JP2002246845A - Oscillator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oscillator which is formed of an oscillation source constituted of a PLL frequency synthesizer and a mixer and a frequency-divider, capable of being adaptive to a wide band frequency range by using one oscillation source. SOLUTION: In the oscillator formed of the oscillation source 201 constituted of the PLL frequency synthesizer and the mixer 202 and the frequency-divider 203, the output of the oscillation source 201 is obtained as one input of the mixer 202, and the output of the mixer 202 is obtained as the input of the frequency-divider 203, and the output of the frequency-divider 203 is fed back to the other input of the mixer 202. Then, output signals are respectively extracted from the oscillation source 201, the mixer 202, and the frequency- divider 203, thus it is possible to realize the oscillator adaptive to a wide band frequency range by using only one oscillation source 201.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillator applied to a radio section of various high-frequency radio devices, communication devices, measuring instruments and the like.

[0002]

2. Description of the Related Art At present, public communications such as mobile phones and PHSs,
Various wireless systems, such as satellite and terrestrial broadcasting, and ITS such as ETC, are operated. Since the frequency bands, communication systems, modulation systems, and transmission speeds used for these systems are different, to enjoy each service,
It is necessary to own a radio corresponding to each service. In recent years, for example, Japanese Patent Application No.
The concept of a software radio as described in JP-A-8-245039 has been proposed.

[0005] FIG. 5 shows a basic configuration of a conventional software radio receiver corresponding to three radio systems. FIG.
, 401 is a transmitter of the wireless system 1, 402 is a receiver, 403 is an oscillator, 404 is a switch for switching between a transmitter and a receiver, 405 is an antenna, 406 is a transmitter 401, a receiver 402, an oscillator 403, and 406 of the wireless system 1. The wireless section of the wireless system 1 constituted by the circuit of the switch 404, 411 is a transmitter of the wireless system 2, 412 is a receiver, 413 is an oscillator, 414 is a switch for switching a transceiver, 415 is an antenna, 416 is a wireless system 2
411, a receiver 412, an oscillator 413, and a switch 414. The wireless unit of the wireless system 1 includes a transmitter 421, a transmitter 422, a receiver 423, an oscillator 423, and a transceiver 424. 425 is an antenna, 426 is a wireless unit of the wireless system 1 composed of a circuit of the transmitter 421, the receiver 422, the oscillator 423, and the switch 424 of the wireless system 3, and 430 is a signal processing unit.

[0004] The high frequency signals input from the antennas 405, 415, 425 are transmitted to the radio units 406, 416, 42
In 6, the signal is down-converted to the IF frequency, and the signal processing unit 430 performs AD conversion, sampling, demodulation processing, and error correction processing, and decodes data, audio, and other signals. The signal processing unit 430 is configured by software, and a software wireless device realizes each system having a different communication method, modulation method, and transmission speed with one wireless device.

[0005]

However, the frequency band used in each of the above radio systems is from VHF band to UHF band.
Band, but it is difficult to realize a frequency selection element that satisfies desired characteristics in all bands of the radio section, especially an oscillator that obtains a wide-band oscillation output. Department was required.

[0006] The present invention solves the above-mentioned problems, and provides a PL
An oscillator formed of an L frequency synthesizer, an oscillator formed of a mixer and a frequency divider, wherein the oscillation source output is one input of the mixer, and the output of the mixer is an input of the frequency divider, An oscillator configured to feed back an output to the other input of the mixer and extracting a signal from each of the oscillation source, the mixer, and the output of the frequency divider to the outside, using only one oscillation source and an oscillator corresponding to a wide frequency range. The purpose is to realize.

[0007]

In order to solve this problem, the present invention combines a mixer and a frequency divider with an oscillating source to generate not only a source signal but also a sum and a difference component with a divided frequency. This is a configuration to make it.

Thus, an oscillator having a wide-band oscillation output from the VHF band to the UHF band can be realized without increasing the number of oscillation sources.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to a first aspect of the present invention is directed to an oscillator formed of a PLL frequency synthesizer, a mixer and a frequency divider, wherein the output of the oscillation source is one of the mixers. And the output of the mixer is used as the input of the frequency divider, and the output is fed back to the other input of the mixer. A signal is taken out from each of the oscillation source, the mixer, and the frequency divider output. Thus, the output frequency range of the oscillator is expanded.

According to this configuration, the output frequency range of the oscillator can be expanded without increasing the number of oscillation sources.

According to a second aspect of the present invention, a PLL
In an oscillator formed by a plurality of frequency dividers and switches having different frequency division numbers provided in parallel with an oscillation source configured by a frequency synthesizer and a mixer, the output of the oscillation source is set as one input of the mixer, and An output is used as an input to the frequency divider, and an output is selectively fed back to the other input of the mixer via a switch based on an external control signal. By extracting a signal to the outside, the output frequency range of the oscillator is expanded.

According to this structure, the oscillation frequency can be further increased as compared with the structure of the first aspect.

