CN109976436A - Voltage detector and telecommunication circuit - Google Patents
Voltage detector and telecommunication circuit Download PDFInfo
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- CN109976436A CN109976436A CN201711444362.XA CN201711444362A CN109976436A CN 109976436 A CN109976436 A CN 109976436A CN 201711444362 A CN201711444362 A CN 201711444362A CN 109976436 A CN109976436 A CN 109976436A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is dc
- G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
- G05F3/26—Current mirrors
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- Microelectronics & Electronic Packaging (AREA)
- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of voltage detector and telecommunication circuits, are able to detect that lower input voltage compared to the prior art, and the result of above-mentioned detection can be used as the foundation of circuit parameter adjustment, hurt late-class circuit to avoid excessively high input voltage.One embodiment of the voltage detector includes: an ac-coupled circuit, is used to generate one first input voltage and one second input voltage according to an input voltage；One feedback amplifier exports a shunt current for drawing electric current according to one, and the amount according to first input voltage and the shunt current determines an output voltage；And an auxiliary circuit, for determining that this draws the amount of electric current according to second input voltage, it includes the shunt current that wherein this, which draws electric current,.The output voltage also can extraly rise according to the increase of the shunt current, this technical characteristic makes the output voltage and the slope of the variation of the ratio of the input voltage become larger, and is conducive to detect in addition to rising according to the rising of first input voltage.
Description
Technical field
The present invention relates to voltage detectors and telecommunication circuit, more particularly to are able to detect that the voltage detecting of low input
Device and telecommunication circuit.
Background technique
One gain of general radio communication circuit meeting foundation (such as low noise noise amplifier (low noise
Amplifier, LNA) gain) amplify reception signal, to generate input signal for late-class circuit processing, however, if input
Signal is excessive, which may hurt late-class circuit, and therefore, in order to avoid the above problem, the radio communication circuit is logical
It often include a voltage detector, to detect the voltage of input signal whether more than a threshold voltage, if testing result is yes, the nothing
Line telecommunication circuit can reduce the gain.
Fig. 1 shows the voltage V of above-mentioned input signalIN, output signal voltage VOUTAnd threshold voltage VTHRelationship.
As shown in Figure 1, working as VINGreater than voltage V1When, VOUTV can be greater thanTH.However, with the development of technology, the operation complexity of circuit is cured
Come higher, the detectability of aforesaid voltage detector must be promoted further, to detect than voltage V1Lower voltage changes speech
It, in VINLess than voltage V1When (as shown in Fig. 2, wherein V2V less than Fig. 11), voltage detector must obtain VOUTGreater than VTH
Testing result, can meet demand.
Summary of the invention
A purpose of the present invention is that providing a kind of voltage detector and a kind of telecommunication circuit, compared to the prior art can
Lower input voltage is enough detected, in favor of immediately adjustment circuit parameter, so that excessively high input voltage be avoided to hurt
Late-class circuit.
The invention discloses a kind of voltage detectors.One embodiment of the voltage detector include an ac-coupled circuit,
One feedback amplifier and an auxiliary circuit.The ac-coupled circuit is used to generate one first input according to an input voltage
Voltage and one second input voltage.The feedback amplifier, which is used to draw electric current according to one, exports a shunt current, and according to this
The amount of first input voltage and the shunt current determines an output voltage, wherein when the shunt current is greater than zero, shunting electricity
Stream is proportional to this and draws electric current, therefore the amount for drawing electric current will affect the output voltage.The auxiliary circuit be used to according to this
Two input voltages determine that this draws the amount of electric current, and it includes the shunt current that wherein this, which draws electric current,.In above-described embodiment, the output
Voltage also can draw the increase of electric current according to this and rise in addition to meeting rises according to the rising of first input voltage, therefore phase
Compared with the prior art, under same input voltage, output voltage of the invention is higher, and is conducive to detect.
The present invention separately discloses a kind of telecommunication circuit, and one embodiment compares comprising a radio circuit, a voltage detector, one
Circuit and a gain adjustment circuit.The radio circuit is used to receive signal according to amplifier gain processing one, to generate one
Input voltage.The voltage detector includes: an ac-coupled circuit, is used to generate one first input voltage according to the input voltage
With one second input voltage；One feedback amplifier, for according to one draw electric current export a shunt current, and according to this first
The amount of input voltage and the shunt current determines an output voltage；And an auxiliary circuit, it is used to according to second input voltage
Determine that this draws the amount of electric current, it includes the shunt current that wherein this, which draws electric current,.The comparison circuit is used to compare the output voltage
With a threshold voltage, to export a voltage detecting result.The gain adjustment circuit is used to should according to voltage detecting result adjustment
Amplifier gain.
