CN220210431U - Signal transmitting device and testing machine - Google Patents
Signal transmitting device and testing machine Download PDFInfo
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- CN220210431U CN220210431U CN202320753068.1U CN202320753068U CN220210431U CN 220210431 U CN220210431 U CN 220210431U CN 202320753068 U CN202320753068 U CN 202320753068U CN 220210431 U CN220210431 U CN 220210431U
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Abstract
The utility model discloses a signal transmitting device and a tester. The signal transmitting apparatus includes: the device comprises a signal generation circuit, an up-conversion signal synthesis circuit and a signal conditioning circuit, wherein the signal generation circuit is used for generating a signal to be modulated; the up-conversion signal synthesis circuit is connected with the signal generation circuit through a first switch array and comprises a first up-conversion signal synthesis circuit and a second up-conversion signal synthesis circuit; the first up-conversion signal synthesis circuit mixes the signal to be modulated with the low-frequency local oscillation signal to generate a low-frequency radio frequency signal; the second up-conversion signal synthesis circuit mixes the signal to be modulated with the high-frequency local oscillation signal to generate a high-frequency radio frequency signal; the signal conditioning circuit comprises a plurality of signal conditioning channels; the signal conditioning circuit is used for switching the signal conditioning channel to adjust the amplitude of the low-frequency radio frequency signal or the amplitude of the high-frequency radio frequency signal to obtain a target radio frequency signal, and the problem that the amplitude of the wide-frequency radio frequency signal is difficult to adjust with high precision in the related art is solved.
Description
Technical Field
The present disclosure relates to communication technologies, and in particular, to a signal transmitting device and a testing machine.
Background
In the field of wireless communication and semiconductor test equipment, the amplitude of an output and input radio frequency signal can be adjusted and controlled so as to meet the requirements of wireless communication and chip test to be tested. With the development of wireless communication technology, many radio frequency chips need to support Sub 8G to meet the test requirements of 5G NR and WiFi7 at 7.125 frequency, the frequency range of semiconductor test equipment used for testing radio frequency chips needs to be covered to 50 MHz-8 GHz, and the amplitude adjustment precision needs to reach +/-0.5dB at the power range of-130 dBm-20 dBm.
When the amplitude adjustment is carried out, if a radio frequency link uses a narrow frequency circuit, the amplitude equalization can reach the expected precision, but the frequency range is relatively narrow, the power range is only-10 dBm-20 dBm, and the amplitude equalization precision under the broadband of 50 MHz-8 GHz can not be met; if the radio frequency link uses a broadband circuit, the compensation is performed by adopting an amplitude equalizer, the amplitude equalization precision is improved to a limited extent, and the frequency range is limited to 50 MHz-6 GHz; if the ultra-wideband circuit is realized by adopting a multi-path narrowband circuit synthesis mode, the purpose of high-precision wideband radio frequency signal amplitude can be achieved, but the circuit size is huge and the cost is high.
Aiming at the problem that the amplitude of a radio frequency signal in a wide frequency range is difficult to adjust with high precision in the related art, no effective solution is proposed at present.
Disclosure of Invention
The utility model provides a signal transmitting device and a testing machine, which are used for solving the problem that the amplitude of a radio frequency signal in a wide frequency range is difficult to adjust with high precision in the related art.
According to one aspect of the present utility model, a signal transmitting apparatus is provided. The device comprises: the input end of the up-conversion signal synthesis circuit is connected with the signal generation circuit through a first switch array, and the output end of the up-conversion signal synthesis circuit is connected with the input end of the signal conditioning circuit; the signal generation circuit is used for generating a signal to be modulated; the up-conversion signal synthesis circuit comprises a first up-conversion signal synthesis circuit and a second up-conversion signal synthesis circuit; the first up-conversion signal synthesis circuit is used for mixing a signal to be modulated with a low-frequency local oscillation signal to generate a low-frequency radio frequency signal; the second up-conversion signal synthesis circuit is used for mixing a signal to be modulated with a high-frequency local oscillation signal to generate a high-frequency radio frequency signal; the signal conditioning circuit comprises a plurality of signal conditioning channels; the signal conditioning circuit is used for switching the signal conditioning channel so as to adjust the amplitude of the low-frequency radio frequency signal or the amplitude of the high-frequency radio frequency signal to obtain a target radio frequency signal.
Optionally, the apparatus further comprises: and the signal detection circuit is connected with the output end of the signal conditioning circuit and is used for detecting the amplitude-frequency characteristic information of the target radio frequency signal.
Optionally, the signal detection circuit includes: the detection circuit is connected with the output end of the signal conditioning circuit and is used for detecting the power of the target radio frequency signal output by the signal conditioning circuit to obtain a voltage signal; and the analog-to-digital converter is connected with the detection circuit and is used for performing analog-to-digital conversion on the voltage signal to obtain amplitude-frequency characteristic information.
Optionally, the signal generating circuit comprises a signal generator, the signal generator comprising: the data buffer is connected with the signal detection circuit and used for storing a waveform file, wherein the waveform file is used for generating a digital signal to be compensated; and the digital filter is used for adjusting the amplitude of the digital signal to be compensated at different frequency points according to the amplitude compensation signal to obtain a digital compensation signal, wherein the amplitude compensation signal is an amplitude compensation signal matched with the amplitude-frequency characteristic information of the target radio frequency signal.
