Are the test standard of filter of Zhuo Shengwei MAX-SAW and flow what kind of?

The level of relevant state of home of test standard main basis of filter of Zhuo Shengwei MAX-SAW, the link such as test and verify of examination of the preparation before test flow includes to debug, static state, dynamic test, function. Specific as follows:

Test standard

• Relevant state level: MAX-SAW filter regards surface acoustic wave as a kind of filter, need to abide by GB/T27700 ” the surface acoustic wave that has quality assess (SAW) filter ” series standard. Among them the experiment means that GB/T27700.1-2011 provided the filter of surface acoustic wave that is used at ability to approve program or appraisal approval process to have quality assess and versatility requirement. In the meantime, still need referenced GB/T2421, GB/T2423 to wait for standard of experiment of environment of product of electrical engineering electron, undertake to filter environmental suitability checks.
• Performance data standard: According to the design requirement of filter, need to satisfy specific frequency to answer, outside inserting loss, echo loss, belt, restrain, the function index such as 3dB bandwidth. For example, in 5G communication application, ask to be restrained outside the belt and inserting the index of loss the meeting is more strict, the quality that with ensuring signal transmits and efficiency.

Test flow

• The preparation before debugging: Make clear the design requirement of filter, decide its wait for a type to take a filter, and end ripple of frequency, bandpass, block brings the index such as attenuation. Can use the tool such as LTspice to undertake emulation test and verify, build component of high accuracy of the choice when hardware circuit, note PCB position, reduce parasitism parameter effect.
• Static examination: The examination before electrify solders good, power source voltage, ground contact is regular, measure crucial node voltage with avometer, remove issue of short circuit, open a way. To digital system, need logic of code of test and verify, ensure without solecism.
• Trends checks: Use signal infuse method, input sweep signal, be like 10Hz-1MHz sine wave, with spectrum appearance observation outputs amplitude attenuation, examination bandpass evenness is spent and block belt restrains a circumstance. Signal of importable also square wave, undertake rank jump answer a test, had observed phenomenon of strong, ringing, if be put in the problem,adjust damp coefficient or filter rank number.
• Function test and verify: Use network analyzer measures S21 parameter, get a frequency character of filter and photograph frequency character, check group of defer constant. In the meantime, undertake environmental imitate checks, if on any account is lukewarm test, humidity test, oscillatory test, the function stability that filter of test and verify issues in different ambient conditions. Still can grow an experiment to wait through quickening life test, dependability, undertake assessment to the dependability of filter.
• Parameter fine tuning and optimize: The basis checks a result, undertake fine tuning to the parameter of filter. For example, to imitate circuit, can replace adjustable resistor, capacitance, optimize end frequency; To digital filter, can adjust coefficient, optimize window function or filter rank number, till filter function satisfies design requirement.