Feature, implementation and effect for the present invention, hereby attached drawing being cooperated to make preferred embodiment, detailed description are as follows.
Detailed description of the invention
[Fig. 1] shows the effect of the voltage detecting of the prior art；
[Fig. 2] shows the effect of voltage detecting of the invention；
[Fig. 3] shows an embodiment of voltage detector of the invention；
[Fig. 4] shows an embodiment of the ac-coupled circuit of Fig. 3；
[Fig. 5] shows an embodiment of bias generating circuit of the invention；
[Fig. 6] shows an embodiment of the feedback amplifier of Fig. 3；
[Fig. 7] shows another embodiment of the feedback amplifier of Fig. 3；
[Fig. 8] shows an embodiment of the auxiliary circuit of Fig. 3；
[Fig. 9] shows the current source of Fig. 8 and an embodiment of current slot；And
[Figure 10] shows an embodiment of telecommunication circuit of the invention.
Description of symbols:
VINThe voltage of input signal
VOUTThe voltage of output signal
VTHThreshold voltage
V1、V2Voltage
300 voltage detectors
310 ac-coupled circuits
320 feedback amplifiers
330 auxiliary circuits
VIP、VINInput voltage
VIP1、VIN1First input voltage
VIP2、VIN2Second input voltage
ISINKDraw electric current
IBRANCHShunt current
410 first nodes
420 second nodes
430 first ac-coupled circuits
440 second ac-coupled circuits
VBIAS1First bias
VBIAS2Second bias
500 bias generating circuits
510 bias current sources
520 bias current mirrors
530 diode-connected transistors
VDDHigh potential
IREFReference current
IMIRRORMirrored current
VBIAS3Third bias
610 first voltage input circuits
620 current mirroring circuits
630 output circuits
640 bias circuits
650 output nodes
IONConducting electric current
I1First electric current
I2Second electric current
VBIASBias
710 first voltage input circuits
720 current mirroring circuits
730 output feed circuits
740 bias circuits
750 output nodes
VOUT1First output voltage
810 current sources
820 current slots
IB1Scheduled current
910 second voltage input circuits
1000 telecommunication circuits
1010 radio circuits
1020 voltage detectors
1030 comparison circuits
1040 gain adjustment circuits
Specific embodiment
The present invention includes voltage detector and telecommunication circuit, is able to detect that lower input electricity compared to the prior art
Pressure, in favor of immediately adjustment circuit parameter, so that excessively high input voltage be avoided to hurt late-class circuit.Fig. 2 shows this hair
Bright beneficial effect, in Fig. 2, VINIt is the voltage of input signal, VOUTIt is the voltage of output signal, VTHIt is threshold voltage, works as VIN
Greater than voltage V2When, VOUTV can be greater thanTH, this indicates VINMay be excessively high, circuit parameter can be correspondingly adjusted to reduce at this time
VIN.The voltage V of Fig. 1 compared to the prior art, Fig. 22Less than voltage V1, it means that the present invention be able to detect that it is lower defeated
Enter voltage.
Fig. 3 shows an embodiment of voltage detector of the invention.As shown in figure 3, voltage detector 300 includes an exchange
Coupling circuit 310, a feedback amplifier 320 and an auxiliary circuit 330.Ac-coupled circuit 310 is used to according to input electricity
Press VIGenerate the first input voltage VI1With the second input voltage VI2, wherein input voltage VI, the first input voltage VI1It is defeated with second
Enter voltage VI2It is in this present embodiment differential voltage, that is, input voltage VIFor the voltage V of differential waveIP、VIN, it is first defeated
Enter voltage VI1For the voltage V of differential waveIP1、VIN1And the second input voltage VI2For the voltage V of differential waveIP2、VIN2, so
The implementation of this and non-present invention limitation.As input voltage VIGreater than V in Fig. 22When, feedback amplifier 320 is used to draw according to one
Electric current ISINKExport a shunt current IBRANCHAs drawing electric current ISINKA part, feedback amplifier 320 and according to first
Input voltage VIP1、VIN1With shunt current IBRANCHAmount determine an output voltage VOUT.Auxiliary circuit 330 is used to defeated according to second
Enter voltage VIP2、VIN2Electric current I is drawn in decisionSINKAmount, wherein as shunt current IBRANCHWhen greater than zero, electric current I is drawnSINKInclude
Shunt current IBRANCH, and shunt current IBRANCHIt is proportional to and draws electric current ISINK, therefore, when drawing electric current ISINKWith second defeated
Enter voltage VIP2、VIN2Rise (that is, | VIP2-VIN2| become larger) and when increasing, shunt current IBRANCHAlso it will increase, to export electricity
Press VOUTExcept according to the first input voltage VIP1、VIN1Rising (that is, | VIP1-VIN1| become larger) and rise it is outer, also can extraly according to
According to shunt current IBRANCHIncrease and rise, this makes output voltage VOUTVariable quantity (Δ VOUT) and input voltage VIP、VIN
Variable quantity (Δ | VIP-VIN|) ratio (i.e.) the slope of variation become larger, and be conducive to detect.In attached drawing, connect
Ground symbology is connected to a low potential VSS(such as: earthing potential).
