What are these components in my mobile-phone's schematic? - Page 1
Forum section: electronics / beginners

author: rozeh
author_rank: Regular Contributor
timestamp: October 19, 2013, 06:08:47 am
content: Hi guys. i have a schematic of my mobile-phone and i have several questions.A)first look this image:1- What's this component?2- What would it do?B)first look this image:for number one and two: What are these components and what would they do?C)first look this image:For numbers one and four: What are the means of these connections?For number five: What's the means of this symbol?For number three: What's this components and what would it do?For number two: What's the means of this phrase "42R/100MHZ"D)first look this image:For numbers one and two: What's this components and what would it do?For number three: Why are the naming of these capacitor and inductor strange?(3n3H and 2p2)

author: andtfoot
author_rank: Unknown
timestamp: October 19, 2013, 06:19:11 am
content: Quote from: rozeh on October 19, 2013, 06:08:47 amIt is pretty normal practice to use the unit instead of the decimal point. A decimal point may be hard to see, or on a printout could be rubbed off or confused with ink spatter.Those two examples would be 3.3nH and 2.2pF respectively.

author: SeanB
author_rank: Super Contributor
timestamp: October 19, 2013, 06:39:08 am
content: A is a filter to reduce radiated emissions, it is a added component to enable the phone to pass emission testing.B1 same as A aboveB2 is an amplifier with shutdown capability so it can be turned off when the speaker is not needed to save power.C3 is a multiple transient suppressor to absorb any transients coming in on those lines.C2 is a spec to say that the impedance of the RF choke must be 42 ohms at a test frequency of 100MHz.D1 is a RF filter for the RF output, likely a SAW filter or a ceramic resonator in a cellular phone. 897.5 MHz is the centre frequency.D2 is a pi matching network to give the right impedance at both input and output so as to allow best power transfer.

author: mariush
author_rank: Super Contributor
timestamp: October 19, 2013, 06:48:20 am
content: A) Do you have a problem using google? Enter the part number in a search boxhttp://pdf1.alldatasheet.com/datasheet-pdf/view/233139/STMICROELECTRONICS/EMIF10-1K010F2.htmlEMIF10-1K010F2 - 10-line IPAD™, EMI filter including ESD protectionHigh efficiency in ESD suppression on bothinput and output pins (IEC 61000-4-2 level 4)? High reliability offered by monolithic integration? High reducing of parasitic elements throughintegration & wafer level packagingComplies with the following standards:? IEC 61000-4-2 level 4– 15 kV (air discharge)– 8 kV (contact discharge)? MIL STD 883F - Method 3015.7 Class 3B)1 ... looks like inductors in a chip package, no clue.2http://www.ti.com/lit/ds/symlink/tpa2010d1.pdf2.5-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIERC)1. looks to me like a voltage reference (see anode, cathode, diode symbol) .. ISDA18makes me think it's a 1.8v voltage reference2. L tells you it's inductor ... 42 uH with 100 mhz frequency3. ESD protection .. protects against static electricity and other crap4. no clue, j may mean jumper, may mean other things.5. no clue, maybe some emi protectionD)1. IC, maybe gsm signal decoder or amplifier?2. resistor network several resistors in a package3. L tells you it's inductor, the ones below are capacitors .. C tells you that. 2p2 = 2.2 pF etcps. cool, SeanB knows more about this than me, he already gave you a good answer.

author: Stonent
author_rank: Super Contributor
timestamp: October 19, 2013, 08:32:35 am
content: My screen isn't big enough to look at them all first.

author: amyk
author_rank: Super Contributor
timestamp: October 19, 2013, 08:46:57 am
content: Use the Google...B.1http://media.digikey.com/pdf/Data%20Sheets/TDK%20PDFs/MCZ1210%20Series.pdfC.1http://www.bdtic.com/DataSheet/ST/ESDA18-1F2.pdfC.3http://datasheet.octopart.com/ESDA14V2-4BF2-STMicroelectronics-datasheet-16346854.pdfC.4 test pointsC.5 more connectors?D.1http://www.alldatasheet.com/datasheet-pdf/pdf/357299/PANASONIC/EFCH897MTDB1.htmlD.2 3dB attenuator. Probably something like this:http://www.susumu-usa.com/pdf/products_38.pdf

author: rozeh
author_rank: Regular Contributor
timestamp: October 21, 2013, 02:11:00 pm
content: Thanks Guys!