Optionally, the signal conditioning circuit comprises: at least one signal attenuator; at least one signal amplifier; the second switch array comprises a plurality of switches, and a plurality of signal conditioning channels are formed by controlling the switches of the second switch array to gate signal attenuators with different attenuation factors and/or signal amplifiers with different amplification factors.
Optionally, in the case that the number of the signal attenuator and the signal amplifier is two, the second switch array includes a first single-pole double-throw switch, a second single-pole double-throw switch, a third single-pole double-throw switch, a fourth single-pole double-throw switch, and a fifth single-pole double-throw switch; the two movable contacts of the first single-pole double-throw switch are respectively connected with the output end of the first up-conversion signal synthesis circuit and the output end of the second up-conversion signal synthesis circuit, the input end of the first signal attenuator is used for being connected with the fixed contact of the first single-pole double-throw switch, the output end of the first signal attenuator is connected with the fixed contact of the second single-pole double-throw switch, the first movable contact of the second single-pole double-throw switch is connected with the input end of the first signal amplifier, the second movable contact of the second single-pole double-throw switch is connected with the second movable contact of the third single-pole double-throw switch through a first through path, the first movable contact of the third single-pole double-throw switch is connected with the output end of the first signal amplifier, the fixed contact of the third single-pole double-throw switch is used for being connected with the input end of the second signal attenuator, the output end of the fourth single-pole double-throw switch is connected with the fixed contact of the fourth single-pole double-throw switch through a second through a first through path, and the second movable contact of the fourth single-pole double-throw switch is connected with the fifth single-pole double-throw switch through a second through path.
Optionally, the signal generating circuit further includes: the first digital-to-analog converter is used for performing digital-to-analog conversion on the initial digital signal to obtain a first signal to be modulated; the second digital-to-analog converter is used for performing digital-to-analog conversion on the initial digital signal to obtain a second signal to be modulated, wherein the first signal to be modulated and the second signal to be modulated have the same frequency, and the first signal to be modulated and the second signal to be modulated form the signal to be modulated.
Optionally, the first up-conversion signal synthesizing circuit includes: the first mixer is used for mixing a first signal to be modulated with the low-frequency local oscillation signal to obtain a first mixed signal; the second mixer is used for mixing the second signal to be modulated with the low-frequency local oscillation signal to obtain a second mixed signal; the first signal processing chip is used for carrying out phase quadrature processing on the first mixed signal and the second mixed signal to obtain a low-frequency radio frequency signal; the second up-conversion signal synthesizing circuit includes: the third mixer is used for mixing the first signal to be modulated with the high-frequency local oscillation signal to obtain a third mixed signal; the fourth mixer is used for mixing the second signal to be modulated with the high-frequency local oscillation signal to obtain a fourth mixed signal; and the second signal processing chip is used for carrying out phase quadrature processing on the third mixed signal and the fourth mixed signal to obtain a high-frequency radio frequency signal.
Optionally, the first up-conversion signal synthesizing circuit further includes: the third signal amplifier is arranged at the output end of the first signal processing chip and is used for carrying out signal amplification processing on the low-frequency radio frequency signal; and the fourth signal amplifier is arranged at the output end of the second signal processing chip and is used for carrying out signal amplification processing on the high-frequency radio-frequency signal.
According to another aspect of the present utility model there is provided a testing machine comprising a signal emitting device as described above.
The utility model provides a signal transmitting device and a testing machine, comprising: the input end of the up-conversion signal synthesis circuit is connected with the signal generation circuit through a first switch array, and the output end of the up-conversion signal synthesis circuit is connected with the input end of the signal conditioning circuit; the signal generation circuit is used for generating a signal to be modulated; the up-conversion signal synthesis circuit comprises a first up-conversion signal synthesis circuit and a second up-conversion signal synthesis circuit; the first up-conversion signal synthesis circuit is used for mixing a signal to be modulated with a low-frequency local oscillation signal to generate a low-frequency radio frequency signal; the second up-conversion signal synthesis circuit is used for mixing a signal to be modulated with a high-frequency local oscillation signal to generate a high-frequency radio frequency signal; the signal conditioning circuit comprises a plurality of signal conditioning channels; the signal conditioning circuit is used for switching the signal conditioning channel to adjust the amplitude of the low-frequency radio frequency signal or the amplitude of the high-frequency radio frequency signal to obtain a target radio frequency signal, and the problem that the amplitude of the wide-frequency radio frequency signal is difficult to adjust with high precision in the related art is solved. The up-conversion signal synthesis circuit is used for processing the signal to be modulated into a low-frequency radio-frequency signal or a high-frequency radio-frequency signal, and the amplitude of the radio-frequency signal is regulated through any signal conditioning channel in the signal conditioning circuit, so that the effects of generating a wide-frequency-band radio-frequency signal and carrying out high-precision regulation on the amplitude of the radio-frequency signal are achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
fig. 1 is a schematic diagram of a signal transmitting device according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an alternative signal emitting device provided in accordance with an embodiment of the present utility model;
FIG. 3 is an initial amplitude-frequency plot of a signal transmitting device provided in accordance with an embodiment of the present utility model;
fig. 4 is a schematic diagram of signal amplitude compensation of a signal transmitting device according to an embodiment of the present utility model;
reference numerals: 10. a signal generating circuit; 20. an up-conversion signal synthesizing circuit; 30. a switch array; 40. a signal conditioning circuit; 50. a signal detection circuit; a1, a first signal attenuator; a2, a second signal attenuator; s1, a first single-pole double-throw switch; s2, a second single-pole double-throw switch; s3, a third single-pole double-throw switch; s4, a fourth single-pole double-throw switch; s5, a fifth single-pole double-throw switch; s6, a sixth single-pole double-throw switch; p1, a third signal amplifier; p2, a first signal amplifier; p3, a second signal amplifier; p4, a fourth signal amplifier; m1, a first mixer; m2, a second mixer; m3, a third mixer; m4, a fourth mixer; Σ1, a first signal processing chip; Σ2, a second signal processing chip; d1, a first digital-to-analog converter; d2, a second digital-to-analog converter; an ADC, analog-to-digital converter; PD, detection circuit.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the utility model herein.
