CN103454654B - Configurable matching network used at satellite navigation radio frequency front end - Google Patents
Configurable matching network used at satellite navigation radio frequency front end Download PDFInfo
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Abstract
The invention discloses a configurable matching network used at a satellite navigation radio frequency front end. The configurable matching network comprises a set of parallel switch capacitor arrays, a set of parallel switch inductance arrays, a set of series switch inductance arrays and a set of series switch capacitor arrays. The configurable matching network can be used for matching impedance of various satellite navigation radio frequency receiver ports, changes equivalent capacitance or equivalent inductance value of a corresponding array through regulating and controlling the switch capacitor arrays and the switch inductance arrays, and is further matched with input impedance. The invention provides a matching tuning technology combining digit and analog and a digital signal control simulation circuit to realize matching of impedance. The configurable matching network is used inside an integrated circuit of a satellite navigation radio frequency receiver, realizes matching of networks through sending orders, is good in performance, convenient and quick to operate, saves time and cost for a developing process, and has a good application prospect.
Description
Technical field
The present invention relates to wireless communication electronics technical field, particularly relate to the impedance matching received for satellite navigation signals.
Background technology
The global navigation satellite system run in the world mainly contains: the gps system of the U.S., Muscovite GLONASS system, the Galileo in Europe and the big-dipper satellite positioning system of China.Other country is also at the satellite navigation and location system that positive formulation is autonomous.Thus, following Global Positioning System (GPS) will be multisystem and the general layout of depositing.Along with the fast development of infotech and the continuous growth of information requirement, user, in the urgent need to utilizing the resource of multiple satellite navigation system, adopts the mode of information fusion, effectively improves positioning precision.So can support that the receiver of two or more satellite system becomes a kind of trend future.
The reception process of radiofrequency signal is responsible for by receiver, whether loaded impedance is equal with the characteristic impedance of transmission line, and namely whether impedance matching is related to the quality of signal quality, when impedance matching is suitable, transmission can not produce reflection, and all transmitting energy of such guarantee is all absorbed by load.Therefore, suitable coupling effectively can avoid the power attenuation of radiofrequency signal in transmitting procedure.The input resistant matching of navigation radio-frequency front-end belongs to arrowband coupling, its centre frequency can be similar to and represent whole bandwidth of operation, so impedance matching only can consider a frequency, now building a narrow-band impedance coupling needs two-stage or three grades of elements just can complete usually.
Impedance matching network both also can be built by passive element by active component.Better than building with active component with passive element, because passive element is simpler than active component, more energy-conservation, and cost is lower.In passive element, understand deamplification due to resistance and introduce very important noise, being usually left out.Impedance matching network can build with one-level inductance and one-level electric capacity, therefore generally selects the topological structure of Γ shape, and namely two-stage element is made up of one-level series circuit unit and one-level parallel circuit unit respectively.
Traditional Γ shape matching network is divided into two schemes, and one as shown in Figure 3, namely select as inductance and parallel circuit unit is selected as electric capacity by series circuit unit.Now due to series circuit unit select for inductance element, so simultaneously in order to make the regulating action of inductance more continuous, also consider that the reception of navigation radiofrequency signal needs to carry out the reason every straight with process, in the series circuit unit of Γ shape structure matching network, inductance series capacitance is adopted to replace the inductance of connecting in original network.Series capacitance not only plays every straight effect, can also make up the uncontinuity of inductance, is equivalent to the fine setting to inductance.Another kind of traditional scheme as shown in Figure 4, namely select as electric capacity and parallel circuit unit is selected as inductance by series circuit unit.In this scheme, the inductance as parallel circuit unit generally can affect the continuity degree of regulating action because the value of inductance is discontinuous.But no matter be scheme one or scheme two, under different initial impedance, its applicability all defectiveness.The characteristic of initial impedance is depended in the selection of two schemes.
