Circuit for improving output amplitude consistency of broadband ping-pong local oscillator

Abstract

The utility model relates to the field of microwave communication, and specifically relates to a circuit for improving broadband ping-pong local oscillator output amplitude consistency. Comprising a first attenuator, a programmable frequency divider, a first filter, a first amplifier, a second attenuator, a second filter, a second amplifier and a third filter which are sequentially connected end to end, the input end of the first attenuator is connected with the output end of the ping-pong local oscillator; and the programmable frequency divider is configured to be in a 1 frequency division mode and is used for carrying out amplitude stabilization processing on the signal output by the first attenuator. According to the invention, the consistency and stability of the output amplitude are significantly improved. The circuit design is simplified, the debugging difficulty is reduced, and the overall performance of the system is improved, so that the system is more suitable for the requirements of a modern microwave communication system.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of microwave communication, concretely relates to a circuit that improves the consistency of the output amplitude of wideband ping-pong local oscillator. BACKGROUND

[0002] In the field of microwave communication, the output amplitude consistency of ping-pong local oscillator is one of the key factors affecting system performance. When the traditional ping-pong local oscillator circuit is used in frequency switching and wide frequency band, the output amplitude is easily affected by factors such as wiring and device consistency, making it difficult to ensure the consistency of the output amplitude. With the continuous development of microwave electronic technology, the technical indicators of the output amplitude and flatness of ping-pong local oscillator are becoming more and more demanding. The pros and cons of these indicators directly affect the stability, consistency of radio systems such as radar, communication and telemetry, as well as the detection ability of moving targets, communication error rate and selectivity. In the prior art, although there are related technologies trying to solve the problem of the output amplitude consistency of ping-pong local oscillator, for example, the utility model patent with the patent number CN217824930U discloses a wideband phase-locked loop circuit and a phase-locked loop module, the technical solution mainly aims at the design of the phase-locked loop circuit, the core of which is to improve the stability and bandwidth of frequency output by optimizing the feedback loop of the phase-locked loop, which does not directly solve the problem of the output amplitude consistency of ping-pong local oscillator.

[0003] Therefore, how to improve the consistency of the output amplitude of wideband ping-pong local oscillator has become a technical problem to be solved in this field. UTILITY MODEL CONTENT

[0004] The utility model aims to provide a circuit that improves the consistency of the output amplitude of wideband ping-pong local oscillator, to solve the problem of how to improve the consistency of the output amplitude of wideband ping-pong local oscillator.

[0005] To achieve the above-mentioned purpose, the following technical solutions are adopted.

[0006] A circuit that improves the consistency of the output amplitude of wideband ping-pong local oscillator, comprising a first attenuator, a programmable frequency divider, a first filter, a first amplifier, a second attenuator, a second filter, a second amplifier and a third filter connected in sequence.

[0007] The input end of the first attenuator is connected to the output end of the ping-pong local oscillator.

[0008] The programmable frequency divider is configured in 1 frequency division mode and is used for amplitude stabilization processing of the signal output by the first attenuator.

[0009] Optionally, the first attenuator and the second attenuator are π-type fixed attenuators with an impedance of 50Ω.

[0010] Optionally, the input amplitude range of the programmable frequency divider is -20dBm to 10dBm, the output amplitude flatness is ≤±1dB, and the phase noise is ≤-153dBc / Hz@100kHz.

[0011] Optionally, the first filter and the second filter are band-pass filters, used for suppressing stray outside the frequency band, the first filter and the second filter have a center insertion loss of ≤2dB, an in-band flatness of ≤±0.5dB, and a suppression degree of stray outside the frequency band of ≥40dBc.

[0012] Optionally, the third filter is a low-pass filter, used for harmonic suppression of the output frequency, the third filter has a harmonic suppression degree of ≥40dBc and an insertion loss of ≤2dB.

[0013] Optionally, the first amplifier is a 50Ω impedance amplifier, having an amplification of ≥14dB and an in-band gain flatness of ≤±0.5dB.

[0014] The output amplitude of the first amplifier is lower than its P-1dB by ≥6dBm.

[0015] Optionally, the second amplifier is a 50Ω impedance amplifier, having an amplification of ≥14dB and an in-band gain flatness of ≤±0.5dB.

[0016] The P-1dB of the second amplifier is higher than the final output requirement by ≥2dB.

[0017] Optionally, the temperature compensation module and the dynamic adjustment unit are further included.

[0018] The temperature compensation module is integrated at the control end of the first attenuator and the second attenuator, and is used for adjusting the attenuation according to the change of the ambient temperature.

[0019] The dynamic adjustment unit is connected to the output end of the programmable frequency divider, and is used for monitoring the amplitude fluctuation of the signal, and triggering the frequency division ratio of the programmable frequency divider to be adaptively adjusted to a 1.05-0.95 frequency division mode when the amplitude deviation exceeds ±0.5dB, so as to compensate the amplitude deviation.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model effectively solves the problem of poor output amplitude consistency of the wideband ping-pong local oscillator in the prior art. The first attenuator, the programmable frequency divider, the filter and the amplifier connected in sequence realize stable amplitude processing and optimized output of the input signal, and significantly improve the consistency and stability of the output amplitude. Not only is the circuit design simplified, the debugging difficulty is reduced, but also the overall performance of the system is improved, so that it is more suitable for the needs of modern microwave communication systems.