In the field of semiconductor test equipment, there is a scene that an ultra-wideband high dynamic power range and a radio frequency signal with small signal amplitude fluctuation need to be provided for a chip to be tested so as to meet various test requirements of the chip to be tested, and therefore, the embodiment of the utility model provides a signal transmitting device and a tester.
Fig. 1 is a schematic diagram of a signal transmitting apparatus according to an embodiment of the present utility model, as shown in fig. 1, the apparatus includes: the signal generating circuit 10, the up-conversion signal synthesizing circuit 20 and the signal conditioning circuit 40, wherein the input end of the up-conversion signal synthesizing circuit 20 is connected with the signal generating circuit 10 through the first switch array 30, and the output end of the up-conversion signal synthesizing circuit 20 is connected with the input end of the signal conditioning circuit 40.
Wherein the signal generating circuit 10 is used for generating a signal to be modulated. Specifically, the signal generating circuit 10 generates a signal to be modulated if±Δf/2, which is an intermediate frequency signal.
The up-conversion signal synthesizing circuit 20 includes a first up-conversion signal synthesizing circuit and a second up-conversion signal synthesizing circuit; the first up-conversion signal synthesis circuit is used for mixing a signal to be modulated with a low-frequency local oscillation signal to generate a low-frequency radio frequency signal; the second up-conversion signal synthesis circuit is used for mixing the signal to be modulated with the high-frequency local oscillation signal to generate a high-frequency radio frequency signal.
Specifically, the up-conversion signal synthesis circuit 20 is connected to the signal generation circuit 10 through the first switch array 30, when a low intermediate frequency radio frequency signal needs to be generated, the switching action in the first switch array 30 is controlled, the intermediate frequency signal if±Δf/2 is input to the first up-conversion signal synthesis circuit, the first up-conversion signal synthesis circuit is a low intermediate frequency up-conversion circuit, the local oscillation signal of the first up-conversion signal synthesis circuit is a low frequency local oscillation signal, and the first up-conversion signal synthesis circuit mixes the intermediate frequency signal with the low frequency local oscillation signal to obtain the low intermediate frequency radio frequency signal.
Correspondingly, when the medium-high frequency radio frequency signal needs to be generated, the switching action in the first switch array 30 is controlled, the intermediate frequency signal IF+/-Deltaf/2 is input to the second up-conversion signal synthesis circuit, the second up-conversion signal synthesis circuit is a high-intermediate frequency up-conversion circuit, the local oscillation signal of the second up-conversion signal synthesis circuit is a high-frequency local oscillation signal, and the second up-conversion signal synthesis circuit mixes the intermediate frequency signal with the high-frequency local oscillation signal to obtain the medium-high frequency radio frequency signal.
It should be noted that, the amplitude of the intermediate frequency signal is a basic value, in order to meet the requirements of the chip to be tested on radio frequency signals with different amplitudes, the amplitude of the signal can be adjusted by the signal conditioning circuit 40, and the signal conditioning circuit 40 includes a plurality of signal conditioning channels; the signal conditioning circuit 40 is configured to switch the signal conditioning channel to adjust the amplitude of the low-frequency rf signal or the amplitude of the high-frequency rf signal to obtain the target rf signal.
In particular, the different signal conditioning channels of the signal conditioning circuit 40 may comprise different signal amplifiers, different signal attenuators, or a combination of different signal amplifiers and signal attenuators. Because the signal amplitude can be adjusted by different multiples by different signal conditioning channels, a low-frequency radio-frequency signal or a high-frequency radio-frequency signal can be input into different signal conditioning channels in a channel switching mode, and a radio-frequency signal with a low amplitude value in a high power range, a radio-frequency signal with a high amplitude value in a high power range, or a radio-frequency signal with a medium amplitude value in a high power range is output, so that various testing requirements of a chip to be tested are met.