When frequency is higher, the effect of impedance matching is more obvious.The input end of radio-frequency transmitter needs the work that good coupling ability is stable.Because after process deviation during IC flow and encapsulation, the parasitic parameter of bonding line is inconsistent, cause the chip input impedance of final encapsulation inconsistent.If fixing calibrating element is integrated into chip internal when IC designs, the value of each device of the matching network that simple dependence draws according to theory calculate often reasonably can not match 50 ohm characteristic impedance of transmission line, is therefore do not realize desirable impedance matching when IC designs.So the input matching network of traditional radio-frequency transmitter can only realize coupling by the inductance of external circuit, electric capacity, comprise the parameter such as distributed capacitance, lead-in inductance.
Traditional matching network is the topological structure of a fixing combination, Γ shape as shown in Figure 3 or Figure 4.After outside circuit design completes, in network, the value of each several part device is fixing, although components and parts manually can be replaced when needing to adjust to revise the coupling combination of network, but element replaces inconvenience, and easily introduce the factors such as nonideal parasitism artificially, cause larger workload.Therefore traditional Method compare being undertaken mating by external circuit is mechanical, is tied very much, adds the inconvenience in research and development, increase the R&D cycle.
The fast development of wireless communication industry, has promoted the direction evolution of radio-frequency (RF) front-end circuit design towards high-performance, low cost, high integration.Thus, excellent as a kind of performance, integrated cost is low, accessible site, impedance matching mode convenient to operation, realize the tuning configurable matching network of coupling by configuration-direct and there is absolute advantage.
Summary of the invention
The present invention has done Optimal improvements to traditional matching network, merges the advantage of two kinds of traditional matching schemes, solves the shortcoming of two kinds of traditional matching schemes, provide a kind of configurable matching network.
A kind of configurable matching network for satellite navigation radio frequency front end, comprise parallel circuit unit and series circuit unit, it is characterized in that: described parallel circuit unit comprises the parallel switched capacitances array (11) and paralleling switch electric inductance array (12) that are connected in parallel; Described series circuit unit comprises the tandem tap electric inductance array (13) and tandem tap capacitor array (14) that are sequentially connected in series; First the radiofrequency signal that antenna is sent into enters parallel switched capacitances array (11) and paralleling switch electric inductance array (12), the tandem tap electric inductance array (13) be connected in series is sent into after parallel switched capacitances array (11) and paralleling switch electric inductance array (12) process, the output signal of tandem tap electric inductance array (13) directly sends into tandem tap capacitor array (14), exports late-class circuit to more afterwards;
Tandem tap electric inductance array (13) and tandem tap capacitor array (14), for carrying out first step conversion to the impedance connecting late-class circuit after series circuit unit;
Parallel switched capacitances array (11) and paralleling switch electric inductance array (12), for converting further the impedance of the late-class circuit after first step conversion, the initial impedance of late-class circuit is transformed to the center of Smith chart, complete impedance matching.
Wherein, described parallel switched capacitances array (11) is composed in parallel by N number of electronic circuit, and each electronic circuit is made up of metal-oxide-semiconductor and electric capacity; Wherein, N be greater than 1 natural number; One termination input signal connecting line of electric capacity, the drain electrode of another termination metal-oxide-semiconductor of electric capacity, the grid of metal-oxide-semiconductor connects control signal, the source ground of metal-oxide-semiconductor.
Wherein, described tandem tap capacitor array (14) is made up of M sub-circuit in parallel, and a front M-1 electronic circuit has identical structure, and each electronic circuit is made up of metal-oxide-semiconductor and capacitances in series, and M electronic circuit is only made up of a metal-oxide-semiconductor; Wherein, M be greater than 1 natural number; The source electrode of the metal-oxide-semiconductor wherein in M electronic circuit connects the output of tandem tap electric inductance array (13), and the grid of metal-oxide-semiconductor connects control signal, and the drain electrode of its metal-oxide-semiconductor connects late-class circuit; The source electrode of the metal-oxide-semiconductor in a front M-1 electronic circuit connects the output of tandem tap electric inductance array (13), and the grid of metal-oxide-semiconductor connects control signal, and the drain electrode of metal-oxide-semiconductor connects one end of electric capacity, another termination late-class circuit of electric capacity.
