CN108768326A - Fine gain step size controlling amplifier and navigation neceiver - Google Patents
Fine gain step size controlling amplifier and navigation neceiver Download PDFInfo
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- CN108768326A CN108768326A CN201811016384.0A CN201811016384A CN108768326A CN 108768326 A CN108768326 A CN 108768326A CN 201811016384 A CN201811016384 A CN 201811016384A CN 108768326 A CN108768326 A CN 108768326A
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45376—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using junction FET transistors as the active amplifying circuit
- H03F3/45381—Long tailed pairs
- H03F3/4539—Folded cascode stages
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45396—Indexing scheme relating to differential amplifiers the AAC comprising one or more switches
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Abstract
The present invention provides a kind of Fine gain step size controlling amplifier and navigation neceivers, are related to navigation neceiver technical field, including control switch, differential amplification module, current source and output loading；One end of differential amplification module is connected with one end of output loading, another termination power of output loading, the other end of differential amplification module is connected with one end of control switch, the other end of control switch is connected with one end of current source, the other end of current source is grounded, wherein, differential amplification module includes two differential amplifier circuits；In the case where keeping output loading current source constant, by controlling the on off state of switch, the conducting state of differential amplifier circuit in differential amplification module is controlled, to reach preset gain value, by the way of differential pair, realizes that gain is precisely controllable.
Description
Technical field
The present invention relates to navigation neceiver technical fields, more particularly, to a kind of Fine gain step size controlling amplifier and lead
Navigate receiver.
Background technology
With China's independent research Beidou satellite navigation system continuous development with it is perfect, domestic market is defended applied to the Big Dipper
The demand of the terminal radio frequency chip of star navigation is more and more stronger, and the transponder chip of high-performance high integration already becomes research
One of hot spot.Wireless radio frequency receivers are mainly by antenna, low-noise amplifier, frequency mixer, low-pass filter, automatic growth control
The function modules such as circuit (AGC) form.The effect of AGC is the gain size of receiver system with input radio frequency signal strength
Variation is capable of the signal of adjust automatically and then receiver output firm power to base band.The core circuit of AGC is put for variable gain
Big device, adjustable gain range directly decide the input signal dynamic range that AGC can be handled, further decide receiver
Sensitivity.With the raising of technique and design skill, high-gain, broadband, low pressure, low-power consumption and small area are that variable gain is put
The development trend of big device.
The control amplifier extensive use of digital controlled gain in current Novel design scheme, the closed loop amplification with amplifier
Although device can obtain more accurately gain, the matching of design of feedback resistance difficulty, and need high-gain, high bandwidth, high-performance
Operational amplifier, such operational amplifier take power consumption expense area, the market demand of miniaturization and low-power consumption cannot be met.
Invention content
In view of this, the purpose of the present invention is to provide Fine gain step size controlling amplifier and navigation neceiver, use
The mode of differential pair realizes that gain is precisely controllable.
In a first aspect, an embodiment of the present invention provides a kind of Fine gain step size controlling amplifiers, including：Control switch,
Differential amplification module, current source and output loading；
One end of the differential amplification module is connected with one end of the output loading, the other end of the output loading
Power supply is connect, the other end of the differential amplification module is connected with one end of the control switch, and the control switchs another
End is connected with one end of the current source, the other end ground connection of the current source, wherein the differential amplification module includes two
A differential amplifier circuit；
In the case where keeping the output loading current source constant, the on off state switched by the control,
The conducting state for controlling differential amplifier circuit described in the differential amplification module, to reach preset gain value.
With reference to first aspect, an embodiment of the present invention provides the first possible embodiments of first aspect, wherein institute
It is 0.5dB to state preset gain value.
With reference to first aspect, an embodiment of the present invention provides second of possible embodiments of first aspect, wherein institute
It includes that the first control switch and the second control switch to state control switch；
The differential amplifier circuit is controlled respectively and is led by the first control switch and the second control switch
Break-make is opened, and the first turning circuit and the second turning circuit is formed, to reach the preset gain value, wherein first conducting
The grid width ratio of circuit and second turning circuit is 1.122.
With reference to first aspect, an embodiment of the present invention provides the third possible embodiments of first aspect, wherein institute
It includes that the first difference being connected respectively with the first control switch and the second control switch is put to state differential amplification module
Big circuit and the second differential amplifier circuit, wherein the on off state of the first control switch and the second control switch
On off state is opposite；
When the first control switch first differential amplifier circuit of control is closed, described in the second control switch control
Second differential amplifier circuit disconnects, and first turning circuit is first differential amplifier circuit；When first control is opened
When closing control the first differential amplifier circuit disconnection, the second control switch controls second differential amplifier circuit and is closed, institute
It is second differential amplifier circuit to state the second turning circuit.
