CN201414119Y - Comb spectrum generating circuit - Google Patents
Comb spectrum generating circuit Download PDFInfo
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- CN201414119Y CN201414119Y CN 200920159235 CN200920159235U CN201414119Y CN 201414119 Y CN201414119 Y CN 201414119Y CN 200920159235 CN200920159235 CN 200920159235 CN 200920159235 U CN200920159235 U CN 200920159235U CN 201414119 Y CN201414119 Y CN 201414119Y
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Abstract
The utility model discloses a comb spectrum generating circuit, comprising a frequency dividing circuit, a frequency hybrid circuit and a converter circuit, which are connected sequentially. An inputend of the frequency dividing circuit is connected with a frequency stepping reference source. The converter circuit outputs the comb spectrum. Applying the technical scheme, the stepping of the combspectrum can be adjusted flexibly by setting a radio frequency reference signal frequency, the amplitude of a simple spectrum signal can be adjusted independently through a resistor type attenuator; furthermore the utility model has the advantages of lower phase noise, being suitable for a high frequency circuit, and capability of greatly improving the comprehensive performance index and predictability of products, and effectively reducing difficulties of fabrication and debugging of the circuit.
Description
Technical field
The utility model relates to a kind of signal generator, and especially a kind of pectination spectrum produces circuit.
Background technology
At present, it generally is to adopt the mode of snap-off diode or crystal oscillator to realize that the pectination spectrum produces circuit, as shown in Figure 1.For the circuit that produces the pectination spectrum with snap-off diode, input reference frequency is in case determine, the stepping of pectination spectrum also is fixed up thereupon, can't regulate stepping flexibly, and the pectination that obtains spectrum waveform is made up of the each harmonic of input reference frequency, rising along with frequency, it is very little that high-end signal power will become, can not obtain the pectination spectrum signal of seven amplitude unanimities, therefore, the amplitude of the pectination spectrum that this circuit produces and the restriction that stepping all is subjected to input reference frequency only are suitable for low-frequency channel.
Form seven line pectinations spectrum with crystal oscillator in addition and produce circuit, as shown in Figure 2, need to use seven crystal oscillators and seven resistor-type attenuators, the circuit structure complexity, and the price of crystal oscillator is higher, thereby causes the rising of production cost, has also increased the difficulty of debugging simultaneously.Because the crystal oscillator output frequency at most also has only the hundreds of megahertz, therefore, also is not suitable for high-frequency circuit.
The utility model content
The purpose of this utility model provide a kind of be applicable to high-frequency circuit, can the flexible stepping, the independent pectination spectrum of adjusting amplitude produces circuit.
In order to reach described purpose, the utility model adopts following technical scheme:
A kind of pectination spectrum produces circuit, and it is characterized in that: it comprises frequency dividing circuit, frequency mixing circuit and the frequency changer circuit that connects successively; Wherein the input of frequency dividing circuit is connected with the frequency step reference source; Frequency changer circuit output pectination spectrum.
Wherein frequency dividing circuit comprises more than one frequency divider; Frequency mixing circuit comprises more than one resistor-type attenuator, and the resistance hybrid network that is connected with each resistor-type attenuator output; Frequency changer circuit is a double balanced mixer.
Quantity in the resistor-type attenuator in frequency divider in the frequency dividing circuit and the described frequency mixing circuit is consistent.
The beneficial effects of the utility model are:
Adopt technique scheme, can do flexible to the stepping of pectination spectrum by radio frequency reference signal frequency Δ F is set, the amplitude of simple spectrum signal also can be done independently by the resistor-type attenuator and adjust, can obtain phase noise preferably, go for high-frequency circuit, increase substantially The comprehensive performance index and productibility, reduced the difficulty of circuit production and debugging effectively.
Description of drawings
Fig. 1 produces the theory diagram of circuit for existing pectination spectrum;
Fig. 2 is the theory diagram that existing another pectination spectrum produces circuit;
Fig. 3 is a theory diagram of the present utility model;
Fig. 4 is an electric theory diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is elaborated.
Embodiment 1: as shown in Figure 3 and Figure 4, the signal of frequency step reference source is input to frequency dividing circuit, and signal is through incoming frequency hybrid circuit behind the frequency dividing circuit, then through output pectination spectrum signal after frequency changer circuit and the local oscillation signal mixing.Here in the frequency dividing circuit, select one 6 frequency divider, one 3 frequency divider, one 2 frequency divider.
The radiofrequency signal Δ F that is provided by the External Reference source gives program control 6 frequency divider 1a, program control 3 frequency divider 1b, program control 2 frequency divider 1c respectively.Radiofrequency signal Δ F is through behind the program control 6 frequency divider 1a, and signal frequency is become original 1/6 times by frequency division, and the output signal frequency of program control 6 frequency divider 1a is Δ F/6; Radiofrequency signal Δ F through 3 frequency divider 1b after, signal frequency is become original 1/3 times by frequency division, the output signal frequency of program control 3 frequency divider 1b is 2 Δ F/6; Radiofrequency signal Δ F through 2 frequency divider 1c after, signal frequency is become original 1/2 times by frequency division, the output signal frequency of program control 2 frequency divider 1c is 3 Δ F/6; Then frequency divider 1a, 1b, 1c output are connected respectively to resistor-type attenuator 2a, the resistor-type attenuator 2b in the frequency mixing circuit, the input of resistor-type attenuator 2c.
