CN103346789A - Frequency divider based on micromachine indirect thermoelectric type power sensor and manufacturing method - Google Patents
Frequency divider based on micromachine indirect thermoelectric type power sensor and manufacturing method Download PDFInfo
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- CN103346789A CN103346789A CN2013102456442A CN201310245644A CN103346789A CN 103346789 A CN103346789 A CN 103346789A CN 2013102456442 A CN2013102456442 A CN 2013102456442A CN 201310245644 A CN201310245644 A CN 201310245644A CN 103346789 A CN103346789 A CN 103346789A
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Abstract
The invention discloses a frequency divider based on a micromachine indirect thermoelectric type power sensor and a manufacturing method. The frequency divider comprises a substrate, a power combiner, an MEMS indirect type microwave power sensor, an external voltage-controlled oscillator and an external divider, wherein the substrate is made of gallium arsenide, and the power combiner and the MEMS indirect type microwave power sensor are installed on the substrate. An output signal of the voltage-controlled oscillator passes through the divider and then is fed back to an input end of the power combiner, a reference signal is applied to another input end of the voltage-controlled oscillator and is detected by the indirect thermoelectric type power sensor, and a voltage is obtained, wherein a ratio is formed between the voltage and a phase difference of the reference signal and the output signal of the voltage-controlled oscillator. The voltage is applied to the input end of the voltage-controlled oscillator, and the local oscillator signal frequency of the voltage-controlled oscillator changes along with changes of the voltage. On the basis, the invention further discloses a manufacturing method of the frequency divider based on the micromachine indirect thermoelectric type power sensor. The frequency divider is simple in structure, smaller in size, higher in precision, and good in practicability.
Description
Technical field
The present invention relates to the technical field of microelectromechanical systems (MEMS), especially relate to a kind of frequency divider based on the indirect thermoelectric (al) type power sensor of micromechanics.
Background technology
Frequency divider (frequency divider) is to make output signal frequency be the circuit of the whole approximate number of its incoming frequency.Frequency divider has application in various fields, as radio communication, radar, Digital Television, broadcasting etc.The phase-locked loop frequency divider of current extensive employing has the very high advantage of precision, but circuit structure complexity, larger-size shortcoming are also arranged.Along with advancing by leaps and bounds of microelectric technique, new material, new technology, new technology continue to bring out, impel the requirement to electronic equipments such as wireless communication system and radar systems to improve constantly: simple structure, the higher divider circuit of smaller volume and precision becomes a kind of trend.Current, the MEMS technology has obtained fast development, the research of thermoelectric (al) type power sensor reaches its maturity indirectly, makes the frequency divider based on the indirect thermoelectric (al) type power sensor of micromechanics become possibility, therefore is necessary to design a kind of frequency divider based on the indirect thermoelectric (al) type power sensor of micromechanics.
Summary of the invention
For solving the deficiency that present frequency divider exists, the present invention proposes a kind of frequency divider based on the indirect thermoelectric (al) type power sensor of micromechanics, and this fraction frequency device is simple, volume is littler, precision is higher.
For achieving the above object, the present invention adopts following technical scheme:
A kind of frequency divider based on the indirect thermoelectric (al) type power sensor of micromechanics, the merit that comprise substrate, is arranged on the substrate is closed device and MEMS indirect type microwave power detector and external voltage controlled oscillator and multiplier, at axis of symmetry of substrate definition; Merit is closed device and is formed along axis of symmetry symmetrical structure, comprises ground wire, coplanar waveguide transmission line, two sections asymmetric coplanar striplines, isolation resistance, two groups of clamped beams and anchor district; MEMS indirect type microwave power detector comprises two groups of terminal resistances, metal thermocouple arm, semiconductor thermocouple arm, metal connecting line and two direct current IOB.
Described ground wire forms along axis of symmetry symmetrical structure, comprises that symmetry is positioned at axis of symmetry both sides and not contacted two sections side ground wires, symmetries and is positioned at one section common ground on the axis of symmetry.
