CN1183672A - Wideband vector modulator - Google Patents
Wideband vector modulator Download PDFInfo
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- CN1183672A CN1183672A CN 95120384 CN95120384A CN1183672A CN 1183672 A CN1183672 A CN 1183672A CN 95120384 CN95120384 CN 95120384 CN 95120384 A CN95120384 A CN 95120384A CN 1183672 A CN1183672 A CN 1183672A
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Abstract
A wideband vector modulator comprises a local oscillator; a plurality of quadrature-phase-shift-key modulator elements, which receive signal derived from the oscillator and are coupled to receive first and second digital input signals; a plurality of summing devices that are coupled to the selected modulator elements, one summing device providing an analog constellation output signal of the vector modulator; a plurality of attenuators, which are coupled between the selected modulator elements and between output of a selected modulator elements and a selected summing device, providing for amplitude weighting output signals from the plurality of modulator elements.
Description
With reference to granting the U.S. Patent No. 5,237,292 of Chethik. exercise question for " the quadrature amplitude modulation system that has the transmission system performance compensation ".
The present invention relates to vector modulator, particularly wideband vector modulator, this modulator uses the output of the gallium arsenide integrated circuit and a plurality of Quadrature Phase Shift Keying (the QPSK)-modulator unit of suing for peace.Each quadrature phase shift key control device unit is by two numeral inputs and a local oscillator control.
Grant Chethik's and the U.S. Patent No. 5,237,292 that transfers the assignee of the present invention discloses a quadrature amplitude modulation system that can use vector modulator of the present invention.In this system, digital signal is converted into phase place and the periodically variable analog signal of amplitude and is coupled on the output line, this system is adaptive and comprises a plurality of simple orthorhombic phase-shift keying modulators, each modulator has a plurality of control figure inputs, its state decision output is which phase shift signalling, and a local oscillator provides the sinusoidal signal of one-period to each qpsk modulator.Add circuit makes up the output of these modulators to produce the conformation of phase place and changes in amplitude output sinusoidal signal.The combination of processor/map mechanism makes it possible to convert first group of numeral input to another group numeral output according to a control input, therefore, the conversion that processor can be exported conformation according to a control, it has represented the situation of transmission equipment.
Therefore, the patent disclosure of Chethik a kind of quadrature amplitude modulation system that uses the Quadrature Phase Shift Keying vector modulator.But this patent does not have openly or provides the usage of the GaAs microwave monolithic integrated circuit of realizing that quadrature phase shift keyed modulators is required.
Other referenced patent that disclose vector modulator comprise the U.S. Patent No. 4 that the U.S. Patent No. 4,168,397 of authorizing Bradley is authorized Bremer, 464,767, the U.S. Patent No. 4 of authorizing Lodset al., 571,549, the U.S. Patent No. 4 of authorizing Ohmagari, 930,141, the U.S. Patent No. 4 of authorizing Edwardsetal., 843,351 and the U.S. Patent No. 4,999,590 of authorizing Verdot.
Thereby an object of the present invention is to provide a kind of quadrature amplitude modulation system that has used based on the vector modulator of GaAs, further purpose provides the wideband vector modulator that has used gallium arsenide integrated circuit, also have another purpose to provide a kind of broadband GaAs vector modulator, wherein the output of each quadrature phase shift keyed modulators unit is by two numeral inputs and a local oscillator control.
For realizing above-mentioned and other purpose, the present invention includes a wideband vector modulator of using gallium arsenide integrated circuit, it has comprised a plurality of Quadrature Phase Shift Keying (QPSK) modulating unit, and each QPSK modulating unit is by two digital input signals and a local oscillator control.Each QPSK modulating unit has formed GaAs microwave monolithic integrated circuit.
Wideband vector modulator comprises local oscillator and a plurality of Quadrature Phase Shift Keying (QPSK) modulator unit that the cycle positive blending output signal is provided, these modulator units are coupled to respectively on the local oscillator receiving the cycle sine output signal from the there, and are coupled respectively and add the first and second control figure input signals there with reception.The state of corresponding digital input signal has determined that the output of current qpsk modulator is which state in four phase states.A plurality of adders are coupled in the output of selected modulating unit, and selected adder provides the output signal of vector modulator simulation conformation, a plurality of attenuators be coupling between the selected modulator element and the output of a selected modulator element and selected adder between so that the output signal from a plurality of modulation elements is carried out amplitude weighting.Wideband vector modulator under modulation element two digital input signals and the control of local oscillator separately, the output of a plurality of modulator elements of suing for peace.Digital input signals is converted to the periodically variable analog signal of phase place and amplitude, these analog signals have constituted the output signal of vector modulator simulation conformation.In a second embodiment, power divider is coupled between local oscillator and a plurality of qpsk modulator element and a power combiner is used to make up the summed output signal from the qpsk modulator unit.A plurality of ratio attenuators are coupled between qpsk modulator and the power combiner so that the output signal from a plurality of modulator units is carried out amplitude weighting.
