CN111541449A - Ultra-wideband orthogonal local oscillator signal generating device - Google Patents
Ultra-wideband orthogonal local oscillator signal generating device Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention relates to an ultra-wideband orthogonal local oscillator signal generating device, which comprises a phase-locked loop and a local oscillator signal generator; the local oscillator signal generator is connected with the phase-locked loop and used for carrying out frequency division on an output signal of the phase-locked loop and outputting a required orthogonal local oscillator signal; the local oscillation signal generator comprises a prescaler multiplexed in the phase-locked loop, an N-level signal frequency divider connected with the prescaler and a multi-path selector, wherein the input end of the multi-path selector is respectively connected with the output end of the prescaler and the output end of the N-level signal frequency divider, and the output end of the multi-path selector is the output end of the local oscillation signal generator; n is a positive integer; the frequency range of the output signal of the prescaler is partially overlapped with the frequency range of the output signal of the first stage signal frequency divider, and the frequency ranges of the output signals of the adjacent two stages of signal frequency dividers are partially overlapped. The system has simple structure and can output the ultra-wideband orthogonal local oscillator signal without dead zone.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to an ultra-wideband orthogonal local oscillator signal generating device.
Background
Currently, many wireless communication standards require only narrow band frequencies, such as GSM, bluetooth, and WLAN (802.11). The bandwidth of these wireless communications is less than 1% to 10% of the carrier, which means that a narrow band phase locked loop can meet the local oscillator signal requirements of the transceiver.
However, some other applications require a wideband local oscillator signal, such as test equipment, software defined radio and multi-communication standard chips, etc. Also, these applications typically require continuous frequency coverage and quadrature signals.
The current broadband quadrature local oscillator generation technology can be mainly divided into two types, one is a scheme of mainly utilizing a signal frequency divider to directly divide the frequency of the phase-locked loop output frequency to obtain a required quadrature signal; another is a scheme using both signal dividers and mixers to divide and mix the phase locked loop output frequency signal to obtain the desired quadrature signal.
In the first scheme of mainly using a signal frequency divider to obtain an orthogonal local oscillator signal, as shown in fig. 1, a plurality of signal frequency dividers are respectively connected with a phase-locked loop to divide the frequency of the output of the phase-locked loop in a refined manner, and because of the frequency range of the output signal of the phase-locked loop, a frequency "dead zone" problem generally exists, that is, continuous frequencies cannot be generated, and frequency sections cannot be covered exist; in the second scheme of obtaining the quadrature local oscillator signal by using the signal frequency divider and the frequency mixer, as shown in fig. 2, the output signal of the frequency mixer needs to be further filtered and amplified, and an additional frequency mixer is required, which increases the complexity and time cost of the design and is not favorable for iterative updating of the design.
Disclosure of Invention
The invention aims to provide an ultra wide band orthogonal local oscillator signal generating device which can obtain ultra wide band orthogonal local oscillator signals with continuous frequencies and has a simple system.
In order to achieve the purpose, the invention adopts the technical scheme that:
an ultra-wideband quadrature local oscillator signal generating device, comprising:
the frequency range of an output signal of the phase-locked loop is f 1-f 2;
the local oscillator signal generator is connected with the phase-locked loop and used for carrying out frequency division on an output signal of the phase-locked loop and outputting a required orthogonal local oscillator signal; the local oscillation signal generator comprises a prescaler multiplexed in the phase-locked loop, N stages of signal frequency dividers connected with the prescaler and a multi-path selector, wherein the input end of the multi-path selector is respectively connected with the output end of the prescaler and the output end of the N stages of signal frequency dividers, and the output end of the multi-path selector is the output end of the local oscillation signal generator; n is a positive integer;
when N =1, the frequency range of the output signal of the prescaler partially overlaps with the frequency range of the output signal of the signal divider; when N is more than 1, N stages of signal frequency dividers are cascaded, the frequency range of the output signal of the prescaler is partially overlapped with the frequency range of the output signal of the first stage of signal frequency divider, and the frequency ranges of the output signals of the adjacent two stages of signal frequency dividers are partially overlapped.