Described coplanar waveguide transmission line forms along axis of symmetry symmetrical structure, comprises that two sections input coplanar waveguide transmission lines, symmetries being positioned at axis of symmetry both sides and not being connected are positioned at one section output coplanar waveguide transmission line on the axis of symmetry; Described two sections input coplanar waveguide transmission lines are connected with two sections asymmetric coplanar striplines inputs respectively; Described two sections asymmetric coplanar striplines inputs are isolated by isolation resistance, insert the output coplanar waveguide transmission line after described two sections asymmetric coplanar striplines outputs are connected; Described two sections asymmetric coplanar striplines and isolation resistance form along axis of symmetry symmetrical structure; Conduct is with reference to signal input port and feedback signal input port respectively for described two sections input coplanar waveguide transmission lines, and described output coplanar waveguide transmission line is as signal output port.
Described two groups of clamped beams are separately positioned on both sides and the relative axis of symmetry symmetry of the axis of symmetry, described clamped beam is connected across the top of the input co-planar waveguide hop that is positioned at the same side, and two ends are fixed on the ground wire side ground wire and common ground that is positioned at the same side by the anchor district respectively.
Described output coplanar waveguide transmission line is connected by one group of terminal resistance with two sections side ground wires respectively, and described two groups of terminal resistances correspondence respectively are provided with one group of thermocouple; One end of described two groups of thermocouples is connected in series by the metal connecting line, and the other end is connected with the direct current IOB by the metal connecting line respectively; One of them direct current IOB is connected with the voltage controlled oscillator input, another direct current IOB ground connection; Described thermocouple is made up of metal thermocouple arm and semiconductor thermocouple arm.
The output of described voltage controlled oscillator links to each other with multiplier input, and the output of described multiplier links to each other with the feedback signal input port.
The coplanar waveguide transmission line that merit is closed device clamped beam and below constitutes building-out capacitor, and the size of dwindling power splitter when the design of this building-out capacitor can realize the circuit impedance coupling makes the integrated level of whole frequency divider higher.The output signal of voltage controlled oscillator by a multiplier (* N) feed back to the input that merit is closed device again, reference signal is added in another input that merit is closed device, through thermoelectric (al) type power sensor detection indirectly, obtain and the proportional voltage of the phase difference of reference signal and voltage controlled oscillator output signal, this voltage is added to the input of voltage controlled oscillator, and the local oscillation signal frequency of voltage controlled oscillator is changed along with the variation of the voltage of importing.It is N/one of reference signal that appropriate loop design, this variation can make the frequency of voltage controlled oscillator output signal.
Further, be provided with silicon nitride medium layer (11) between described coplanar waveguide transmission line (3) and the clamped beam (12), described silicon nitride medium layer (11) covers on the coplanar waveguide transmission line (3), and the coplanar waveguide transmission line that makes merit close device clamped beam and below constitutes building-out capacitor.
The present invention also proposes a kind of preparation method of the frequency divider based on the indirect thermoelectric (al) type power sensor of micromechanics, comprises following steps:
(1) makes gallium arsenide substrate: select the semi-insulating GaAs substrate of extension for use, wherein extension N
+The doping content of GaAs is 10
18Cm
-3, its square resistance is 100～130 Ω/;
(2) photoetching and isolate the N of extension
+GaAs, figure and the ohmic contact regions of the semiconductor thermocouple arm of formation thermoelectric pile;
(3) anti-carve N
+GaAs, forming its doping content is 10
17Cm
-3The semiconductor thermocouple arm of thermoelectric pile;
(4) photoetching: removal will keep the local photoresist of gold germanium nickel/gold;
(5) sputter gold germanium nickel/gold, its thickness is altogether
(6) peel off, form the metal thermocouple arm of thermoelectric pile;
(7) photoetching: removal will keep the photoresist in tantalum nitride place;
(8) sputter tantalum nitride, its thickness are 1 μ m;
(9) peel off;
(10) photoetching: removal will keep the photoresist in the place of ground floor gold;
(11) evaporation ground floor gold, its thickness is 0.3 μ m;
(12) peel off, form anchor district, direct current IOB and the metal connecting line of coplanar waveguide transmission line (CPW), asymmetric coplanar striplines (ACPS), ground wire, MEMS clamped beam;
(13) anti-carve tantalum nitride, form terminal resistance, its square resistance is 25 Ω/;
(14) deposit silicon nitride: with the growth of plasma-enhanced chemical vapour deposition technology
Thick silicon nitride medium layer;