With reference to first aspect, an embodiment of the present invention provides the 4th kind of possible embodiments of first aspect, wherein institute
It includes that the first difference being connected respectively with the first control switch and the second control switch is put to state differential amplification module
Big circuit and the second differential amplifier circuit；
When the first control switch first differential amplifier circuit of control is closed, the second control switch control described the
When two differential amplifier circuits are closed, first turning circuit is first differential amplifier circuit and second difference channel
It is in parallel；When the first control switch first differential amplifier circuit of control is closed, the second control switch control described the
When two differential amplifier circuits disconnect, second turning circuit is first differential amplifier circuit.
With reference to first aspect, an embodiment of the present invention provides the 5th kind of possible embodiments of first aspect, wherein logical
It crosses the control switch control differential amplifier circuit and carries out conducting disconnection, form the first turning circuit and the second electric conduction
Road, to reach the preset gain value, wherein the grid index ratio of first turning circuit and second turning circuit is
1.122。
With reference to first aspect, an embodiment of the present invention provides the 6th kind of possible embodiments of first aspect, wherein institute
It includes the first differential amplifier circuit and the second differential amplifier circuit to state differential amplification module, and the control switchs and described second is poor
Amplifying circuit is divided to be connected；
When the control, which switchs the second differential amplifier circuit of control, to be closed, first turning circuit is described first poor
Amplifying circuit and second differential amplifier circuit is divided to be in parallel；It is disconnected when the control switchs the second differential amplifier circuit of control
When, second turning circuit is first differential amplifier circuit, wherein the grid index round numbers, first conducting
The grid index ratio of circuit and second turning circuit is 9: 8.
With reference to first aspect, an embodiment of the present invention provides the 7th kind of possible embodiments of first aspect, wherein institute
It includes the field-effect tube that two common sources are total to output loading, the grid input letter of two field-effect tube to state differential amplifier circuit
Number.
With reference to first aspect, an embodiment of the present invention provides the 8th kind of possible embodiments of first aspect, wherein institute
It includes the first output loading and the second output loading to state output loading, and first output loading and first differential amplification are electric
Road is connected, and second output loading is connected with second differential amplifier circuit.
Second aspect, the embodiment of the present invention also provide a kind of navigation neceiver, including Fine gain step-length as described above
Control amplifier.
An embodiment of the present invention provides a kind of Fine gain step size controlling amplifier and navigation neceivers, using differential pair control
Mode processed, output loading and current source, avoid traditional closed-loop amplifier resistance difficulty from matching altogether, and the larger drawback of loss area is led to
The folding condition for crossing the control switch being connect with differential amplifier circuit controls the conducting shutdown of differential amplifier circuit, to reach pre-
It is relatively simple if yield value, in the case where not changing load and power supply, realize accurate gain.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification
It obtains it is clear that understand through the implementation of the invention.The purpose of the present invention and other advantages are in specification, claims
And specifically noted structure is realized and is obtained in attached drawing.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment cited below particularly, and coordinate
Appended attached drawing, is described in detail below.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is that traditional closed-loop provided in an embodiment of the present invention controls amplifier architecture schematic diagram；
Fig. 2 is one of Fine gain step size controlling amplifier architecture schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the two of Fine gain step size controlling amplifier architecture schematic diagram provided in an embodiment of the present invention；
Fig. 4 is the three of Fine gain step size controlling amplifier architecture schematic diagram provided in an embodiment of the present invention；
Fig. 5 is three simulation waveform of Fine gain step size controlling amplifier architecture schematic diagram provided in an embodiment of the present invention
Figure.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
Currently, the traditional design scheme of variable gain amplifier is to control gain by controlling the analog voltage of amplifier
(VGA, variable gain amplifier), program Imitating voltage are continuous gradual at any time, be adjusted to required analog voltage when
Between be not only not fixed but also related with gain variation value, in addition, control terminal often also needs to plus larger filter capacitor, in capacitance
It sets, chip area can be increased, capacitance is external, needs to increase pin, is not suitable for miniaturization, and novel design scheme is to pass through
Digital form controls amplifier gain (PGA), although its control word is discrete saltus step, what transformation period was usually fixed,
With controllability, and filter capacitor is saved in digital form control, as chip is towards the direction of large-scale integrated and deep-submicron
Development, PGA increasingly become trend.But because control word is discrete, there is very high requirement to the control accuracy of PGA.
