CN102158239A - Broad-band radio-frequency generation circuit based on VC-TCXO (Voltage Control - Temperature Compensation Crystal Oscillator) array and frequency synthesizing chip - Google Patents
Broad-band radio-frequency generation circuit based on VC-TCXO (Voltage Control - Temperature Compensation Crystal Oscillator) array and frequency synthesizing chip Download PDFInfo
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- CN102158239A CN102158239A CN2010105984244A CN201010598424A CN102158239A CN 102158239 A CN102158239 A CN 102158239A CN 2010105984244 A CN2010105984244 A CN 2010105984244A CN 201010598424 A CN201010598424 A CN 201010598424A CN 102158239 A CN102158239 A CN 102158239A
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Abstract
The invention discloses a broad-band radio-frequency generation circuit based on a VC-TCXO (Voltage Control-Temperature Compensation Crystal Oscillator) array and a frequency synthesizing chip, which comprises a VC-TCXO (Voltage Control - Temperature Compensation Crystal Oscillator) array, a frequency synthesizing chip, a modulator, a direct digital frequency synthesizer, a power controller and a digital processor; the digital processor is connected with the control end of the VC-TCXO (Voltage Control - Temperature Compensation Crystal Oscillator) array, the control end of the frequency synthesizing chip, the control end of the power controller and the input end of the direct digital frequency synthesizer separately; the output end of the VC-TCXO (Voltage Control - Temperature Compensation Crystal Oscillator) array is connected with the reference input end of the frequency synthesizing chip; the output end of the frequency synthesizing chip is connected with the carrier input end of the modulator; the I/Q baseband output end of the direct digital frequency synthesizer is connected with the I/Q baseband input end of the modulator; and the output end of the modulator is connected with the signal input end of the power controller. The broad-band radio-frequency generation circuit has the advantages of wide output frequency range, high frequency resolution, low noise coefficient, good stray performance and the like.
Description
Technical field
The present invention relates to a kind of design and realization of the wide band radio-frequency generation circuit based on VC-TCXO array and frequency synthesis chip.
Background technology
In modern communication systems, the frequency stability and the accuracy of communication equipment all there is very high requirement.Radio-frequency signal generator is a critical equipment indispensable in system design and the debug process.
Initial radio-frequency signal generator is the crystal oscillator that utilizes one or more high stability, through operations such as frequency multiplication, frequency division and mixing, produces the output signal of series of discrete.This scheme signal stabilization degree height, frequency translation speed is fast, but debug difficulties, spuious wayward, output resolution ratio is low.
Along with the continuous development of PHASE-LOCKED LOOP PLL TECHNIQUE, the radio-frequency signal generator of a new generation is widely used.This scheme is used negative-feedback principle, under the effect of single definite reference source, produces required various frequency components, greatly reduces design difficulty, and has improved the output signal frequency scope.
Yet, adopt its output frequency resolution rate of radio-frequency signal generator of phase-locked loop scheme still to be restricted at present.
The appearance of direct digital frequency synthesis technology makes the possibility that is designed to of high-resolution signal generating circuit.But it exports spuious more serious, and output frequency is lower, is not used for the generation of carrier signal at present as yet.
Summary of the invention
The object of the invention is to provide the radio frequency generation circuit based on VC-TCXO array and frequency synthesis chip in a kind of high output frequency resolution rate, broadband.
For achieving the above object, the technical solution used in the present invention is: its wide band radio-frequency generation circuit based on VC-TCXO array and frequency synthesis chip comprises VC-TCXO array, frequency synthesis chip, modulator, Direct Digital Frequency Synthesizers, power controller and digital processing unit; Described digital processing unit is connected respectively with the control end of described VC-TCXO array, the control end of frequency synthesis chip, the control end of power controller and the input of Direct Digital Frequency Synthesizers, the output of described VC-TCXO array is connected with the reference input of frequency synthesis chip, the output of frequency synthesis chip is connected with the carrier wave input of modulator, the I/Q base band output of Direct Digital Frequency Synthesizers is connected with the I/Q base band input of modulator, and the output of modulator is connected with the signal input part of power controller.
Further, modulator of the present invention adopts the quadrature modulation framework.
Further, power controller of the present invention adopts the automated power control architecture.
Compared with prior art, the beneficial effect that the present invention has is: it is wide that this circuit has reference frequency output, and frequency resolution height, noise factor hang down and advantages such as spurious performance is good.
Description of drawings
Fig. 1 is a structural representation block diagram of the present invention;
Fig. 2 is the theory diagram of frequency synthesis chip.
Fig. 3 is the theory diagram of Direct Digital Frequency Synthesizers.
Fig. 4 is the theory diagram of modulator.
Fig. 5 is the theory diagram of power controller.
Embodiment
Further set forth the present invention below in conjunction with the drawings and specific embodiments.
