Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Have a look at the battery life of some phones - they usually give the talk time & standby time. With the battery capacity data (in Ah) you can then calculate a rough power consumption. You will find that standby times can be a few weeks and talk times a few hours, so you will see what consumes the most power. The displays consume a lot and bigger displays consume more. WiFi usually consumes more than phone calls, I believe. In standby they can use the signal received strength to reduce the receiver power consumption if the signal is strong.
Have a look at the battery life of some phones - they usually give the talk time & standby time. With the battery capacity data (in Ah) you can then calculate a rough power consumption. You will find that standby times can be a few weeks and talk times a few hours, so you will see what consumes the most power. The displays consume a lot and bigger displays consume more. WiFi usually consumes more than phone calls, I believe. In standby they can use the signal received strength to reduce the receiver power consumption if the signal is strong.
This is one power consumption breakdown years ago. It has PA current ~200mA which is close to the number I calculated as you suggested.
I checked iphone spec, they listed talk time 7 hours, wifi 10 hours and 3G 6 hours.
So I assume wifi or 3G use power amplifier and are driven directly by battery also, right?
There's no such thing as normal. Power levels are "negotiated"
with the base station, to suit the situation. Everybody engineers
to a best-guess "use model" when optimizing efficiency in the
RF section.
GSM phones average about 2.0 mA's in standby. Talk runs between 70 mA to 200 mA depending on PA power level. GSM PA has high burst current during its active slot. 900 MHz PA can draw as much as 1.8 amps for the slot. This can be a problem as battery ages and its Rs increases. When battery degrades to Rs of about 0.35 ohms it usually results in early low batt warning.
CDMA and WCDMA phones average about 3.5 mA in standby. Talk run between 170 mA and 500 mA depending on PA power level.
Smart phones are wildcards. Processors and display can draw significant current from battery depending on use case, from about 15 mA for MP3 play to over 750 mA's for a video record, depending on video accelerator engine within apps processor. The display with backlight draws about 150 mA.
From the table shown above, all blocks are below 3V, i.e., these blocks are supplied by a buck converter. I am wondering whether a boost converter is needed in a cellphone? Because I think the LCD screen and the speaker should need a power supply of 3V~4.5V. Anyone knows?
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