Under normal circumstances, for PGA the most commonly used is the close loop negative feedback structure with amplifier, Fig. 1 is closing with operational amplifier
Ring gaining structure is obtained by controlling switchIn order to realize more accurate gain, one side two
The size disparity of a resistance value is larger, and resistance is bad to be controlled and be not easy to match.On the other hand it needs to design a high-gain, Gao Kuan
The high performance operational amplifier of band, low noise and low distortion compares and accounts for area and expense power consumption, and this cost can be with PGA bandwidth
It is required that raising and steeply rise, very be not suitable for low-power consumption miniaturization application market in particular for big bandwidth PGA when,
The power consumption and area of amplifier can biggers.
In the design scheme of digital controlled gain, although the closed loop amplifier with amplifier can obtain more accurately gain,
But design of feedback resistance difficulty matches, and need high-gain, high bandwidth, high performance operational amplifier, such operation amplifier
Device takes power consumption expense area, cannot meet the market demand of miniaturization and low-power consumption.
Based on this, a kind of Fine gain step size controlling amplifier and navigation neceiver provided in an embodiment of the present invention can be with
By the way of differential pair, realize that gain is precisely controllable.
It is described in detail below by embodiment.
Fig. 1 is that traditional closed-loop provided in an embodiment of the present invention controls amplifier architecture schematic diagram.
Shown in referring to Fig.1, a kind of closed loop amplifier with operational amplifier is enough in the gain of operational amplifier (OPA)
In the case of big, when the switch is closed, closed loop gain AV1=-R2/R1, when the switches are opened, closed loop gain AV2=-R2/
(R1+R0), gain is characterized with dB under normal conditions, and the closed loop gain obtained by above two on off state is calculatedTo realize the VGA of preset gain value 0.5dB precision provided in an embodiment of the present invention, then R0/
R1Value be 0.0592.R0And R1Size difference it is larger, resistance is not easy to match.The gain of operational amplifier wants sufficiently large, and one
As need using be at least two-stage multistage amplifier circuits realize.The acquisition of high-gain is on the one hand so that corresponding bandwidth becomes
It is narrow, it on the other hand can make the area of final circuit that can become larger, it is impracticable in practical application.
Under normal circumstances, the gain (Gain) of amplifier can be expressed as：Gain=gmR；
Wherein,Here gmIt is expressed as gain amplification quantity, that is,
Gain is generally weighed with dB, therefore gain is also denoted as Av=20log10(gmR), obtainIt can be seen that gain is influenced by many parameters from the expression formula, including electronics moves
Shifting rate μn, capacitance Cox, electric current I, grid length L, grid width W and load R can not be smart since these parameters change with flow-route and temperature
Really control；
Here, load R indicates different resistance values, including R according to the closure and off state of switch1、R0+R1；
To solve the above-mentioned problems, a kind of by the way of differential pair, the accurate controllable Fine gain of realization gain is provided
Step size controlling amplifier；
Fine gain step size controlling amplifier provided in an embodiment of the present invention, including：Control switch, differential amplification module,
Current source and output loading；
One end of differential amplification module is connected with one end of output loading, another termination power vd D of output loading, poor
The other end of amplification module is divided to be connected with one end of control switch, the other end for controlling switch is connected with one end of current source
It connects, the other end ground connection of current source, wherein differential amplification module includes two differential amplifier circuits；
In the case where keeping output loading current source constant, by controlling the on off state of switch, differential amplification is controlled
The conducting state of differential amplifier circuit in module, to reach preset gain value.
Specifically, the embodiment of the present invention uses differential pair control mode, and output loading and current source, avoid traditional closed-loop altogether
Amplifier resistance difficulty matches, and the larger drawback of loss area passes through the folding shape for the control switch being connect with differential amplifier circuit
State controls the conducting shutdown of differential amplifier circuit, relatively simple to reach preset gain value, is not changing load and power supply
In the case of, realize accurate gain；
Further, in order to realize preset gain value be 0.5dB, circuit structure through the embodiment of the present invention, by difference
Amplifying circuit carries out the setting of resistance value, fixed current size in advance, by the adjusting of grid width, the change of control gain value, only
Consider single parameter, the accuracy of yield value is furthermore achieved.