[0022] The π type fixed attenuator is adopted, the matching performance of the circuit is enhanced, the stability and consistency of signal transmission are ensured, the performance of the programmable frequency divider is limited, the input amplitude range and output amplitude flatness are further optimized, and the requirement for the output amplitude of the ping-pong local oscillator is reduced. Through the optimization of the design of the filter, the stray and the harmonic of the output frequency outside the frequency band are effectively suppressed, and the signal quality is improved. The performance of the amplifier is limited to ensure that the stray, the harmonic and the flatness are not deteriorated in the signal amplification process. The temperature compensation module is introduced to further improve the environmental adaptability of the circuit, so that the circuit can maintain stable output amplitude in complex environment. The combination of these characteristics not only improves the stability and consistency of the circuit, but also improves the overall performance of the system, so that it is more suitable for the needs of modern microwave communication systems. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a schematic diagram of the overall structure of an embodiment of the circuit for improving the output amplitude consistency of a wideband ping-pong local oscillator according to the present application. DETAILED DESCRIPTION

[0024] The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0025] The following detailed description is exemplary description and is intended to provide further detailed description of the present application. Unless otherwise specified, all technical terms used in the present application have the same meaning as understood by those skilled in the art. The terms used in the present application are only for the purpose of describing the specific embodiments and are not intended to limit the exemplary embodiments according to the present application.

[0026] As shown in Figure 1 The circuit of the present application comprises a first attenuator, a programmable frequency divider, a first filter, a first amplifier, a second attenuator, a second filter, a second amplifier and a third filter connected in sequence. The output signal of the ping-pong local oscillator is first adjusted in amplitude by the first attenuator to meet the input amplitude requirement of the subsequent programmable frequency divider. The first attenuator adopts a π type fixed attenuator with an impedance of 50Ω, which can effectively reduce signal reflection and loss, and ensure the stability and consistency of the signal in the transmission process. In the design, the parameter calculation of the π type attenuator needs to meet the impedance matching requirement, for example, in a 50Ω system, the specific resistance value can be calculated according to the required attenuation.

[0027] The adjusted signal enters a programmable frequency divider. The programmable frequency divider is configured in a 1 division mode, with an input amplitude range of -20dBm to 10dBm, an output amplitude flatness controlled at ≤±1dB, and a phase noise better than -153dBc / Hz@100kHz. This high-performance frequency divider can maintain stable output amplitude within a wide input amplitude range, effectively solving the problem of ping-pong local oscillator output amplitude fluctuation.

[0028] The signal processed by the programmable frequency divider then enters the first filter. The first filter uses a bandpass filter, which mainly functions to suppress stray signals outside the frequency band to optimize the spectral characteristics of the signal. The bandpass filter has a center insertion loss ≤2dB, an in-band flatness ≤±0.5dB, and a suppression degree of stray signals outside the frequency band ≥40dBc. The design of this filter can be adjusted according to the specific frequency band requirements, such as by selecting different filter orders and cutoff frequencies to achieve optimal filtering effect for specific frequency bands.

[0029] The signal after the first filter enters the first amplifier for amplification processing. The first amplifier uses a 50Ω impedance amplifier with an amplification factor ≥14dB and an in-band gain flatness ≤±0.5dB. The design of the amplifier ensures that the signal does not deteriorate in terms of stray, harmonic and flatness during amplification, while the output amplitude is lower than its P-1dB by ≥6dBm. This design not only improves the amplitude of the signal, but also avoids the amplifier from entering a saturated state, thereby ensuring the linear amplification characteristics of the signal.

[0030] The signal amplified by the first amplifier is again adjusted in amplitude by the second attenuator. The second attenuator also uses a π-type fixed attenuator with an impedance of 50Ω. Its function is to appropriately attenuate the amplified signal as needed to meet the input requirements of the subsequent circuit.

[0031] The adjusted signal enters the second filter for further filtering processing. The second filter also uses a bandpass filter, which has the same performance indicators as the first filter, i.e., a center insertion loss ≤2dB, an in-band flatness ≤±0.5dB, and a suppression degree of stray signals outside the frequency band ≥40dBc. Through the design of two-stage bandpass filters, the spectral characteristics of the signal can be further optimized, effectively removing stray signals outside the frequency band and improving the purity and consistency of the signal.

[0032] The signal processed by the second filter enters the second amplifier for re-amplification. The second amplifier also adopts a 50Ω impedance amplifier with an amplification factor ≥ 14dB and an in-band gain flatness ≤ ±0.5dB. The design target is to amplify the signal close to the P-1dB point of the amplifier, while ensuring that the P-1dB of the amplifier is higher than the final output requirement by ≥ 2dB. This design not only improves the amplitude of the signal, but also avoids the amplifier from entering the saturation state, thereby ensuring the linear amplification characteristics of the signal.

