CN103516366B - Input signal intensity indicator and indicating method - Google Patents
Input signal intensity indicator and indicating method Download PDFInfo
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- CN103516366B CN103516366B CN201310446095.5A CN201310446095A CN103516366B CN 103516366 B CN103516366 B CN 103516366B CN 201310446095 A CN201310446095 A CN 201310446095A CN 103516366 B CN103516366 B CN 103516366B
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Abstract
The invention discloses an input signal intensity indicator and an indicating method. The input signal intensity indicator can carry out quantification processing on the amplitude of input signals and output binary digit signals corresponding to the intensity of the input signals, a special analog-digital converter does not need to carrying out conversion from analog signals to digital signals, and accordingly the relationship of the amplitude of the input signals and output voltages does not need to be measured in advance, cost and structure complexity of the input signal indicator are lowered, and the whole processing course of the input signal intensity indicator is simplified.
Description
Technical field
The present invention relates to electronic circuit technology field, in particular, be related to a kind of input signal strength indicator and
Indicating means.
Background technology
Received signal strength indicator device is common a kind of circuit module in radio-frequency transmitter, and it can be by believing input
Number amplitude is converted into voltage or current signal to indicate the intensity size of receipt signal.In traditional received signal strength indicator device
Circuit output be analog voltage or current signal it is therefore desirable to analog voltage or electric current are converted into number using analog-digital converter
The binary numeral that word circuit is capable of identify that, thus carry out the process of digital baseband further.
But, in received signal strength indicator device, additional modulus converter, not only increases whole received signal strength
The cost of indicator and structure complexity and it is necessary to test in advance obtain received signal strength indicator device amplitude output signal with
Relation between output voltage, to facilitate the processing procedure of follow-up derivation input signal amplitude size, this results in receipt signal
The comparatively laborious complexity of whole processing procedure of volume indicator.
Content of the invention
In view of this, the invention provides a kind of input signal strength indicator and indicating means, to overcome prior art
In due to the whole received signal strength indicator device cost that there is analog-digital converter and lead in received signal strength indicator device and
Complex structure and the problem of whole processing procedure very complicated.
For achieving the above object, the following technical scheme of present invention offer:
A kind of input signal strength indicator, comprising:
Analog signal conversion, for being converted to corresponding analog current signal by input signal；Described analog current
Signal is linearly negatively correlated with the range value of described input signal；
Low-pass filter circuit, for described analog current signal is carried out low-pass filtering treatment, and produces analog voltage letter
Number；The parameter of described low-pass filter circuit is controlled by the first output valve of conversion control circuit；
Voltage comparator circuit, the threshold voltage for being produced described analog voltage signal with threshold voltage generation circuit is entered
Row compares, and exports comparative result；
Threshold voltage generation circuit, for producing threshold voltage high level and threshold voltage low value；Described threshold voltage high level
The voltage range determining with described threshold voltage low value is controlled by the second output valve of described conversion control circuit；
Conversion control circuit, exports the first output valve for the voltage ratio according to described voltage comparator circuit compared with output control
Or second output valve, and export numeral indication signal corresponding with input signal amplitude.
Optionally, described analog signal conversion includes n amplitude limiter and n+1 commutator；Wherein, described amplitude limiter
Amplify for input signal is entered line amplitude, described commutator is used for for ac signal being converted to DC signal, and each is whole
The DC signal of stream device output collects generation analog current signal；Described n is positive integer.
Optionally, described low-pass filter circuit one end is connected with the outfan of described analog signal conversion, a termination
Ground, including an electric capacity being arranged in parallel and a programmable resistance.
Optionally, described voltage comparator circuit includes the first comparison circuit and the second comparison circuit, and described first is relatively more electric
Road is used for relatively described analog voltage signal and voltage threshold high level, and described second comparison circuit is used for relatively described analog voltage
Signal and voltage threshold low value.
Optionally, described threshold voltage generation circuit includes programmable current source and two divider resistances being arranged in series；
Described programmable current source is controlled by the second output valve of described conversion control circuit.
Optionally, also include:
The clock circuit being connected with described conversion control circuit, for providing clock signal for described conversion control circuit.
Optionally, also include:
One end is connected with the outfan of described analog signal conversion, and what one end was connected with described conversion control circuit can
Program current mirror, described programmable current mirror is controlled by the 3rd output valve of described conversion control circuit.
