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I've got a trouble. When the FPGA SPARTAN 3A3400 work (about 80% resource used), a 7KHz spur and its harmonics occure on the ground. The spur‘s level is about 30mVp-p. when I reduce the FPGA resource usage, the spur become little.
I try to add 220uF tan capcitor, but it does not work.
plz help!
I use TI GC5325 co-operationing with NXP doherty. i'm just in a puzzle about the relationship between doherty's main amp saturation point and the average level after cfr's .
should they be the same?
MC-AMP ACLR question
thanks
holding a 0dbm input signal ,and find the two tone spacing is 30MHz, the IMD is degraded, there is a evidence asymmetry . Does it mean i need to decouple 30MHz spur signal? holding the 1.2MHz spacing, change the level i can find the IMD change, and find asymmetric...
MC-AMP ACLR question
Thanks
I have test the PA's VBW, and I find with different
input power level, the IMD product is changing, or the low is bigger about 10db, or the same level ,or the up is bigger about 10db,
MC-AMP ACLR question
Hi
I got a trouble during debug the MC-AMP for TD-SCDMA. I found the low side ACLR is worse than the up side about 4dB at 44dBm output power. when i reduced the power level to 34dBm， both side's ACLR is the same. I don't know where it's result from.
Plz give me some...
Thanks
I've just shot the trouble, but i don't know the reason.
at power on, do VCO calibration, the IC work well.
if we don't, it goes wrong.
but i don't know why i need a calibration. and what works when doing VCO calibration.
Thanks!
I use the TI TRF-3761,and get wrong output. the pll doesn't lock.I don't know which wrong.
the attachment is the output.
plz help me to solve the problem and tell me the reason.
Hi,everybody! I've got trouble with understanding Repeater. Have you ever thought about the scene that the UE signal level at the repeater's antenna port is static sensitivity level, such as -104dBm with -121dbm noise level for GSM. After the amplification of the repeater, the signal level is...
Hi
Several days ago, I measured the Discrete spurious of a TETRA handset at 813.525MHz, and I got the 2nd and 3rd harmonics, which are about -20dBm. I used MS8608A spectrum analyser, which has 40dBm maxim input power. The handset's output power is only 30dBm. So I directly connected the handset...
Some guy told me, that a crystal will reject single tone signal of adjacent channel by 25dB, but the crystal can only reject cdma signal with the same distance from the center frequency by about 12dB.
I don't know the reason, can you teach me ?
Thanks
when I debug my handset, I found one trouble. when I fitted the antenna and then transmited, the mainboard shut off, but I got off the antenna and transmitted, the mainboard would work and didn't shut off.
thanks!
gqwhut@hotmail.com
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