Wherein, control switch includes that the first control switch and the second control switch；Pass through the first control switch and the second control
Control differential amplifier circuit carries out conducting disconnection to system switch respectively, the first turning circuit and the second turning circuit is formed, to reach
Preset gain value, wherein the grid width ratio of the first turning circuit and the second turning circuit is 1.122；
Fig. 2 and Fig. 3 is Fine gain step size controlling amplifier architecture schematic diagram of the embodiment of the present invention, using two groups of differential pairs
Shared current source and load control gain on the basis of keeping power supply I and load R is constant by adjusting the method for W grid width
Value.In order to realize accurate stepping, it is assumed that the grid width under two working conditions is respectively W1And W2, then obtainingThe gain formula andInclude only grid compared to greatly simplifying
Wide parameter can accomplish W in the case of technique manufacture and the rational design of domain1And W2Matching, so as to accurately control
W processed1/W2, and then realize that accurately gain controls.
The embodiment of the present invention uses two groups of differential pairs, and grid width is respectively W under the two states of switch control1And W2Finally
It obtainsIt can be seen that the absolute error of current source I and load R do not interfere with Δ Av, when actual fabrication,
W1And W2Two groups of amplifier tubes can have μnAnd CoxMismatch, give Δ AvError is introduced, therefore avoids or reduces as possible in the design
This error；
Further, as shown in Fig. 2, differential amplification module includes switching phase with the first control switch and the second control respectively
The first differential amplifier circuit and the second differential amplifier circuit of connection, wherein the on off state of the first control switch and the second control
The on off state for making switch is opposite；
When first control switch the first differential amplifier circuit of control is closed, second control switch the second differential amplification of control
Circuit disconnects, and the first turning circuit is the first differential amplifier circuit；When first control switch the first differential amplifier circuit of control is disconnected
When opening, second control switch the second differential amplifier circuit of control is closed, and the second turning circuit is the second differential amplifier circuit.
Specifically, including two groups of differential pair amplifiers, a current source I0, output loading R1 and two control switches！S and
S, wherein！S and S are opposite each other.Two groups of difference amplifiers share a current source and output loading, and the grid width of left side differential pair is used
W1It indicates, the grid width W of right side differential pair2It indicates.Every group of differential pair respectively by one switch control, circuit after the power is turned on, Ren Heshi
It is carved with and only one group of differential pair works.When the switch in left side is closed！The switch of S=1, right side disconnect S=0, then system is electric
Total grid width Wtotal on road is W1；When the switch in left side disconnects！The switch of S=0, right side are closed S=1, then circuit system
Total grid width Wtotal is W2, therefore,The variable gain amplifier for being 0.5dB for realization stepping, that
W1/W2=1.122, grid width size relatively, easily matches.
As shown in figure 3, differential amplification module includes switching the to be connected with the first control switch and the second control respectively
One differential amplifier circuit and the second differential amplifier circuit；
When first control switch the first differential amplifier circuit of control is closed, second controls switch control the second differential amplification electricity
When road is closed, the first turning circuit is that the first differential amplifier circuit and the second difference channel are in parallel；When the first control switch control
The first differential amplifier circuit closure is made, when second control switch the second differential amplifier circuit of control disconnects, the second turning circuit is
First differential amplifier circuit.
Shown in Fig. 3, including two groups of differential pair amplifiers, a current source I0, output loading R1With two control switch S0
And S, two groups of difference amplifiers share a current source and output loading.The grid width of left side differential pair indicates with W, right side differential pair
Grid width indicated with Δ W.Every group of differential pair respectively by one switch control, circuit after the power is turned on, when left side switch be closed S0=
1, the switch on right side is closed S=1, then total grid width Wtotal of circuit system is W+ Δs W；The switch in left side is closed S0=1, right
The switch of side disconnects S=0, then total grid width Wtotal of circuit system is W, therefore,For
Realize that stepping is the variable gain amplifier of 0.5dB, then (W+ Δ W)/W=1.122, the embodiment of the present invention and Fig. 2 embodiments
It compares, the program saves the area of domain.
It with reference to Fig. 4, switchs control differential amplifier circuit by controlling and carries out conducting disconnection, form the first turning circuit and the
Two turning circuits, to reach preset gain value, wherein the grid index ratio of the first turning circuit and the second turning circuit is
1.122。
Wherein, differential amplification module includes the first differential amplifier circuit and the second differential amplifier circuit, control switch and the
Two differential amplifier circuits are connected；
When control switch control the second differential amplifier circuit be closed when, the first turning circuit be the first differential amplifier circuit and
Second differential amplifier circuit is in parallel；When control, which switchs the second differential amplifier circuit of control, to be disconnected, the second turning circuit is the
One differential amplifier circuit, wherein the grid index ratio of grid index round numbers, the first turning circuit and the second turning circuit is 9: 8.