A kind of input signal strength indicating means, is applied in above-mentioned input signal strength indicator, comprising:
When described input signal amplitude is zero, the second output valve is set to maximum by conversion control circuit；
Conversion control circuit executes self calibration flow process；
Execution input signal strength measurement procedure；
Output numeral corresponding with input signal amplitude indication signal.
Optionally, described self calibration flow process includes: in the case that analog voltage signal is more than threshold voltage high level, described
Conversion control circuit reduces the first output valve, controls the resistance value reducing low-pass filter circuit to reduce described analog voltage signal
Numerical value；In the case that described analog voltage signal is less than threshold voltage low value, described conversion control circuit increases described the
One output valve, controls the numerical value to increase described analog voltage signal for the resistance value increasing described low-pass filter circuit；
Repeat described self calibration flow process, until the numerical value of described analog voltage signal is located at described threshold voltage high level
And in the voltage range of threshold voltage low value determination.
Optionally, described self calibration flow process includes: in the case that analog voltage signal is more than threshold voltage high level, described
Conversion control circuit reduces the 3rd output valve, controls and reduces analog current signal to reduce the numerical value of described analog voltage signal；
In the case that described analog voltage signal is less than threshold voltage low value, described conversion control circuit increases described 3rd output
Value, controls and increases analog current signal to increase the numerical value of described analog voltage signal；
Repeat described self calibration flow process, until the numerical value of described analog voltage signal is located at described threshold voltage high level
And in the voltage range of threshold voltage low value determination.
Optionally, described input signal strength measurement procedure includes:
Described conversion control circuit monitors analog voltage signal by voltage comparator circuit, when described analog voltage signal is little
When threshold voltage low value, described conversion control circuit reduces the second output valve, controls and reduces described programmable current source
Electric current is to reduce threshold voltage；When described analog voltage signal is more than threshold voltage high level, described conversion control circuit increases
Described second output valve, controls the electric current increasing described programmable current source to increase threshold voltage；Until described analog voltage
The numerical value of signal is located in the voltage range that described threshold voltage high level and threshold voltage low value determine.
Optionally, before exporting numeral indication signal corresponding with input signal amplitude, also include:
In the conversion control circuit m clock cycle of detection, whether analog voltage signal is all in threshold voltage high level and threshold value
In the voltage range that voltage low value determines, if it is, entering output numeral corresponding with input signal amplitude indication signal
Step；Described m is positive integer.
Understand via above-mentioned technical scheme, compared with prior art, the embodiment of the invention discloses a kind of input signal
Volume indicator and indicating means, the amplitude of input signal can be carried out quantification treatment by described input signal strength indicator,
And export binary digital signal corresponding with input signal strength, to be simulated letter without special analog-digital converter
Number to digital signal conversion, thus also without the relation measuring in advance between input signal amplitude and output voltage, not only
Reduce cost and the structure complexity of input signal indicator, and also simplify the whole place of input signal strength indicator
Reason flow process.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing providing obtains other accompanying drawings.
Fig. 1 is the electrical block diagram of input signal strength indicator disclosed in the embodiment of the present invention；
Fig. 2 is the circuit structure diagram of analog signal conversion disclosed in the embodiment of the present invention；
Fig. 3 is the circuit structure diagram of low-pass filter circuit disclosed in the embodiment of the present invention；
Fig. 4 is the circuit structure diagram of voltage comparator circuit disclosed in the embodiment of the present invention；
Fig. 5 is the circuit structure diagram of threshold voltage generation circuit disclosed in the embodiment of the present invention；
Fig. 6 is the electrical block diagram of the embodiment of the present invention another input signal strength indicator disclosed；
Fig. 7 is the circuit structure diagram of programmable current mirror disclosed in the embodiment of the present invention；
Fig. 8 is the flow chart of input signal strength indicating means disclosed in the embodiment of the present invention；
Fig. 9 is the schematic diagram of self calibration flow process disclosed in the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
Fig. 1 is the electrical block diagram of input signal strength indicator disclosed in the embodiment of the present invention, referring to Fig. 1 institute
Show, described input signal strength indicator may include that
Analog signal conversion, for being converted to corresponding analog current signal i by input signalrssi；Described simulation
Current signal irssiLinearly negatively correlated with the range value of described input signal；
In a schematic example, the concrete structure of described analog signal conversion may refer to Fig. 2, and Fig. 2 is
The circuit structure diagram of analog signal conversion disclosed in the embodiment of the present invention, as shown in Fig. 2 described analog signal conversion
N amplitude limiter and n+1 commutator can be included, in Fig. 2 taking 4 amplitude limiters and 5 commutators as a example.Wherein, described amplitude limit
Device is used for for input signal entering line amplitude amplification；Described commutator is used for for input signal entering line amplitude amplification, each commutator
The DC signal of output collects generation analog current signal irssi.Wherein said n is positive integer.