Each qpsk modulator unit is made of a GaAs microwave monolithic integrated circuit, this GaAs microwave monolithic integrated circuit comprises one 90 ° coupler, it is positioned at first and second input amplifiers that are used for receiving and amplifying the cycle sinusoidal signal that comes from local oscillator respectively, and be used for respectively receiving and amplify I and Q data input signal with before first and second data amplifiers that the I that amplified and Q data input signal are provided, first and second blenders multiply each other with the local oscillator signals that will amplify and I and Q data input signal with the output coupling of first and second input amplifiers and first and second data amplifiers respectively.The corresponding output coupling of adder and blender is to produce the modulated output signal of modulator unit.
In the course of the work, digital signal is converted to phase place and the periodically variable analog signal of amplitude by vector modulator and is coupled on the output line, and wideband vector modulator comprises a plurality of GaAs microwave monolithic integrated circuit (GaAs MMIC) Quadrature Phase Shift Keying (QPSK) modulator.Local oscillator to each qpsk modulator provide one-period sinusoidal input signal, each qpsk modulator has two control figure inputs, in four phase states which its state decision qpsk modulator be output as, the output of a plurality of qpsk modulators is by amplitude weighting and summation then, to form the output of wideband vector modulator, this output comprises the conformation of a phase place and amplitude sinusoidal variations signal, and it has 2
NPlant the possible phase place and the combination of amplitude, wherein N is the number of digital control input.(each qpsk modulator has two digital control inputs).
The present invention is made by directly produce the amplitude/phase vector in the microwave frequency band with kilomegabit message transmission rate.Do not need the up-conversion signal processing.Carrier frequency is on microwave frequency, and input data rate is in thousands of megabit scopes, and wideband vector modulator has used GaAs MMIC so that wide bandwidth and smaller volume to be provided.
Can understand characteristics of the present invention and advantage better with reference to the following detailed description that combines with accompanying drawing, identical in the accompanying drawings label is represented identical structural detail.
Fig. 1 is the sketch of wideband vector modulator first embodiment in accordance with the principles of the present invention;
Fig. 2 is the sketch according to wideband vector modulator second embodiment of the principle of the invention;
Fig. 3 is the detail drawing that is applied in the qpsk modulator in the wideband vector modulator illustrated in figures 1 and 2.
With reference to accompanying drawing, Fig. 1 is the block diagram of first embodiment of a quadrature amplitude modulation system 10, and this system has used a wideband vector modulator 12 according to principle of the present invention.Wideband vector modulator 12 comprises a local oscillator 11, it and a plurality of Quadrature Phase Shift Keying (QPSK) modulator unit 12a-12e are coupled, local oscillator 11 provides one-period property sinusoidal input to each qpsk modulator unit 12a-12e, and each Quadrature Phase Shift Keying (QPSK) modulator unit 12a-12e has two control figure input signal (D that impose on it
1, D
2D
3, D
4D
5, D
6D
7, D
8D
9, D
10) be appreciated that the number of modulator unit 12a-12e can increase according to the needs of special applications or reduce.
Digital input signals (D
1, D
2D
3, D
4D
5, D
6D
7, D
8D
9, D
10) state determined qpsk modulator 12 to be output as which in four phase states.Except last Quadrature Phase Shift Keying (QPSK) modulator unit 12e, the output of Quadrature Phase Shift Keying (QPSK) modulator unit 12a-12d is coupled with the input of corresponding a plurality of adder 13a-13d respectively; A plurality of attenuator 14a-14d (for example-6dB) by corresponding be coupled between the adder 13a-13d and the output of last modulator unit 12e and last adder 13d between, the output of first adder 13a provides and has exported the simulation conformation output signal that line 15 is coupled.