Fig. 4 is specifically using two groups of differential pair tubes, a current source, output loading R1With control switch GC, two groups of difference are put
Big device shares a current source and output loading.By above-mentioned, in the case where electric current is constant, grid width ratio is 1.122, if grid
Width is fixed, and if realizing gain control by changing grid index, grid index round numbers, then grid index ratio is 9：8, therefore,
The operating mode of the circuit is that left side differential pair works always, GC=1 is closed when GC is switched, then total grid of circuit system refer to
Number Finger is 9；GC=0 is disconnected when GC is switched, then total grid index Finger of circuit system is 8, the gain being achieved in
Step-length (Gstep)=0.51dB, than design object deviation 0.01dB, and preset gain value deviation is compared with above-described embodiment smaller,
Precision aspect is due to previous embodiment.
In addition, on the basis of Fig. 4 embodiments, the suitable electric current source size of selection, should ensure circuit in the electricity with caution
Flow down to work normally makes variable gain amplifier possess smaller power consumption as possible again；Suitable load value output is selected,
Should ensure that circuit can work normally under the load makes variable gain amplifier possess preferable area as possible again.
It is 20 μ A, grid width index when the embodiment of the present invention uses 0.18 μm of technique of SMIC, supply voltage 1.8V, current source
It is 9 that ratio, which is arranged, by Finger：When 8, its waveform is emulated, as shown in figure 5, gain frequency response when switch GC=0 is bent
Line, the gain frequency response curve M1 (240.6MHz, -6.023dB) when M0 (240.6MHz, -6.527dB), switch GC=1, M2 are vertical
The difference of both coordinate representations, which is 0.503dB, and design object 0.5dB error 0.003dB, in the base of Fig. 4 embodiments
It is preferred through current source and load value on plinth, realize more accurate yield value.It compares and realizes with amplifier closed loop amplifier
Automatic gain amplifier, the solution of the present invention structure is simpler, does not need additional adjunct circuit, and final circuit obtains relatively low
Power consumption, smaller area and higher bandwidth.
In above-mentioned Fig. 2, Fig. 3, Fig. 4, differential amplifier circuit includes the field-effect tube that two common sources are total to output loading, two fields
The grid input signal vip and vin of effect pipe, output loading R1It is defeated including the first output loading and the second output loading, first
Go out load with the first differential amplifier circuit to be connected, the second output loading is connected with the second differential amplifier circuit.
The embodiment of the present invention also provides a kind of navigation neceiver, including Fine gain step size controlling as described above amplification
Device.
The purpose of the scheme of above-mentioned Fine gain step size controlling amplifier is using new digital control gain (PGA)
Mode, amplifier ensure that size easily matches under open loop situations, ensure to realize under the premise of amplifier circuit superperformance
Small area, the Low-power-consumptiovariable variable gain amplifier of 0.5dB precision, are applied to navigation neceiver so that navigation neceiver
Working result is more accurate；
Navigation neceiver provided in an embodiment of the present invention, the Fine gain step size controlling amplifier provided with above-described embodiment
Technical characteristic having the same reaches identical technique effect so can also solve identical technical problem.
In the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " connects " connected "
Connect " it shall be understood in a broad sense, for example, it may be being fixedly connected, it may be a detachable connection, or be integrally connected；It can be machine
Tool connects, and can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary two members
Connection inside part.For the ordinary skill in the art, it can understand above-mentioned term in the present invention with concrete condition
Concrete meaning.
In the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for the description present invention and simplify description, do not indicate or imply the indicated device or element must have a particular orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for description purposes only, and is not understood to indicate or imply relative importance.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.The apparatus embodiments described above are merely exemplary, for example, the division of the unit,
Only a kind of division of logic function, formula that in actual implementation, there may be another division manner, in another example, multiple units or component can
To combine or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or beg for
The mutual coupling, direct-coupling or communication connection of opinion can be by some communication interfaces, device or unit it is indirect
Coupling or communication connection can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.