(15) photoetching and etch silicon nitride dielectric layer: be retained in the silicon nitride on the MEMS clamped beam below coplanar waveguide transmission line (CPW);
(16) deposit and photoetching polyimide sacrificial layer: apply the thick polyimide sacrificial layer of 1.6 μ m in gallium arsenide substrate, pit is filled up in requirement, and the thickness of polyimide sacrificial layer has determined MEMS clamped beam and its below distance between the last silicon nitride medium layer of main line coplanar waveguide transmission line (CPW); The photoetching polyimide sacrificial layer only keeps the sacrifice layer of clamped beam below;
(17) evaporation titanium/gold/titanium, its thickness is
: evaporation is used for the down payment of plating;
(18) photoetching: removal will be electroplated local photoresist;
(19) electrogilding, its thickness are 2 μ m;
(20) remove photoresist: removing does not need to electroplate local photoresist;
(21) anti-carve titanium/gold/titanium, the corrosion down payment forms coplanar waveguide transmission line (CPW), asymmetric coplanar striplines (ACPS), ground wire, MEMS clamped beam, direct current IOB and metal connecting line;
(22) with this gallium arsenide substrate thinning back side to 100 μ m;
(23) discharge polyimide sacrificial layer: developer solution soaks, and removes the polyimide sacrificial layer under the MEMS clamped beam, and deionized water soaks slightly, and the absolute ethyl alcohol dehydration is volatilized under the normal temperature, dries;
(24) external voltage controlled oscillator and multiplier.
Beneficial effect: (1) frequency divider of the present invention has novel structure based on the indirect thermoelectric (al) type power sensor of micromechanics, the advantage that circuit size is little, and have higher precision; (2) frequency divider of the present invention be easy to integrated, and with GaAs monolithic integrated microwave circuit compatibility; (3) merit in the frequency divider of the present invention is closed the coplanar waveguide transmission line formation building-out capacitor of device clamped beam and its below, and the size of dwindling power splitter when the design of this building-out capacitor can realize the circuit impedance coupling makes the integrated level of whole frequency divider higher.
Description of drawings
Fig. 1 is fraction frequency device vertical view of the present invention;
Fig. 2 is the A-A' profile of Fig. 1;
Fig. 3 is the B-B' profile of Fig. 1;
Embodiment:
Below in conjunction with accompanying drawing the present invention is done further explanation.
As shown in Figure 1, a kind of frequency divider based on the indirect thermoelectric (al) type power sensor of micromechanics that the present invention proposes, comprise with GaAs (GaAs) being that the substrate 1 of material, the merit that is arranged on the substrate 1 are closed device and MEMS indirect type microwave power detector and external voltage controlled oscillator and multiplier, at axis of symmetry of substrate 1 definition, as shown in Figure 2.
Merit is closed device and is formed along axis of symmetry symmetrical structure, comprises ground wire 2, coplanar waveguide transmission line 3, two sections asymmetric coplanar striplines 4, isolation resistance 5, two groups of clamped beams 12 and anchor district 13; The effect that merit is closed device be with reference signal and through multiplier (* that N) signal of feedback control loop output carries out vector is synthetic.Carry out having a phase difference between two synthetic microwave signals of vector, there are the relation of a cosine function in the power of composite signal and this phase difference.
MEMS indirect type microwave power detector comprises two groups of terminal resistances 6, metal thermocouple arm 7, semiconductor thermocouple arm 8, metal connecting line 9 and two direct current IOB 10; MEMS indirect type microwave power detector detects the size of composite signal power based on the Seebeck principle, and exports with voltage form.
Coplanar waveguide transmission line 3 forms along axis of symmetry symmetrical structure, comprises that two sections input coplanar waveguide transmission lines, symmetries being positioned at axis of symmetry both sides and not being connected are positioned at one section output coplanar waveguide transmission line on the axis of symmetry; Described two sections input coplanar waveguide transmission lines are connected with two sections asymmetric coplanar striplines 4 inputs respectively; Described two sections asymmetric coplanar striplines 4 inputs are isolated by isolation resistance 5, insert the output coplanar waveguide transmission line after described two sections asymmetric coplanar striplines 4 outputs are connected; Described two sections asymmetric coplanar striplines 4 and isolation resistance 5 form along axis of symmetry symmetrical structure; Conduct is with reference to signal input port and feedback signal input port respectively for described two sections input coplanar waveguide transmission lines, and described output coplanar waveguide transmission line is as signal output port; As shown in Figure 3, be provided with silicon nitride medium layer 11 between described coplanar waveguide transmission line 3 and the clamped beam 12, described silicon nitride medium layer 11 covers on the coplanar waveguide transmission line 3, and the coplanar waveguide transmission line that makes merit close device clamped beam and below constitutes building-out capacitor.
