A radio frequency wideband transceiving spread spectrum system

Abstract

The application provides a radio frequency broadband transceiving spread spectrum system, which comprises a first switch network, a transmitting path, a receiving path, a second switch network and a frequency synthesizer unit. The first switch network has M first bidirectional interfaces at the front end and a first transmitting interface and a first receiving interface at the rear end. The first transmitting interface is connected with the input end of the transmitting path, and the first receiving interface is connected with the output end of the receiving path. The second switch network has a second transmitting interface connected with the output end of the transmitting path and a second receiving interface connected with the input end of the receiving path at the front end. The second switch network has M second bidirectional interfaces at the rear end. The frequency synthesizer unit is connected with each transmitting path and receiving path. The system can avoid replacing equipment and reduce testing cost. The first switch network and the second network enable the system to match between any input port and any output port, thereby greatly reducing the workload of testing multi-port products or multiple products.

Description

TECHNICAL FIELD

[0001] The present application relates to a radio frequency wideband transceiving spread spectrum system. BACKGROUND

[0002] At present, in many microwave communication test equipments, due to the upgrade of new communication standards / protocols, the working frequency of products needs to be increased, and therefore the test equipment also needs to support higher frequency. If the equipment is replaced to support higher frequency, the test cost will be increased. SUMMARY

[0003] The present application provides a radio frequency wideband transceiving spread spectrum system, which can be externally connected to a low frequency device to improve the upper limit of the frequency of the existing test equipment, thereby avoiding replacement of the equipment and reducing the test cost.

[0004] The present application is implemented by the following technical scheme:

[0005] A radio frequency wideband transceiving spread spectrum system, comprising a first switch network, a transmitting path, a receiving path, a second switch network and a frequency synthesizer unit, the first switch network has M first bidirectional interfaces at the front end and a first transmitting interface and a first receiving interface at the rear end, the first transmitting interface is connected with the input end of the transmitting path, the first receiving interface is connected with the output end of the receiving path, the transmitting path comprises a frequency up-conversion module and a switch filter amplification module connected in series, the receiving path comprises a switch filter module and a frequency down-conversion module connected in series, the second switch network has a second transmitting interface connected with the output end of the transmitting path and a second receiving interface connected with the input end of the receiving path at the front end, and has M second bidirectional interfaces at the rear end, and the frequency synthesizer unit is connected with each transmitting path and receiving path to provide local oscillator signals for frequency up-conversion and frequency down-conversion. The first switch network can be externally connected to the existing low frequency device to spread the input frequency to any desired higher frequency, thereby avoiding replacement of the equipment and reducing the test cost. The first switch network and the second network enable the system to match between any input port and any output port, thereby greatly reducing the workload of multi-port product or multi-product testing.

[0006] Further, the first switch network comprises M first 2-way switches, a first M-way multi-select switch and a second M-way multi-select switch, the M first bidirectional interfaces are connected with one end of the M first 2-way switches respectively, the other two ends of each first 2-way switch are connected with the input end of the first M-way multi-select switch and the output end of the second M-way multi-select switch respectively, the output end of the first M-way multi-select switch is the first transmitting interface, and the input end of the second M-way multi-select switch is the first receiving interface, so as to match the input transmitting / receiving signal to the transmitting path or the receiving path, and the design is reasonable and reliable.

[0007] Further, the second switch network comprises M second 2-way switches, a seventh M-way multi-select switch and an eighth M-way multi-select switch, the M second bidirectional interfaces are connected with one end of the M second 2-way switches respectively, the other two ends of each second 2-way switch are connected with the input end of the seventh M-way multi-select switch and the output end of the eighth M-way multi-select switch respectively, the output end of the seventh M-way multi-select switch is the second receiving interface, and the input end of the eighth M-way multi-select switch is the second transmitting interface, so that the transmitted or received signals are matched to the correct output port, and the design is reasonable and reliable.

[0008] Further, the transmitting path comprises a first mixer, a third N-way multi-select switch connected with the output end of the first mixer, N first band-pass filters connected with N output ends of the third N-way multi-select switch through N switches respectively, a fourth N-way multi-select switch with N input ends connected with N output ends of the N first band-pass filters respectively, and an output end of the fourth N-way multi-select switch connected with the second transmitting interface of the second switch network, and two input ends of the first mixer connected with the first transmitting interface of the first switch network and the frequency synthesizer unit respectively.

