Ultra-wideband high-performance frequency source

Abstract

The utility model relates to an ultra-wideband high-performance frequency source, which comprises a first phase-locked loop, the input end of the first phase-locked loop receives reference signals, the output end of the first phase-locked loop is connected with the input end of a second phase-locked loop, and the output end of the second phase-locked loop is connected with the input end of a first numerical control attenuator. The output end of the first numerical control attenuator is connected with the input end of the first equalizer, the output end of the first equalizer is connected with the input end of the second numerical control attenuator, the output end of the second numerical control attenuator is connected with the input end of the first radio frequency switch, and the output end of the first radio frequency switch is connected with the input end of the second radio frequency switch. The output end of the second radio frequency switch is connected with the input end of a third numerical control attenuator, the output end of the third numerical control attenuator is connected with the input end of a second equalizer, the output end of the second equalizer is connected with the input end of a fifth amplifier, and the output end of the fifth amplifier outputs signals. According to the utility model, signal output with ultra wide band, small step, low stray and flat level, which cannot be simultaneously satisfied by the existing frequency source, is satisfied, and the performance of an application system is improved.

Description

Technical Field

[0001] The utility model relates to an ultra-wideband high-performance frequency source, belonging to the field of signal sources. Background Art

[0002] The frequency source plays an important role in modern electronic communication systems. It is known as the heart of the electronic system. The performance of the electronic system depends largely on the frequency source.

[0003] In microwave communication component and signal testing, the existing common frequency sources are unable to meet the above requirements simultaneously, due to the limitations of output signal bandwidth, output signal level flatness within ultra-wideband, output signal small step, and low spurious. Utility Model Content

[0004] The purpose of the utility model is to design an ultra-wideband high-performance frequency source, which can simultaneously meet the requirements of ultra-wideband, small step, low spurious, and flat-level signal output that existing frequency sources cannot simultaneously meet, thereby improving the performance of the application system.

[0005] The technical solution of this utility model:

[0006] An ultra-wideband high-performance frequency source comprises a phase-locked loop 1, wherein an input end of the phase-locked loop 1 receives a reference signal, an output end of the phase-locked loop 1 is connected to an input end of a phase-locked loop 2, an output end of the phase-locked loop 2 is connected to an input end of a digitally controlled attenuator 1, an output end of the digitally controlled attenuator 1 is connected to an input end of an equalizer 1, an output end of the equalizer 1 is connected to an input end of the digitally controlled attenuator 2, an output end of the digitally controlled attenuator 2 is connected to an input end of a radio frequency switch 1, an output end of the radio frequency switch 1 is connected to an input end of the radio frequency switch 2, an output end of the radio frequency switch 2 is connected to an input end of a digitally controlled attenuator 3, an output end of the digitally controlled attenuator 3 is connected to an input end of an equalizer 2, an output end of the equalizer 2 is connected to an input end of an amplifier 5, and an output end of the amplifier 5 outputs a signal.

[0007] Preferably, a frequency-band filtering structure is arranged between the output end of RF switch one and the input end of RF switch two, and the frequency-band filtering structure includes an amplifier and a filter. The output end of RF switch one is connected to the input end of the amplifier, the output end of the amplifier is connected to the input end of the filter, and the output end of the filter is connected to the input end of RF switch two.

[0008] Preferably, the frequency band filtering structure is composed of four groups, which are arranged in parallel. The first group of frequency band filtering structures includes amplifier one and filter one, the second group of frequency band filtering structures includes amplifier two and filter two, the third group of frequency band filtering structures includes amplifier three and filter three, and the fourth group of frequency band filtering structures includes amplifier four and filter four.

[0009] Preferably, the structures of amplifier 1, amplifier 2, amplifier 3, amplifier 4 and amplifier 5 are the same; the structures of filter 1, filter 2, filter 3 and filter 4 are the same; the structures of digital controlled attenuator 1, digital controlled attenuator 2 and digital controlled attenuator 3 are the same; the structures of equalizer 1 and equalizer 2 are the same; and the structures of RF switch 1 and RF switch 2 are the same.