[0033] The signal amplified by the second amplifier enters the third filter for harmonic suppression. The third filter adopts a low-pass filter, which mainly functions to suppress the harmonics of the output frequency, ensuring that the harmonic index of the output signal meets the requirements. The suppression degree of the low-pass filter is ≥ 40dBc, and the insertion loss is ≤ 2dB. This high-performance filter can effectively remove the high-frequency harmonic components in the signal, thereby improving the quality and consistency of the signal.

[0034] In order to further improve the environmental adaptability and dynamic adjustment capability of the circuit, the utility model also includes temperature compensation module and dynamic adjustment unit. Temperature compensation module is integrated in the control end of first attenuator and second attenuator, is used for adjusting attenuation according to environmental temperature change. Temperature compensation module can adopt the model for 5R7-001 MCSHANE temperature compensation module, this module is applicable to a variety of temperature compensation scenes, can effectively solve the attenuator performance drift problem caused by environmental temperature change.

[0035] Dynamic adjustment unit is connected to the output end of programmable frequency divider, is used for real-time monitoring signal amplitude fluctuation. When amplitude deviation exceeds ±0.5dB, dynamic adjustment unit will trigger the frequency division ratio of programmable frequency divider to adaptively adjust to 1.05-0.95 frequency division mode, thereby compensating amplitude deviation. This dynamic adjustment mechanism can effectively cope with the real-time change of signal amplitude, ensure the amplitude consistency of output signal, further improve the stability and reliability of the circuit.

[0036] In summary, the utility model realizes the significant improvement of the amplitude consistency of the wideband ping-pong local oscillator output by optimizing the circuit structure and the configuration of each functional module. By reasonably designing the performance parameters of attenuators, frequency dividers, filters and amplifiers, and introducing temperature compensation modules and dynamic adjustment units, the utility model not only solves the problem of poor output amplitude consistency in the prior art, but also improves the environmental adaptability and dynamic adjustment capability of the circuit, making it more suitable for the needs of modern microwave communication systems.

[0037] As can be known by the technical common sense, the utility model can be realized through other implementation solutions without departing from the spirit or essential characteristics. Therefore, the above disclosed implementation solutions are only examples in all aspects, and are not the only ones. All changes within the scope of the utility model or within the scope equivalent to the utility model are included in the utility model.

Claims

1. A circuit for improving the consistency of the output amplitude of a wideband ping-pong local oscillator, characterized by, The circuit comprises a first attenuator, a programmable frequency divider, a first filter, a first amplifier, a second attenuator, a second filter, a second amplifier and a third filter connected in sequence. The input end of the first attenuator is connected to the output end of the ping-pong local oscillator. The programmable frequency divider is configured in a 1 frequency division mode to perform amplitude stabilization on the signal output by the first attenuator.

2. The circuit for improving the consistency of the output amplitude of the wideband ping-pong local oscillator according to claim 1, wherein, The first attenuator and the second attenuator are π type fixed attenuators with an impedance of 50Ω.

3. The circuit for improving the consistency of the output amplitude of the wideband ping-pong local oscillator according to claim 1, wherein, The input amplitude range of the programmable frequency divider is -20dBm to 10dBm, the output amplitude flatness is ≤±1dB, and the phase noise is ≤-153dBc / Hz@100kHz.

4. The circuit for improving the consistency of the output amplitude of a wideband ping-pong local oscillator according to claim 1, wherein, The first filter and the second filter are bandpass filters for suppressing stray signals outside the frequency band, and the first filter and the second filter have a center insertion loss of ≤2dB, an in-band flatness of ≤±0.5dB, and a suppression degree of stray signals outside the frequency band of ≥40dBc.

5. The circuit for improving the consistency of the output amplitude of a wideband ping-pong local oscillator according to claim 1, wherein, The third filter is a low-pass filter, and the third filter has a suppression degree of harmonic signals of ≥40dBc and an insertion loss of ≤2dB.

6. The circuit for improving the consistency of the output amplitude of a wideband ping-pong local oscillator according to claim 1, wherein, The first amplifier is a 50Ω impedance amplifier with an amplification factor of ≥14dB and an in-band gain flatness of ≤±0.5dB. The output amplitude of the first amplifier is lower than its P-1dB by ≥6dBm.

7. The circuit for improving the consistency of the output amplitude of a wideband ping-pong local oscillator according to claim 1, wherein, The second amplifier is a 50Ω impedance amplifier with an amplification factor of ≥14dB and an in-band gain flatness of ≤±0.5dB. The P-1dB of the second amplifier is higher than the final output requirement by ≥2dB.

8. The circuit for improving the output amplitude consistency of a wideband ping-pong local oscillator according to claim 1, characterized in that It further comprises a temperature compensation module. The temperature compensation module is integrated at the control end of the first attenuator and the second attenuator to adjust the attenuation according to the change of the ambient temperature.

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