Ka-band up-conversion power amplifier

Abstract

The invention discloses a Ka-band up-conversion power amplifier which comprises an intermediate-frequency driving unit, a primary local oscillator and frequency conversion unit and a secondary local oscillator and frequency conversion unit which are connected in sequence. The intermediate frequency driving unit comprises an attenuator I, a numerical control attenuator, an amplifier I, a temperature compensation attenuator I and a low-pass filter which are connected in sequence; the primary local oscillator and frequency conversion unit comprises an attenuator II, a frequency mixer I, a temperature compensation attenuator II and a band-pass filter I which are connected in sequence, and the attenuator II is connected with a low-pass filter; the input end of the mixer I is also connected with an attenuator III, a low noise amplifier and a first frequency source in sequence; the secondary local oscillator and frequency conversion unit comprises an attenuator IV, a frequency mixer II, an attenuator V, a band-pass filter II, an amplifier II and an electrically controlled attenuator which are connected in sequence; the attenuator IV is connected with the band-pass filter I; the input end of the second frequency mixer is further connected with a sixth attenuator, a third band-pass filter, a third amplifier, a frequency multiplier and a second frequency source in sequence. According to the invention, 950 MHz to 1950 MHz can be converted into 27.5 GHz-31 GHz, so that large-span frequency conversion is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of power amplifiers, and in particular to a Ka-band up-conversion power amplifier. Background Art

[0002] With the continuous development of electronic communication technology, the microwave spectrum has become extremely crowded, and mutual interference between signals has become more and more common and serious. Therefore, in order to reduce communication pressure, it is very necessary to develop microwave millimeter waves with higher frequency and shorter wavelength.

[0003] Electromagnetic waves with a frequency of 300MHz-300GHz are usually called microwaves. Compared with low-frequency signals, microwaves have the characteristics of short wavelength and strong penetration, and have strong interactions with suspended particulate gases and water-containing substances in the atmosphere. Therefore, microwaves occupy an important position in modern communications, satellites, topographic mapping, electronic countermeasures and other fields, and have a great impact on people's daily lives. The Ka band operates in the frequency range of 26.5 to 40GHz, provides high data rates, and is widely used in commercial and military applications.

[0004] The transceiver system plays a very important role in the signal transmission of high-frequency systems. A transceiver system with good indicators can greatly reduce the design difficulty of the entire system. In a transceiver system, the frequency converter is a very important device, which has a great impact on the various performance indicators of the transceiver system. Frequency converters can be divided into up-converters and down-converters according to their functions. The function of the up-converter is to convert the received low-frequency signal into a high-frequency signal through frequency conversion and then transmit it. The up-converter is generally used in the transmitting system. The function of the down-converter is to convert the received high-frequency signal into a low-frequency signal through frequency conversion and then transmit it. The up-converter is generally used in the receiving system. Due to the high frequency of the Ka-band, the research on the Ka-band up-converter has great significance and role in the communication of the Ka-band at home and abroad. Summary of the invention

[0005] In view of the above problems, the present invention aims to provide a Ka-band up-conversion power amplifier.

[0006] The technical solution of the present invention is as follows:

[0007] A Ka-band up-conversion power amplifier comprises an intermediate frequency driving unit, a primary local oscillator and a frequency conversion unit, and a secondary local oscillator and a frequency conversion unit which are connected in sequence;

[0008] The intermediate frequency driving unit comprises an attenuator 1, a digitally controlled attenuator, an amplifier 1, a temperature-compensated attenuator 1 and a low-pass filter which are connected in sequence;

[0009] The primary local oscillator and frequency conversion unit comprises an attenuator 2, a mixer 1, a temperature-compensated attenuator 2 and a band-pass filter 1 which are connected in sequence, the input end of the attenuator 2 is connected to the output end of the low-pass filter; the input end of the mixer 1 is also connected to an attenuator 3, a low-noise amplifier and a first frequency source in sequence;

[0010] The secondary local oscillator and frequency conversion unit includes an attenuator four, a mixer two, an attenuator five, a bandpass filter two, an amplifier two and an electrically adjustable attenuator which are connected in sequence. The input end of the attenuator four is connected to the output end of the bandpass filter one; the input end of the mixer two is also connected to the attenuator six, the bandpass filter three, the amplifier three, the frequency multiplier and the second frequency source in sequence.

[0011] Preferably, the digitally controlled attenuator adopts the digitally controlled attenuator of model HG166SF-1.