[0009] Further, the transmitting path further comprises an adjustable attenuator connected in series between the first transmitting interface of the first switch network and the first mixer, a first wideband amplifier connected in series between the first mixer and the third N-way multi-select switch, and N power amplifiers connected in series between each band-pass filter and the fourth N-way multi-select switch respectively.

[0010] Further, the receiving path comprises a fifth N-way multi-select switch, N second band-pass filters, a sixth N-way multi-select switch and a second mixer, an input end of the fifth N-way multi-select switch connected with the second receiving interface of the second switch network, N output ends connected with input ends of the N second band-pass filters respectively, output ends of the N second band-pass filters connected with N input ends of the sixth N-way multi-select switch respectively, an output end of the sixth N-way multi-select switch and the frequency synthesizer unit connected with two input ends of the second mixer respectively, and an output end of the second mixer connected with the first receiving interface of the first switch network.

[0011] Further, the receiving path further comprises a low-noise amplifier connected in series between the second receiving interface of the second switch network and the fifth N-way multi-select switch, a wideband amplifier connected in series between the sixth N-way multi-select switch and the second mixer, a low-pass filter and a gain-adjustable amplifier connected in series between the second mixer and the first receiving interface of the first switch network.

[0012] Further, the frequency synthesizing unit comprises a reference input interface, a detector and a first phase-locked loop connected with the reference input interface respectively, a second 2-way switch with two input ends connected with the output end of the first phase-locked loop and a constant voltage respectively, an oscillator with an input end connected with the output end of the second 2-way switch, a reference output interface connected with the output end of the oscillator, a second phase-locked loop and a third phase-locked loop connected with the output end of the oscillator respectively, the output ends of the second phase-locked loop and the third phase-locked loop connected with the transmitting path and the receiving path respectively, and the output end of the second phase-locked loop or the third phase-locked loop also as a frequency output interface. The frequency synthesizing unit has the functions of high-quality reference signal output and high-quality frequency signal output.

[0013] Further, the frequency synthesizing unit comprises a reference input interface, a detector and a first phase-locked loop connected with the reference input interface respectively, a second 2-way switch with two input ends connected with the output end of the first phase-locked loop and a constant voltage respectively, an oscillator with an input end connected with the output end of the second 2-way switch, a reference output interface connected with the output end of the oscillator, a second phase-locked loop and a third phase-locked loop connected with the output end of the oscillator respectively, the output ends of the second phase-locked loop and the third phase-locked loop connected with the transmitting path and the receiving path respectively, and the output end of the second phase-locked loop or the third phase-locked loop also as a frequency output interface. The frequency synthesizing unit has the functions of high-quality reference signal output and high-quality frequency signal output.

[0014] Further, the frequency synthesizing unit comprises a reference input interface, a detector and a first phase-locked loop connected with the reference input interface respectively, a second 2-way switch with two input ends connected with the output end of the first phase-locked loop and a constant voltage respectively, an oscillator with an input end connected with the output end of the second 2-way switch, a reference output interface connected with the output end of the oscillator, a second phase-locked loop and a third phase-locked loop connected with the output end of the oscillator respectively, the output ends of the second phase-locked loop and the third phase-locked loop connected with the transmitting path and the receiving path respectively, and the output end of the second phase-locked loop or the third phase-locked loop also as a frequency output interface. The frequency synthesizing unit has the functions of high-quality reference signal output and high-quality frequency signal output. BRIEF DESCRIPTION OF DRAWINGS

[0015] The application will be further described in detail below with reference to the accompanying drawings.

[0016] Figure 1 The application is a schematic diagram.

[0017] Figure 2 The application is a circuit diagram of the first switch network.

[0018] Figure 3 The application is a circuit diagram of the second switch network.

[0019] Figure 4 The application is a circuit diagram of the transmitting path.

[0020] Figure 5 The application is a circuit diagram of the receiving path.

[0021] Figure 6 The application is a circuit diagram of the frequency synthesizing unit.