Low-pass filter circuit, for by described analog current signal irssiCarry out low-pass filtering treatment, and produce simulation electricity
Pressure signal vrssi；
The parameter of described low-pass filter circuit is controlled by the first output valve of conversion control circuit.Described low-pass filter circuit
One end be connected with the outfan of described analog signal conversion, one end be grounded, with generate with described analog current signal
irssiCorresponding analog voltage signal vrssi.
In a schematic example, the concrete structure of described low-pass filter circuit may refer to Fig. 3, and Fig. 3 is this
The circuit structure diagram of low-pass filter circuit disclosed in bright embodiment, as shown in figure 3, described low pass filter can include parallel connection set
The electric capacity c putting an and programmable resistance r1.Due to one end ground connection of described low pass filter, therefore can be by changing
The resistance of described programmable resistance r1, to change described analog voltage signal vrssiNumerical value.
Voltage comparator circuit, for by described analog voltage signal vrssiThe threshold value electricity producing with threshold voltage generation circuit
Pressure is compared, and exports comparative result；
The concrete structure of described voltage comparator circuit may refer to Fig. 4, and Fig. 4 is for voltage ratio disclosed in the embodiment of the present invention relatively
The circuit structure diagram of circuit, as shown in figure 4, described voltage comparator circuit can include the first comparison circuit 401 and second compare
Circuit 402, described first comparison circuit 401 is used for relatively described analog voltage signal vrssiAnd threshold voltage high level vh, described
Second comparison circuit 402 is used for relatively described analog voltage signal vrssiAnd threshold voltage low value vl.Described first comparison circuit
401 and the comparative result of described second comparison circuit 402 all export to conversion control circuit.
Threshold voltage generation circuit, for producing threshold voltage high level vh and threshold voltage low value vl；
Described threshold voltage high level vh and described threshold voltage low value vl are by the second output valve of described conversion control circuit
Control.
The concrete structure of described threshold voltage generation circuit may refer to Fig. 5, and Fig. 5 is threshold value disclosed in the embodiment of the present invention
The circuit structure diagram of voltage generation circuit, as shown in figure 5, described threshold voltage generation circuit may include that programmable current source
And two divider resistance r2 and r3 being arranged in series；Described programmable current source is by the second output valve of described conversion control circuit
Control.
Specifically for a bit, the second output valve of described conversion control circuit can directly control the defeated of programmable current source
Go out size of current, and two divider resistances be arranged in series, and the consitutional two ends of two divider resistances connect respectively described
Programmable circuit source and ground, are to determine due to the resistance of two divider resistances, therefore, when the output of described programmable current source
When electric current is different, the voltage that two divider resistances are got is just different, the voltage that can get two divider resistances and as threshold
Threshold voltage high level vh, the voltage that divider resistance closely is got is as threshold voltage low value vl.It should be noted that it is described
Threshold voltage high level vh and described threshold voltage low value vl are not numerical value, threshold voltage high level vh and the described threshold of one group of fixation
Threshold voltage low value vl can change with the change of described programmable current source output current size, and described programmable current
The size of source output current is directly controlled by the second output valve that described conversion control circuit exports.
Conversion control circuit, exports the first output valve for the voltage ratio according to described voltage comparator circuit compared with output control
Or second output valve, and export numeral indication signal corresponding with input signal amplitude.
Described input signal strength indicator can have different mode of operations, such as self-calibration mode and measurement input letter
Number light mode.Described conversion control circuit, under different mode of operations, can produce according to described voltage comparator circuit
Comparative result carry out the threshold value that the resistance value of low-pass filter circuit described in Indirect method or described threshold voltage generation circuit produce
Voltage.
