain states are switched to A3 from A2, and meet：
A2·GL＜ A3GH。
It is described when the radiofrequency signal of input changes from big to small, link gain states are switched to A2 from A3, and meet：
A2·GL＜ A3GH。
It is described when the radiofrequency signal of input changes from big to small, link gain states are switched to A1 from A2, and meet：
A1·GL＜ A2GH。
Further, described link gain states A1, A2, A3 do not include the gain-state of programmable gain amplifier.
Further, described GHValue to make minimum input signal link gain states be A1 states when, its believe
Number output meet require, described GLValue to make maximum input signal link gain states be A3 states when, its signal
Output, which is met, to be required.
The beneficial effects of the invention are as follows：Automatic gain control apparatus is arranged in whole receives link, control link increases
The reasonable switching of beneficial state and programmable gain amplifier yield value, can not only increase the dynamic range of signal receiving circuit, also
It can guarantee that when handling the signal of Larger Dynamic, be prevented effectively from programmable gain amplifier and self-excitation problem occur, improve receives link
Stability.
Brief description of the drawings
Fig. 1 is control flow chart of the invention；
Fig. 2 is schematic diagram of the invention.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to
It is as described below.
As shown in Figure 1, it is adaptable to which the automatic controlling method for gain of big input dynamic range, it comprises the following steps：
S01：The automatic gain control apparatus being arranged in receives link receives the radiofrequency signal of input；
S02：The automatic gain control apparatus judges the strong and weak situation of change of the radiofrequency signal received；
S03：The automatic gain control apparatus controls link gain states and programmable-gain respectively according to judged result
Amplifier（PGA）The switching of yield value.If PGA gain is more than GL~GHScope, then the gain of receives link A1~A3 it
Between switch, as shown in Fig. 2 it include following two situations：
（1）When the radiofrequency signal of input changes from small to large, if the gain of programmable gain amplifier is less than GL, then will
Link gain states are switched to A2 from A1 or A2 is switched to A3, meanwhile, the yield value of programmable gain amplifier is switched to
GH；
（2）When the radiofrequency signal of input changes from big to small, if the gain of programmable gain amplifier is more than GH, then will
Link gain states are switched to A2 from A3 or A2 is switched to A1, meanwhile, the yield value of programmable gain amplifier is switched to
GL。
Wherein, link gain states A1, A2, A3 does not include the gain-state of programmable gain amplifier, and A1 ＞ A2 ＞
A3.The gain of programmable gain amplifier is fixed on GL~GHBetween, wherein, GLFor the gain floor of programmable gain amplifier,
GHFor the upper gain limit of programmable gain amplifier, i.e. GH>GL。GHValue to make minimum input signal in link gain states
During for A1 states, its signal output, which is met, to be required, GLValue to make maximum input signal link gain states be A3 states
When, its signal output, which is met, to be required.
It is described when the radiofrequency signal of input changes from small to large, link gain states are switched to A2 from A1, and meet：
A1·GL＜ A2GH。
It is described when the radiofrequency signal of input changes from small to large, link gain states are switched to A3 from A2, and meet：
A2·GL＜ A3GH。
So there was only PGA gain reduction in A2 states, output is met requirement, if if opposite, PGA's
Gain can be raised, and link gain switches again, link will be made unstable.
It is described when the radiofrequency signal of input changes from big to small, link gain states are switched to A2 from A3, and meet：
A2·GL＜ A3GH。
It is described when the radiofrequency signal of input changes from big to small, link gain states are switched to A1 from A2, and meet：
A1·GL＜ A2GH。
The gain for so there was only PGA in A2 states is raised, and output is met requirement, if if opposite, PGA's
Gain can be reduced, and link gain switches again, link will be made unstable.
