Author Topic: Huawei RRU3908 base station teardown and circuit analysis (part 1 & 2)  (Read 247 times)

Offline Mads Barnkob

  • Administrator
  • High Voltage Senior
  • *****
  • Posts: 725
  • Karma: +5/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
The Huawei RRU3908 is an outdoor Radio Base Station with one to four carriers and one to six sectors at 20/40 Watt RF output power per carrier.

Part 1 is the teardown itself with a walkthrough of different design highlights.

/>
Part 2 is coming online in the following 1-2 weeks.

Part 2 is a complete circuit analysis and will also have high res pictures uploaded to this article.

« Last Edit: July 09, 2018, 09:43:08 PM by Mads Barnkob »
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Mads Barnkob

  • Administrator
  • High Voltage Senior
  • *****
  • Posts: 725
  • Karma: +5/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
EDIT July 12 2018: See next post for new video with fixed audio. Sorry for the problems with low audio recordings on the first one.

Central Processing Units

Network communication is handled by a Freescale MPC8321 PowerQUICC2 CPU which runs at 200 MHz and has 2x 256 MB Hynix DDR2 RAM. It utilises a PMC QuadPHY 10 GB controller for the two optical input / output.

Decoding and encoding of the single bit streams for ADC and DAC are handled by the 3 Altera Cyclone III FPGA and the custom Huawei SD6151RBI controllers.

The single bit streams are treated by the Texas Instrument TMS320 series DSP CPUs. TMS320C6410 which is a fixed-point DSP that only calculates with integer numbers and the TMS320CT16482 1 GHz DSP CPU calculates floating point numbers.



Receive part

The input signal comes in two out of phase lines and are first treated by a Skyworks SKY73021-11 1.7 to 2.2 GHz downconversion mixer to get the frequency from 2.2 GHz to 550 MHz.

The local oscillator for the downconversion mixer is a Analog Devices ADF4110B.

A SIPAT SAW filter is used for isolation.

Depending on signal origin or type, I assume that the Analog Devices AD8376 Variable Gain Amplifiers are used before the signal lines split out into either a 3G ADC line or 4G ADC line.

The 3G line analog to digital conversion is handled by the Analog Devices AD6655-10 which is a 14-bit 150 MSPS chip that is specifically targeted for the 3G base stations.

The 4G line has a few more components as there is 2 MCL HSWA+1110 SPDT RF switch that feeds into 2 Maxim MAX2039E up/dowoconversion mixer and through a additional MCL HSWA+1110 SPDT RF switch it is handled by the Analog Devices AD9230-11-200 ADC which is a 11-bit 200 MSPS chip.

All timing is handled by the Analog devices AD9516-3 which is a 14-output clock generator with a built in 2 GHz local oscillator.



Transmit part

The single bit datastream from the Altera Cyclone III FPGA is handled by 2 Analog Devices TxDAC AD9788 which are specified for 16-bit 800 MSPS.

To get the signal up in frequency to the broadcast carrier frequency 2 Analog Devices ADL5375-05 upconversion modulators are used. These has a range from 400 MHz to 6 GHz.

The signal is then sent through a 5 staged ceramic resonator band pass filter.

Signal phase can be switched from the setup of transistors and EMC Technology & Florida RF Labs HPJ2F hybrid couplers.

The pre-amplifier before the signal is sent to the power amplifier is a Freescale MMG3004NT1 high linearity amplifier capable of 17 dB amplification in the range of 400 MHz to 2.2 GHz.

To control the signal strength a MCL 31R5 digital step attenuator sits before the output connector. This is a 31.5 dB attenuator that can work in 0.5 dB steps from a 6-bit serial control interface.



Power Amplifier

The power amplifier uses two stages where the first is a Infineon PTMA180402FL 40 Watt RF LDMOS that through a Xinger II XC1900A-03S hybrid coupler feeds two 90 degree out of phase signals to the output stage transistors which are NXP BLF6G20LS-140 140 Watt RF LDMOS.

The output is recombined in a Xinger II XC1900A-03S hybrid coupler before leaving to the diplexer through a circulator.

« Last Edit: July 12, 2018, 07:55:08 PM by Mads Barnkob »
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Mads Barnkob

  • Administrator
  • High Voltage Senior
  • *****
  • Posts: 725
  • Karma: +5/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Part 2 of 2 video, with fixed audio as good as possible, it was a low microphone level at the recording stage that was the problem, so also +12dB was possible in editing.

http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

High Voltage Forum


 