[0022] Figure 7 The application is a schematic diagram of the control unit.

[0023] In the drawings, 1 is the first switch network; 2 is the transmitting path; 3 is the receiving path; 4 is the second switch network; 5 is the frequency synthesizing unit; 6 is the control unit; and 7 is the power supply unit. DETAILED DESCRIPTION

[0024] As Figures 1 to 7As shown, the radio frequency broadband transceiver spread spectrum system comprises a first switch network 1, a transmitting path 2, a receiving path 3, a second switch network 4, a frequency synthesizer unit 5, a control unit 6 and a power supply unit 7. The control unit 6 is realized by an MCU, which has a group of control interfaces connectable with a host computer externally, and is connected with each transmitting path 2, each receiving path 3 and the frequency synthesizer unit 5 internally to provide the required control signals. The power supply unit 7 is connected with a power supply externally, and is connected with each transmitting path 2, each receiving path 3, the frequency synthesizer unit 5 and the control unit 6 internally to provide power supply. The frequency synthesizer unit 5 is used to generate various frequencies required by the system, and its external interfaces include a reference input interface, a reference output interface and a frequency output interface, which can be used for local oscillator monitoring, or directly used as a frequency source, and the signal quality of the reference output and the frequency output only depends on the built-in high-quality oscillator. The frequency synthesizer unit 5 is connected with each transmitting path 2 and receiving path 3 internally to provide local oscillator signals. The frequency synthesizer has a built-in reference selection function, which can automatically switch to the internal reference signal when there is no external reference input signal or the external reference input signal is too small.

[0025] Figure 2 For example, the first switch network 1 has three first bidirectional interfaces Tx1 / Rx1-Tx3 / Rx3 at the front end, and has a first transmitting interface Tx' and a first receiving interface Rx' at the rear end, the first transmitting interface Tx' is connected with the input end of the transmitting path 2, and the first receiving interface Rx' is connected with the output end of the receiving path 3, the transmitting path 2 comprises a serially connected up-conversion module and a switch filter amplification module, the receiving path 3 comprises a serially connected switch filter module and a down-conversion module, the second switch network 4 has a second transmitting interface Tx connected with the output end of the transmitting path 2 and a second receiving interface Rx connected with the input end of the receiving path 3 at the front end, and has three second bidirectional interfaces RF1-RF3 at the rear end, and the frequency synthesizer unit 5 is connected with each transmitting path 2 and receiving path 3 to provide local oscillator signals for up-conversion and down-conversion.

[0026] In the embodiment, the first switch network 1 comprises three first 2-way switches K1, a first 3-way multi-select switch K2 and a second 3-way multi-select switch K3. The three first bidirectional interfaces are connected to one end of the three first 2-way switches K1 respectively. The other two ends of each first 2-way switch K1 are connected to the input end of the first 3-way multi-select switch K2 and the output end of the second 3-way multi-select switch K3 respectively. The output end of the first 3-way multi-select switch K2 is the first transmitting interface Tx'. The input end of the second 3-way multi-select switch K3 is the first receiving interface Rx'. The second switch network 4 comprises three second 2-way switches K4, a seventh 3-way multi-select switch K5 and an eighth 3-way multi-select switch K6. The three second bidirectional interfaces are connected to one end of the three second 2-way switches K4 respectively. The other two ends of each second 2-way switch K4 are connected to the input end of the seventh 3-way multi-select switch K5 and the output end of the eighth 3-way multi-select switch K6 respectively. The output end of the seventh 3-way multi-select switch K5 is the second receiving interface Rx. The input end of the eighth 3-way multi-select switch K6 is the second transmitting interface Rx.