[0010] Preferably, phase-locked loop one includes a phase detector, a loop filter and a voltage-controlled oscillator, the input end of the phase detector receives a reference signal, the output end of the phase detector is connected to the input end of the loop filter, the output end of the loop filter is connected to the input end of the voltage-controlled oscillator, and the input end of the voltage-controlled oscillator is connected to the input end of phase-locked loop two; the structures of phase-locked loop two and phase-locked loop three are the same.

[0011] Beneficial effects of the utility model:

[0012] The utility model uses phase-locked loop 1 to perform phase-locked processing on a reference signal to generate a signal whose frequency can be changed in small steps and is given to phase-locked loop 2 as a reference signal to achieve small steps of the overall output signal. The signal frequency output by phase-locked loop 2 is the frequency of the overall output. Under ultra-wideband conditions, the signal level value will become uneven. After calibration control in different frequency bands by digital controlled attenuator 1, equalizer 1, digital controlled attenuator 2, digital controlled attenuator 3 and equalizer 2, the level value of the ultra-wideband signal will become very flat. The signal passes through radio frequency switch 1, amplifier 1, filter 1, amplifier 2, filter 2, amplifier 3, filter 3, amplifier 4, filter 4 and radio frequency switch 2, and is filtered by frequency bands, which makes the spurious index of the output signal very excellent.

[0013] The utility model can simultaneously meet the requirements of ultra-wideband, small step, low spurious, and flat-level signal output that existing frequency sources cannot simultaneously meet, thereby improving the performance of the application system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a principle block diagram of the utility model.

[0015] Figure 2 This is a block diagram of the composition of the first phase-locked loop of the utility model. DETAILED DESCRIPTION

[0016] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0017] like Figure 1 and Figure 2As shown, an ultra-wideband high-performance frequency source includes a phase-locked loop 1, the input end of the phase-locked loop 1 receives a reference signal, the output end of the phase-locked loop 1 is connected to the input end of the phase-locked loop 2, the output end of the phase-locked loop 2 is connected to the input end of a digitally controlled attenuator 1, the output end of the digitally controlled attenuator 1 is connected to the input end of an equalizer 1, the output end of the equalizer 1 is connected to the input end of the digitally controlled attenuator 2, the output end of the digitally controlled attenuator 2 is connected to the input end of a radio frequency switch 1, the output end of the radio frequency switch 1 is connected to the input end of the radio frequency switch 2, a frequency division filtering structure is arranged between the output end of the radio frequency switch 1 and the input end of the radio frequency switch 2, the frequency division filtering structure includes an amplifier and a filter, the output end of the radio frequency switch 1 is connected to the input end of the amplifier, the output end of the amplifier is connected to the input end of the filter, and the output end of the filter is connected to the input end of the radio frequency switch 2. The frequency division filtering structure is divided into four groups, which are arranged in parallel. The first group of frequency division filtering structures includes an amplifier 1 and a filter 1, the second group of frequency division filtering structures includes an amplifier 2 and a filter 2, the third group of frequency division filtering structures includes an amplifier 3 and a filter 3, and the fourth group of frequency division filtering structures includes an amplifier 4 and a filter 4. The output end of the RF switch 2 is connected to the input end of the digital controlled attenuator 3, the output end of the digital controlled attenuator 3 is connected to the input end of the equalizer 2, the output end of the equalizer 2 is connected to the input end of the amplifier 5, and the output end of the amplifier 5 outputs a signal.

[0018] The structures of amplifier 1, amplifier 2, amplifier 3, amplifier 4 and amplifier 5 are the same; the structures of filter 1, filter 2, filter 3 and filter 4 are the same; the structures of digital controlled attenuator 1, digital controlled attenuator 2 and digital controlled attenuator 3 are the same; the structures of equalizer 1 and equalizer 2 are the same; and the structures of radio frequency switch 1 and radio frequency switch 2 are the same.

[0019] Phase-locked loop 1 includes a phase detector, a loop filter and a voltage-controlled oscillator, the input end of the phase detector receives a reference signal, the output end of the phase detector is connected to the input end of the loop filter, the output end of the loop filter is connected to the input end of the voltage-controlled oscillator, and the input end of the voltage-controlled oscillator is connected to the input end of phase-locked loop 2; the structures of phase-locked loop 2 and phase-locked loop 3 are the same.