Figure 1 shows that structural representation block diagram of the present invention, should mainly comprise based on the wide band radio-frequency generation circuit of VC-TCXO array and frequency synthesis chip: VC-TCXO array, frequency synthesis chip, modulator, Direct Digital Frequency Synthesizers, power controller and digital processing unit.Wherein, digital processing unit is connected respectively with the control end of VC-TCXO array, control end and the control end of power controller and the input of Direct Digital Frequency Synthesizers of frequency synthesis chip, the output of VC-TCXO array is connected with the reference input of frequency synthesis chip, the output of frequency synthesis chip is connected with the carrier wave input of modulator, the I/Q base band output of Direct Digital Frequency Synthesizers is connected with the I/Q base band input of modulator, and the output of modulator is connected with the signal input part of power controller.
Among the present invention, the VC-TCXO array can be selected the temperature compensating crystal oscillator of DSB321SDA or DSA221SDA series for use.The frequency synthesis chip can use commercial phase-locked loop chip to build, and its theory diagram as shown in Figure 2.The frequency synthesis chip can be selected commercial phase-locked loop chip for use, the ADF4350 of Analog Device company for example, and this chip is the broadband frequency synthesizer chip of integrated voltage controlled oscillator, its reference frequency output is that 137.5MHz is to 4400MHz.The Direct Digital Frequency Synthesizers theory diagram can use FPGA and memory to realize as shown in Figure 3, perhaps uses commercial Direct Digital frequency synthesis chip, as the AD9834 of Analog Device company production.Power controller generally adopts the automated power control architecture, and its theory diagram as shown in Figure 5.Digital processing unit can use the embedded processing systems based on microprocessor, DSP or FPGA to realize.
As shown in Figure 2, the frequency synthesis chip adopts the phase-locked loop framework, and its digital input end connects digital processing unit, and its reference input connects the VC-TCXO array, the carrier wave input of carrier wave output termination modulator.Frequency divider carries out the Fractional-N frequency operation to the output of voltage controlled oscillator; Phase discriminator after to frequency division signal and compare with reference to input, its comparative result acts on voltage controlled oscillator again through behind loop filter.Under the effect of negative feedback mechanism, carrier signal finally lock onto with reference to the N of incoming frequency doubly on.When the output resolution ratio of frequency synthesis chip reached output and requires, digital processing unit was revised the frequency dividing ratio N of frequency divider by revising the content in its frequency register, reaches the purpose that changes output frequency; When the output resolution ratio of frequency synthesis chip itself can't reach output and requires, then reach the purpose that changes output frequency with reference to importing by revising it.
As shown in Figure 3, the input of the numeral of Direct Digital Frequency Synthesizers connects digital processing unit, and the output of I/Q base band connects the I/Q base band input of modulator.Under the clock effect that reference source provides, phase accumulator constantly upgrades output according to the numerical value in the frequency register; Visit sine lookup table and cosine look-up table with its output as the address afterwards, and the data in this address are sent to digital to analog converter; The digital-to-analogue converter then generates required I/Q baseband signal according to its input.Digital processing unit is controlled the output frequency of Direct Digital frequency synthesis by revising its frequency register.
As shown in Figure 4, modulator adopts the quadrature modulation framework, and its carrier wave input connects the carrier wave output of frequency synthesis chip, and the input of I/Q base band connects the I/Q base band output of Direct Digital Frequency Synthesizers.The carrier wave of input is divided into two-way by power; Wherein one the tunnel through after the 90 degree phase shifts, carries out mixing operation with the tape input of I roadbed; Other one the tunnel directly and the tape input of Q roadbed carry out mixing operation; It is one the tunnel that result after the mixing is synthesized again, as modulation output.
As shown in Figure 5, power controller adopts the automated power control architecture, and its numeral input connects digital processing unit, and the signal input connects the modulation output of modulator.Power adjustments is adjusted to input signal near the standard peak power output earlier; Power detection is used for the output of power adjustments is sampled; After this sampled result is amplified through driver, compare with the peak power output of standard; Power adjustments is constantly finely tuned its power output again according to comparative result, up to this power with till the peak power output of standard equates; Digital processing unit is regulated the power of output signal by the control output pad.
The operation principle of broadband rf signal generation circuit of the present invention is as follows:
Under the control of digital processing unit, the VC-TCXO array provides 10MHz reference signal for the frequency synthesis chip.Digital processing unit is controlled the frequency of outgoing carrier signal by the frequency register of write frequency composite chip.When the output frequency resolution rate of frequency synthesis chip reaches output and requires,, revise carrier frequency by revising the frequency register of frequency synthesis chip.When the output frequency resolution rate of frequency synthesis chip can't reach output and requires, digital processing unit is by the mode of fine setting VC-TCXO array output, revise carrier frequency, this makes the resolution of output frequency of wide band radio-frequency generation circuit of the present invention be improved.Because the frequency synthesis chip in the wide band radio-frequency generation circuit of the present invention adopts the phase-locked loop framework, make the frequency that the present invention exported have the low and good advantage of spurious performance of noise factor simultaneously.When needs carry out modulation operations to output signal, the baseband signal that the output of digital processor controls Direct Digital frequency synthesis chip is required, modulator is finished the modulation operations of baseband signal to carrier signal.Under the control of digital processing unit, power controller is regulated the power of output signal.
