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Hello
I would like to seek some help from the various experts here.
As you all maybe aware, CDMA and LTE are cellular technologies.
I have come across a variant of these which is a "trunking" version of it, using cellular networks on CDMA or LTE.
Primarily being done by ZTE and Huawei.
Anybody...
Hi
LTE FDD will require two frequency spectrum allocation, one for UL (uplink) and another for DL(downlink) separated by a few tenths of MHz.
Does RB allocation by eNODEb have to be symmetric?
For example, if my UE is doing Youtube which is heavily DL, can it be allocated, for e.g. 50RB...
Hi
I am interested to know the details and technicalities of a automated memory controller phase tuning. As the EMMC/DDR memory gains in speed, the timing constraints and Signal Integrity become more and more important and critical. I have got some information from JEDEC but the details are not...
Hi
I have a MCU with multiple audio peripheral interconnects that is interfaced via I2S.
The MCU is the I2S Master generating the FS and CLK signals to all peripherals.
Now i would like to add another audio peripheral, however it only supports 2-slot TDM (short sync pulse).
Since I am stuck...
Hi EDA forumers,
I am trying to do some digital logic based simulation to add some flip flips, and digital logic to a I2S waveform source.
I would need a synchronised Frame Sync (FS), Bitclock (CLK) and a pre-defined data generator (0-01-...FF).
What is the best recommendation for this?
I have...
Hello, another great example of the possible leakage issue can also be seen in the below application, which I have taken from
https://fritzing.org/projects/charlieplex-snowfallshooting-star-20-leds
Same scenario, when trying to intentionally turn on LED04, the anode (green) would be ~5v, and...
Hello
I am designing a charlieplexing LED drive scheme using an Arduino board.
Connection are something similar to the above.
LED1/2/3/4 are all RED LEDs with a Vf of ~2v.
LED 5/6 are BLUE LEDs with a VF of 3.6v.
All LED source is driven from 5V supply.
In theory, when I am driving LED5 to be...
Hello - I do not have access to the MIPI specifications as I am not a member.
I would like to seek advice on a high level, what the differences are between the MIPI SPMI interface vs. I2C vs SPI for example?
It would seem to be that its a multi-drop bus protocol, similar to I2C. but i am not...
Hi
thanks for the replies. It would seem just like LDO's, most buck regulators are more efficient with lower Vin due to the internal NFET/PFET losses and inductor losses.
Another question, is for a single cell design (LiION) from 3-4.2v operation, with a constant power load which requires a...
Hello friends,
I was looking in regards to buck regulators and i am wondering why is it that, for a fixed output voltage/output load.... the regulator is more efficient with lower Vin, as opposed to higher Vin.
e.g. https://www.ti.com/lit/ds/symlink/tps62590-q1.pdf datasheets.
See Figure 2...
Thanks for the reply.
If my device (MCU/CODEC/etc) all operates at 2.8v, is it still worth it to use a buck regulator at 2.8v driven from Li-Cell operating from 4.2v to 3v?
With a constant load of ~100mA, with a buck regulator at 2.8v with 90% efficiency, I would be saving ~15mA at the battery...
Hi, yes there are cost associated with series batteries. However from the calculations, it has the same energy density.
Two 50mAH 3.7v in parallel = 100mAh - .37Wh
Two 50mAh 3.7v in series = 50mAh - .37Wh
Hi
Need some advise.
I am making a portable device using Li-Ion batteries and battery life is my #1 priority.
My load on the battery is a MCU which is continously running and have a constant load.
In parallel to the battery I have a audio amplifier which can operate at 7.4v (louder) or 3.7v...
FvM - The Greinacher circuit tip really helped.
However I would think the capacitance value of C10 (47pF) and C13 (1.5nF) would need to be the same value if it was to 'double' equally right?
- - - Updated - - -
Actully i think I get it now. C10 & D5 would for a Villard doubler.
D4, C13 & R7...
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