[0027] In the embodiment, the transmitting path 2 comprises a first mixer, a third N-way multi-select switch K7, N switches K8, N first band-pass filters LB1, a fourth N-way multi-select switch K9, an adjustable attenuator A1, a first wideband amplifier D1 and N power amplifiers D2. The input end of the adjustable attenuator A1 is the input end of the transmitting path 2 and is connected to the first transmitting interface Tx' of the first switch network 1. The output end of the adjustable attenuator A1 is connected to one input end of the first mixer. The other input end of the first mixer is connected to the frequency synthesizer unit 5 which provides the up-conversion local oscillation signal for the first mixer. The output end of the first mixer is connected to the input end of the first wideband amplifier D1. The output end of the first wideband amplifier D1 is connected to the input end of the third N-way multi-select switch K7. The N output ends of the third N-way multi-select switch K7 are connected to the input ends of the N switches K8 respectively. The output ends of the N switches K8 are connected to the input ends of the N first band-pass filters LB1 respectively. The output ends of the N first band-pass filters LB1 are connected to the input ends of the N power amplifiers D2 respectively. The output ends of the N power amplifiers D2 are connected to the N input ends of the fourth N-way multi-select switch K9 respectively. The output end of the fourth N-way multi-select switch K9 is the output end of the transmitting path 2 and is connected to the second transmitting interface Tx of the second switch network 4. The adjustable attenuator A1 and the first mixer constitute an up-conversion module and the rest components constitute a switch-filter-amplifier module. The first mixer is realized by a multiplier. The bandwidths of the N first band-pass filters LB1 are different from each other.

[0028] The receiving path 3 comprises a fifth N-way multi-select switch K10, a second band-pass filter LB2, a sixth N-way multi-select switch K11, a second mixer, a low-noise amplifier D3, a wideband amplifier D4, a low-pass filter LPF and a gain-adjustable amplifier D5. The input end of the low-noise amplifier D3 is the input end of the receiving path 3 and is connected with the second receiving end Rx of the second switch network 4. The output end of the low-noise amplifier D3 is connected with the input end of the fifth N-way multi-select switch K10. The N output ends of the fifth N-way multi-select switch K10 are respectively connected with the input ends of the N second band-pass filters LB2. The output ends of the N second band-pass filters LB2 are respectively connected with the N input ends of the sixth N-way multi-select switch K11. The output end of the sixth N-way multi-select switch K11 is connected with the input end of the wideband amplifier D4. The output end of the wideband amplifier D4 is connected with one input end of the second mixer. The other input end of the second mixer is connected with the frequency synthesis unit 5. The frequency synthesis unit 5 provides a frequency down-conversion local oscillation signal for the second mixer. The output end of the second mixer is connected with the input end of the low-pass filter LPF. The output end of the low-pass filter LPF is connected with the input end of the gain-adjustable amplifier D5. The output end of the gain-adjustable amplifier D5 is the output end of the receiving path 3 and is connected with the first receiving interface Rx' of the first switch network 1. The second mixer, the low-pass filter D3 and the gain-adjustable amplifier D5 constitute a frequency down-conversion module, and the remaining components constitute a switch-filter module. The second mixer is implemented by a multiplier.

[0029] The frequency synthesis unit 5 comprises a reference input interface, a detector and a first phase-locked loop (PLL0) connected with the reference input interface respectively, a second 2-way switch K12 with two input ends connected with the output end of the first phase-locked loop and a constant voltage respectively, an oscillator with an input end connected with the output end of the second 2-way switch K12, a reference output interface connected with the output end of the oscillator, a second phase-locked loop (PLL1+VCO1) and a third phase-locked loop (PLL2+VCO2) connected with the output end of the oscillator respectively, the output ends of the second phase-locked loop and the third phase-locked loop being connected with the transmitting path 2 and the receiving path 3 respectively, and the output end of the second phase-locked loop or the third phase-locked loop also serving as a frequency output interface.

[0030] The above description is only the preferred embodiment of the present application, and thus cannot limit the scope of the present application. Any equivalent changes and modifications made according to the patent application scope and the content of the present application should still be within the scope of the present application.