Fig. 6 is the electrical block diagram of the embodiment of the present invention another input signal strength indicator disclosed, in Fig. 6
Show the specific circuit structure of each several part of input signal strength indicator, above-mentioned input signal can be understood in conjunction with Fig. 6
The each several part circuit structure of indicator and its annexation.
In the present embodiment, the amplitude of input signal can be carried out quantification treatment by described input signal strength indicator, and
Export binary digital signal corresponding with input signal strength, to be simulated signal without special analog-digital converter
To the conversion of digital signal, thus also without the relation measuring in advance between input signal amplitude and output voltage, not only dropping
The low cost of input signal indicator and structure complexity, and also simplify the whole process of input signal strength indicator
Flow process.
In other examples, described input signal strength indicator is except each circuit knot disclosed in above-described embodiment
Outside structure, the clock circuit being connected with described conversion control circuit can also be included, during for providing for described conversion control circuit
Clock signal, so that the regular work under the driving of clock circuit of described conversion control circuit.
Further, in other examples, described received signal strength indicator device can also include one end with described
The outfan of analog signal conversion connects, the programmable current mirror that one end is connected with described conversion control circuit, described can
Program current mirror is controlled by the 3rd output valve of described conversion control circuit.Specifically can by change d(3:0) value change
Become the value of analog current signal.The structural representation of described programmable current mirror can be found in Fig. 7, and Fig. 7 is that the embodiment of the present invention is public
The circuit structure diagram of the programmable current mirror opened.Wherein, the d0-d3 of Fig. 7 top half is on-off circuit, and the latter half is electric current
Mirror circuit structure；irssiFor analog current signal, irssi-1The 3rd output valve for conversion control circuit output.
Fig. 8 is the flow chart of input signal strength indicating means disclosed in the embodiment of the present invention, described input signal strength
Indicating means is applied in input signal strength indicator disclosed in above-described embodiment, and described input signal strength indicator includes
Analog signal conversion, low-pass filter circuit, voltage comparator circuit, threshold voltage generation circuit and conversion control circuit.Ginseng
As shown in Figure 8, described input signal strength indicating means may include that
Step 801: when described input signal amplitude is zero, the second output valve is set to maximum by conversion control circuit；
When described input signal strength indicator is started working, the input range of input signal is zero, due to simulation electricity
Stream signal irssiLinearly negatively correlated with the range value of institute input signal, therefore, analog current signal i nowrssiWith simulation electricity
Pressure signal vrssiBy maximum.Now need first the second output valve to be set to maximum, then execute self calibration flow process.And by
Two output valves are set to maximum, and threshold voltage high level vh now producing can should produce for described threshold voltage generation circuit
Maximum threshold voltage.
Step 802: conversion control circuit execution self calibration flow process；
In a schematic example, the concrete steps of described self calibration flow process may refer to Fig. 9, and Fig. 9 is the present invention
The schematic diagram of self calibration flow process disclosed in embodiment, as shown in figure 9, may include that
Step 901: judge described analog voltage signal vrssiWhether it is more than threshold voltage high level vh, if it is, entering step
Rapid 902, if not, entering step 905；
Step 902: conversion control circuit reduces the first output valve, controls the resistance value reducing low-pass filter circuit to reduce
Described analog voltage signal vrssiNumerical value；Enter step 905；
Step 903: judge described analog voltage signal vrssiWhether it is less than threshold voltage low value vl, if it is, entering step
Rapid 904, if not, entering step 905；
Step 904: conversion control circuit increases described first output valve, controls the resistance increasing described low-pass filter circuit
Value is to increase described analog voltage signal vrssiNumerical value；Enter step 905；
Step 905: judge analog voltage signal vrssiNumerical value whether be located at described threshold voltage high level vh and threshold value electricity
Force down in the voltage range of value vl determination, if it is, entering step 906, if not, entering step 901 or step 903；
Step 906: terminate.
In sum as can be seen that described self calibration flow process is just present to ensure that described analog voltage signal vrssiMaximum
Value is between described threshold voltage high level vh and described threshold voltage low value vl, so can ensure that input signal strength is surveyed
The effectiveness of amount, it is to avoid the process deviation and temperature impact to measurement result.