Wherein, described tandem tap electric inductance array (13) is composed in series by N number of electronic circuit, and each electronic circuit is made up of metal-oxide-semiconductor and inductance; Wherein, N be greater than 1 natural number; The output of one termination front stage circuits of inductance and the source electrode of metal-oxide-semiconductor, the drain electrode of another termination metal-oxide-semiconductor of inductance, the grid of metal-oxide-semiconductor connects control signal.
Wherein, described paralleling switch electric inductance array (12) is composed in series by N number of electronic circuit, and a front N-1 electronic circuit has identical structure, and each electronic circuit is made up of metal-oxide-semiconductor and inductance in parallel, and N number of electronic circuit is only made up of a metal-oxide-semiconductor; Wherein, N be greater than 1 natural number; The drain electrode of the metal-oxide-semiconductor wherein in N number of electronic circuit connects the input signal cable of antenna, and the grid of metal-oxide-semiconductor connects control signal, and the source electrode of its metal-oxide-semiconductor connects the drain electrode of subordinate's metal-oxide-semiconductor in paralleling switch electric inductance array (12); The drain electrode of the metal-oxide-semiconductor in a front N-1 electronic circuit connects the source electrode of higher level's metal-oxide-semiconductor in paralleling switch electric inductance array (12), and the grid of metal-oxide-semiconductor connects control signal, and the drain electrode of metal-oxide-semiconductor connects one end of inductance, and the source electrode of metal-oxide-semiconductor connects the other end of inductance; In paralleling switch electric inductance array (12), the source ground of afterbody metal-oxide-semiconductor.
Parallel switched capacitances array 11 is composed in parallel by N number of electronic circuit, and each electronic circuit is made up of metal-oxide-semiconductor and electric capacity; Wherein, N be greater than 1 natural number; One termination input signal connecting line of electric capacity, the drain electrode of another termination metal-oxide-semiconductor of electric capacity, the grid of metal-oxide-semiconductor connects control signal, the source ground of metal-oxide-semiconductor.
Control signal S
icontrol turning on and off of metal-oxide-semiconductor, realize corresponding capacitance access array circuit.The control signal S of parallel switched capacitances array 11 is the binary digital signal of a N position, each S of binary signal
icontrol an electronic circuit.When the capacitive reactance of the specific capacitor in lowest order electronic circuit is chosen to be C, the capacitive reactance of the specific capacitor in each electronic circuit is just determined, is 2
i* C.The parallel connection of N number of electronic circuit forms whole parallel switched capacitances array 11, and making this parallel switched capacitances array 11 access the capacitive reactance of the equivalent capacity at whole networking can 0 ~ (2
n-1) the interior change of the scope of * C, resolution accuracy is C.
In tandem tap capacitor array 14, a front N-1 electronic circuit has identical structure with the electronic circuit of described one group of parallel switched capacitances array 11, but the source electrode of metal-oxide-semiconductor connects the output of front stage circuits.Digital signal most significant digit S "
n-1the electronic circuit controlled is only by a metal-oxide-semiconductor M "
n-1form.Metal-oxide-semiconductor M when electronic circuit "
n-1during shutoff, the control mode of low N-1 position is identical with the low N-1 position of described parallel switched capacitances array 11 with practical function.As metal-oxide-semiconductor M "
n-1during conducting, the metal-oxide-semiconductor short circuit that whole tandem tap capacitor array 14 is switched on, now regardless of low N-1 position state in array, it is tuning that this array does not participate in coupling.N number of electronic circuit composes in parallel array, series connection access matching network circuit.
Tandem tap electric inductance array 13 is composed in series by N number of electronic circuit, and each electronic circuit is made up of metal-oxide-semiconductor and inductance; Wherein, N be greater than 1 natural number; One termination input signal connecting line of inductance and the source electrode of metal-oxide-semiconductor, the drain electrode of another termination metal-oxide-semiconductor of inductance, the grid of metal-oxide-semiconductor connects control signal.