Two groups of clamped beams 12 are separately positioned on both sides and the relative axis of symmetry symmetry of the axis of symmetry, described clamped beam 12 is connected across the top of the input co-planar waveguide hop that is positioned at the same side, and two ends are fixed on the ground wire 2 side ground wires and common ground that are positioned at the same side by anchor district 13 respectively;
The output coplanar waveguide transmission line is connected by one group of terminal resistance 6 with two sections side ground wires respectively, and described two groups of terminal resistances 6 correspondence respectively are provided with one group of thermocouple; One end of described two groups of thermocouples is connected in series by metal connecting line 9, and the other end is connected with direct current IOB 10 by metal connecting line 9 respectively; One of them direct current IOB 10 is connected with the voltage controlled oscillator input, another direct current IOB 10 ground connection; Described thermocouple is made up of metal thermocouple arm 7 and semiconductor thermocouple arm 8;
The output of voltage controlled oscillator links to each other with multiplier input, and the output of described multiplier links to each other with the feedback signal input port.Voltage controlled oscillator and multiplier can be made of the sheet external circuit.The output signal of voltage controlled oscillator by a multiplier (* N) feed back to merit again to close one of them input of device, reference signal is added in another input that merit is closed device, merit is closed device, and to carry out vector synthetic, the microwave signal power delivery that obtains is to indirect thermoelectric (al) type power sensor, export the voltage that a phase difference with reference signal and voltage controlled oscillator output signal is ratio, this voltage is added to the input of voltage controlled oscillator, then the local frequency of voltage controlled oscillator changes along with the variation of this input voltage, if loop design is proper, when loop-locking, the frequency of voltage controlled oscillator output signal is the N of reference signal/one.
The present invention also provides a kind of preparation method of the frequency divider based on the indirect thermoelectric (al) type power sensor of micromechanics to be:
(1) prepares gallium arsenide substrate: select the semi-insulating GaAs substrate of extension for use, wherein extension N
+The doping content of GaAs is 10
18Cm
-3, its square resistance is 100～130 Ω/;
(2) photoetching and isolate the N of extension
+GaAs, figure and the ohmic contact regions of the semiconductor thermocouple arm of formation thermoelectric pile;
(3) anti-carve N
+GaAs, forming its doping content is 10
17Cm
-3The semiconductor thermocouple arm of thermoelectric pile;
(4) photoetching: removal will keep the local photoresist of gold germanium nickel/gold;
(5) sputter gold germanium nickel/gold, its thickness is altogether
(6) peel off, form the metal thermocouple arm of thermoelectric pile;
(7) photoetching: removal will keep the photoresist in tantalum nitride place;
(8) sputter tantalum nitride, its thickness are 1 μ m;
(9) peel off;
(10) photoetching: removal will keep the photoresist in the place of ground floor gold;
(11) evaporation ground floor gold, its thickness is 0.3 μ m;
(12) peel off, form anchor district, direct current IOB and the metal connecting line of coplanar waveguide transmission line (CPW), asymmetric coplanar striplines (ACPS), ground wire, MEMS clamped beam;
(13) anti-carve tantalum nitride, form terminal resistance, its square resistance is 25 Ω/;
(14) deposit silicon nitride: with plasma-enhanced chemical vapour deposition technology (PECVD) growth
Thick silicon nitride medium layer;
(15) photoetching and etch silicon nitride dielectric layer: be retained in the silicon nitride on the MEMS clamped beam below coplanar waveguide transmission line (CPW);
(16) deposit and photoetching polyimide sacrificial layer: apply the thick polyimide sacrificial layer of 1.6 μ m in gallium arsenide substrate, pit is filled up in requirement, and the thickness of polyimide sacrificial layer has determined MEMS clamped beam and its below distance between the last silicon nitride medium layer of main line coplanar waveguide transmission line (CPW); The photoetching polyimide sacrificial layer only keeps the sacrifice layer of clamped beam below;
(17) evaporation titanium/gold/titanium, its thickness is
: evaporation is used for the down payment of plating;
(18) photoetching: removal will be electroplated local photoresist;
(19) electrogilding, its thickness are 2 μ m;
(20) remove photoresist: removing does not need to electroplate local photoresist;