In the case that described input signal strength indicator includes programmable current mirror, can also pass through described programmable
Current mirror is changing analog current signal irssi, thus carrying out self calibration.In this case, the resistance value in low pass filter can
Not change, self calibration flow process includes: in analog voltage signal vrssiIn the case of threshold voltage high level vh, described conversion
Control circuit reduces the 3rd output valve, controls and reduces analog current signal irssiTo reduce described analog voltage signal vrssiNumber
Value；In described analog voltage signal vrssiIn the case of threshold voltage low value vl, described conversion control circuit increases described
3rd output valve, controls and increases analog current signal irssiTo increase described analog voltage signal vrssiNumerical value；Repeat institute
State self calibration flow process, until described analog voltage signal vrssiNumerical value be located at described threshold voltage high level vh and threshold voltage low
In the voltage range that value vl determines.
After step 802, enter step 803.
Step 803: execution input signal strength measurement procedure；
Wherein, described signal strength measurement flow process may include that described conversion control circuit is supervised by voltage comparator circuit
Survey analog voltage signal vrssi, as described analog voltage signal vrssiDuring less than threshold voltage low value vl, described conversion control circuit
Reduce the second output valve, control the electric current reducing described programmable current source to reduce threshold voltage；When described analog voltage letter
Number vrssiDuring more than threshold voltage high level vh, described conversion control circuit increases described second output valve, and controlling can described in increasing
The electric current in program current source is to increase threshold voltage；Until described analog voltage signal vrssiNumerical value be located at described threshold voltage
In the voltage range of high level vh and threshold voltage low value vl determination.
The detailed process of described input signal strength measurement procedure is similar to the concrete implementation procedure of above-mentioned self calibration flow process,
The output valve that simply described conversion control circuit controls is different.
1) conversion control circuit controls to adjust the output current of programmable current source by the second output valve, described compiles
The change of the output current of journey current source can be linear stepping, and that is, described conversion control circuit simply controls described every time
Two output valve plus or minus ones.Certainly, conversion control circuit controls to adjust the output of programmable current source by the second output valve
Electric current can also be realized by other algorithm, realizes for example with binary weights algorithm, real using binary weights algorithm
Existing step can be such that
By the second output valve dciThe (n-1)th bit be set to 1, other positions be 0, i.e. dci=2n-1, using voltage comparator circuit
Judged, if vrssi<vtl, then the (n-1)th bit be set to 0；When v is detectedrssi>vth, then the (n-1)th bit be set to 1；
By dciThe n-th -2 bit be set to 1, i.e. dci=dci+2n-2, judged using voltage comparator circuit, if vrssi<
vtl, the n-th -2 bit is set to 0；When v is detectedrssi>vth, then the n-th -2 bit be set to 1.
Determine d according to above step successivelyciThe value of remaining bit, when the value of the 0th bit determines, measurement terminates,
By doutIt is updated to 2n–1–dci.
Step 804: output numeral corresponding with input signal amplitude indication signal.
The digital indication signal of described conversion control circuit output and input signal amplitude are one-to-one, defeated in other words
It is one-to-one for entering signal amplitude with threshold voltage high level vh and voltage range determined by threshold voltage low value vl, in input
When signal amplitude changes, the input signal strength measurement procedure as described in step 803 will necessarily be experienced.
Each step of summary understands, when input signal amplitude is 0, described analog current signal irssiMaximum, and
Described analog voltage signal vrssiIt is in the maximum of range, the second output valve of described conversion control circuit will be set to maximum
2n- 1, and the digital indication signal of described conversion control circuit output this moment is 0；Described in meeting or exceeding when input signal amplitude
During the range upper limit of input signal strength indicator, the whole saturation of the amplitude limiter in described analog signal conversion, simulation electricity
Stream signal irssiFor 0, and analog voltage signal vrssiIt is in the minima of range, now the second of described conversion control circuit is defeated
Going out value is minima 0, and change-over circuit controls the digital signal exporting for maximum 2n-1.Described in being in when input signal amplitude
When in the measurement range of input signal strength indicator, the digital indication signal of conversion control circuit output has and only unique value
Correspond to therewith.
The error of the intensity measurements of input signal is directly proportional to the amplitude range of input signal, with described input signal
The series of volume indicator is inversely proportional to.The commutator that the series of wherein input signal strength indicator can include according to it
Number, to determine, such as includes 5 commutators, then described input signal strength indicator is just 5 grades of input signal strength indicator.