Finally it should be noted that：Embodiment described above, only specific implementation mode of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Any one skilled in the art
In the technical scope disclosed by the present invention, it can still modify to the technical solution recorded in previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover the protection in the present invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of Fine gain step size controlling amplifier, which is characterized in that including：Control switch, differential amplification module, current source
And output loading；
One end of the differential amplification module is connected with one end of the output loading, another termination electricity of the output loading
Source, the other end of the differential amplification module with it is described control switch one end be connected, it is described control switch the other end with
One end of the current source is connected, the other end ground connection of the current source, wherein the differential amplification module includes two differences
Divide amplifying circuit；
In the case where keeping the output loading current source constant, pass through the on off state of the control switch, control
The conducting state of differential amplifier circuit described in the differential amplification module, to reach preset gain value.
2. Fine gain step size controlling amplifier according to claim 1, which is characterized in that the preset gain value is
0.5dB。
3. Fine gain step size controlling amplifier according to claim 2, which is characterized in that control switch includes the
One control switch and the second control switch；
It controls to switch to control the differential amplifier circuit respectively with the second control switch and be connected by described first and break
It opens, the first turning circuit and the second turning circuit is formed, to reach the preset gain value, wherein first turning circuit
Grid width ratio with second turning circuit is 1.122.
4. Fine gain step size controlling amplifier according to claim 3, which is characterized in that the differential amplification module packet
Include the first differential amplifier circuit being connected respectively with the first control switch and the second control switch and the second difference
Amplifying circuit, wherein the on off state of the first control switch is opposite with the on off state of the second control switch；
When the first control switch first differential amplifier circuit of control is closed, the second control switch control described second
Differential amplifier circuit disconnects, and first turning circuit is first differential amplifier circuit；When the first control switch control
When making the first differential amplifier circuit and disconnecting, the second control switch controls second differential amplifier circuit and is closed, and described the
Two turning circuits are second differential amplifier circuit.
5. Fine gain step size controlling amplifier according to claim 3, which is characterized in that the differential amplification module packet
Include the first differential amplifier circuit being connected respectively with the first control switch and the second control switch and the second difference
Amplifying circuit；
When the first control switch first differential amplifier circuit of control is closed, the second control switch control described second is poor
When point amplifying circuit is closed, first turning circuit be first differential amplifier circuit and second difference channel mutually simultaneously
Connection；When the first control switch first differential amplifier circuit of control is closed, the second control switch control described second is poor
When amplifying circuit being divided to disconnect, second turning circuit is first differential amplifier circuit.
6. Fine gain step size controlling amplifier according to claim 2, which is characterized in that switched and controlled by the control
It makes the differential amplifier circuit and carries out conducting disconnection, form the first turning circuit and the second turning circuit, to reach described default
Yield value, wherein the grid index ratio of first turning circuit and second turning circuit is 1.122.
7. Fine gain step size controlling amplifier according to claim 6, which is characterized in that the differential amplification module packet
The first differential amplifier circuit and the second differential amplifier circuit are included, the control switch is connected with second differential amplifier circuit
It connects；
When the control, which switchs the second differential amplifier circuit of control, to be closed, first turning circuit is that first difference is put
Big circuit and second differential amplifier circuit are in parallel；When the control, which switchs the second differential amplifier circuit of control, to be disconnected,
Second turning circuit is first differential amplifier circuit, wherein the grid index round numbers, first turning circuit
Grid index ratio with second turning circuit is 9: 8.
8. Fine gain step size controlling amplifier according to claim 1, which is characterized in that the differential amplifier circuit packet
Include the field-effect tube that two common sources are total to output loading, the grid input signal of two field-effect tube.
9. Fine gain step size controlling amplifier according to claim 4, which is characterized in that the output loading includes the
One output loading and the second output loading, first output loading are connected with first differential amplifier circuit, and described
Two output loadings are connected with second differential amplifier circuit.
10. a kind of navigation neceiver, which is characterized in that including the Fine gain step-length control described in any one of claim 1-9
Amplifier processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811016384.0A CN108768326A (en) | 2018-08-31 | 2018-08-31 | Fine gain step size controlling amplifier and navigation neceiver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811016384.0A CN108768326A (en) | 2018-08-31 | 2018-08-31 | Fine gain step size controlling amplifier and navigation neceiver |
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| Publication Number | Publication Date |
|---|---|
| CN108768326A true CN108768326A (en) | 2018-11-06 |
Family
ID=63967920
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|---|---|---|---|
| CN201811016384.0A Pending CN108768326A (en) | 2018-08-31 | 2018-08-31 | Fine gain step size controlling amplifier and navigation neceiver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564639A (en) * | 2020-12-02 | 2021-03-26 | 广东美的白色家电技术创新中心有限公司 | Electrical equipment, electronic device and differential amplification circuit thereof |
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