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Hi all,
I always find this kind of die photo with many
white spot like in the attached picture. are these bonding
pads or some other use? if they are bonding pads, how
do so many bonding wires connect to such a chip?
or they use probe station to test this chip?
Thanks
Hi all,
what's the difference of matching between RFIC system and discrete system?
some one said:
"It depends on the operation frequency and dimension of your circuits.
If you are doing IC design for RF, typically the dimension of the metal
trace delivering your RF or LO signal to mixer is...
mosfet ring mixer
Hi friends,
I am designing direct conversion receiver with mosfet ring mixer in RFIC
project.
For the reason of high P1db needed, mosfet ring mixer is connected to antenna
directly. Carrier: 900MHz, LO:900MHz.
My confused spots are as following:
1. Does the mixer need...
pa interstage match
Dear all
My PA is two stage Class AB power amplifier, which
target ClassAB output 15dBm with 1.8V power supply @900MHz。
The structure is as following:
power stage：
structure：cascode ClassAB
input power：5dBm
power gain：10dB...
gsm+blutooth antennas
Dear all,
Many GSM phone embeded bluetooth function. How bluetooth share
antenna with GSM module? You know GSM work in different band from bluetooth's.
Best wishes
Dear all,
In wireless powered system, like RFID tag, IC is powered by
the power capture from antenna. That means only the two antenna
terminals are interface between IC about outside world.
My question is, what is whole chip GND of such kind of chip?
One of the antenna terminal? or...
scs file cadence
Dear all,
I run my simulation with spectre of Cadence. One diode i wish
to use is only .scs file and no symbol with it.
You know the simulation flow is usually draw schematic first and
add stimi, then evoke spectre and run simulation. Without symbol, I
have no...
Thanks all,
So I make my increase LNA's input P-1dB to
0dBm while 10dBm for mixer and 10dB power gain
for LNA.
what's your opinion?
By the way, I prefered passive mixer for my
application. Is that OK?
Best wishes
Hi all,
I am designing a direct-conversion receiver for UHF RFID reader but
with some confused question about how to define IIP3 of such a system.
This application defines 250KHz for each channel while a large block
signal(say -15dBm) centered at the center. Two desired signal spaced...
Dear all,
Do any one know how nonlinearity come from LNA(inductive degenerated
common source). I am design lna with more than 3dBm P1db compression and
>10dbm IIP3 in 0.18um rf process.
Some paper and book said increase over-drive voltage will improve P1db
because gm becomes...
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