According to a third aspect of the present invention, a PLL is provided.
In an oscillator formed by a plurality of frequency dividers and switches connected in series and multiple stages with an oscillation source constituted by a frequency synthesizer and a mixer, the oscillation source output is used as one input of the mixer, and the output of the mixer is divided by the A first input stage of the frequency divider, and selectively output the output of each of the frequency dividers to the other input of the mixer via a switch based on an external control signal. By extracting a signal from each output to the outside, the output frequency range of the oscillator is expanded.

According to this configuration, the oscillation frequency can be further expanded as compared with the second aspect. According to a fourth aspect of the present invention, in the oscillator according to any one of the first to third aspects, any one of the output signals from each terminal is selected via a switch and supplied to the outside as an output of the oscillator. It was done.

According to this configuration, an output signal from each terminal is selected via a switch in accordance with a request of the system,
This has the function of supplying a desired oscillation output to the outside.

According to a fifth aspect of the present invention, there is provided a radio circuit using the oscillator according to any one of the first to fourth aspects, which has an effect of realizing a small and high-performance radio circuit. .

According to a sixth aspect of the present invention, there is provided a wireless device using the wireless circuit according to the fifth aspect, which has an effect of realizing a small and high-performance wireless device.

According to a seventh aspect of the present invention, there is provided a wireless system using the wireless device according to the sixth aspect, which has an effect of realizing a small and high-performance wireless system.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

(Embodiment 1) FIG. 1 shows an overall configuration of a software defined radio to which an oscillator according to the present invention is applied.
In FIG. 1, components denoted by reference numerals 411 to 415 and 430 are the same as those in FIG. Reference numeral 101 denotes a broadband oscillator, which can support a system in a plurality of frequency bands with only one radio unit, so that the software radio can be simplified.

FIG. 2 shows a configuration diagram in the first embodiment for realizing the oscillator 101. In FIG. 2, 201 is P
An oscillation source constituted by an LL frequency synthesizer; 202, a mixer; 203, a frequency divider having a frequency division ratio of 3;
Is a signal output terminal.

[0022] When the input from the oscillation source 201 a signal of a frequency f ₀ to the mixer 202, the circuit of Figure 2 relationships to hold, from the terminal 205 of the frequency of f ₂ = 3f _0/2 (Equation 1) A signal is obtained. Accordingly, f ₃ = f ₀ /
A signal having a frequency of 2 is obtained.

[0023]

(Equation 1)

Here, f ₀ = 1.0-1.5 G at the oscillation source 201
When a frequency of Hz is generated, f ₁ = 1.0
To 1.5 GHz signal from the terminal 205, f ₂ = 1.5 to _2.5 .
A signal of 25 GHz is supplied from the terminal 206 to f ₃ = 0.5 to 0.75.
A GHz signal can be obtained, and the frequency range can be expanded without increasing the number of oscillation sources. FIG. 2 shows an example in which the frequency division ratio of the frequency divider is 3, but it goes without saying that the frequency division ratio is not limited.

(Embodiment 2) FIG. 3 shows a configuration diagram of an oscillator according to Embodiment 2. In FIG. 3, 201, 2
The components numbered 02, 204 to 206 are the same as those in FIG. Reference numerals 207 to 209 denote frequency dividers connected in parallel with different frequency division ratios, 210 denotes a switch for selecting the output of the frequency divider, and 211 denotes an external control signal for controlling the switch 210.

In response to the external control signal 211, the frequency divider 208
The operation when is selected is the same as in the first embodiment, and a description thereof will be omitted. When the frequency divider 207 is selected by the external control signal 211, the frequency
When a signal of f ₀ as an input to the mixer 202, for the circuit of Figure 3 which satisfies the relationship of equation (2), from the terminal 205 f ₂ =
Frequency signals of 2f ₀ is obtained. Accordingly, the terminal 20
From 6, a signal having a frequency of f ₃ = f ₀ is obtained.

[0027]

(Equation 2)

The frequency divider 209 is controlled by an external control signal 211.
If but is selected, when the input from the oscillation source 201 a signal of a frequency f ₀ to the mixer 202, the circuit of FIG. 3 (Equation 3)
Because the relationship is established, a signal of a frequency of f ₂ = 4f _0/3 is obtained from the terminal 205. Accordingly, a signal having a frequency of f ₃ = f _0/3 is obtained from the terminal 206.

[0029]

(Equation 3)

Here, f ₀ = 1.0-1.5G at the oscillation source 201
When a frequency of Hz is generated, f ₁ = 1.0
1.5 GHz signal from terminal 205 to 2.0-3.0 G
Hz, 1.5 to 2.25 GHz, 1.33 to 2.0 GHz, and signals from the terminal 206 are 1.0 to 1.5 GHz, 0.5 to 0.5 GHz.
A signal of any one of 0.75 GHz and 0.33 to 0.5 GHz is obtained.

As described above, when this method is used, 0.33 except for 0.75 to 1.0 GHz is used without increasing the number of oscillation sources.
The whole band of up to 2.68 GHz can be covered, and the frequency range can be expanded as compared with the first embodiment.