The utility model provides a signal transmitting device, which comprises a signal generating circuit 10, an up-conversion signal synthesizing circuit 20 and a signal conditioning circuit 40, wherein the input end of the up-conversion signal synthesizing circuit 20 is connected with the signal generating circuit 10 through a first switch array 30, and the output end of the up-conversion signal synthesizing circuit 20 is connected with the input end of the signal conditioning circuit 40; wherein the signal generating circuit 10 is used for generating a signal to be modulated; the up-conversion signal synthesizing circuit 20 includes a first up-conversion signal synthesizing circuit and a second up-conversion signal synthesizing circuit; the first up-conversion signal synthesis circuit is used for mixing a signal to be modulated with a low-frequency local oscillation signal to generate a low-frequency radio frequency signal; the second up-conversion signal synthesis circuit is used for mixing a signal to be modulated with a high-frequency local oscillation signal to generate a high-frequency radio frequency signal; the signal conditioning circuit 40 includes a plurality of signal conditioning channels; the signal conditioning circuit 40 is configured to switch the signal conditioning channel to adjust the amplitude of the low-frequency rf signal or the amplitude of the high-frequency rf signal to obtain the target rf signal, thereby solving the problem that it is difficult to adjust the amplitude of the wide-frequency rf signal with high accuracy in the related art. The up-conversion signal synthesis circuit is used for processing the signal to be modulated into a low-frequency radio-frequency signal or a high-frequency radio-frequency signal, and the amplitude of the radio-frequency signal is regulated through any signal conditioning channel in the signal conditioning circuit, so that the effects of generating a wide-frequency-band radio-frequency signal and carrying out high-precision regulation on the amplitude of the radio-frequency signal are achieved.
In order to enable the signal transmitting apparatus to output an IQ signal, optionally, in the signal transmitting apparatus provided in the embodiment of the present utility model, the signal generating circuit 10 includes: the first digital-to-analog converter is used for performing digital-to-analog conversion on the initial digital signal to obtain a first signal to be modulated; the second digital-to-analog converter is used for performing digital-to-analog conversion on the initial digital signal to obtain a second signal to be modulated, wherein the first signal to be modulated and the second signal to be modulated have the same frequency, and the first signal to be modulated and the second signal to be modulated form the signal to be modulated.
Fig. 2 is a schematic diagram of an alternative signal transmitting apparatus according to an embodiment of the present utility model, as shown in fig. 2, the signal generating circuit 10 may include a first digital-to-analog converter D1 and a second digital-to-analog converter D2, and under the condition of having a requirement of outputting IQ signals, the first digital-to-analog converter D1 and the second digital-to-analog converter D2 are adopted to output two paths of signals to be modulated and the second signal to be modulated with the same frequency, that is, an intermediate frequency signal if±Δf/2, where the intermediate frequency signal may be a single-tone signal or a multi-tone signal, and a frequency difference between different signals in the multi-tone signal may reach 500MHz according to practical needs.
Further, the first signal to be modulated and the second signal to be modulated may be processed by an up-conversion signal synthesis circuit to generate IQ signals meeting bandwidth requirements, and optionally, in the signal transmitting apparatus provided in the embodiment of the present utility model, the first up-conversion signal synthesis circuit includes: the first mixer is used for mixing a first signal to be modulated with the low-frequency local oscillation signal to obtain a first mixed signal; the second mixer is used for mixing the second signal to be modulated with the low-frequency local oscillation signal to obtain a second mixed signal; the first signal processing chip is used for carrying out phase quadrature processing on the first mixed signal and the second mixed signal to obtain a low-frequency radio frequency signal; the second up-conversion signal synthesizing circuit includes: the third mixer is used for mixing the first signal to be modulated with the high-frequency local oscillation signal to obtain a third mixed signal; the fourth mixer is used for mixing the second signal to be modulated with the high-frequency local oscillation signal to obtain a fourth mixed signal; and the second signal processing chip is used for carrying out phase quadrature processing on the third mixed signal and the fourth mixed signal to obtain a high-frequency radio frequency signal.
As shown in fig. 2, the first up-conversion signal synthesizing circuit includes a first mixer M1, a second mixer M2, and a first signal processing chip Σ1, and the second up-conversion signal synthesizing circuit includes a third mixer M3, a fourth mixer M4, and a second signal processing chip Σ2.
When the low intermediate frequency radio frequency signal is required to be generated, the switching operation in the first switch array 30 is controlled, the intermediate frequency signal if±Δf/2 is input to the first mixer M1 in the first up-conversion signal synthesis circuit, and the intermediate frequency signal and the low frequency local oscillation signal are mixed to obtain the low intermediate frequency radio frequency signal rfl±Δf/2.
When an IQ modulated signal needs to be output, the first digital-to-analog converter D1 generates an I signal, the second digital-to-analog converter D2 generates a Q signal, the switching operation in the first switch array 30 is controlled, the intermediate frequency signal if±Δf/2 is input to the first mixer M1 and the second mixer M2 in the first up-conversion signal synthesis circuit, the I signal and the Q signal are mixed with the low frequency local oscillation signal in the first mixer M1 and the second mixer M2 respectively, so as to obtain a first mixed signal and a second mixed signal, the first mixed signal and the second mixed signal are input to the first signal processing chip Σ1, and the first signal processing chip Σ1 performs phase quadrature on the first mixed signal and the second mixed signal, so as to generate a low intermediate frequency radio frequency signal rfl±Δf/2.
When the high intermediate frequency radio frequency signal is required to be generated, the switching operation in the first switch array 30 is controlled, the intermediate frequency signal IF±Δf/2 is input to the third mixer M3 in the second up-conversion signal synthesis circuit, and the intermediate frequency signal and the high frequency local oscillation signal are mixed to obtain the high intermediate frequency radio frequency signal Rhl±Δf/2.