Control signal S ＇
icontrol turning on and off of metal-oxide-semiconductor, realize corresponding inductance access array circuit.The control signal S ＇ of tandem tap electric inductance array 13 is the binary digital signal of a N position, each S ＇ of binary signal
icontrol an electronic circuit.When the induction reactance of the specific inductance in lowest order electronic circuit is chosen to be L, the induction reactance of the specific inductance in each electronic circuit is just determined, is 2
i* L.N number of electronic circuit whole tandem tap electric inductance array 13 in series, making this electric inductance array access the size of the equivalent inductance at whole networking can 0 ~ (2
n-1) the interior change of the scope of * L, resolution accuracy is L.
In paralleling switch electric inductance array 12, a front N-1 electronic circuit has identical structure with the electronic circuit of described one group of tandem tap electric inductance array 13; Digital signal most significant digit S " ＇
n-1the electronic circuit controlled is only by a metal-oxide-semiconductor M " ＇
n-1form.As the metal-oxide-semiconductor M " ＇ of electronic circuit
n-1during conducting, the control mode of low N-1 position is identical with the low N-1 position of described tandem tap electric inductance array 13 with practical function.As metal-oxide-semiconductor M " ＇
n-1during shutoff, whole paralleling switch electric inductance array 12 disconnects with matching network, and now regardless of low N-1 position state in array, it is tuning that this array does not participate in coupling.N number of electronic circuit is composed in series array, access matching network circuit in parallel.
The present invention's beneficial effect is compared with prior art:
The present invention is used for being integrated in IC inside, can realize input feature vector impedance matching conveniently by steering order radio frequency front end system, simple and quick.Simplify the external circuit of radio frequency front end chip simultaneously, decrease the number of devices of external circuit, for R&D process saves time and cost, be applicable to be integrated in various radio frequency front end chip inner, be widely used.
Accompanying drawing explanation
Fig. 1 is used for the configurable matching network schematic diagram of satellite navigation radio frequency front end
Fig. 2 is used for the configurable matching network embodiment schematic diagram of satellite navigation radio frequency front end
Matching network circuit scheme one schematic diagram applied in Fig. 3 traditional circuit;
Matching network circuit scheme two schematic diagram applied in Fig. 4 traditional circuit;
The electronic circuit schematic diagram of Fig. 5 binary weighting switched capacitor array;
The electronic circuit schematic diagram of Fig. 6 binary weighting switched inductors array;
Fig. 7 matching network realizes the traction path schematic diagram of impedance matching.
Embodiment
In order to make object of the present invention, technical scheme and applicating superiority clearly understand, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Shown in Fig. 2 basic composition theory diagram is adopt configurable matching network of the present invention.After being connected to rf signal reception end, before the radio-frequency front-end processing units such as LNA.The parallel circuit comprising one group of parallel switched capacitances array 11 and one group of paralleling switch electric inductance array 12 is connected between rf signal reception end and ground as parallel circuit unit; The series circuit of one group of tandem tap electric inductance array 13 and tandem tap capacitor array 14, as series circuit unit, is connected between the radio-frequency front-end processing modules such as rf signal reception end and LNA.
Parallel switched capacitances array 11 by N (N be greater than 1 natural number) organize same subunit and compose in parallel, as shown in Figure 5, each subelement is made up of metal-oxide-semiconductor and capacitances in series, N (N be greater than 1 natural number) organize choosing of electric capacity capacitor value in electronic circuit and meet binary weighting relation, precision choose the parameter depending on other unit of radio frequency front end chip.
Paralleling switch electric inductance array 12 by N (N be greater than 1 natural number) organize subelement and be composed in series, a front N-1 subelement has identical structure, as shown in Figure 6, each subelement is made up of metal-oxide-semiconductor and inductance in parallel, and N group subelement is only made up of a metal-oxide-semiconductor.In N group electronic circuit, choosing of inductance induction reactance value meets binary weighting relation, precision choose the parameter depending on other unit of radio frequency front end chip.
Tandem tap electric inductance array 13 by N (N be greater than 1 natural number) organize same subunit and be composed in series, as shown in Figure 6, each subelement is made up of metal-oxide-semiconductor and inductance in parallel, in N group electronic circuit, choosing of inductance induction reactance value meets binary weighting relation, precision choose the parameter depending on other unit of radio frequency front end chip.