[0012] Preferably, the amplifier 1 is an amplifier of model HG113FG.

[0013] Preferably, the input signal of the Ka-band up-conversion power amplifier is 950-1950 MHz, the point frequency source model of the primary local oscillator and frequency conversion unit is ASH1B, and the point frequency source model of the secondary local oscillator and frequency conversion unit is ASH931.

[0014] Preferably, the model of the mixer 1 is HG124H3, and the model of the mixer 2 is MWM010.

[0015] The beneficial effects of the present invention are:

[0016] The present invention can transform 950MHz-1950MHz to 27.5GHz-31GHz, thus realizing large-span frequency conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a schematic diagram of the structure of the Ka-band up-conversion power amplifier of the present invention. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments in this application and the technical features in the embodiments can be combined with each other. It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as those generally understood by those of ordinary skill in the art to which this application belongs. The words "including" or "comprising" and the like used in the disclosure of the present invention mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0020] like Figure 1 As shown, the present invention provides a Ka-band up-conversion power amplifier, comprising an intermediate frequency driving unit, a primary local oscillator and a frequency conversion unit, and a secondary local oscillator and a frequency conversion unit connected in sequence;

[0021] The intermediate frequency driving unit comprises an attenuator 1, a digitally controlled attenuator, an amplifier 1, a temperature-compensated attenuator 1 and a low-pass filter which are connected in sequence;

[0022] The primary local oscillator and frequency conversion unit comprises an attenuator 2, a mixer 1, a temperature-compensated attenuator 2 and a band-pass filter 1 which are connected in sequence, the input end of the attenuator 2 is connected to the output end of the low-pass filter; the input end of the mixer 1 is also connected to an attenuator 3, a low-noise amplifier and a first frequency source in sequence;

[0023] The secondary local oscillator and frequency conversion unit includes an attenuator four, a mixer two, an attenuator five, a bandpass filter two, an amplifier two and an electrically adjustable attenuator which are connected in sequence. The input end of the attenuator four is connected to the output end of the bandpass filter one; the input end of the mixer two is also connected to the attenuator six, the bandpass filter three, the amplifier three, the frequency multiplier and the second frequency source in sequence.

[0024] In the present invention, the main function of the intermediate frequency drive unit is to filter the input 950-1950MHz signal, amplify and control the gain. The pre-stage filter mainly suppresses the signal that may be leaked and other stray signals. The suppression requirement of this filter is not high, and the selectivity is relatively large. In a specific embodiment, the equalization filter chip produced by China Electronics 13 is used, which can pass the 950-2150MHZ intermediate frequency signal and perform 4.5dB equalization processing, which can not only suppress the low-end stray but also make up for the amplitude-frequency characteristic degradation caused by devices such as amplifiers. The digital control attenuator adopts HG166SF-1, which can realize dynamic 31dB step 1dB gain variable control, and its performance parameters are shown in Table 1. Amplifier 1 adopts HG113FG, which can provide an output power of about 20.5dBm and a gain of about 20.5dB, and its performance parameters are shown in Table 2.

[0025] Table 1 Performance parameters of HG166SF-1 digital controlled attenuator

[0026] Electrical properties (T A =25℃, Vdd=+5V)

[0027]

[0028] Table 2 HG113FG amplifier performance parameters

[0029] Electrical properties (T A =25℃, Vdd=+5V)

[0030]

[0031] In the present invention, the local oscillator function of the primary local oscillator and frequency conversion unit and the secondary local oscillator and frequency conversion unit is to generate a suitable local oscillator signal. Since 950MHz-1950MHz is converted to 27.5GHz-31GHz, the frequency conversion span is large. If only one local oscillator is used, it will be difficult to meet the indicators such as spurious signals. Therefore, the present invention adopts a secondary up-conversion scheme to achieve this.