When an IQ modulated signal needs to be output, the third digital-to-analog converter D3 generates an I signal, the fourth digital-to-analog converter D4 generates a Q signal, the switching operation in the first switch array 30 is controlled, the intermediate frequency signal if±Δf/2 is input to the third mixer M3 and the fourth mixer M4 in the second up-conversion signal synthesis circuit, the I signal and the Q signal are mixed with the high-frequency local oscillation signal in the third mixer M3 and the fourth mixer M4 respectively, so as to obtain a third mixed signal and a fourth mixed signal, the third mixed signal and the fourth mixed signal are input to the second signal processing chip Σ2, and the second signal processing chip Σ2 performs phase quadrature on the third mixed signal and the fourth mixed signal, so as to generate a high intermediate frequency radio frequency signal rhl±Δf/2.
It should be noted that, the first mixer M1, the second mixer M2, the third mixer M3, and the fourth mixer M4 in this embodiment may select a mixer with a higher frequency range, and one-stage mixing is adopted to implement mixing, so that the cost of the circuit is reduced, and the stability of the circuit is improved.
In order to meet the test requirement of the chip to be tested, optionally, in the signal transmitting device provided by the embodiment of the utility model, the first up-conversion signal synthesis circuit further includes: the third signal amplifier is arranged at the output end of the first signal processing chip and is used for carrying out signal amplification processing on the low-frequency radio frequency signal; and the fourth signal amplifier is arranged at the output end of the second signal processing chip and is used for carrying out signal amplification processing on the high-frequency radio-frequency signal.
As shown in fig. 2, the third signal amplifier is P1, the fourth signal amplifier is P4, the low-frequency radio frequency signal is amplified by the third signal amplifier P1, so that the amplitude of the low-frequency radio frequency signal is increased, and the high-frequency radio frequency signal is amplified by the fourth signal amplifier P4, so that the amplitude of the high-frequency radio frequency signal is increased.
After the third signal amplifier and the fourth amplifier amplify the radio frequency signal, different signal conditioning channels may be formed by different signal attenuators and signal amplifiers, so as to realize flexible adjustment of the amplitude of the radio frequency signal, and optionally, in the signal transmitting device provided by the embodiment of the present utility model, the signal conditioning circuit 40 includes: at least one signal attenuator; at least one signal amplifier; the second switch array comprises a plurality of switches, and a plurality of different signal conditioning channels are formed by controlling the switches of the second switch array to gate signal attenuators with different attenuation factors and/or signal amplifiers with different amplification factors.
Specifically, the different signal conditioning channels may include only a signal attenuator, may include only a signal amplifier, and may further include a combination of a signal attenuator with a different attenuation multiple and a signal amplifier with a different amplification multiple, so that the different signal conditioning channels may amplify or reduce the amplitude of the radio frequency signal with a different multiple. It should be noted that the present embodiment does not limit the number and types of amplifiers and attenuators in the signal conditioning channel.
Optionally, in the signal transmitting device provided by the embodiment of the present utility model, when the number of signal attenuators and signal amplifiers is two, the second switch array includes a first single-pole double-throw switch, a second single-pole double-throw switch, a third single-pole double-throw switch, a fourth single-pole double-throw switch, and a fifth single-pole double-throw switch; the two movable contacts of the first single-pole double-throw switch are respectively connected with the output end of the first up-conversion signal synthesis circuit and the output end of the second up-conversion signal synthesis circuit, the input end of the first signal attenuator is used for being connected with the fixed contact of the first single-pole double-throw switch, the output end of the first signal attenuator is connected with the fixed contact of the second single-pole double-throw switch, the first movable contact of the second single-pole double-throw switch is connected with the input end of the first signal amplifier, the second movable contact of the second single-pole double-throw switch is connected with the second movable contact of the third single-pole double-throw switch through a first through path, the first movable contact of the third single-pole double-throw switch is connected with the output end of the first signal amplifier, the fixed contact of the third single-pole double-throw switch is used for being connected with the input end of the second signal attenuator, the output end of the fourth single-pole double-throw switch is connected with the fixed contact of the fourth single-pole double-throw switch through a second through a first through path, and the second movable contact of the fourth single-pole double-throw switch is connected with the fifth single-pole double-throw switch through a second through path.
As shown in fig. 2, the two signal attenuators are a first signal attenuator A1 and a second signal attenuator A2, the first signal attenuator A1 is connected in parallel with a first through path, the second signal attenuator A2 is connected in parallel with a second through path, the first through path and the second through path may be paths only provided with wires, the two signal amplifiers are a first signal amplifier P2 and a second signal amplifier P3, the first single pole double throw switch is S1, the second single pole double throw switch is S2, the third single pole double throw switch is S3, the fourth single pole double throw switch is S4, and the fifth single pole double throw switch is S5.
When the amplitude of the low-frequency radio-frequency signal is adjusted, the first movable contact and the fixed contact of the first single-pole double-throw switch S1 can be controlled to be communicated, so that the radio-frequency signal output by the first up-conversion signal synthesis circuit is input into the signal conditioning circuit 40, and when the amplitude of the high-frequency radio-frequency signal is adjusted, the second movable contact and the fixed contact of the first single-pole double-throw switch S1 can be controlled to be communicated, so that the radio-frequency signal output by the second up-conversion signal synthesis circuit is input into the signal conditioning circuit 40.