Fig. 4 shows an embodiment of the ac-coupled circuit 310 of Fig. 3.As shown in figure 4, ac-coupled circuit 310 includes one
First node 410, a second node 420, one first ac-coupled circuit 430 and one second ac-coupled circuit 440.The
One node 410 is used to receive anode input (positive-terminal input) V of aforementioned input voltageIP.Second node
420 are used to receive cathode input (negative-terminal input) V of aforementioned input voltageIN.First ac-coupled circuit
430 include capacitor and resistance, for filtering out dc component and inputting V according to anodeIP, cathode input VINWith one first bias
VBIAS1Generate aforementioned first input voltage VIP1、VIN1.Second ac-coupled circuit 440 includes capacitor and resistance, for filtering out directly
It flows composition and inputs V according to anodeIP, cathode input VINWith one second bias VBIAS2Generate aforementioned second input voltage VIP2、
VIN2。
Aforementioned first bias VBIAS1It can be determined by implementer according to its demand, the second bias VBIAS2It can then be generated by a bias
Circuit provides.One embodiment of the bias generating circuit is as shown in figure 5, the bias generating circuit 500 of Fig. 5 couples a high potential
VDDWith a low potential VSS, include a bias current source 510, a bias current mirror 520 and a diode connection (diode-
Connected) transistor 530.Bias current source 510 is used to determine a reference current IREF, and other circuit (such as Fig. 5 can be coupled
The dotted line that is connected of bias current source 510 shown in).Bias current mirror 520 is used to generate a mirrored current IMIRRORIt is relevant to ginseng
Examine electric current IREF, wherein the grid voltage of bias current mirror 520 can be used as the second bias VBIAS2.Mirrored current IMIRRORFlow through two poles
Pipe linking transistor 530, the grid voltage of diode-connected transistor 530 can be used as aftermentioned third bias VBIAS3.It is worth
It is noted that the circuit framework according to Fig. 5, third bias VBIAS3With the second bias VBIAS2A ratio can be fixed
(constant) or (configurable) (such as: bias current mirror 520 is an adjustable current mirror) that can set.
Fig. 6 shows an embodiment of the feedback amplifier 320 of Fig. 3.As shown in fig. 6, feedback amplifier includes 320 packets
Containing a first voltage input circuit 610, a current mirroring circuit 620, an output circuit 630 and a bias circuit 640.Currently
State input voltage VIGreater than V in Fig. 22When, first voltage input circuit 610 is used to according to first input voltage VIP1、VIN1Electricity
Pressure pendulum volt is to change the conducting electric current I for flowing through first voltage input circuit 610ON.Current mirroring circuit 620 couples output node
650, for ensuring the second electric current I2With first electric current I1A ratio be it is fixed or can set (such as: current mirroring circuit
620 be adjustable current mirror), the first electric current I1Include aforementioned shunt current IBRANCHWith conducting electric current ION, shunt current IBRANCH
Via the output of node 650 to auxiliary circuit 330；Aforementioned output voltage VOUTWith the second electric current I2It is directly proportional.630 coupling of output circuit
Current mirroring circuit 620 is connect, is used to according to the second electric current I2Determine output voltage VOUT.Bias circuit 640 couples first voltage input
Circuit 610 and output circuit 630 are used to according to bias VBIASWith running, bias VBIASIt can be determined by implementer according to its demand.