In the case of input signal amplitude scope identical, the series of input signal strength indicator is more, and the intensity of input signal is surveyed
Amount resultant error is less, and the series of therefore input signal strength indicator also determines quantization digit indirectly, that is, recited above
n.
In the present embodiment, the amplitude of input signal can be carried out quantification treatment by described input signal strength indicating means,
And export binary digital signal corresponding with input signal strength, to be simulated letter without special analog-digital converter
Number to digital signal conversion, thus also without the relation measuring in advance between input signal amplitude and output voltage, not only
Reduce cost and the structure complexity of input signal indicator, and also simplify the whole place of input signal strength indicator
Reason flow process.
In other examples, before the step exporting numeral indication signal corresponding with input signal amplitude, also may be used
Detect analog voltage signal v in m clock cycle to include conversion control circuitrssiWhether all in threshold voltage high level vh and
The step in voltage range that threshold voltage low value vl determines, if it is, enter export number corresponding with input signal amplitude
The step of word indication signal.Wherein, described m is positive integer.If continuous m clock all detects analog voltage signal vrssiAll
It is in the voltage range that highest threshold voltage and threshold voltage low value vl determine, then it is considered that input signal strength measurement
Conversion work has completed it is possible to export digital indication signal.
In this specification, each embodiment is described by the way of going forward one by one, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Also, it should be noted herein, such as first and second or the like relational terms are used merely to one
Entity or operation are made a distinction with another entity or operation, and not necessarily require or imply between these entities or operation
There is any this actual relation or order.And, term " inclusion ", "comprising" or its any other variant are intended to contain
Comprising of lid nonexcludability, wants so that including a series of process of key elements, method, article or equipment and not only including those
Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element that limited by sentence "including a ..." it is not excluded that
Also there is other identical element including in the process of described key element, method, article or equipment.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple modifications to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase one
The scope the widest causing.
Claims (12)
1. a kind of input signal strength indicator is it is characterised in that include:
Analog signal conversion, for being converted to corresponding analog current signal by input signal；Described analog current signal
Linearly negatively correlated with the range value of described input signal；
Low-pass filter circuit, for described analog current signal is carried out low-pass filtering treatment, and produces analog voltage signal；Institute
The parameter stating low-pass filter circuit is controlled by the first output valve of conversion control circuit；
Voltage comparator circuit, the threshold voltage for being produced described analog voltage signal with threshold voltage generation circuit is compared
Relatively, and export comparative result；
Threshold voltage generation circuit, for producing threshold voltage high level and threshold voltage low value；Described threshold voltage high level and institute
The voltage range stating the determination of threshold voltage low value is controlled by the second output valve of described conversion control circuit；
Conversion control circuit, exports the first output valve or for the voltage ratio according to described voltage comparator circuit compared with output control
Two output valves, and export numeral indication signal corresponding with input signal amplitude.
2. input signal strength indicator according to claim 1 is it is characterised in that described analog signal conversion bag
Include n amplitude limiter and n+1 commutator；Wherein, described amplitude limiter is used for for input signal entering line amplitude amplification, described commutator
For ac signal is converted to DC signal, the DC signal of each commutator output collects generation analog current letter
Number；Described n is positive integer.
3. input signal strength indicator according to claim 1 it is characterised in that described low-pass filter circuit one end with
The outfan of described analog signal conversion connects, and one end is grounded, programmable including the electric capacity and one being arranged in parallel
Resistance.
4. input signal strength indicator according to claim 1 is it is characterised in that described voltage comparator circuit includes
One comparison circuit and the second comparison circuit, it is high that described first comparison circuit is used for relatively described analog voltage signal and voltage threshold
Value, described second comparison circuit is used for relatively described analog voltage signal and voltage threshold low value.
5. input signal strength indicator according to claim 1 is it is characterised in that described threshold voltage generation circuit bag
Include programmable current source and two divider resistances being arranged in series；Described programmable current source is by the of described conversion control circuit
Two output valves control.
6. input signal strength indicator according to claim 1 is it is characterised in that also include:
The clock circuit being connected with described conversion control circuit, for providing clock signal for described conversion control circuit.