When a radio frequency signal with a low amplitude value in a high power range needs to be output, the second movable contact and the fixed contact of the second single-pole double-throw switch S2 are controlled to be communicated, the second movable contact and the fixed contact of the third single-pole double-throw switch S3 are controlled to be communicated, and the second movable contact and the fixed contact of the fourth single-pole double-throw switch S4 are controlled to be communicated, so that a signal conditioning channel is formed by the first signal attenuator A1, the first straight-through path and the second signal attenuator A2 and the second straight-through path, and signal power attenuation is carried out by the first signal attenuator A1 and the second signal attenuator A2, and the radio frequency signal with the amplitude PL is obtained.
Optionally, in the signal transmitting apparatus provided by the embodiment of the present utility model, the signal amplifier includes a fixed multiple signal amplifier or a programmable gain amplifier, and the signal attenuator includes an adjustable signal attenuator or a fixed multiple signal attenuator. The combination of the signal amplifier and the signal attenuator, and the amplification factor of the signal amplifier and the attenuation factor of the signal attenuator can be adjusted to adjust the multiple of the signal amplitude adjustment so that the radio frequency signal in the high power range required by the test is output.
It should be noted that, when the first signal attenuator A1 and the second signal attenuator A2 are adjustable signal attenuators, when a radio frequency signal with a medium amplitude in a high power range needs to be output, the attenuation function of the first signal attenuator A1 and the second signal attenuator A2 may be turned on to the lowest, and the signal passes through only the through path, so that the signal attenuation is minimized, and a radio frequency signal with a medium amplitude is obtained.
When a radio frequency signal with a high amplitude value in a high power range needs to be output, the first movable contact and the fixed contact of the second single-pole double-throw switch S2 are controlled to be communicated, the first movable contact and the fixed contact of the third single-pole double-throw switch S3 are controlled to be communicated, the first movable contact and the fixed contact of the fourth single-pole double-throw switch S4 are controlled to be communicated, the first signal attenuator A1, the first signal amplifier P2 and the second signal attenuator A2 and the second signal amplifier P3 form a signal conditioning channel, the attenuation amplitude of the first signal attenuator A1 and the second signal attenuator A2 is regulated to be smaller, and the signal power is amplified through the first signal amplifier P2 and the second signal amplifier P3, so that a signal with the amplitude of PH is obtained.
The control instruction for adjusting the switching action of the second switch array and the control instruction for adjusting the amplifier and the attenuator are sent by the upper computer, and the amplification factor of the amplifier and the attenuation factor of the attenuator are determined by the conduction state of the second switch array in the signal conditioning circuit controlled by the signal generator.
It should be noted that, because of the inherent physical attenuation of the device and the microstrip line in the signal transmitting apparatus, the frequency response characteristic of the radio frequency device is more obvious as the frequency is wider. Fig. 3 is an initial amplitude-frequency graph of the signal transmitting apparatus according to the embodiment of the present utility model, as shown in fig. 3, if the power output by the radio frequency signal at all frequency points is the same, the port of the signal conditioning circuit 40 presents a link frequency response characteristic as shown in fig. 3, the output power of the high frequency part is relatively low, the output power of the low frequency part is relatively high, the output amplitudes of any two frequency points are different for a single tone signal, and the in-band output amplitudes of any Δf are different for a multi-tone signal (i.e., a wideband signal).
Because the output amplitude consistency and the accuracy requirements of the chip to be tested on each frequency point are very high, in order to reduce the influence of the frequency response characteristic on the output radio frequency signal, the amplitude-frequency characteristic information needs to be detected, and optionally, in the signal transmitting device provided by the embodiment of the utility model, the signal transmitting device further comprises: the signal detection circuit 50 is connected to the output end of the signal conditioning circuit 40, and is used for detecting the amplitude-frequency characteristic information of the target radio frequency signal.
Optionally, in the signal transmitting apparatus provided in the embodiment of the present utility model, the signal detecting circuit 50 includes: the detection circuit is connected with the output end of the signal conditioning circuit and is used for detecting the power of the target radio frequency signal output by the signal conditioning circuit to obtain a voltage signal; and the analog-to-digital converter is connected with the detection circuit and is used for performing analog-to-digital conversion on the voltage signal to obtain amplitude-frequency characteristic information.
As shown in fig. 2, the output ports of the signal conditioning circuit 40 may include a first output Port and a second output Port, where the first output Port is a Port in fig. 2, the radio frequency signal output by the Port is transmitted to the chip to be tested, a sixth single pole double throw switch S6 is disposed between the signal conditioning channel and the first output Port and between the signal conditioning channel and the second output Port, and the output signal of the signal conditioning channel can be transmitted to the first output Port or the second output Port by controlling the sixth single pole double throw switch S6, where the output power of the two ports is similar, and the output power of the Port is monitored at the second Port of the signal conditioning circuit 40.
Specifically, the detection circuit is denoted by PD in fig. 2, the analog-to-digital converter is denoted by ADC in fig. 2, the radio frequency information output from the second port of the signal conditioning circuit 40 is detected by the detection circuit PD, a dc voltage is output, and the dc voltage is converted by the analog-to-digital converter ADC, so that the amplitude-frequency characteristic of the radio frequency signal is monitored.