Claims (3)
1. the wide band radio-frequency generation circuit based on VC-TCXO array and frequency synthesis chip is characterized in that: comprise VC-TCXO array, frequency synthesis chip, modulator, Direct Digital Frequency Synthesizers, power controller and digital processing unit; Described digital processing unit is connected respectively with the control end of described VC-TCXO array, the control end of frequency synthesis chip, the control end of power controller and the input of Direct Digital Frequency Synthesizers, the output of described VC-TCXO array is connected with the reference input of frequency synthesis chip, the output of frequency synthesis chip is connected with the carrier wave input of modulator, the I/Q base band output of Direct Digital Frequency Synthesizers is connected with the I/Q base band input of modulator, and the output of modulator is connected with the signal input part of power controller.
2. a kind of wide band radio-frequency generation circuit based on VC-TCXO array and frequency synthesis chip according to claim 1 is characterized in that: described modulator adopts the quadrature modulation framework.
3. a kind of wide band radio-frequency generation circuit based on VC-TCXO array and frequency synthesis chip according to claim 1 and 2 is characterized in that: described power controller adopts the automated power control architecture.
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| CN 201010598424 CN102158239B (en) | 2010-12-21 | 2010-12-21 | Broad-band radio-frequency generation circuit based on VC-TCXO (Voltage Control - Temperature Compensation Crystal Oscillator) array and frequency synthesizing chip |
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| CN 201010598424 CN102158239B (en) | 2010-12-21 | 2010-12-21 | Broad-band radio-frequency generation circuit based on VC-TCXO (Voltage Control - Temperature Compensation Crystal Oscillator) array and frequency synthesizing chip |
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| CN102158239A true CN102158239A (en) | 2011-08-17 |
| CN102158239B CN102158239B (en) | 2013-10-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749957A (en) * | 2012-06-20 | 2012-10-24 | 中国科学院空间科学与应用研究中心 | Linear frequency modulation signal generation device for satellite borne equipment |
| CN106603093A (en) * | 2016-11-14 | 2017-04-26 | 成都合立微波技术有限公司 | Frequency synthesis wireless output device |
| CN109302241A (en) * | 2017-12-12 | 2019-02-01 | 上海创远仪器技术股份有限公司 | A kind of vector signal generation device and method based on chip |
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| CN1825137A (en) * | 2006-03-23 | 2006-08-30 | 河海大学 | Ground GPS signal transmitter |
| CN101008976A (en) * | 2006-01-23 | 2007-08-01 | 上海飞乐音响股份有限公司 | Distant contactless IC card read/write implement and method therefor |
| CN101261687A (en) * | 2008-03-20 | 2008-09-10 | 重庆微标科技有限公司 | Ultrahigh frequency miniature RFID reader/writer module |
| CN101847992A (en) * | 2009-12-31 | 2010-09-29 | 南京国睿安泰信科技股份有限公司 | Frequency synthesis system for enhancing spectrum purity of direct digital frequency synthesizer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101008976A (en) * | 2006-01-23 | 2007-08-01 | 上海飞乐音响股份有限公司 | Distant contactless IC card read/write implement and method therefor |
| CN1825137A (en) * | 2006-03-23 | 2006-08-30 | 河海大学 | Ground GPS signal transmitter |
| CN101261687A (en) * | 2008-03-20 | 2008-09-10 | 重庆微标科技有限公司 | Ultrahigh frequency miniature RFID reader/writer module |
| CN101847992A (en) * | 2009-12-31 | 2010-09-29 | 南京国睿安泰信科技股份有限公司 | Frequency synthesis system for enhancing spectrum purity of direct digital frequency synthesizer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749957A (en) * | 2012-06-20 | 2012-10-24 | 中国科学院空间科学与应用研究中心 | Linear frequency modulation signal generation device for satellite borne equipment |
| CN102749957B (en) * | 2012-06-20 | 2015-04-15 | 中国科学院空间科学与应用研究中心 | Linear frequency modulation signal generation device for satellite borne equipment |
| CN106603093A (en) * | 2016-11-14 | 2017-04-26 | 成都合立微波技术有限公司 | Frequency synthesis wireless output device |
| CN109302241A (en) * | 2017-12-12 | 2019-02-01 | 上海创远仪器技术股份有限公司 | A kind of vector signal generation device and method based on chip |
| CN109302241B (en) * | 2017-12-12 | 2023-12-01 | 上海创远仪器技术股份有限公司 | Chip-based vector signal generating device and method |
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