The prescaler and the signal frequency dividers at all levels are divide-by-two frequency dividers.
f1≤f2/2。
The prescaler is multiplexed by the phase-locked loop and the local oscillator signal generator.
The phase-locked loop is a fractional N frequency division phase-locked loop.
The prescaler adopts a signal frequency divider with a high-frequency and large-swing structure, and the signal frequency divider adopts a CML current mode logic frequency divider and/or a CMOS voltage mode logic frequency divider.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the system has simple structure and can output the ultra-wideband orthogonal local oscillator signal without dead zone.
Drawings
Fig. 1 is a schematic diagram of a conventional scheme for obtaining quadrature local oscillation signals by mainly using a frequency divider.
Fig. 2 is a schematic diagram of a conventional scheme for obtaining quadrature local oscillator signals by using a frequency divider and a mixer.
Fig. 3 is a schematic structural diagram of an ultra-wideband quadrature local oscillator signal generating device according to the present invention.
FIG. 4 is a graph comparing frequency profiles for signals with and without frequency "dead zones"; (a) f1 is more than f2/2, and a frequency dead zone is formed; (b) f1 is not less than f2/2, and no frequency dead zone exists.
Fig. 5 is a block diagram showing an example of an ultra-wideband quadrature local oscillator signal generating apparatus according to the present invention.
Fig. 6 is a 6GHz frequency signal under the architecture of the ultra-wideband quadrature local oscillator signal generating device of the present invention.
Fig. 7 shows a 12GHz frequency signal under the architecture of the ultra-wideband quadrature local oscillator signal generating device of the present invention.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.
The first embodiment is as follows: as shown in fig. 3, an ultra-wideband quadrature local oscillator signal generating apparatus includes a Phase Locked Loop (PLL) and a local oscillator signal generator (LO).
The frequency range of an output signal of the phase-locked loop is f 1-f 2, and f1 is less than f 2. In this embodiment, the phase-locked loop is a fractional-N phase-locked loop (frac-N PLL).
The local oscillator signal generator is connected with the phase-locked loop and used for carrying out frequency division on output signals of the phase-locked loop and outputting required orthogonal local oscillator signals. The local oscillation signal generator comprises a prescaler, an N-level signal frequency divider and a multiplexer, wherein N is a positive integer. The prescaler is connected with a voltage-controlled oscillator in the phase-locked loop, the N-level signal frequency divider is connected with the prescaler, and the input end of the multi-path selector is respectively connected with the output end of the prescaler and the output end of each level of signal frequency divider. The output end of the multiplexer is the output end of the local oscillation signal generator, and the reconfigurable configurable orthogonal output frequency is realized through the multiplexer. The prescaler is multiplexed by a phase-locked loop and a local oscillator signal generator.
When N =1, i.e. only one stage of signal divider is provided after the prescaler, the frequency range of the output signal of the prescaler partially overlaps with the frequency range of the output signal of the signal divider. The frequency range of the output signal of the prescaler is f 1/2-f 2/2, the frequency range of the output signal of the primary signal frequency divider is f 1/4-f 2/4, if the two frequency ranges are at least partially overlapped, the minimum value of the frequency range of the output signal of the prescaler is required to be less than or equal to the maximum value of the frequency range of the output signal of the primary signal frequency divider, namely f1/2 is more than or equal to f2/4, namely f1 is more than or equal to f 2/2.
When N is more than 1, namely when a plurality of stages of signal frequency dividers are arranged behind the prescaler, the N stages of signal frequency dividers are cascaded, the frequency range of the output signal of the prescaler is partially overlapped with the frequency range of the output signal of the first stage of signal frequency divider, and the frequency range of the output signal of the adjacent two stages (the nth stage and the (N + 1) th stage, wherein N is more than or equal to 1 and less than N) of signal frequency dividers is partially overlapped. It is also required that the minimum value of the frequency range of the output signal of the prescaler or one stage of the signal divider is equal to or less than the maximum value of the frequency range of the output signal of the signal divider of the subsequent stage.
