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Hi All,
I am using a level shifter ST2378E. I want to shift 3.3V to 2.5V.
when i apply a
3.3V, 1KHz CMOS Square signal to I/OVcc(3.3V side) and see the output at I/OVL(2.5V side) i see a signal which goes to 2.5V with out noise and the 0V very noisy and noise going upto 2.5V
when i apply 3.3V...
please some help me
i am using ad9513 for supplying clock to transceiver.
the transceiver needs 800mVp-p signal.
i am converting one lvds o/p of ad9513 to single ended with a transformer.
ad9513 datasheet says differential 450mV max and common mode of 1.25V for lvds o/p.
if i convert this to...
see page 7 of link 1 document to avoid RF current getting grounded and to reduce noise due to a pole at the output a series inductor is used at input with out a coupling capacitor
from page 10 of link 2 document :Gate to source capacitance becomes significant and an inductor is used to nullify...
if you are designing an amplifier put a shunt resistor at the output, simulate and optimize resistor for K>1. read some material on amplifier stability.
if you are designing a oscillator put a tank circuit at the output to choose a frequency at which the oscillator works.
did you supply IF as a tone or a modulated signal. if it is a tone-- fig shows mixer is not acting as a double balanced. since all the sidebands are seen.
if you are supplying a modulated signal -- check in VSA the spectrum and the constellation.
spectrum analyzer is used for seeing the sinusoidal signal power, frequency etc. you can measure tone power, freq etc
if you apply RF signal to signal analyzer it can down convert the signal to digital signal and can make you to analyze the signal in terms of constellation, spectrum, spectral...
unlike GSM, CDMA has a reuse factor of 1, since the users are discriminated with respect to codes. all the frequencies with in band(824-849MHz) separated by channel raster 200KHz(in case of WCDMA) can be used as channels. you can read ETSI/UMTS standard for channel numbering. there is a formula...
usually the first stage is LNA. the RF signal from antenna is a single ended signal so LNA is single end input. the second stage of LNA is made as differential to reduce common mode noise and to cancel out even order hormonics.
if you are using ADS. check the examples for the same. or else motorola MRF parts have schematic for 1.8GHz which you can draw yourself in ADS. you get the MRF part models also online for ADS.
---------- Post added at 12:33 ---------- Previous post was at 12:26 ----------
Also check Freescale.
hi,
i want to create a padstack for TH connector.
the connector footprint says 40mils dia. but the actual pin is 25mils.
so my doubt is if this 40mils is the actual drill to be made on the board?
please help
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