CN103368667A - PXI bus structure-based radio frequency test unit - Google Patents

Abstract

A PXI bus structure-based radio frequency test unit mainly comprises an embedded image control processor S3C2440, a PXI bus, 6 grades of coaxial switches, a first high-pass filter, a second high-pass filter, a low-pass filter, a first wave trap, a second wave trap, a third wave trap, a first magnifier and a second magnifier. The PXI bus structure-based radio frequency test unit solves the problem that different test projects need different signal processing paths in the test process of the radio frequency terminal equipment, can perform system integrating on all test links of approved radiation disturbance and radiation stray indexes, avoids the error brought by the manual test and is capable of improving the test accuracy and test efficiency.

Description

Radio frequency testing unit based on the PXI bus architecture

Technical field

The invention belongs to electronic technology/communications field, relate to a kind of radio frequency testing unit based on the PXI bus architecture, be used for checking and approving the switch unit of radiation disturbance and radiation dispersion test macro, be applied to especially check and approve building of the test of radiation dispersion wireless terminal radio-frequency (RF) index and integrated test system.

Background technology

Conventional terminal radio frequency Auto-Test System refers to adopt computer control, automatically finish the automatization test system of setting up conversation, link switching, signal measurement, data computing and outputing test result, be mainly used in the test of wireless terminal radio-frequency (RF) index and integrated test system and build, comprise that radio-frequency (RF) index test and the Auto-Test System of the wireless terminals such as TD-SCDMA, GSM, WLAN, WCDMA, CDMA and bluetooth built;

The radio frequency testing unit of prior art is mainly by external minority manufacturer production, production cycle is long, and limited degree is large, expensive, and test cell can not manually be controlled separately, be difficult to be applied to flexibly different test environments, the main test instrumentation that uses the advanced person of present stage terminal radio frequency test, but in to rf terminal testing equipment process, for different test events, need to carry corresponding radio frequency link to satisfy test request, in finishing a radio frequency testing process, need many radio frequency links to carry simultaneously;

Existing radio frequency testing unit mainly uses advanced test instrumentation, but in to rf terminal testing equipment process, for different test events and standard, need to carry corresponding radio frequency link to satisfy test request, in finishing a radio frequency testing process, need many radio frequency links to carry simultaneously.If manually carry test link, can introduce measure error, affect the accuracy of test result.

PXI is a kind of brand-new opening, modular instrument bus specification, possesses many-sided professionalisms such as machinery, electric and software, and the PXI bus is 32-bit, and 33MHz bus, peak-peak transmission rate are 132MB/s.

The software standard of PXI is the same with other bus architecture, can allow different manufacturers jointly operate on the hardware interface level, and different from other bus specifications is also to have stipulated software requirement except the electric requirement of regulation bus, makes integrated convenient.The PXI software architecture is by standard operation system, instrument drive system and standard application software.

Since the PXI bussing technique is born, the characteristics of PXI bus high bandwidth, low delay are very suitable for setting up Auto-Test System, the PXI bus is a kind of extend type of pci bus, it provides synchronous, the Timing characteristics that high precision instrument just has on other expensive test platforms with extremely low price, satisfies the requirements at the higher level of concurrent testing.

Summary of the invention

Technology of the present invention is dealt with problems and is: overcome the deficiency of existing control technology, the radio frequency testing unit that is used for checking and approving EMC emission test that provides a kind of radio frequency testing unit based on the PXI bus architecture, coaxial switch, filter, amplifier and trapper to form.

Technical solution of the present invention is: a kind of radio frequency testing unit based on the PXI bus architecture, mainly comprise a digital control processor S3C2440, the peak-peak transmission rate is the 32-bit of 132MB/s, 33MHz PXI bus, 6 grades of coaxial switches, the first high pass filter, the second high pass filter, low pass filter, the first trapper, the second trapper, the 3rd trapper, the first amplifier and the second amplifier form, wherein, digital processing unit S3C2440 is used for turning on and off of 6 grades of coaxial switches of control by the PXI bus, tested signal is by first order coaxial switch and the first high pass filter, the second high pass filter and low pass filter link to each other, filtered signal links to each other with trapper with third level coaxial switch by the second level again, signal behind the trap is by fourth stage coaxial switch and level V coaxial switch and the first amplifier, the second amplifier links to each other, and links to each other with terminal by the 6th grade of coaxial switch at last;

Described the first high pass filter is the 1.6GHz high pass filter, mainly finishes the following signal of 1.60GHz is carried out filtering, keeps the above signal of 1.60GHz and passes through smoothly test link; The second high pass filter is that the 2.4GHz high pass filter is mainly finished the following signal of 2.40GHz is carried out filtering, keeps the above signal of 2.40GHz and passes through smoothly test link; Low pass filter is the 800MHz low pass filter, mainly finishes the above signal of 800MHz is carried out filtering, keeps the following signal of 800MHz and passes through smoothly test link;