Frequency mixing circuit comprises resistor-type attenuator 2a, resistor-type attenuator 2b, resistor-type attenuator 2c and resistance hybrid network 3.The resistor-type attenuator can be decayed large-signal, so that back level signal receives.Therefore, in order to observe complete seven a line pectinations spectrum waveform, the output signal of programmable frequency divider 1a, 1b, 1c is connected a resistor-type attenuator respectively, regulate three road signal amplitudes by the attenuation that changes resistor-type attenuator 2a, resistor-type attenuator 2b, resistor-type attenuator 2c, to satisfy the demand of design.Three road signals that resistor- type attenuator 2a, 2b, 2c are come out are sent to resistance hybrid network 3 and synthesize one road signal then, and are connected to the input of double balanced mixer 4.
The output signal of resistance hybrid network 3 is sent into double balanced mixer 4 inputs in the frequency mixing circuit, the local oscillation signal F that is provided by External Reference
0For double balanced mixer 4 provides drive signal, both carry out mixing in double balanced mixer, and the signal frequency that mixing is come out is:
Because the imperfection of double balanced mixer just has local oscillation signal F
0Directly leak out, therefore, just can obtain with F at the output of double balanced mixer 4
0Be seven equally spaced simple spectrum frequency signals that centre frequency is symmetrically distributed, be seven line pectinations spectrum, its minimum step is
And can adjust minimum step by adjustment Δ F is
Value.Simultaneously, the amplitude of seven simple spectrum signals can be done independent adjustment according to user's demand, the attenuation that only needs to change corresponding resistor-type attenuator in the frequency mixing circuit just can be adjusted to desired value to the power magnitude of signal spectrum, simultaneously can obtain phase noise preferably, this circuit not only goes for low-frequency channel, also goes for high-frequency circuit.
Certainly, the pectination spectrum that requires for difference, pectination spectrums such as that quantity that can be by selecting frequency divider and frequency division recently produce is three-way, five lines, seven lines, more than all drop within the protection range of the present utility model.
Claims (6)
1, a kind of pectination spectrum produces circuit, it is characterized in that: described pectination spectrum produces circuit and comprises frequency dividing circuit, frequency mixing circuit and the frequency changer circuit that connects successively; The input of wherein said frequency dividing circuit is connected with the frequency step reference source; Described frequency changer circuit output pectination spectrum.
2, pectination spectrum according to claim 1 produces circuit, and it is characterized in that: described frequency dividing circuit comprises more than one frequency divider.
3, pectination spectrum according to claim 1 and 2 produces circuit, and it is characterized in that: described frequency mixing circuit comprises more than one resistor-type attenuator, and the resistance hybrid network that is connected with each resistor-type attenuator output.
4, pectination spectrum according to claim 1 and 2 produces circuit, and it is characterized in that: described frequency changer circuit is a double balanced mixer.
5, pectination spectrum according to claim 3 produces circuit, and it is characterized in that: described frequency changer circuit is a double balanced mixer.
6, pectination spectrum according to claim 5 produces circuit, and it is characterized in that: the quantity in the resistor-type attenuator in frequency divider in the described frequency dividing circuit and the described frequency mixing circuit is consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920159235 CN201414119Y (en) | 2008-12-23 | 2009-06-11 | Comb spectrum generating circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820099178 | 2008-12-23 | ||
| CN200820099178.6 | 2008-12-23 | ||
| CN 200920159235 CN201414119Y (en) | 2008-12-23 | 2009-06-11 | Comb spectrum generating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201414119Y true CN201414119Y (en) | 2010-02-24 |
Family
ID=41715998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920159235 Expired - Lifetime CN201414119Y (en) | 2008-12-23 | 2009-06-11 | Comb spectrum generating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201414119Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183303A (en) * | 2011-02-23 | 2011-09-14 | 上海大学 | Comb spectrum generating system and method based on circulating frequency shift mode |
| CN102244526A (en) * | 2011-06-09 | 2011-11-16 | 中国工程物理研究院电子工程研究所 | All-digital generation method of dense broadband comb spectrum signals |
| CN102938641A (en) * | 2012-11-28 | 2013-02-20 | 北京中讯四方科技股份有限公司 | Comb spectrum generator |
| CN112730932A (en) * | 2020-12-23 | 2021-04-30 | 广州广电计量检测股份有限公司 | Comb spectrum signal generating system |
-
2009
- 2009-06-11 CN CN 200920159235 patent/CN201414119Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183303A (en) * | 2011-02-23 | 2011-09-14 | 上海大学 | Comb spectrum generating system and method based on circulating frequency shift mode |
| CN102183303B (en) * | 2011-02-23 | 2012-07-04 | 上海大学 | Comb spectrum generating system and method based on circulating frequency shift mode |
| CN102244526A (en) * | 2011-06-09 | 2011-11-16 | 中国工程物理研究院电子工程研究所 | All-digital generation method of dense broadband comb spectrum signals |
| CN102244526B (en) * | 2011-06-09 | 2013-09-04 | 中国工程物理研究院电子工程研究所 | All-digital generation method of dense broadband comb spectrum signals |
| CN102938641A (en) * | 2012-11-28 | 2013-02-20 | 北京中讯四方科技股份有限公司 | Comb spectrum generator |
| CN112730932A (en) * | 2020-12-23 | 2021-04-30 | 广州广电计量检测股份有限公司 | Comb spectrum signal generating system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100224 |
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| CX01 | Expiry of patent term |