In the course of the work, digital input signals (D
1, D
2D
3, D
4D
5, D
6D
7, D
8D
9, D
10) converted to phase place and the periodically variable analog signal of amplitude (simulation conformation output signal) and be coupled to output line 15b by wideband vector modulator 12.Wideband vector modulator 12 uses a plurality of GaAs microwave monolithic integrated circuits (GaAs MMIC) device as Quadrature Phase Shift Keying (QPSK) modulator unit 12a-12e.Local oscillator 11 provides one-period sinusoidal input to each QPSK modulating unit 12a-12e, and each qpsk modulator unit 12a-12e has two control figure input (D
1, D
2D
3, D
4D
5, D
6D
7, D
8D
9, D
10), its state has determined qpsk modulator 12 to be output as which in four phases.The output of a plurality of then qpsk modulators unit 12a-12e is attenuated device 14a-14d amplitude weighting and sues for peace in adder 13a-13d, has formed the analog output signal of wideband vector modulator 12.This analog output signal comprises the sinusoidal signal conformation that a phase place and amplitude replace, and it has 2
NPlant the combination of possible phase place and amplitude, wherein N is the number (D of digital input signals
1, D
2D
3, D
4D
5, D
6D
7, D
8D
9, D
10), and each qpsk modulator unit 12a-12e has used two digital control inputs.
Fig. 2 is the block diagram of second embodiment of the 10a of quadrature amplitude modulation system, this system applies wideband vector modulator 12 according to the principle of the invention '.In this second embodiment, wideband vector modulator 12 ' comprise a power divider 16, its input is coupled with local oscillator 11, and a plurality of outputs of power divider 16 are coupled with corresponding qpsk modulator unit 12a-12e respectively.Directly coupling and remaining qpsk modulator unit 12b-12e is coupled by attenuator 14b-14e and power combiner 17 of qpsk modulator unit 12a and power combiner 17.Power combiner will combine from the corresponding signal of each qpsk modulator unit 12a-12e so that the frequency spectrum output signal once modulation to be provided.In fact, power combiner 17 has replaced a plurality of adder 13a-13d among first embodiment of wideband vector modulator 12, the output of power combiner 17 is modulated frequency spectrum output signals, and it has constituted the simulation conformation output signal that is coupled with the output line.
Fig. 3 has represented the concrete structure of a kind of typical QPSK modulating unit 12a, it can be applied in wideband vector modulator illustrated in figures 1 and 2 12,12 ' in, as shown in Figure 3, among the qpsk modulator unit 12a-12e each is made of a GaAs microwave monolithic integrated circuit, qpsk modulator unit 12a is made of 90 ° of couplers 21, and the back of this coupler 21 is connected with and is used to receive and amplifies first and second input amplifiers 22 from the cycle sinusoidal signal of local oscillator 11.First input of the output of each amplifier 22 and respective mixer 24 is coupled, and I and Q data input signal are amplified by corresponding second amplifier 23 and be loaded in second input of respective mixer 24.Blender 24 multiplies each other the local oscillator signals that amplifies with I and Q data input signal, it is exported accordingly and is loaded on the adder 25, and adder 25 provides modulated output signal for modulator unit 12a.
Therefore, we have described a kind of new, improved wideband vector modulator in detail.This modulator has used gallium arsenide integrated circuit and the output of a plurality of quadrature phase shift keyed modulators unit of suing for peace, and each modulator unit is by two numeral inputs and a local oscillator control.Be appreciated that above-described embodiment is the explanation to some specially for carrying out examples of the utilization principle of the invention, to those skilled in the art, other invention of making in the scope of the invention is conspicuous.
Claims (6)
1. wideband vector modulator comprises:
A local oscillator provides the cycle sine output signal;
A plurality of Quadrature Phase Shift Keying (QPSK) modulator unit, respectively with local oscillator coupling to receive from the cycle sine output signal at this place and the first and second control figure input signals (D) that are coupled respectively and load on it to receive, in four phases which what wherein the state of corresponding digital input signal (D) determined this qpsk modulator currently is output as;
A plurality of adders be coupled with the output of selected modulator unit, and one of them selected adder provide the simulation conformation output signal of a vector modulator; And
A plurality of attenuators, be coupled between the selected modulator unit and the output of a selected modulator unit and selected adder between, to carrying out amplitude weighting from the output signal of a plurality of qpsk modulators unit;
Wherein wideband vector modulator is under two digital input signals (D) and local oscillator control separately, the output of a plurality of Quadrature Phase Shift Keying of suing for peace (QPSK) modulator element is to convert digital input signals (D) to the analog signal that phase place and amplitude cycle change, and this signal contains the simulation conformation output signal of vector modulator.
2. wideband vector modulator as claimed in claim 1 is characterized in that, each qpsk modulator unit is made of a GaAs microwave monolithic integrated circuit.