Wherein the first trapper adopts the TD2010-2025MHz trapper, in order to eliminate the main signal in the TD2010-2025MHz frequency range, then other signals is sent into amplifier module, and signal is amplified; The second trapper adopts the TD1880-1900MHz trapper, in order to eliminate the main signal in the TD1880-1900MHz frequency range, then other signals is sent into amplifier module, and signal is amplified; The 3rd trapper adopts the TD1880-1920MHz trapper, in order to eliminate the main signal in the TD1880-1920MHz frequency range, is sent into amplifier module by the tested signal behind the trap, and signal is amplified.

Described the first amplifier is 6.0-18.0GHz, and 34dB amplifier 10S6G18A or 20S6G18, the second amplifier are 0.1-6.0GHz, 27dB amplifier GNA-589.

The present invention's advantage compared with prior art is:

Radio frequency testing unit based on the PXI bus architecture of the present invention, adopted the PXI bus, overcome in rf terminal testing equipment process, different test events need unlike signal to process the problem in path, the test link that all can be checked and approved radiation disturbance and radiation dispersion index carries out the system integration, the error of having avoided manual test to bring has improved test accuracy and testing efficiency; Reduce simultaneously volume, the quality of system, accelerated data transmission bauds, compatible good, portable strong.

Description of drawings

Fig. 1 is the radio frequency testing unit based on the PXI bus architecture.

Embodiment

A kind of radio frequency testing unit based on the PXI bus architecture, as shown in Figure 1, mainly comprise a digital control processor S3C2440, the peak-peak transmission rate is the 32-bit of 132MB/s, 33MHz PXI bus, 6 grades of coaxial switches, the first high pass filter, the second high pass filter, low pass filter, the first trapper, the second trapper, the 3rd trapper, the first amplifier and the second amplifier form, wherein, digital processing unit S3C2440 is used for turning on and off of 6 grades of coaxial switches of control by the PXI bus, tested signal is by first order coaxial switch and the first high pass filter, the second high pass filter and low pass filter link to each other, filtered signal links to each other with trapper with third level coaxial switch by the second level again, signal behind the trap is by fourth stage coaxial switch and level V coaxial switch and the first amplifier, the second amplifier links to each other, and links to each other with terminal by the 6th grade of coaxial switch at last; The hardware resource configuration of digital processing unit S3C2440 is as follows:

●CPU

Samsung S3C2440AL-40 adopts the ARM920T kernel

Dominant frequency: dominant frequency 400MHz, the highest 533MHz

●SDRAM

At plate 64M SDRAM

The 32bit data/address bus

The SDRAM clock frequency is up to 100MHz

●Flash?Memory

64M Flash, power down is non-volatile

2M Flash, power down is non-volatile

● interface

1 100M network RJ-45 interface adopts the DM9000 network card chip;

3 TTL serial interfaces, they have all made the RS232 level conversion;

4 USB Host (using USB 1.1 agreements);

1 USB Slave (using USB 1.1 agreements);

The standard audio input/output interface;

1 PWM control buzzer;

4 user LED;

1 adjustable resistance meets AD0, and 1, be used for the AD conversion testing;

6 user key-press may be defined as upper and lower, left and right, TAB, "enter" key" at WinCE or Linux, and 6 buttons can be drawn use by row-needle receptacle;

1 standard SD deck;

1 LCD interface block is 40Pin 0.5mm spacing paster interface;

1 CMOS utilizing camera interface is 20Pin 2.0mm spacing contact pin;

10 pin 2.0mm spacing jtag interfaces;

The RTC reserce cell;

1 power supply input port ,+5V power supply;

6 layers of PCB (4 layer signals, 2 layers of power supply and ground connection) circuit;

Power consumption: the S3C2440AL-40 chip power-consumption is 2～3W, and whole hardware system power consumption is 20W, maximum power dissipation 25W.

The software of radio frequency testing unit comprises bootloader (u-boot), general wince system and related file system.U-boot and wince kernel leave in the Flash memory on the mainboard, and file system is installed in the FLASH the inside on the S3C2440 in advance, and after powering on, the wince system just can move.