Tandem tap capacitor array 14 by N (N be greater than 1 natural number) organize subelement and compose in parallel, a front N-1 subelement has identical structure, as shown in Figure 5, each subelement is made up of metal-oxide-semiconductor and capacitances in series, and N group subelement is only made up of a metal-oxide-semiconductor.In N group electronic circuit, choosing of electric capacity capacitor value meets binary weighting relation, precision choose the parameter depending on other unit of radio frequency front end chip.
In narrow-band impedance coupling, when an electric capacity is inserted in parallel connection in impedance matching network, insert the susceptance Δ B=Δ B of electric capacity
cfor just, its amplitude is increasing along with the increase of frequency of operation; Insert a shunt capacitance C
p, make impedance P along in Smith chart etc. the smoother hour hands of conductance move, mobile arc length is determined by capacitance.When an inductance is inserted in parallel connection in impedance matching network, insert the susceptance Δ B=Δ B of inductance
lbe negative, its amplitude reduces along with the increase of frequency of operation; Insert a shunt inductance L
p, make impedance P mobile counterclockwise along Smith chart medium conductance circle, mobile arc length is determined by inductance value.
When connect in impedance matching network an insertion inductance time, the induction reactance Δ X=Δ X of insertion
lfor just, and its amplitude increases along with the increase of frequency of operation; Insert series inductance L
simpedance P is moved along the smoother hour hands of resistance that wait of Smith chart, and the arc length of movement is determined by inductance value.When an impedance matching network series connection insertion electric capacity, insert capacitive reactance Δ X=Δ X
cbe negative, its amplitude reduces with the increase of frequency of operation; Insert a series capacitance C
simpedance P is moved counterclockwise along the resistance circle that waits of Smith chart, and mobile arc length is determined by capacitance.
In impedance matching network as shown in Figure 3, series inductance L
sduring increase, initial impedance P is moved, how many decisions that mobile arc length is increased by inductance value along the smoother hour hands of resistance that wait in Smith chart.As series inductance L
sduring reduction, initial impedance P is moved counterclockwise, how many decisions that mobile arc length is reduced by inductance value along the resistance circle that waits in Smith chart.In traditional matching network, can only by changing the operation that inductance element carries out increasing or reducing, in constantly debugging coupling, not only workload is large, loaded down with trivial details but also the imponderable parasitic parameter of easy introducing.And in described configurable matching network, only with simply by Digital Signals tandem tap electric inductance array 13, change conducting or the off state of certain one or more metal-oxide-semiconductor, just can realize the change of the equivalent inductive reactance of whole array, equivalently can regard series inductance L as
sincrease or reduction, complete initial impedance P in Smith chart edge wait resistance circle clockwise or counterclockwise movement.Tentatively complete the traction of initial impedance P to realize impedance matching.
In impedance matching network as shown in Figure 3, shunt capacitance C
pduring increase, make initial impedance P along in Smith chart etc. the smoother hour hands of conductance move, mobile arc length is by how many decisions of the increase of capacitance.As shunt capacitance C
pduring reduction, make initial impedance P along in Smith chart etc. conductance circle counterclockwise mobile, how many decisions that mobile arc length is reduced by capacitance.Compared with traditional matching network, in described configurable matching network, same only with simply by Digital Signals parallel switched capacitances array 11, carry out initial impedance the P clockwise or counterclockwise movement that the conductance such as edge is justified in Smith chart.Thus further initial impedance P is drawn to the center of Smith chart.
Described in the configurable matching network of satellite navigation radio frequency front end, in order to make up traditional scheme one very flexible, debugging on Circuit Matching complicated etc. in defect, one group of paralleling switch electric inductance array 12 is linked to parallel circuit cell level.As shunt inductance L in impedance matching network
pduring increase, make initial impedance P along in Smith chart etc. conductance circle counterclockwise mobile; Shunt inductance L
pduring reduction, make initial impedance P along in Smith chart etc. the smoother hour hands of conductance move, how many decisions that mobile arc length is increased by inductance value or reduces.Described in the configurable matching network of satellite navigation radio frequency front end, identical with to the control mode of tandem tap electric inductance array 13 to the control mode of paralleling switch electric inductance array 12.