(21) anti-carve titanium/gold/titanium, the corrosion down payment forms coplanar waveguide transmission line (CPW), asymmetric coplanar striplines (ACPS), ground wire, MEMS clamped beam, direct current IOB and metal connecting line;
(22) with this gallium arsenide substrate thinning back side to 100 μ m;
(23) discharge polyimide sacrificial layer: developer solution soaks, and removes the polyimide sacrificial layer under the MEMS clamped beam, and deionized water soaks slightly, and the absolute ethyl alcohol dehydration is volatilized under the normal temperature, dries;
(24) external voltage controlled oscillator and multiplier.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. frequency divider based on the indirect thermoelectric (al) type power sensor of micromechanics, it is characterized in that: the merit that comprise substrate (1), is arranged on the substrate (1) is closed device and MEMS indirect type microwave power detector and external voltage controlled oscillator and multiplier, at axis of symmetry of substrate (1) definition; Described merit is closed device and is formed along axis of symmetry symmetrical structure, comprises ground wire (2), coplanar waveguide transmission line (3), two sections asymmetric coplanar striplines (4), isolation resistance (5), two groups of clamped beams (12) and anchor district (13); Described MEMS indirect type microwave power detector comprises two groups of terminal resistances (6), metal thermocouple arm (7), semiconductor thermocouple arm (8), metal connecting line (9) and two direct current IOB (10);
Described ground wire (2) forms along axis of symmetry symmetrical structure, comprises that symmetry is positioned at axis of symmetry both sides and not contacted two sections side ground wires, symmetries and is positioned at one section common ground on the axis of symmetry;
Described coplanar waveguide transmission line (3) forms along axis of symmetry symmetrical structure, comprises that two sections input coplanar waveguide transmission lines, symmetries being positioned at axis of symmetry both sides and not being connected are positioned at one section output coplanar waveguide transmission line on the axis of symmetry; Described two sections input coplanar waveguide transmission lines are connected with two sections asymmetric coplanar striplines (4) input respectively; Described two sections asymmetric coplanar striplines (4) input is isolated by isolation resistance (5), inserts the output coplanar waveguide transmission line after described two sections asymmetric coplanar striplines (4) output is connected; Described two sections asymmetric coplanar striplines (4) and isolation resistance (5) form along axis of symmetry symmetrical structure; Conduct is with reference to signal input port and feedback signal input port respectively for described two sections input coplanar waveguide transmission lines, and described output coplanar waveguide transmission line is as signal output port;
Described two groups of clamped beams (12) are separately positioned on both sides and the relative axis of symmetry symmetry of the axis of symmetry, described clamped beam (12) is connected across the top of the input co-planar waveguide hop that is positioned at the same side, and two ends are fixed on ground wire (2) the side ground wire and common ground that is positioned at the same side by anchor district (13) respectively;
Described output coplanar waveguide transmission line is connected by one group of terminal resistance (6) with two sections side ground wires respectively, and described two groups of terminal resistances (6) correspondence respectively are provided with one group of thermocouple; One end of described two groups of thermocouples is connected in series by metal connecting line (9), and the other end is connected with direct current IOB (10) by metal connecting line (9) respectively; One of them direct current IOB (10) is connected with the input of voltage controlled oscillator, another direct current IOB (10) ground connection; Described thermocouple is made up of metal thermocouple arm (7) and semiconductor thermocouple arm (8);
The output of described voltage controlled oscillator links to each other with multiplier input, and the output of described multiplier links to each other with the feedback signal input port.
2. a kind of frequency divider based on the indirect thermoelectric (al) type power sensor of micromechanics according to claim 1, it is characterized in that: be provided with silicon nitride medium layer (11) between described coplanar waveguide transmission line (3) and the clamped beam (12), described silicon nitride medium layer (11) covers on the coplanar waveguide transmission line (3).