3. wideband vector modulator as claimed in claim 1 is characterized in that, each qpsk modulator unit comprises a GaAs microwave monolithic integrated circuit, and it comprises:
90 ° of couplers;
First and second input amplifiers are coupled to receive and to amplify cycle sinusoidal signal from local oscillator with 90 ° of couplers respectively;
First and second data amplifiers receive respectively and amplify I and I and the Q data input signal of Q data input signal so that amplification to be provided;
First and second blenders, the output with first and second input amplifiers and first and second data amplifiers is coupled respectively, multiplies each other with the local oscillator signals that will amplify and I and Q data input signal; And
An adder is coupled with the corresponding output of blender, to produce the modulated output signal of a modulator unit.
4. wideband vector modulator comprises:
A local oscillator provides the one-period sine output signal;
A power divider has an input and an a plurality of output that is coupled with local oscillator;
A plurality of Quadrature Phase Shift Keying (QPSK) modulator unit, a plurality of outputs with power divider are coupled respectively, to receive from the cycle sine output signal of local oscillator and to receive the first and second control figure input signals (D) that load on it respectively; Wherein which in four phases the state of respective digital input signal (D) decision qpsk modulator current be output as;
A plurality of attenuators are coupled with to the amplitude output signal weighting from a plurality of modulator units with the output of selected modulator unit; And
A power combiner is coupled with the output of qpsk modulator unit, is used to make up the corresponding output signal from this place, and the modulation spectrum output signal of a vector modulator is provided;
Wherein wideband vector modulator is imported under the control of (D) and a local oscillator in their two numerals separately, the output of a plurality of Quadrature Phase Shift Keying of suing for peace (QPSK) modulator unit, digital input signals is converted to the periodically variable analog signal of phase place and amplitude, this signal contains the simulation conformation output signal of vector modulator.
5. wideband vector modulator as claimed in claim 4 is characterized in that: each qpsk modulator unit is made of a GaAs microwave monolithic integrated circuit.
6. wideband vector modulator as claimed in claim 1 is characterized in that: each qpsk modulator unit comprises a GaAs microwave monolithic integrated circuit, and it comprises:
90 ° of couplers;
First and second input amplifiers, with the coupling of 90 ° of couplers to receive respectively and to amplify cycle sinusoidal signal from local oscillator;
First and second data amplifiers are used for receiving respectively and amplify I and I and the Q data input signal of Q data input signal so that amplification to be provided;
First and second blenders are coupled in the output of first and second input amplifiers and first and second data amplifiers respectively, are used for the local oscillator signals that will amplify and I and Q data input signal and multiply each other; And
An adder is coupled with the corresponding output of blender, to produce the modulated output signal of a modulator unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95120384A CN1074608C (en) | 1995-10-30 | 1995-10-30 | Wideband vector modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95120384A CN1074608C (en) | 1995-10-30 | 1995-10-30 | Wideband vector modulator |
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| Publication Number | Publication Date |
|---|---|
| CN1183672A true CN1183672A (en) | 1998-06-03 |
| CN1074608C CN1074608C (en) | 2001-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95120384A Expired - Fee Related CN1074608C (en) | 1995-10-30 | 1995-10-30 | Wideband vector modulator |
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| Country | Link |
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| CN (1) | CN1074608C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107241064A (en) * | 2017-05-22 | 2017-10-10 | 中国电子科技集团公司第四十研究所 | A kind of top bottom power can fine adjustment nonreturn-to-zero pulse signal generating method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5075643A (en) * | 1990-12-24 | 1991-12-24 | Motorola, Inc. | Frequency modulator |
| US5369378A (en) * | 1992-02-13 | 1994-11-29 | Sanyo Electric Co., Ltd. | Digital DQPSK modulator |
| US5237292A (en) * | 1992-07-01 | 1993-08-17 | Space Systems/Loral | Quadrature amplitude modulation system with compensation for transmission system characteristics |
| US5392460A (en) * | 1993-04-23 | 1995-02-21 | Nokia Mobile Phones Ltd. | Dual mode radiotelephone terminal selectively operable for frequency modulated or phase modulated operation |
-
1995
- 1995-10-30 CN CN95120384A patent/CN1074608C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107241064A (en) * | 2017-05-22 | 2017-10-10 | 中国电子科技集团公司第四十研究所 | A kind of top bottom power can fine adjustment nonreturn-to-zero pulse signal generating method |
| CN107241064B (en) * | 2017-05-22 | 2020-12-01 | 中国电子科技集团公司第四十一研究所 | Non-return-to-zero pulse signal generation method with precisely adjustable top and bottom power |
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| Publication number | Publication date |
|---|---|
| CN1074608C (en) | 2001-11-07 |
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