Described in the configurable matching network of satellite navigation radio frequency front end; in order to make the regulating action of tandem tap electric inductance array 13 more continuous; after Γ l network, connect tandem tap capacitor array 14 to make up uncontinuity when tandem tap electric inductance array 13 changes equally, can do every straight protection processing units such as the amplifications of rear class simultaneously.Series capacitance C
sduring increase, initial impedance P is moved counterclockwise along the resistance circle that waits in Smith chart; As series capacitance C
sduring reduction, initial impedance P is moved, how many decisions that mobile arc length is increased by capacitance or reduces along the smoother hour hands of resistance that wait in Smith chart.The effect that the draw of series capacitance to initial impedance P compares series inductance is more weak, therefore finely tunes by the draw of electric capacity to inductance.Described in the configurable matching network of satellite navigation radio frequency front end, identical with to the control mode of parallel switched capacitances array 11 to the control mode of tandem tap capacitor array 14.
Structure shown in Fig. 2 is that when adopting this kind to transmit for the configurable matching network radio frequency Received signal strength of satellite navigation radio frequency front end, radio frequency front-end chip carries out the application structure schematic diagram of impedance matching.After antenna receives radiofrequency signal, transfer to radio frequency front end chip input port.In order to ensure that radio-frequency module completes without the maximum power transfer under phase shifting scenarios, be integrated with the configurable matching network of this kind for satellite navigation radio frequency front end at the input port of radio frequency front end chip, radio signal transmission enters the processing unit such as LNA and the amplification of other radiofrequency signal, down coversion, filtering after this matching network.As previously described, when input port impedance matching is unreasonable, reflection can be produced, therefore need to send digital controlled signal by host computer, by the corresponding register of SPI mouth configure radio-frequency front-end chip internal, the equivalent capacitive reactance of capacitor array and the equivalent inductive reactance of electric inductance array are regulated and controled, first carry out first step traction by the tandem tap electric inductance array 13 in regulation and control series circuit unit with the initial impedance of tandem tap capacitor array 14 pairs of late-class circuits, then the parallel switched capacitances array 11 in parallel circuit unit and paralleling switch electric inductance array 12 are configured, impedance in the first step is further drawn, and initial impedance is drawn to the center of Smith chart the most at last, thus the input feature vector impedance of whole radio-frequency front-end adjustment is matched 50 ohm, realize the regulation and control of coupling.Such as, when the normalized impedance of initial impedance P is positioned at a certain region of Smith chart, as shown in Figure 7 during position, initial impedance P can be drawn to the center O of Smith chart by this scheme.Along the traction in P-A-O path, the first first step, first by turning the equivalent inductance of tandem tap electric inductance array 13 down suitable value, or the equivalent capacity of tandem tap capacitor array 13 being tuned up suitable value, being waited on initial impedance P edge the traction of resistance circle to A point; Second step, then by the equivalent capacitance value of tandem tap capacitor array 14 is tuned up appropriate value, or turn the equivalent inductance value of paralleling switch electric inductance array 12 down appropriate value, can draw center O to Smith chart by conductance circles such as initial impedance edges by A point.
The above, be only a kind of concrete embodiment of the present invention.This implementation is the one of Γ type network, in addition T-shaped, Π type etc. in addition.Protection scope of the present invention is not limited thereto, and is anyly familiar with those skilled in the art in the technical scope that the present invention discloses, the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (5)
1. the configurable matching network for satellite navigation radio frequency front end, comprise parallel circuit unit and series circuit unit, it is characterized in that: described parallel circuit unit comprises the parallel switched capacitances array (11) and paralleling switch electric inductance array (12) that are connected in parallel; Described series circuit unit comprises the tandem tap electric inductance array (13) and tandem tap capacitor array (14) that are sequentially connected in series; First the radiofrequency signal that antenna is sent into enters parallel switched capacitances array (11) and paralleling switch electric inductance array (12), the tandem tap electric inductance array (13) be connected in series is sent into after parallel switched capacitances array (11) and paralleling switch electric inductance array (12) process, the output signal of tandem tap electric inductance array (13) directly sends into tandem tap capacitor array (14), exports late-class circuit to more afterwards;
Tandem tap electric inductance array (13) and tandem tap capacitor array (14), for carrying out first step conversion to the impedance connecting late-class circuit after series circuit unit;
Parallel switched capacitances array (11) and paralleling switch electric inductance array (12), for converting further the impedance of the late-class circuit after first step conversion, the initial impedance of late-class circuit is transformed to the center of Smith chart, complete impedance matching.