The prescaler and each level of signal frequency divider are divide-by-two frequency dividers. Then for the kth stage frequency divider (k =0, 1, 2, 3 … … N, k =0 for prescaler, k =1, 2, 3 … … N for signal dividers in stages), the frequency range of the output signal is f1/2k+1~f2/2k+1If f1/2 is satisfiedk+1≤f2/2(k+1)+1I.e. f1 ≦ f2/2, overlap of the output frequency ranges of the individual dividers may be achieved.
In this embodiment, the frequency ranges of the output signals of the prescaler and the signal dividers at each stage are respectively: f 1/2-f 2/2, f 1/4-f 2/4, … …, f1/2N~f1/2N，f1/2N+1~f2/2N+1. Namely, the frequency output range of the kth frequency divider is:
f1/2k+1~f2/2k+1，k = 0，1，2，3……N
where k =0 represents the output of the prescaler.
Fig. 4 shows a comparison of frequency profiles with and without frequency "dead zones".
The frequency in fig. 3 is exemplified by the frequency coverage under critical conditions, i.e. the output frequency coverage at f1 = f2/2, f2= f. At this point, there is just no frequency "dead zone" and there is no multiple frequency overlap (of course, certain margins are actually needed based on reliability considerations).
Fig. 5 shows an example of a specific implementation. This example uses a PLL output frequency range of 12GHz-24GHz with a cascaded divider stage number of 8 after the prescaler, so the output frequency range is 23.4375MHz-12GHz with no frequency "dead space". In addition, the frequency divider structure can be flexibly selected according to the difference of the working frequency and the working range of the frequency divider, for example, the prescaler adopts a signal frequency divider with a high-frequency and large-swing structure, and each level of signal frequency divider adopts a CML current mode logic frequency divider and/or a CMOS voltage mode logic frequency divider. In this example, the prescaler has a high frequency and large swing structure, the first three cascaded frequency dividers have a CML current mode logic frequency divider, and then have a CMOS voltage mode logic frequency divider, and finally are combined through MUX.
Fig. 6 shows a signal waveform at an output frequency of 6GHz based on the present design LO, with an output amplitude of 1.2V and a quadrature IQ phase difference of less than 3 °. Fig. 7 shows the LO based on the present design, with an output amplitude of 916mV, and a signal waveform with an output frequency of 12G.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. An ultra wide band quadrature local oscillator signal generating device, characterized in that: the ultra-wideband orthogonal local oscillator signal generating device comprises:
the frequency range of an output signal of the phase-locked loop is f 1-f 2;
the local oscillator signal generator is connected with the phase-locked loop and used for carrying out frequency division on an output signal of the phase-locked loop and outputting a required orthogonal local oscillator signal; the local oscillation signal generator comprises a prescaler multiplexed in the phase-locked loop, N stages of signal frequency dividers connected with the prescaler and a multi-path selector, wherein the input end of the multi-path selector is respectively connected with the output end of the prescaler and the output end of the N stages of signal frequency dividers, and the output end of the multi-path selector is the output end of the local oscillation signal generator; n is a positive integer;
when N =1, the frequency range of the output signal of the prescaler partially overlaps with the frequency range of the output signal of the signal divider; when N is more than 1, N stages of signal frequency dividers are cascaded, the frequency range of the output signal of the prescaler is partially overlapped with the frequency range of the output signal of the first stage of signal frequency divider, and the frequency ranges of the output signals of the adjacent two stages of signal frequency dividers are partially overlapped.
2. The ultra-wideband quadrature local oscillator signal generating device of claim 1, wherein: the prescaler and the signal frequency dividers at all levels are divide-by-two frequency dividers.
3. The ultra-wideband quadrature local oscillator signal generating device of claim 2, wherein: f1 is less than or equal to f 2/2.
4. An ultra-wideband quadrature local oscillator signal generating apparatus according to claim 1, 2 or 3, wherein: the phase-locked loop is a fractional N frequency division phase-locked loop.
5. An ultra-wideband quadrature local oscillator signal generating apparatus according to claim 1, 2 or 3, wherein: the prescaler adopts a signal frequency divider with a high-frequency and large-swing structure, and the signal frequency divider adopts a CML current mode logic frequency divider and/or a CMOS voltage mode logic frequency divider.
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