Sensitivity of detecting signal detected

So that the Tianjin mobile phone manufacturing industry cluster has obvious characteristics, but also a high degree of external openness of industrial clusters.
CDMA phones are now on the use of passive program duplexer, and then even after the PA signal off the power off PA, because PA to prevent self-excitation of spurious signals or signals of the reception. The ASM is now generally used are a number of Japanese manufacturers, mainly HITTICH, Muruta, TDK and so on. They generally do not provide the ASM port S-parameters, but will give some of the reference design. We designed the PCB parasitic parameters of the sample will still have their differences, it is recommended their use in various network analyzer test port impedance match with the simulation. Test impedance, power and software to control the select band, closed end impedance test, disconnect the signal emitted from the PA (remove link in the matching circuit is). Open test with pig tails to do, be sure to remember the pig tail for calibration, the end result is a single port pig tail, the impedance shown in the open points. ASM's insertion loss is very important for the receiver chain, insertion loss is too large, then will affect the receiver sensitivity; ASM TX side of the loss is too large, then, PA needs more power output to meet the power requirements during calibration, which is the deterioration of human the performance of the PA, resulting in some of the spectrum, such as switching the type of problems FAIL. Sensitivity of detecting signal detected by the detector of phone jammer intelligent system has every independent frequency.
In communications product development projects, the measurement is a basic, necessary tools, but not the final goal. More important in the development process is measured through analysis of the data, the use of theory and experience, solve problems and find ways to improve the technical indicators. Here we have research and development in the GSM mobile phone using analytical methods and experiences with their peers for an exchange. If found by measuring the sensitivity is not high, then the problem mainly in the high-frequency or intermediate frequency part of the receiver, followed by the analog I / Q demodulation part. Can be measured by the analog I / Q output level and signal to noise ratio to determine in which part of the problem is. Receiver sensitivity of bids and the main IF amplifier and RF front-end of the LNT in particular, and the first mixer. In many cases, the factors that influence and restrict the sensitivity of the gain is not the noise figure. For the GSM mobile phone in front of LNT requirements are: noise figure less than 2dB, gain about 15dB/GSM900 or 13dB/DCSl800, the first mixer gain of about 10dB. Keying AGC control range can be about 20dB. The ambient temperature of the detector of phone jammer intelligent system is -20℃-+65℃.