[0032] Because the output frequency of 27.5GHz-31GHz is too wide, 27.5GHz-31GHz is divided into four frequency segments, namely 27.5GHz-28.5GHz, 28.35GHz-29.35GHz, 29GHz-30GHz, and 30GHz-31GHz. Because secondary frequency conversion is used, the local oscillator of the primary frequency conversion is set to 5.05GHz, and the local oscillator of the secondary frequency conversion is 21.5GHz, 22.35GHz, 23GHz, and 24GHz. In a specific embodiment, the point frequency source model using primary frequency conversion is ASH1B, and the performance parameters are as follows:

[0033] Input signal

[0034] Frequency: 100MHz

[0035] Power: (0-5)dBm

[0036] Phase noise: ≤-145dBc / Hz@1kHz

[0037] Voltage VCC: (3.3±0.1)V

[0038] Input signal

[0039] Output frequency: 5050MHz

[0040] Output power: (6±2)dBm

[0041] Phase noise: ≤-80dBc / Hz@100Hz; ≤-92dBc / Hz@1kHz; ≤-100dBc / Hz@10kHz;

[0042] Spurious: ≤-65dBc

[0043] Second harmonic: ≤-10dBc

[0044] Lock indication LD: locked (2.7V-3.5V), unlocked (≤0.2V)

[0045] VCC current: ≤130mA

[0046] Size: 15.0mm*12.0mm*2.5mm

[0047] Weight: ≤2g

[0048] Working temperature: -55℃-85℃

[0049] Storage temperature: -55℃-85℃

[0050] The frequency source model used for secondary frequency conversion is ASH931, and its performance parameters are shown in Table 3.

[0051] Table 3ASH931 frequency source performance parameters

[0052]

[0053] The mixing function of the primary local oscillator and frequency conversion unit and the secondary local oscillator and frequency conversion unit is to mix the intermediate frequency signal of 950-1950MHz with the local oscillator signal in the mixer and output a radio frequency signal of 27.5GHz-31GHz. The present invention adopts secondary frequency conversion, so two mixers are required. In a specific embodiment, the mixer model of the primary frequency conversion is HG124H3, and its performance parameters are shown in Table 4, and the mixer model of the secondary frequency conversion is MWM010, and its performance parameters are shown in Table 5.

[0054] Table 4 HG124H3 mixer performance parameters

[0055] Electrical properties (T A =25℃)

[0056]

[0057] Table 5 MWM010 mixer performance parameters

[0058] Typical electrical parameters, TA = +25°C (on-chip test results, local oscillator drive power +13dBm)

[0059] parameter Minimum Typical Value Maximum unit RF Bandwidth 19 39 GHz LO Bandwidth 19 39 GHz IF Bandwidth DC 10 GHz Frequency Conversion Loss 11 dB LO-RF IsoIation 35 dB LO-IF Isolation 37 dB RF-IF Isolation 17 dB

[0060] 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 technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification 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 still falls within the scope of the technical solution of the present invention.

Claims

1. A Ka-band up-conversion power amplifier, characterized in that: It includes an intermediate frequency drive unit, a primary local oscillator and a frequency conversion unit, and a secondary local oscillator and a frequency conversion unit which are connected in sequence; The intermediate frequency driving unit comprises an attenuator 1, a digitally controlled attenuator, an amplifier 1, a temperature-compensated attenuator 1 and a low-pass filter which are connected in sequence; The primary local oscillator and frequency conversion unit comprises an attenuator 2, a mixer 1, a temperature-compensated attenuator 2 and a band-pass filter 1 which are connected in sequence, the input end of the attenuator 2 is connected to the output end of the low-pass filter; the input end of the mixer 1 is also connected to an attenuator 3, a low-noise amplifier and a first frequency source in sequence; The secondary local oscillator and frequency conversion unit includes an attenuator four, a mixer two, an attenuator five, a bandpass filter two, an amplifier two and an electrically adjustable attenuator which are connected in sequence. The input end of the attenuator four is connected to the output end of the bandpass filter one; the input end of the mixer two is also connected to the attenuator six, the bandpass filter three, the amplifier three, the frequency multiplier and the second frequency source in sequence.

2. The Ka-band up-conversion power amplifier according to claim 1, characterized in that: The digital controlled attenuator adopts the digital controlled attenuator of model HG166SF-1.

3. The Ka-band up-conversion power amplifier according to claim 1, characterized in that: The amplifier 1 is an amplifier of the HG113FG model.

4. The Ka-band up-conversion power amplifier according to claim 1, characterized in that: The input signal of the Ka-band up-conversion power amplifier is 950-1950 MHz, the point frequency source model of the primary local oscillator and frequency conversion unit is ASH1B, and the point frequency source model of the secondary local oscillator and frequency conversion unit is ASH931.

5. The Ka-band up-conversion power amplifier according to claim 1, characterized in that: The model of the mixer 1 is HG124H3, and the model of the mixer 2 is MWM010.

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