* Recent Topics and Posts

post My first DRSSTC
[Dual Resonant Solid State Tesla coils]
erdal
September 20, 2018, 10:52:53 PM
post Re: IGBT failure in DRSSTC
[Dual Resonant Solid State Tesla coils]
Felix Bieri
September 20, 2018, 09:45:44 PM
post Re: IGBT failure in DRSSTC
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
September 20, 2018, 09:30:33 PM
post Re: IGBT failure in DRSSTC
[Dual Resonant Solid State Tesla coils]
Teravolt
September 20, 2018, 09:10:10 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
Felix Bieri
September 20, 2018, 07:42:41 PM
post IGBT failure in DRSSTC
[Dual Resonant Solid State Tesla coils]
Felix Bieri
September 20, 2018, 02:42:09 PM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
oneKone
September 19, 2018, 02:28:27 AM
post Re: IGBT selection - TO-247 or minibrick?
[Dual Resonant Solid State Tesla coils]
Garyf
September 18, 2018, 05:51:35 PM
post Re: Theremin based on the stm32f103c8t6 and bluepill, stm32duino
[Electronic circuits]
profdc9
September 18, 2018, 05:00:57 AM
post Re: Theremin based on the stm32f103c8t6 and bluepill, stm32duino
[Electronic circuits]
futurist
September 17, 2018, 08:57:40 PM
post Re: Hacking the IKEA 2000 Watt induction stove (5 parts)
[Electronic circuits]
Mads Barnkob
September 17, 2018, 11:20:53 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
September 17, 2018, 11:17:23 AM
post Re: mmc capacitor banks
[Spark gap Tesla coils]
Mads Barnkob
September 17, 2018, 08:52:32 AM
post Re: Hacking the IKEA 2000 Watt induction stove (5 parts)
[Electronic circuits]
aq62386238
September 16, 2018, 03:31:06 PM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
profdc9
September 16, 2018, 04:34:36 AM
post Theremin based on the stm32f103c8t6 and bluepill, stm32duino
[Electronic circuits]
profdc9
September 15, 2018, 10:55:33 PM
post Re: Garden flag pole hit by lightning
[General chatting]
profdc9
September 14, 2018, 05:13:33 PM
post Re: mmc capacitor banks
[Spark gap Tesla coils]
profdc9
September 14, 2018, 04:50:48 PM
post Re: Garden flag pole hit by lightning
[General chatting]
OakleyC
September 14, 2018, 12:45:05 AM
post Re: Garden flag pole hit by lightning
[General chatting]
Phoenix
September 13, 2018, 09:59:00 PM
post Re: Garden flag pole hit by lightning
[General chatting]
oneKone
September 13, 2018, 03:34:39 PM
post Garden flag pole hit by lightning
[General chatting]
Mads Barnkob
September 13, 2018, 02:35:00 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
September 13, 2018, 08:59:50 AM
post Re: mmc capacitor banks
[Spark gap Tesla coils]
OakleyC
September 13, 2018, 02:09:09 AM
post Re: mmc capacitor banks
[Spark gap Tesla coils]
Hydron
September 12, 2018, 04:16:38 PM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
oneKone
September 12, 2018, 12:21:48 PM
post mmc capacitor banks
[Spark gap Tesla coils]
OakleyC
September 12, 2018, 11:18:07 AM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
September 12, 2018, 08:56:06 AM
post Re: IGBT selection - TO-247 or minibrick?
[Dual Resonant Solid State Tesla coils]
Hydron
September 12, 2018, 08:11:12 AM
post Re: IGBT selection - TO-247 or minibrick?
[Dual Resonant Solid State Tesla coils]
Spuriosity_
September 12, 2018, 04:58:28 AM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Hydron
September 10, 2018, 04:31:16 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Uspring
September 10, 2018, 01:37:22 PM
post Re: new member seeking advice.
[Solid state Tesla coils]
Mads Barnkob
September 10, 2018, 01:36:14 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
September 09, 2018, 07:59:44 PM
post Re: new member seeking advice.
[Solid state Tesla coils]
pentode
September 09, 2018, 09:09:22 AM
post Re: new member seeking advice.
[Solid state Tesla coils]
oneKone
September 09, 2018, 08:42:36 AM
post Re: 160mm PLL sstc
[Solid state Tesla coils]
oneKone
September 09, 2018, 08:22:06 AM
post new member seeking advice.
[Solid state Tesla coils]
shogun94
September 08, 2018, 12:57:25 AM
post Re: Non toroid top loads
[Spark gap Tesla coils]
Patric
September 05, 2018, 08:41:36 PM
post Chineese spark aways !
[Solid state Tesla coils]
pentode
September 05, 2018, 02:30:21 PM
post Re: Hacking the IKEA 2000 Watt induction stove (5 parts)
[Electronic circuits]
Mads Barnkob
September 05, 2018, 01:43:24 PM
post Re: Non toroid top loads
[Spark gap Tesla coils]
Mads Barnkob
September 05, 2018, 01:42:16 PM
post Re: 160mm PLL sstc
[Solid state Tesla coils]
Mads Barnkob
September 05, 2018, 01:35:07 PM
post Re: 160mm PLL sstc
[Solid state Tesla coils]
oneKone
September 05, 2018, 12:36:22 PM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
oneKone
September 05, 2018, 12:31:49 PM
post Re: Hacking the IKEA 2000 Watt induction stove (5 parts)
[Electronic circuits]
aq62386238
September 05, 2018, 11:59:20 AM
post Re: Non toroid top loads
[Spark gap Tesla coils]
Max
September 05, 2018, 11:52:36 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
September 05, 2018, 10:08:06 AM
post Re: 160mm PLL sstc
[Solid state Tesla coils]
Mads Barnkob
September 05, 2018, 08:36:25 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
oneKone
September 05, 2018, 05:44:25 AM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30