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We design productor with FM funciton,
But FM sensitivity is very bad at 103MHz only, there is 10db worse than other frequency.
I do some analysis and experimentation, but I can't find root cause also.
please give me some suggetions.
(Note, FM is 1.8v and 3.3v power supply and 24MHz clock)
thanks umesh49,
how to calculate IC, IC=IE-IB?
---------- Post added at 09:21 ---------- Previous post was at 09:19 ----------
hi Kaka111,
I think this current is IB only
Imcusource = (2.5 - 0.7) / 10 [mA] = 180µA ( assumed : mcu inner impedance = 0 )
(2.5v is not right, I think)
if it...
Hi everyone,
here is a not logic circuit, I have some questions about it? please help.
1) is it not logic circuit?
2) if MCU is high level, how much power consumption (current) for this not logic circuit?
3) if MCU is low level, the result is?
thank you
Hi guys!
I am designing consumer product with Bluetooth function, but my product could find other device via Bluetooth, and it is not discoverable by other device via Bluetooth.
What happened?
How to solve this design problem?
please give me some ideas
Note
Bluetooth interface: UART
Hi ckshivaram,
thank you quick reply.
if this, base on this case in my picture, Host is DTE, GPS or BT is DCE, right?
So Host CTS will be connected to GPS or BT CTS,
Host RTS will be connected to GPS or BT RTS, right?
Hi everyone,
as you know, E-ink (e-paper) is new product in current, there are no many technic document to refer.
but I still have some questions need you support.
1. what characteristics is it?
2. How to inspect it?
3. What equipment do need?
.................
eg. I want to evaluate its...
hi everybody,
Could you tell me how many invalid block in Nand flash for different capacity?
I check samsung Nand flash datasheet, I found some information about it,
but I am not sure my understanding is right or not?
please help confirm and give me a support.
you can refer to attached...
a pin with the number + exists twice in + package
Hi,
I get this error message every time I do "Cleanup Cache" on Design Cache.
It is quick coumbersome because similar messages would show up many times for the specific package "XXX".
But the question is there is no "XXX" package neither in...
what is A
hi, this is a photocoupler control circuit.
you can see it from the attached picture,
my questions is,
what circuit or component can be suitable A
Note,
1) input>5V, the OP1 can't work
2) 5v≤input<100v, the OP1 work
I have a circuit about power supply control,
please review the circuit as attached picture.
Now, there are some questions need your support,
1) how to work, Q4 & Q3
2) what function is Q4?
3) Can I cancel Q4,and control Q3(MOSFET) with CPU? please review picture 2
thanks very much
why is this formula
hi, everybody,
please review the picture as the attached.
there are an assume,
Vin=12V
Vout=5v
D=Vin/Vout=5V/12V=0.416
my question is
Vin=12V,Vout=5, so
D=Vin/Vout=12V/5V,and it is not Vin/Vout=5V/12V,right?
what is D?
what formula is right for D?
Note,
this file...
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