7. input signal strength indicator according to claim 1 is it is characterised in that also include:
One end is connected with the outfan of described analog signal conversion, and one end is programmable with what described conversion control circuit was connected
Current mirror, described programmable current mirror is controlled by the 3rd output valve of described conversion control circuit.
8. a kind of input signal strength indicating means, is applied to the input signal strength as described in any one of claim 1-7 and refers to
Show in device it is characterised in that including:
When described input signal amplitude is zero, the second output valve is set to maximum by conversion control circuit；
Conversion control circuit executes self calibration flow process；
Execution input signal strength measurement procedure；
Output numeral corresponding with input signal amplitude indication signal.
9. input signal strength indicating means according to claim 8 is it is characterised in that described self calibration flow process includes:
In the case that analog voltage signal is more than threshold voltage high level, described conversion control circuit reduces the first output valve, and control subtracts
The resistance value of little low-pass filter circuit is to reduce the numerical value of described analog voltage signal；It is less than threshold value in described analog voltage signal
In the case of voltage low value, described conversion control circuit increases described first output valve, controls and increases described low-pass filter circuit
The numerical value to increase described analog voltage signal for the resistance value；
Repeat described self calibration flow process, until the numerical value of described analog voltage signal is located at described threshold voltage high level and threshold
In the voltage range that threshold voltage low value determines.
10. input signal strength indicating means according to claim 8 is it is characterised in that described self calibration flow process includes:
In the case that analog voltage signal is more than threshold voltage high level, described conversion control circuit reduces the 3rd output valve, and control subtracts
Little analog current signal is to reduce the numerical value of described analog voltage signal；It is less than threshold voltage low value in described analog voltage signal
In the case of, described conversion control circuit increases described 3rd output valve, controls and increases analog current signal to increase described mould
Intend the numerical value of voltage signal；
Repeat described self calibration flow process, until the numerical value of described analog voltage signal is located at described threshold voltage high level and threshold
In the voltage range that threshold voltage low value determines.
11. input signal strength indicating means according to claim 8 are it is characterised in that described input signal strength is surveyed
Amount flow process includes:
Described conversion control circuit monitors analog voltage signal by voltage comparator circuit, when described analog voltage signal is less than
During threshold voltage low value, described conversion control circuit reduces the second output valve, controls the electric current reducing programmable current source to subtract
Little threshold voltage；When described analog voltage signal is more than threshold voltage high level, described conversion control circuit increases described second
Output valve, controls the electric current increasing described programmable current source to increase threshold voltage；Until the number of described analog voltage signal
Value is located in the voltage range that described threshold voltage high level and threshold voltage low value determine.
12. input signal strength indicating means according to claim 8 are it is characterised in that exporting and input signal width
Before degree corresponding numeral indication signal, also include:
In the conversion control circuit m clock cycle of detection, whether analog voltage signal is all in threshold voltage high level and threshold voltage
In the voltage range that low value determines, if it is, the step entering output numeral corresponding with input signal amplitude indication signal；
Described m is positive integer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310446095.5A CN103516366B (en) | 2013-09-26 | 2013-09-26 | Input signal intensity indicator and indicating method |
Applications Claiming Priority (1)
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| WO1993026110A1 (en) * | 1992-06-10 | 1993-12-23 | At & T Wireless Communications Products Ltd. | Dc tracking circuit for ginomy data slicer |
| CN101354412A (en) * | 2008-08-28 | 2009-01-28 | 深圳华为通信技术有限公司 | Apparatus for testing electromagnetic radiation strength |
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| WO1993026110A1 (en) * | 1992-06-10 | 1993-12-23 | At & T Wireless Communications Products Ltd. | Dc tracking circuit for ginomy data slicer |
| CN101354412A (en) * | 2008-08-28 | 2009-01-28 | 深圳华为通信技术有限公司 | Apparatus for testing electromagnetic radiation strength |
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Address after: 215347 7th floor, IIR complex, 1699 Weicheng South Road, Kunshan City, Suzhou City, Jiangsu Province Patentee after: Kunshan Microelectronics Technology Research Institute Address before: 215347 905, complex building, No. 1699, Weicheng South Road, Kunshan City, Suzhou City, Jiangsu Province Patentee before: KUNSHAN BRANCH, INSTITUTE OF MICROELECTRONICS OF CHINESE ACADEMY OF SCIENCES |