2. a kind of configurable matching network for satellite navigation radio frequency front end according to claim 1, it is characterized in that: described parallel switched capacitances array (11) is composed in parallel by N number of electronic circuit, and each electronic circuit is made up of metal-oxide-semiconductor and electric capacity; Wherein, N be greater than 1 natural number; One termination input signal connecting line of electric capacity, the drain electrode of another termination metal-oxide-semiconductor of electric capacity, the grid of metal-oxide-semiconductor connects control signal, the source ground of metal-oxide-semiconductor.
3. a kind of configurable matching network for satellite navigation radio frequency front end according to claim 1, it is characterized in that: described tandem tap capacitor array (14) is made up of M sub-circuit in parallel, a front M-1 electronic circuit has identical structure, each electronic circuit is made up of metal-oxide-semiconductor and capacitances in series, and M electronic circuit is only made up of a metal-oxide-semiconductor; Wherein, M be greater than 1 natural number; The source electrode of the metal-oxide-semiconductor wherein in M electronic circuit connects the output of tandem tap electric inductance array (13), and the grid of metal-oxide-semiconductor connects control signal, and the drain electrode of its metal-oxide-semiconductor connects late-class circuit; The source electrode of the metal-oxide-semiconductor in a front M-1 electronic circuit connects the output of tandem tap electric inductance array (13), and the grid of metal-oxide-semiconductor connects control signal, and the drain electrode of metal-oxide-semiconductor connects one end of electric capacity, another termination late-class circuit of electric capacity.
4. a kind of configurable matching network for satellite navigation radio frequency front end according to claim 1, it is characterized in that: described tandem tap electric inductance array (13) is composed in series by N number of electronic circuit, and each electronic circuit is made up of metal-oxide-semiconductor and inductance; Wherein, N be greater than 1 natural number; The output of one termination front stage circuits of inductance and the source electrode of metal-oxide-semiconductor, the drain electrode of another termination metal-oxide-semiconductor of inductance, the grid of metal-oxide-semiconductor connects control signal.
5. a kind of configurable matching network for satellite navigation radio frequency front end according to claim 1, it is characterized in that: described paralleling switch electric inductance array (12) is composed in series by N number of electronic circuit, a front N-1 electronic circuit has identical structure, each electronic circuit is made up of metal-oxide-semiconductor and inductance in parallel, and N number of electronic circuit is only made up of a metal-oxide-semiconductor; Wherein, N be greater than 1 natural number; The drain electrode of the metal-oxide-semiconductor wherein in N number of electronic circuit connects the input signal cable of antenna, and the grid of metal-oxide-semiconductor connects control signal, and the source electrode of its metal-oxide-semiconductor connects the drain electrode of subordinate's metal-oxide-semiconductor in paralleling switch electric inductance array (12); The drain electrode of the metal-oxide-semiconductor in a front N-1 electronic circuit connects the source electrode of higher level's metal-oxide-semiconductor in paralleling switch electric inductance array (12), and the grid of metal-oxide-semiconductor connects control signal, and the drain electrode of metal-oxide-semiconductor connects one end of inductance, and the source electrode of metal-oxide-semiconductor connects the other end of inductance; In paralleling switch electric inductance array (12), the source ground of afterbody metal-oxide-semiconductor.
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| CN104582146A (en) * | 2014-12-17 | 2015-04-29 | 深圳市众明半导体照明有限公司 | Led drive circuit |
| KR101695457B1 (en) * | 2015-03-20 | 2017-01-12 | 주식회사 맵스 | Wireless Power receiving unit |
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