After detecting the amplitude-frequency characteristic of the radio frequency signal, the amplitude compensation may be performed on the output signal of the signal conditioning circuit 40 according to the amplitude-frequency characteristic, and optionally, in the signal transmitting apparatus provided in the embodiment of the present utility model, the signal generating circuit 10 includes: a signal generator, the signal generator comprising: the data buffer is connected with the signal detection circuit and used for storing a waveform file, wherein the waveform file is used for generating a digital signal to be compensated; and the digital filter is used for adjusting the amplitude of the digital signal to be compensated at different frequency points according to the amplitude compensation signal to obtain a digital compensation signal, wherein the amplitude compensation signal is an amplitude compensation signal matched with the amplitude-frequency characteristic information of the target radio frequency signal.
It should be noted that the signal generator includes, but is not limited to, an FPGA (Field Programmable Gate Array ), and the FPGA may perform inverse direction amplitude compensation on the output signal in the FPGA through a digital intermediate frequency amplitude compensation manner according to the amplitude-frequency characteristic of the Port. Specifically, the signal generator includes a data buffer and a digital filter, where the data buffer may be a FIFO (First In/First Out) buffer, and may store a waveform file In advance, or may receive a waveform file sent by the host computer. The digital filter may be an FIR filter (Finite Impulse Response filter, finite length unit impulse response filter) through which digital intermediate frequency amplitude compensation is achieved.
Specifically, after an initial amplitude-frequency curve is obtained, firstly, calculating to obtain the amplitude of each frequency point of the FIR digital filter according to an ideal amplitude-frequency curve and the initial amplitude-frequency curve, namely, the amplitude-frequency response H (k) of the FIR digital filter, and then carrying out IDFT (inverse discrete Fourier transform) on the amplitude-frequency response H (k) of the FIR digital filter to obtain the unit impulse response H (n) of the FIR filter, wherein the coefficient of H (n) can be subjected to parameterization configuration through an FPGA (field programmable gate array). After parameter configuration, the digital signal generated in the FPGA is subjected to amplitude attenuation by a filter, and fig. 4 is a schematic diagram of signal amplitude compensation of the signal transmitting device according to the embodiment of the present utility model, as shown in fig. 4, where the power of the output signal is kept consistent at each frequency point.
In an alternative embodiment, taking the application of zero intermediate frequency (the frequency of the local oscillation signal is consistent with the center frequency of the radio frequency signal) as an example, the range of the radio frequency broadband signal is FL+Deltaf/2-FL-Deltaf/2, and the fluctuation of Deltaf within 1dB is controlled as an amplitude adjustment target. Firstly, 5 frequency points in a broadband signal are selected, wherein the frequency points are f1, f2, f3, f4 and f5 respectively, the five frequency points can be divided evenly, the frequency intervals are the same, the amplitudes of the 5 frequency points are monitored through a detection circuit and are a1, a2, a3, a4 and a5 respectively, the amplitudes a1 > a2 > a3 > a4 > a5 are arranged and combined according to the amplitude, an initial amplitude-frequency curve is obtained by arranging, under the condition that the amplitude a1 > a2 > a3 > a5 is assumed, the amplitude is the lowest value a5 is usually selected as a reference value, the amplitudes of other frequency points are compared with the reference value to obtain 4 amplitude differences of the other frequency points and f5, the 4 amplitude differences are used as attenuation values of corresponding frequency points to obtain a compensation amplitude-frequency curve, and the amplitude curve is compensated by changing the program variable of the FIR digital filter, so that a1 is approximately equal to a2 approximately a3 approximately equal to a5, and an ideal amplitude curve is output. It should be noted that, for the ultra wideband signal, the wideband signal may be divided into more frequency points, so as to improve the adjustment accuracy, so as to ensure that the adjusted amplitude-frequency curve is more ideal.
According to the embodiment, the digital intermediate frequency amplitude compensation is realized by adopting the FIR digital filter, the FIR digital filter can be realized in the FPGA through programming, different filters can be designed by changing a program or changing a program variable, the FIR digital filter can attenuate the amplitude of different frequency points, the attenuation value is adjustable, the precision is high, and the amplitude equalization is realized with low cost and high precision.
In another embodiment of the present application, a testing machine is provided, including a signal transmitting device as described above, where the signal transmitting device is integrated on a PCB board.
The foregoing is merely exemplary of the present utility model and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are to be included in the scope of the claims of the present utility model.
Claims (10)
1. A signal transmitting apparatus, comprising: the input end of the up-conversion signal synthesis circuit is connected with the signal generation circuit through a first switch array, and the output end of the up-conversion signal synthesis circuit is connected with the input end of the signal conditioning circuit;
the signal generation circuit is used for generating a signal to be modulated;
the up-conversion signal synthesis circuit comprises a first up-conversion signal synthesis circuit and a second up-conversion signal synthesis circuit; the first up-conversion signal synthesis circuit is used for mixing the signal to be modulated with a low-frequency local oscillation signal to generate a low-frequency radio frequency signal; the second up-conversion signal synthesis circuit is used for mixing the signal to be modulated with a high-frequency local oscillation signal to generate a high-frequency radio frequency signal;
the signal conditioning circuit comprises a plurality of signal conditioning channels; the signal conditioning circuit is used for switching the signal conditioning channel so as to adjust the amplitude of the low-frequency radio-frequency signal or the amplitude of the high-frequency radio-frequency signal to obtain a target radio-frequency signal.