Fig. 7 shows another embodiment of the feedback amplifier 320 of Fig. 3.As shown in fig. 7, feedback amplifier includes 320
Include a first voltage input circuit 710, a current mirroring circuit 720, one output feed circuit 730 and a bias circuit
740.As aforementioned input voltage VIGreater than V in Fig. 22When, first voltage input circuit 710 is used to first defeated according to this according to aforementioned
Enter voltage VIP1、VIN1Voltage swing lie prostrate to change the conducting electric current I for flowing through first voltage input circuit 710ON.Current mirroring circuit
720 coupling output nodes 750, for ensuring the second electric current I2With first electric current I1A ratio be fixed or can set
(such as: current mirroring circuit 720 is adjustable current mirror), the first electric current I1Include aforementioned shunt current IBRANCHWith conducting electric current
ION, shunt current IBRANCHVia the output of node 750 to auxiliary circuit 330.It exports feed circuit 730 and couples current mirroring circuit
720, for determining 750 voltage V of output nodeOUT1And according to the second electric current I2Export output voltage VOUT.Bias circuit 740 couples
First voltage input circuit 710 and output feed circuit 730, are used to according to bias VBIASWith running, bias VBIASIt can be by implementer
It is determined according to its demand.It is known circuit for the feedback amplifier 320 of Fig. 7 is independent.
Fig. 8 shows an embodiment of the auxiliary circuit 330 of Fig. 3.As shown in figure 8, auxiliary circuit 330 includes a current source
(current source) 810 and current slot (current sink) 820.Current source 810 is used to export a scheduled current
IB1, which is fixed or (such as: current source 810 is an adjustable current source) that can set.Current slot 820 is used to
It extracts and aforementioned draws electric current ISINK, draw electric current ISINKInclude scheduled current IB1With aforementioned shunt current IBRANCH；And IBRANCHWith
Second input voltage VIP2、VIN2It is positively correlated
Fig. 9 shows the current source 810 of Fig. 8 and an embodiment of current slot 820.As shown in figure 9, current source 810 includes one
Transistor is used to according to aforementioned third bias VBIAS3I is providedB1；Current slot 820 is a second voltage input circuit 910, is used to
According to the second input voltage VIP2、VIN2Electric current I is drawn in decisionSINKAmount.It is worth noting that, the disclosure according to Fig. 5, third are inclined
Press VBIAS3With the second bias VBIAS2Ratio can be fixed or can set, therefore, by controlling the ratio, work as input
Voltage VIP、VINWhen a not up to threshold (such as: | VIP-VINThe voltage V of |≤Fig. 22), shunt current IBRANCHIt is similar to zero, draws
Obtaining current ISINKSubstantially equal to scheduled current IB1(that is, ISINK=IB1+IBRANCH=IB1+ 0=IB1)；As input voltage VIP、VIN
When reaching the threshold, electric current I is drawnSINKInclude scheduled current IB1And shunt current IBRANCH(that is, ISINK=IB1+IBRANCH)。
Figure 10 shows an embodiment of telecommunication circuit of the invention.As shown in Figure 10, telecommunication circuit 1000 includes a radio frequency
Circuit 1010, a voltage detector 1020, a comparison circuit 1030, a gain adjustment circuit 1040.Radio circuit 1010 is used to
One amplifier gain of foundation (such as: the gain of low-noise amplifier (low noise amplifier, LNA)) handle a reception
Signal, to generate an input voltage.Voltage detector 1020 is the voltage detector 300 or its equalization of Fig. 3.Comparison circuit 1030
For the output voltage and a threshold voltage of comparison voltage detector 300, to export a voltage detecting result.Gain adjustment circuit
1040 (such as: baseband circuit) it is used to adjust the amplifier gain according to the voltage detecting result, more particularly, when the voltage
Testing result points out that the input voltage is greater than a threshold voltage, and gain adjustment circuit 1040 downgrades the amplifier gain.Ability
Field technique personnel can understand, above-mentioned radio circuit 1010, comparison circuit 1030 and gain adjustment circuit 1040 each
It can be known circuit for individually.
It is worth noting that, under the premise of being embodied as possible, before those skilled in the art of the present technique optionally implement
Part or all technical features in any embodiment are stated, or selectively implement part or all of technology in aforesaid plurality of embodiment
The combination of feature increases the elasticity when present invention is implemented whereby.Though separately note that previous embodiment with the voltage of differential wave
For processing, those skilled in the art can understand, and by the way that differential circuit framework is changed to single-end circuit framework, the present invention also may be used
The processing of voltage for single-ended signal.
In conclusion voltage detector of the invention be able to detect that compared to the prior art with telecommunication circuit it is lower defeated
Enter voltage, with immediately adjustment circuit parameter, so that excessively high input voltage be avoided to hurt late-class circuit.
