CN202748411U

CN202748411U - Multipath clock tester

Info

Publication number: CN202748411U
Application number: CN 201220290074
Authority: CN
Inventors: 任智仁; 黄杰; 周弼; 张亮; 周宣
Original assignee: ZHUHAI ZHONGHUI MICROELECTRONICS CO Ltd
Current assignee: ZHUHAI ZHONGHUI MICROELECTRONICS CO Ltd
Priority date: 2012-06-17
Filing date: 2012-06-17
Publication date: 2013-02-20
Anticipated expiration: 2022-06-17

Abstract

The utility model discloses a multipath clock tester characterized in that: the multipath clock tester comprises a power supply circuit, a constant-temperature crystal, a multipath clock conditioning circuit, a FPGA measuring chip, a master control MCU, a temperature sensor, a keying circuit, a display unit, and a communication interface; the constant-temperature crystal provides the FPGA measuring chip with standard clock source signals; the multipath clock conditioning circuit inputs tested clock signals into the FPGA measuring chip; the FPGA measuring chip is connected with the master control MCU; the temperature sensor, the keying circuit, the display unit, and the communication interface are respectively connected with the master control MCU; and the power supply circuit provides each part with working power supply. The multipath clock tester provided by the utility model provides a powerful equipment guarantee for high-precision detection and calibration of multipath clocks. The multipath clock tester greatly improves the efficiency of detection and calibration of the clocks in batches and solves the technical bottleneck in the modernized large-scale production.

Description

The multipath clock tester

Technical field

The utility model relates to the electronic circuit technology field, is specifically related to a kind of multipath clock tester.

Background technology

Present clock test instrument on the market all only supports the single channel clock to measure, under the prerequisite that guarantees high-acruracy survey, can't measure synchronously, in real time multipath clock, this defective is so that the user once can only detect, calibrate one road clocking error, efficient is very low, can not satisfy the needs of modernized large-scale production, a kind of instrument that can check accurately, calibrate multipath clock of market in urgent need.

The utility model content

The purpose of this utility model is to provide a kind of instrument that can check accurately, calibrate multipath clock.

Above-mentioned purpose is realized by following technical scheme:

A kind of multipath clock tester, it is characterized in that: comprise that power circuit, constant temperature crystal, multipath clock modulate circuit, FPGA measure chip, main control MCU, temperature sensor, key circuit, display unit and communication interface, constant temperature crystal provides the standard time clock source signal for fpga chip, the multipath clock modulate circuit is that FPGA measures chip input measured clock signal, FPGA measures chip and links to each other with main control MCU, temperature sensor, key circuit, display unit and communication interface are connected with main control MCU respectively, and power circuit provides working power for each several part.

Described constant temperature crystal is the high frequency constant temperature crystal that precision is higher than 0.1PPM.

Described multipath clock modulate circuit has 20 four road measured clock signal input channels.

Described temperature sensor is that resolution reaches 0.0625 ℃ thermometric chip.

Described main control MCU is 16 MCU.

Described FPGA measures chip and links to each other by spi bus with main control MCU, and described temperature sensor links to each other by the I2C bus with main control MCU.

Described communication interface comprises one of RS485 interface and RS232 interface or both.

In the multipath clock tester that the utility model provides: FPGA measures chip can be to nearly 24 road clock signal synchronizations, in real time measurement, and measurement result is transferred to main control MCU by spi bus; Temperature sensor is measures ambient temperature in real time, and measurement result to main control MCU, is accurately demarcated temperature for calibrating clock signal by the I2C bus transfer; Main control MCU can be according to the parameter of user's setting, clocking error and the environment temperature that measures is for further processing, then result is delivered on the display unit and shown in real time, perhaps be transferred to PC by communication interface unit, record, check, calibrate clocking error by the PC daemon software.This multipath clock tester that the utility model provides provides strong equipment guarantee for detecting accurately, calibrate multipath clock, has greatly improved the in batches efficient of clock of detection, calibration, has solved the technical bottleneck of modernized large-scale production.

Description of drawings

Fig. 1 is schematic block circuit diagram of the present utility model.

Below in conjunction with accompanying drawing and embodiment the utility model is done and to be described in further detail.

Embodiment

As shown in Figure 1, the multipath clock tester that provides of present embodiment comprises: 24 road clock modulate circuits, constant temperature crystal, FPGA measure chip, main control MCU, temperature sensor, LCD display circuit, key circuit and communication interface.Wherein, the high frequency constant temperature crystal that precision is higher than 0.1PPM is standard clock source, supports at a high speed, the FPGA of hardware parallel processing is for measuring chip, and it is the thermometric chip that resolution reaches 0.0625 ℃ temperature sensor, and 16 high-performance MCU are main control MCU.

Front end 24 road clock modulate circuits carry out shaping, filtering to the clock signal of input to be processed, and then exports to FPGA and measures chip, and FPGA measures chip and measures synchronously, in real time 24 road clock input channels, notifies main control MCU after measuring clocking error; Main control MCU reads this clocking error by spi bus, do further computing according to user's parameters again, at last operation result is delivered to the upper in real time demonstration of LCD, also can be transferred to PC by RS485 or RS232, record, check, calibrate each clocking error by the PC daemon software; The real-time measures ambient temperature of high precision measuring temperature chip of instrument employing is calibration cycle accurate terrestrial reference fixed temperature in addition.

Power circuit among Fig. 1 is divided into power circuit, the RS485/RS232 communication power supply circuit of power circuit, main control MCU and the relevant portion of constant temperature crystal power circuit, FPGA and relevant portion, and they are all obtained through processing such as rectification, filtering, conversion by Switching Power Supply; LCD display circuit among Fig. 1 can show the running parameter of error amount, current environmental temperature and the instrument of each passage; Key circuit among Fig. 1 can inquire about each passage error amount, the running parameter of instrument is set; Communication interface among Fig. 1 comprises RS485 and RS232, is used for finishing PC and setting parameter, the clocking error of instrument read with environment temperature reads.

Claims

1. multipath clock tester, it is characterized in that: comprise that power circuit, constant temperature crystal, multipath clock modulate circuit, FPGA measure chip, main control MCU, temperature sensor, key circuit, display unit and communication interface, constant temperature crystal provides the standard time clock source signal for fpga chip, the multipath clock modulate circuit is that FPGA measures chip input measured clock signal, FPGA measures chip and links to each other with main control MCU, temperature sensor, key circuit, display unit and communication interface are connected with main control MCU respectively, and power circuit provides working power for each several part.

2. multipath clock tester according to claim 1, it is characterized in that: described constant temperature crystal is the high frequency constant temperature crystal that precision is higher than 0.1PPM.

3. multipath clock tester according to claim 1, it is characterized in that: described multipath clock modulate circuit has 20 four road measured clock signal input channels.

4. multipath clock tester according to claim 1, it is characterized in that: described temperature sensor is that resolution reaches 0.0625 ℃ thermometric chip.

5. multipath clock tester according to claim 1, it is characterized in that: described main control MCU is 16 MCU.

6. multipath clock tester according to claim 1 is characterized in that: described FPGA measures chip and links to each other by spi bus with main control MCU, and described temperature sensor links to each other by the I2C bus with main control MCU.

7. multipath clock tester according to claim 1 is characterized in that: described communication interface comprises one of RS485 interface and RS232 interface or both.