The filter that this radio frequency testing unit uses mainly forms (low pass filter) by 1.6GHz high pass filter (the first high pass filter), 2.40GHz high pass filter (the second high pass filter) and 800MHz low pass filter and forms;

Wherein the first high pass filter is the 1.6GHz high pass filter, mainly finishes the following signal of 1.60GHz is carried out filtering, keeps the above signal of 1.60GHz and passes through smoothly test link; The second high pass filter is that the 2.4GHz high pass filter is mainly finished the following signal of 2.40GHz is carried out filtering, keeps the above signal of 2.40GHz and passes through smoothly test link; Low pass filter is the 800MHz low pass filter, mainly finishes the above signal of 800MHz is carried out filtering, keeps the following signal of 800MHz and passes through smoothly test link.

Tested signal enters the trapper module after by bank of filters, the main signal of filtering equipment under test, because do not need to test main signal during test, and the main signal of equipment just is included within the working frequency range of trapper.The trapper that this radio frequency testing unit uses mainly is comprised of TD2010-2025MHz trapper (the first trapper), TD1880-1900MHz trapper (the second trapper) and TD1880-1920MHz trapper (the 3rd trapper);

Wherein the first trapper adopts the TD2010-2025MHz trapper, in order to eliminate the main signal in the TD2010-2025MHz frequency range, then other signals is sent into amplifier module, and signal is amplified; The second trapper adopts the TD1880-1900MHz trapper, in order to eliminate the main signal in the TD1880-1900MHz frequency range, then other signals is sent into amplifier module, and signal is amplified; The 3rd trapper adopts the TD1880-1920MHz trapper, in order to eliminate the main signal in the TD1880-1920MHz frequency range, is sent into amplifier module by the tested signal behind the trap, and signal is amplified.

Tested signal through filter, trapper after, enter amplifier module signal effectively amplified, then by power limiting device protection customer meter, avoid because of overheated radio-frequency power, direct current is instantaneous and static discharge (ESD) is damaged.The amplifier that this radio frequency switching matrix system uses is mainly by 6.0-18.0GHz, 34dB amplifier and 0.1-6.0GHz, and the 27dB amplifier forms:

The Software for Design of amplifier is comprised of two parts:

(1) 6.0-18.0GHz, 34dB amplifier 10S6G18A (power output 9W) or 20S6G18 (power output 18W)

Measured signal enters amplifier module the signal in this frequency range is effectively amplified after passing through filter, trapper, sends into test instrumentation behind the letter after will amplifying.

(2) 0.1-6.0GHz, 27dB amplifier GNA-589 (power output 18W)

Measured signal enters amplifier module the signal in this frequency range is effectively amplified after passing through filter, trapper, sends into test instrumentation behind the letter after will amplifying.

The content that is not described in detail in the specification of the present invention belongs to the known prior art of this area professional and technical personnel.

Claims (1)

1. radio frequency testing unit based on the PXI bus architecture, it is characterized in that: mainly comprise a digital control processor S3C2440, the peak-peak transmission rate is the 32-bit of 132MB/s, the 33MHzPXI bus, 6 grades of coaxial switches, the first high pass filter, the second high pass filter, low pass filter, the first trapper, the second trapper, the 3rd trapper, the first amplifier and the second amplifier form, wherein, digital processing unit S3C2440 is used for turning on and off of 6 grades of coaxial switches of control by the PXI bus, tested signal is by first order coaxial switch and the first high pass filter, the second high pass filter and low pass filter link to each other, filtered signal links to each other with trapper with third level coaxial switch by the second level again, signal behind the trap is by fourth stage coaxial switch and level V coaxial switch and the first amplifier, the second amplifier links to each other, and links to each other with terminal by the 6th grade of coaxial switch at last;

Described the first high pass filter is the 1.6GHz high pass filter, mainly finishes the following signal of 1.60GHz is carried out filtering, keeps the above signal of 1.60GHz and passes through smoothly test link; The second high pass filter is that the 2.4GHz high pass filter is mainly finished the following signal of 2.40GHz is carried out filtering, keeps the above signal of 2.40GHz and passes through smoothly test link; Low pass filter is the 800MHz low pass filter, mainly finishes the above signal of 800MHz is carried out filtering, keeps the following signal of 800MHz and passes through smoothly test link;

Wherein the first trapper adopts the TD2010-2025MHz trapper, in order to eliminate the main signal in the TD2010-2025MHz frequency range, then other signals is sent into amplifier module, and signal is amplified; The second trapper adopts the TD1880-1900MHz trapper, in order to eliminate the main signal in the TD1880-1900MHz frequency range, then other signals is sent into amplifier module, and signal is amplified; The 3rd trapper adopts the TD1880-1920MHz trapper, in order to eliminate the main signal in the TD1880-1920MHz frequency range, is sent into amplifier module by the tested signal behind the trap, and signal is amplified.

Described the first amplifier is 6.0-18.0GHz, and 34dB amplifier 10S6G18A or 20S6G18, the second amplifier are 0.1-6.0GHz, 27dB amplifier GNA-589.

Images