3. one kind according to claim 1 based on the preparation method of the frequency divider of the indirect thermoelectric (al) type power sensor of micromechanics, it is characterized in that comprising following steps:
(1) makes gallium arsenide substrate: select the semi-insulating GaAs substrate of extension for use, wherein extension N
+The doping content of GaAs is 10
18Cm
-3, its square resistance is 100～130 Ω/;
(2) photoetching and isolate the N of extension
+GaAs, figure and the ohmic contact regions of the semiconductor thermocouple arm of formation thermoelectric pile;
(3) anti-carve N
+GaAs, forming its doping content is 10
17Cm
-3The semiconductor thermocouple arm of thermoelectric pile;
(4) photoetching: removal will keep the local photoresist of gold germanium nickel/gold;
(5) sputter gold germanium nickel/gold, its thickness is altogether
(6) peel off, form the metal thermocouple arm of thermoelectric pile;
(7) photoetching: removal will keep the photoresist in tantalum nitride place;
(8) sputter tantalum nitride, its thickness are 1 μ m;
(9) peel off;
(10) photoetching: removal will keep the photoresist in the place of ground floor gold;
(11) evaporation ground floor gold, its thickness is 0.3 μ m;
(12) peel off, form anchor district, direct current IOB and the metal connecting line of coplanar waveguide transmission line, asymmetric coplanar striplines, ground wire, MEMS clamped beam;
(13) anti-carve tantalum nitride, form terminal resistance, its square resistance is 25 Ω/;
(14) deposit silicon nitride: with the growth of plasma-enhanced chemical vapour deposition technology
Thick silicon nitride medium layer;
(15) photoetching and etch silicon nitride dielectric layer: be retained in the silicon nitride on the coplanar waveguide transmission line of MEMS clamped beam below;
(16) deposit and photoetching polyimide sacrificial layer: apply the thick polyimide sacrificial layer of 1.6 μ m in gallium arsenide substrate, pit is filled up in requirement, and the thickness of polyimide sacrificial layer has determined MEMS clamped beam and its below in the distance between the silicon nitride medium layer on the main line coplanar waveguide transmission line; The photoetching polyimide sacrificial layer only keeps the sacrifice layer of clamped beam below;
(17) evaporation titanium/gold/titanium, its thickness is
: evaporation is used for the down payment of plating;
(18) photoetching: removal will be electroplated local photoresist;
(19) electrogilding, its thickness are 2 μ m;
(20) remove photoresist: removing does not need to electroplate local photoresist;
(21) anti-carve titanium/gold/titanium, the corrosion down payment forms coplanar waveguide transmission line, asymmetric coplanar striplines, ground wire, MEMS clamped beam, direct current IOB and metal connecting line;
(22) with this gallium arsenide substrate thinning back side to 100 μ m;
(23) discharge polyimide sacrificial layer: developer solution soaks, and removes the polyimide sacrificial layer under the MEMS clamped beam, and deionized water soaks slightly, and the absolute ethyl alcohol dehydration is volatilized under the normal temperature, dries;
(24) external voltage controlled oscillator and multiplier.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598600A (en) * | 2004-09-07 | 2005-03-23 | 东南大学 | Indirect heating terminal type microwave power micro-mechanical sensor and preparation method thereof |
| CN2725900Y (en) * | 2004-09-27 | 2005-09-14 | 东南大学 | Direct heating terminal type microwave power sensor of microelectronic mechanical system |
| CN203313160U (en) * | 2013-06-19 | 2013-11-27 | 东南大学 | Frequency divider based on micromechanical indirect thermoelectric power sensor |
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2013
- 2013-06-19 CN CN201310245644.2A patent/CN103346789B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598600A (en) * | 2004-09-07 | 2005-03-23 | 东南大学 | Indirect heating terminal type microwave power micro-mechanical sensor and preparation method thereof |
| CN2725900Y (en) * | 2004-09-27 | 2005-09-14 | 东南大学 | Direct heating terminal type microwave power sensor of microelectronic mechanical system |
| CN203313160U (en) * | 2013-06-19 | 2013-11-27 | 东南大学 | Frequency divider based on micromechanical indirect thermoelectric power sensor |
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Address after: 210093 Nanjing University Science Park, 22 Hankou Road, Gulou District, Nanjing City, Jiangsu Province Patentee after: Southeast University Address before: 210033 Xigang office, Qixia District, Nanjing, Jiangsu, No. 8, Qi Min Dong Road, Xingshan City, Patentee before: Southeast University |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150909 Termination date: 20190619 |