Claims (1)
1. suitable for the automatic controlling method for gain of big input dynamic range, it comprises the following steps：
S01：The automatic gain control apparatus being arranged in receives link receives the radiofrequency signal of input；
S02：The automatic gain control apparatus judges the strong and weak situation of change of the radiofrequency signal received；
It is characterized in that：Methods described is further comprising the steps of：
S03：The automatic gain control apparatus controls link gain states and programmable automation controller respectively according to judged result
The switching of device yield value, it includes following two situations：
（1）When the radiofrequency signal of input changes from small to large, if the gain of programmable gain amplifier is less than GL, then by link
Gain-state is switched to A2 from A1 or A2 is switched to A3, meanwhile, the yield value of programmable gain amplifier is switched to GH；
（2）When the radiofrequency signal of input changes from big to small, if the gain of programmable gain amplifier is more than GH, then by link
Gain-state is switched to A2 from A3 or A2 is switched to A1, meanwhile, the yield value of programmable gain amplifier is switched to GL；
Wherein, GLFor the gain floor of programmable gain amplifier, GHFor the upper gain limit of programmable gain amplifier, A1, A2,
A3 is link gain states, and A1 ＞ A2 ＞ A3；
It is described when the radiofrequency signal of input changes from small to large, link gain states are switched to A2 from A1, and meet：
A1•GL＜ A2 GH；
It is described when the radiofrequency signal of input changes from small to large, link gain states are switched to A3 from A2, and meet：
A2•GL＜ A3 GH；
It is described when the radiofrequency signal of input changes from big to small, link gain states are switched to A2 from A3, and meet：
A2•GL＜ A3 GH；
It is described when the radiofrequency signal of input changes from big to small, link gain states are switched to A1 from A2, and meet：
A1•GL＜ A2 GH；
Described link gain states A1, A2, A3 does not include the gain-state of programmable gain amplifier；
Described GHValue to make minimum input signal link gain states be A1 states when, its signal output meet require,
Described GLValue to make maximum input signal link gain states be A3 states when, its signal output meet require.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310264448.XA CN104253591B (en) | 2013-06-28 | 2013-06-28 | Suitable for the automatic controlling method for gain of big input dynamic range |
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|---|---|---|---|
| CN201310264448.XA CN104253591B (en) | 2013-06-28 | 2013-06-28 | Suitable for the automatic controlling method for gain of big input dynamic range |
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| CN104253591A CN104253591A (en) | 2014-12-31 |
| CN104253591B true CN104253591B (en) | 2017-10-17 |
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| EP3226426B1 (en) * | 2016-03-31 | 2019-12-04 | Nxp B.V. | Method and system for controlling an amplifier of a communications device |
Citations (6)
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|---|---|---|---|---|
| CN1335734A (en) * | 2000-07-14 | 2002-02-13 | 日本电气株式会社 | Gain control amplified circuit and terminal equipment with the same gain control amplified circuit |
| CN1810023A (en) * | 2003-06-20 | 2006-07-26 | 皇家飞利浦电子股份有限公司 | Receiver for receiving radio frequency signals |
| CN101222209A (en) * | 2007-01-02 | 2008-07-16 | 晨星半导体股份有限公司 | Dynamic bandwidth compensating method and associated apparatus |
| CN101510786A (en) * | 2008-02-14 | 2009-08-19 | 慧国(上海)软件科技有限公司 | Receiver with low power consumption |
| CN102362429A (en) * | 2009-03-23 | 2012-02-22 | 高通股份有限公司 | Amplifier supporting multiple gain modes |
| WO2012150420A1 (en) * | 2011-05-05 | 2012-11-08 | Commissariat à l'énergie atomique et aux énergies alternatives | Amplification circuit and reception chain |
-
2013
- 2013-06-28 CN CN201310264448.XA patent/CN104253591B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1335734A (en) * | 2000-07-14 | 2002-02-13 | 日本电气株式会社 | Gain control amplified circuit and terminal equipment with the same gain control amplified circuit |
| CN1810023A (en) * | 2003-06-20 | 2006-07-26 | 皇家飞利浦电子股份有限公司 | Receiver for receiving radio frequency signals |
| CN101222209A (en) * | 2007-01-02 | 2008-07-16 | 晨星半导体股份有限公司 | Dynamic bandwidth compensating method and associated apparatus |
| CN101510786A (en) * | 2008-02-14 | 2009-08-19 | 慧国(上海)软件科技有限公司 | Receiver with low power consumption |
| CN102362429A (en) * | 2009-03-23 | 2012-02-22 | 高通股份有限公司 | Amplifier supporting multiple gain modes |
| WO2012150420A1 (en) * | 2011-05-05 | 2012-11-08 | Commissariat à l'énergie atomique et aux énergies alternatives | Amplification circuit and reception chain |
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| CN104253591A (en) | 2014-12-31 |
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