FIG. 3 shows an example in which there are three frequency dividers and the frequency division ratios are 2, 3, and 4. However, it goes without saying that the number of frequency dividers and the frequency division ratio are not limited. No.

(Third Embodiment) FIG. 4 shows a configuration diagram of an oscillator according to a third embodiment. In FIG.
The components numbered 02, 204, 205, and 211 are the same as those in FIG. 212-214
Is a frequency divider connected in series, and 215 to 217 are signal output terminals.

In response to the external control signal 211, the frequency divider 212
The operation when the output from the frequency divider 213 is selected is the same as that of the expression 2, and the operation when the output from the frequency divider 213 is selected by the external control signal 211 is the same as that of the expression 3, and the description is omitted. When the output from the frequency divider 214 is selected by the external control signal 211, and the signal of the frequency f ₀ is input to the mixer 202 from the oscillation source 201, the circuit of FIG. F ₂ = 8f ₀ /
A signal having a frequency of 7 is obtained.

[0035]

(Equation 4)

Here, f ₀ = 1.0 to 1.5 G at the oscillation source 201
When a frequency of Hz is generated, f ₁ = 1.0
1.5 GHz signal from terminal 205 to 2.0-3.0 G
Hz, 1.33 to 2.0 GHz, or 1.14 to 1.71 GHz signals are output from the terminal 215 to 1.0 to 1.5 GHz or 0.67.
Any signal of ~ 1.0GHz, 0.57 ~ 0.85GHz,
0.5 to 0.75 GHz, 0.33 to 0.5 from terminal 216
GHz, any signal of 0.28 to 0.42 GHz
From 0.25 to 0.37 GHz, 0.17 to 0.25 GH
z, any signal of 0.14 to 0.21 GHz is obtained.

As described above, by using this method, the entire band of 0.14 to 3.0 GHz can be covered without increasing the number of oscillation sources, and the frequency range can be expanded more than in the second embodiment. Can be achieved.

FIG. 4 shows an example in which there are three frequency dividers and the frequency division ratio is 2, but the number of frequency dividers is not limited, and the frequency division ratio may be arbitrarily set. Needless to say.

[0039]

As described above, according to the present invention, in an oscillator formed by a PLL frequency synthesizer, a mixer and a frequency divider, an output of the oscillation source is used as one input of the mixer, The output is used as the input of the frequency divider, and the output is fed back to the other input of the mixer.
By extracting a signal from each of the oscillation source, the mixer, and the output of the frequency divider to the outside, an oscillator corresponding to a wide frequency range can be realized with only one oscillation source.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a software defined radio to which an oscillator according to the present invention is applied.

FIG. 2 is a block diagram showing a configuration of an oscillator according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of an oscillator according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of an oscillator according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional software defined radio.

[Explanation of symbols]

101, 201 oscillation source 202 mixer 203, 207, 208, 209, 212, 213, 2
14 Divider 204, 205, 206, 215, 216, 217 Output terminal 210, 404, 414, 424 Switch 211 External control signal 401, 411, 421 Transmitter 402, 412, 422 Receiver 403, 413, 423 Oscillator 405 , 415, 425 Antennas 406, 416, 426 Radio 430 Signal processing unit

Claims (7)

[Claims] 1. An oscillator formed of a PLL frequency synthesizer, an oscillator formed of a mixer and a frequency divider,
The oscillation source output is used as one input of the mixer, the output of the mixer is used as the input of the frequency divider, and the output of the divided cycle is fed back to the other input of the mixer. An oscillator that expands the output frequency range of the oscillator by extracting a signal from each of the divider outputs to the outside. 2. An oscillator comprising an oscillation source constituted by a PLL frequency synthesizer, a plurality of frequency dividers having different division numbers and switches provided in parallel with a mixer, wherein the oscillation source output is supplied to one of the mixers. As an input, the output of the mixer as an input of the frequency divider, and the output of the divided cycle is selectively fed back to the other input of the mixer via a switch based on an external control signal, An oscillator characterized in that an output frequency range of the oscillator is expanded by extracting a signal from each of an oscillation source, a mixer, and a switch output to the outside. 3. An oscillator formed by a plurality of frequency dividers and switches connected in series and multiple stages to an oscillation source constituted by a PLL frequency synthesizer and a mixer, wherein the oscillation source output is one input of the mixer, The output of the mixer is input to the first stage of the frequency divider, and the output of each frequency divider is selectively fed back to the other input of the mixer via a switch based on a control signal from the outside. ,
An oscillator characterized in that the output frequency range of the oscillator is expanded by extracting a signal from each of the mixer and the divider output to the outside. 4. The oscillator according to claim 1, wherein one of output signals from each terminal is selected via a switch and supplied to the outside as an output of the oscillator. 5. A wireless circuit using the oscillator according to claim 1. 6. A wireless device using the wireless circuit according to claim 5. 7. A wireless system using the wireless device according to claim 6.