Claims

1. A radio frequency broadband transceiver spread spectrum system, characterized in that: The system includes a first switching network, a transmitting path, a receiving path, a second switching network, and a frequency synthesizer unit. The first switching network has M first bidirectional interfaces at its front end and a first transmitting interface and a first receiving interface at its rear end. The first transmitting interface is connected to the input of the transmitting path, and the first receiving interface is connected to the output of the receiving path. The transmitting path includes a series-connected up-conversion module and a switching filter amplification module. The receiving path includes a series-connected switching filter module and a down-conversion module. The second switching network has a second transmitting interface connected to the output of the transmitting path and a second receiving interface connected to the input of the receiving path at its front end. The second switching network has M second bidirectional interfaces at its rear end. The frequency synthesizer unit is connected to each transmitting path and receiving path to provide up-converted and down-converted local oscillator signals. The first switching network includes M first 2-way switches, a first M-way multi-select switch, and a second M-way multi-select switch. The M first bidirectional interfaces are each connected to one end of the M first 2-way switches, and the other two ends of each first 2-way switch are connected to the input of the first M-way multi-select switch and the output of the second M-way multi-select switch, respectively. The output of the first M-way multi-select switch is the first transmit interface, and the input of the second M-way multi-select switch is the first receive interface. The second switch network includes M second 2-way switches, a seventh M-way multi-select switch, and an eighth M-way multi-select switch. The M second bidirectional interfaces are connected to one end of each of the M second 2-way switches, and the other two ends of each second 2-way switch are connected to the input of the seventh M-way multi-select switch and the output of the eighth M-way multi-select switch, respectively. The output of the seventh M-way multi-select switch is the second receive interface, and the input of the eighth M-way multi-select switch is the second transmit interface. The transmit path includes a first mixer, a third N-way multi-select switch whose input is connected to the output of the first mixer, N first bandpass filters connected to the N outputs of the third N-way multi-select switch via N switches, and a fourth N-way multi-select switch whose N inputs are connected to the outputs of the N first bandpass filters. The output of the fourth N-way multi-select switch is connected to the second transmit interface of the second switch network, and the two inputs of the first mixer are connected to the first transmit interface and the frequency synthesizer unit of the first switch network, respectively.

2. The radio frequency broadband transceiver spread spectrum system according to claim 1, characterized in that: The transmission path also includes an adjustable attenuator connected in series between the first switching network and the first mixer, a first broadband amplifier connected in series between the first mixer and the third N-way multiplexer, and N power amplifiers connected in series between each bandpass filter and the fourth N-way multiplexer.

3. A radio frequency broadband transceiver spread spectrum system according to claim 1 or 2, characterized in that: The receiving path includes a fifth N-way multi-select switch, N second bandpass filters, a sixth N-way multi-select switch, and a second mixer. The input terminal of the fifth N-way multi-select switch is connected to the second receiving interface of the second switch network, and its N output terminals are respectively connected to the input terminals of the N second bandpass filters. The output terminals of the N second bandpass filters are respectively connected to the N input terminals of the sixth N-way multi-select switch. The output terminal of the sixth N-way multi-select switch and the frequency synthesis unit are respectively connected to the two input terminals of the second mixer. The output terminal of the second mixer is connected to the first receiving interface of the first switch network.

4. The radio frequency broadband transceiver spread spectrum system according to claim 3, characterized in that: The receiving path also includes a low-noise amplifier connected in series between the second receiving interface of the second switching network and the fifth N-way multi-select switch, a broadband amplifier connected in series between the sixth N-way multi-select switch and the second mixer, a low-pass filter connected in series between the second mixer and the first receiving interface of the first switching network, and a gain-adjustable amplifier.

5. A radio frequency broadband transceiver spread spectrum system according to claim 1 or 2, characterized in that: The frequency synthesis unit includes a reference input interface, a detector and a first phase-locked loop (PLL) connected to the reference input interface, a second two-way switch with two input terminals connected to the output terminal of the first PLL and a constant voltage, an oscillator with an input terminal connected to the output terminal of the second two-way switch, a reference output interface connected to the output terminal of the oscillator, a second PLL and a third PLL connected to the output terminal of the oscillator, the output terminals of the second PLL and the third PLL being connected to the transmit path and the receive path, respectively, and the output terminal of the second PLL or the third PLL also serving as a frequency output interface.

6. A radio frequency broadband transceiver spread spectrum system according to claim 1 or 2, characterized in that: It also includes control units that are connected to each transmit path, each receive path and frequency synthesis unit respectively, and power supply units that are connected to each transmit path, each receive path, frequency synthesis unit and control unit respectively.

7. The radio frequency broadband transceiver spread spectrum system according to claim 6, characterized in that: The control unit is implemented by an MCU.

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