2. The signal transmitting apparatus of claim 1, further comprising:
and the signal detection circuit is connected with the output end of the signal conditioning circuit and is used for detecting the amplitude-frequency characteristic information of the target radio frequency signal.
3. The signal transmitting apparatus of claim 2, wherein the signal detection circuit comprises:
the detection circuit is connected with the output end of the signal conditioning circuit and is used for detecting the power of the target radio frequency signal output by the signal conditioning circuit to obtain a voltage signal;
and the analog-to-digital converter is connected with the detection circuit and is used for performing analog-to-digital conversion on the voltage signal to obtain the amplitude-frequency characteristic information.
4. The signal transmitting apparatus of claim 2, wherein the signal generating circuit comprises a signal generator comprising:
the data buffer is connected with the signal detection circuit and used for storing a waveform file, wherein the waveform file is used for generating a digital signal to be compensated;
and the digital filter is used for adjusting the amplitude of the digital signal to be compensated at different frequency points according to the amplitude compensation signal to obtain a digital compensation signal, wherein the amplitude compensation signal is an amplitude compensation signal matched with the amplitude-frequency characteristic information of the target radio frequency signal.
5. The signal transmitting apparatus of claim 2, wherein the signal conditioning circuit comprises:
at least one signal attenuator;
at least one signal amplifier;
and the second switch array comprises a plurality of switches, and the signal attenuators with different attenuation factors and/or the signal amplifiers with different amplification factors are/is controlled by the switches of the second switch array to form a plurality of signal conditioning channels.
6. The signal transmitting apparatus of claim 5, wherein the second switch array comprises a first single pole double throw switch, a second single pole double throw switch, a third single pole double throw switch, a fourth single pole double throw switch, a fifth single pole double throw switch, in the case where the number of signal attenuators and signal amplifiers are two; wherein,
the two movable contacts of the first single-pole double-throw switch are respectively connected with the output end of the first up-conversion signal synthesis circuit and the output end of the second up-conversion signal synthesis circuit, the input end of the first single-pole double-throw switch is used for being connected with the stationary contact of the first single-pole double-throw switch, the output end of the first single-pole double-throw switch is connected with the stationary contact of the second single-pole double-throw switch, the first movable contact of the second single-pole double-throw switch is connected with the input end of the first single-pole double-throw switch, the second movable contact of the second single-pole double-throw switch is connected with the second movable contact of the third single-pole double-throw switch through a first straight-through path, the first movable contact of the third single-pole double-throw switch is connected with the output end of the first single-pole double-throw switch, the stationary contact of the third single-pole double-throw switch is used for being connected with the input end of the second single-pole double-throw switch, the output end of the second single-pole double-throw switch is connected with the fifth single-throw switch through a fifth single-pole double-throw switch, and the fifth single-throw switch is connected with the fifth single-pole double-throw switch input end.
7. The signal transmitting apparatus of claim 2, wherein the signal generating circuit further comprises:
the first digital-to-analog converter is used for performing digital-to-analog conversion on the initial digital signal to obtain a first signal to be modulated;
the second digital-to-analog converter is used for performing digital-to-analog conversion on the initial digital signal to obtain a second signal to be modulated, wherein the frequencies of the first signal to be modulated and the second signal to be modulated are the same, and the first signal to be modulated and the second signal to be modulated form the signal to be modulated.
8. The signal transmitting apparatus of claim 7, wherein the first up-conversion signal synthesizing circuit comprises:
the first mixer is used for mixing the first signal to be modulated with the low-frequency local oscillation signal to obtain a first mixed signal;
the second mixer is used for mixing the second signal to be modulated with the low-frequency local oscillation signal to obtain a second mixed signal;
the first signal processing chip is used for carrying out phase quadrature processing on the first mixed signal and the second mixed signal to obtain the low-frequency radio frequency signal;
the second up-conversion signal synthesizing circuit includes:
the third mixer is used for mixing the first signal to be modulated with the high-frequency local oscillation signal to obtain a third mixed signal;
the fourth mixer is used for mixing the second signal to be modulated with the high-frequency local oscillation signal to obtain a fourth mixed signal;
and the second signal processing chip is used for carrying out phase quadrature processing on the third mixed signal and the fourth mixed signal to obtain the high-frequency radio-frequency signal.
9. The signal transmitting apparatus of claim 8, wherein the first up-conversion signal synthesizing circuit further comprises:
the third signal amplifier is arranged at the output end of the first signal processing chip and is used for carrying out signal amplification processing on the low-frequency radio-frequency signal;
and the fourth signal amplifier is arranged at the output end of the second signal processing chip and is used for carrying out signal amplification processing on the high-frequency radio-frequency signal.
10. A testing machine comprising a signal emitting device according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320753068.1U CN220210431U (en) | 2023-03-31 | 2023-03-31 | Signal transmitting device and testing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320753068.1U CN220210431U (en) | 2023-03-31 | 2023-03-31 | Signal transmitting device and testing machine |
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| CN220210431U true CN220210431U (en) | 2023-12-19 |
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| CN202320753068.1U Active CN220210431U (en) | 2023-03-31 | 2023-03-31 | Signal transmitting device and testing machine |
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