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Wonder why they have multiple power management/amplifier modules ? : 1. Apple/Dialog 338S00120 Power Management IC 2. Qualcomm PMD9635 Power Management IC 3.
by chocks 11y ago
Wonder why they have multiple power management/amplifier modules ? :
1. Apple/Dialog 338S00120 Power Management IC
2. Qualcomm PMD9635 Power Management IC
3. Texas Instruments 65730AOP Power Management IC
4. Avago ACPM 7714 Multimode Power Amplifier
5. Avago AFEM-8030 Power Amplifier Module
6. Skyworks SKY77357 Power Amplifier Module (likely an iteration of the SKY77354)
7. Skyworks SKY77812 Power Amplifier Module
- fra 11y agoI think because every LTE band you want to support requires its own front end with its own power management. The iPhone 6s is as close to a universal SKU as you get with LTE so they pack lots of those.
- mbell 11y agoWell, the first three you mentioned are for providing power to other chips, the last 4 are RF amplifiers, they aren't really related. Why you need (or want) multiple power management ICs: they are likely powering separate zones of the board which may have very different power requirements, e.g. need different voltages, need to be able to power up or down separately, or need particularly clean power. Why you need multiple RF amplifiers: Almost all phone today run on many different cellular frequencies and protocols, a quick look at the specs indicates the iPhone 6 supports: 800Mhz, 850Mhz, 900Mhz, 1700Mhz, 1800Mhz, 1900Mhz, 2000Mhz, and 2100Mhz along with various different signaling schemes. You can't handle all that in a single RF pathway.
- samstave 11y ago>need to be able to power up or down separately Need to be able to power on the Data, MIC and Camera per the Court Order without waking up the rest of the phone :)