Although the embodiment of the present invention is as described above, however those embodiments not are used to limit the present invention, this technology neck
The content that field technique personnel can express or imply according to the present invention imposes variation to technical characteristic of the invention, all this kind change
Change may belong to patent protection scope sought by the present invention, and in other words, scope of patent protection of the invention must regard this explanation
Subject to the as defined in claim of book.
Claims (10)
1. a kind of voltage detector, includes:
One ac-coupled circuit is used to generate one first input voltage and one second input voltage according to an input voltage；
One feedback amplifier exports a shunt current for drawing electric current according to one, and according to first input voltage and is somebody's turn to do
The amount of shunt current determines an output voltage；And
One auxiliary circuit, for determining that this draws the amount of electric current according to second input voltage, it includes to be somebody's turn to do that wherein this, which draws electric current,
Shunt current.
2. voltage detector as described in claim 1, wherein the input voltage, first input voltage and second input are electric
Pressure is differential voltage, which includes:
One first node, for receiving an anode input of the input voltage；
One second node, for receiving the cathode input of the input voltage；
One first ac-coupled circuit, it is first defeated for generating this with one first bias according to anode input, cathode input
Enter voltage；And
One second ac-coupled circuit, it is second defeated for generating this with one second bias according to anode input, cathode input
Enter voltage.
3. voltage detector as claimed in claim 2, wherein the auxiliary circuit includes:
One current source, for exporting a scheduled current；And
One current slot draws electric current for extracting this, and it includes the scheduled current and the shunt current that this, which draws electric current,.
4. voltage detector as claimed in claim 3, wherein the current slot includes: a second voltage input circuit, be used to according to
Determine that this draws the amount of electric current according to second input voltage.
5. voltage detector as claimed in claim 3, wherein the current source exports the scheduled current according to a third bias, and
One ratio of the third bias and second bias is fixed or can set.
6. voltage detector as described in claim 1, wherein the feedback amplifier includes:
One first voltage input circuit, for determining one first output voltage of an output node according to first input voltage,
And determine to flow through a conducting electric current of the first voltage input circuit according to first input voltage；
One current mirroring circuit couples the output node, is used to generate one first electric current according to first output voltage, first electricity
Stream includes the shunt current and the conducting electric current；And
One output feed circuit, couples the current mirroring circuit, for generating the output voltage.
7. voltage detector as described in claim 1, wherein the auxiliary circuit includes:
One current source, for exporting a scheduled current；And
One current slot draws electric current for extracting this according to second input voltage, this draw electric current include the scheduled current with
The shunt current.
8. voltage detector as claimed in claim 7, wherein the current slot includes: a second voltage input circuit, be used to according to
Determine that this draws the amount of electric current according to second input voltage.
9. a kind of telecommunication circuit, includes:
One radio circuit is used to receive signal according to amplifier gain processing one, to generate an input voltage；
One voltage detector includes:
One ac-coupled circuit is used to generate one first input voltage and one second input voltage according to the input voltage；
One feedback amplifier exports a shunt current for drawing electric current according to one, and according to first input voltage and is somebody's turn to do
The amount of shunt current determines an output voltage；And
One auxiliary circuit, for determining that this draws the amount of electric current according to second input voltage, it includes to be somebody's turn to do that wherein this, which draws electric current,
Shunt current；
One comparison circuit, for comparing the output voltage and a threshold voltage, to export a voltage detecting result；And
One gain adjustment circuit, for adjusting the amplifier gain according to the voltage detecting result.
10. telecommunication circuit as claimed in claim 9, wherein the auxiliary circuit includes:
One current source, for exporting a scheduled current；And
One current slot draws electric current for extracting this according to second input voltage, this draw electric current include the scheduled current with
The shunt current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711444362.XA CN109976436B (en) | 2017-12-27 | 2017-12-27 | Voltage detector and communication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711444362.XA CN109976436B (en) | 2017-12-27 | 2017-12-27 | Voltage detector and communication circuit |
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| Publication Number | Publication Date |
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| CN109976436A true CN109976436A (en) | 2019-07-05 |
| CN109976436B CN109976436B (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711444362.XA Active CN109976436B (en) | 2017-12-27 | 2017-12-27 | Voltage detector and communication circuit |
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| CN1723604A (en) * | 2003-06-06 | 2006-01-18 | 密克罗奇普技术公司 | IC apparatus for monitoring power supply |
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| Publication number | Publication date |
|---|---|
| CN109976436B (en) | 2021-03-23 |
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