[0020] The working process of this utility model:

[0021] The utility model uses a phase-locked loop 1 to perform phase-locked processing on a reference signal to generate a signal with a frequency that can be changed in small steps and is given to a phase-locked loop 2 as a reference signal (by setting the frequency of the phase-locked loop 1 to change in small steps) to achieve a small step of the overall output signal, with a minimum of 0.1Hz. The signal frequency output by the phase-locked loop 2 is the frequency of the overall output. Under the condition that the ultra-wideband frequency range is 50MHz-20000MHz, the signal level value will become uneven. According to the actual measurement, the digital control attenuator 1, the digital control attenuator 2, and the digital control attenuator 3 are monitored and controlled. And the calibration control in different frequency bands using the characteristics of the equalizer 1 and the equalizer 2 will make the level value of the ultra-wideband signal very flat. The characteristics of the equalizer are that the attenuation value is larger at a lower frequency and smaller at a higher frequency. The actual RF signal output level has a larger output signal at a lower frequency and a smaller output signal at a higher frequency. In this way, the overall output signal level will be maintained in a relatively flat level range. After calibration and compensation, the actual measurement result of the ultra-wideband signal level is 5±1.5dBm, and the flatness is about 3dB. The signal passes through RF switch 1, amplifier 1, filter 1, amplifier 2, filter 2, amplifier 3, filter 3, amplifier 4, filter 4 and RF switch 2, and is filtered through frequency bands, which will make the spurious index of the output signal very good. The actual measured result is -65dBc.

[0022] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An ultra-wideband high-performance frequency source, characterized in that: It includes a phase-locked loop 1, wherein the input end of the phase-locked loop 1 receives a reference signal, the output end of the phase-locked loop 1 is connected to the input end of the phase-locked loop 2, the output end of the phase-locked loop 2 is connected to the input end of a digitally controlled attenuator 1, the output end of the digitally controlled attenuator 1 is connected to the input end of an equalizer 1, the output end of the equalizer 1 is connected to the input end of the digitally controlled attenuator 2, the output end of the digitally controlled attenuator 2 is connected to the input end of a radio frequency switch 1, the output end of the radio frequency switch 1 is connected to the input end of the radio frequency switch 2, the output end of the radio frequency switch 2 is connected to the input end of a digitally controlled attenuator 3, the output end of the digitally controlled attenuator 3 is connected to the input end of the equalizer 2, the output end of the equalizer 2 is connected to the input end of an amplifier 5, and the output end of the amplifier 5 outputs a signal.

2. The ultra-wideband high-performance frequency source according to claim 1, characterized in that: A frequency-band filtering structure is arranged between the output end of RF switch one and the input end of RF switch two. The frequency-band filtering structure includes an amplifier and a filter. The output end of RF switch one is connected to the input end of the amplifier, the output end of the amplifier is connected to the input end of the filter, and the output end of the filter is connected to the input end of RF switch two.

3. The ultra-wideband high-performance frequency source according to claim 2, characterized in that: The frequency band filtering structure is divided into four groups and arranged in parallel. The first group of frequency band filtering structures includes amplifier one and filter one, the second group of frequency band filtering structures includes amplifier two and filter two, the third group of frequency band filtering structures includes amplifier three and filter three, and the fourth group of frequency band filtering structures includes amplifier four and filter four.

4. The ultra-wideband high-performance frequency source according to claim 3, characterized in that: The structures of amplifier 1, amplifier 2, amplifier 3, amplifier 4 and amplifier 5 are the same; the structures of filter 1, filter 2, filter 3 and filter 4 are the same; the structures of digital controlled attenuator 1, digital controlled attenuator 2 and digital controlled attenuator 3 are the same; the structures of equalizer 1 and equalizer 2 are the same; and the structures of radio frequency switch 1 and radio frequency switch 2 are the same.

5. The ultra-wideband high-performance frequency source according to claim 4, characterized in that: Phase-locked loop 1 includes a phase detector, a loop filter and a voltage-controlled oscillator, the input end of the phase detector receives a reference signal, the output end of the phase detector is connected to the input end of the loop filter, the output end of the loop filter is connected to the input end of the voltage-controlled oscillator, and the input end of the voltage-controlled oscillator is connected to the input end of phase-locked loop 2; the structures of phase-locked loop 2 and phase-locked loop 3 are the same.

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