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Instrumenation amplifier boosts only the difference of the input signals while attenuating the common-mode signal. The attenuation is given by CMR value and is usually about 90dB. It is used for example by measuring ECG signal (weak potential difference at 2 points) while the capacitively...
jtag optocoupler
Dear all,
I designed a board that uses optocoupler ADUM2401 in order to isolate JTAG(connected to PC) and microcontroller board (MSP430f1116). Unfortuanately it will not work.
I noticed on the osciloscope that the JTAG steps up the signal levels and probably waits for uC to...
jtag schmitt trigger
Dear all,
I designed a board that uses optocoupler ADUM2401 in order to isolate JTAG(connected to PC) and microcontroller board (MSP430f1116). Unfortuanately it will not work.
I noticed on the osciloscope that the JTAG steps up the signal levels and probably waits for uC...
Re: Balun question
yes its 2.4-2.5Ghz zigbee tranceiver, here is the manual, have a look at page 19 and 55, there is some description but very general.
**broken link removed**
Re: Antenna polarisation
the antenna will be placed on the back of a man, and the reciver can be placed somwhere nearby. The problem is what happens with the transmission when someone will be sleeping , the polarisation will not match then (around 90 degrees) and there will be no direct...
Re: Antenna polarisation
Yeah i know the 20log(cos(alfa)) formula but it means that for alfa=90 i shall not be able to recive any signal at all. And I think its not the whole truth. As far as i know mobile phone is linear polarised as well and its still working in various positions ...
The...
Re: Balun question
Here are the values , sry for that. U helped me a lot but im still not certain about antenna matching. If u had to match the antenna would u only change the C62 value ? Normally there is an inductance also needed for proper antenna match.
Why is actually L61 needed ? How is...
Hi,
could someone pls explain me the way this balun is working ?
Can a balun be a matching circuit for the antenna at all or do I need additional 50ohm matching circuit ?
Thank u
Antenna polarisation
Hi,
im designing a device using zigbee protocol for communication (CC2420 chip). For this chip i have chosen a 2,4GHz monopole (www.antenova.com). The antenna is lineary polarised. The thing is that this device can sometimes transmit in vertical and sometimes in orthogonal...
Re: Voltage Noise
> if the noise is input referd then it is divided by the whole gain
In other words , d u mean that the real output noise [noise that i see on my oscilloscope] for Gain =100 is simply 35nV/Hz * 100 in this case ?
Do i must simply multiply the noise stated in the figure by...
Re: Voltage Noise
indeed u are right in this, but its not SNR given in the figure but the spectral noise density in nV/sq(Hz). The figure desribes Output noise referred to Input with respect to the Gain. So please do not think about SNR in this case, thats my opinion.
Output noise can vary...
Re: Voltage Noise
> Gain, usually means differential gain, acts upon wanted signal.
>Noise, regarded as common-mode at the input, gets rejected by means of
> common-mode rejection.
Of course, that are basics of in-amps
> For output noise, you should consider noise injected from amp + noise...
Hi,
Im trying to compute SNR for my circuit and have some problems with noise. I use INA326 IN-AMP and according to the datasheet :
h**p://focus.ti.com/lit/ds/symlink/ina327.pdf
(page 5) is the voltage noise at Gain=1 about 900nV/sq(Hz) and at G=100 about 35nV/sq(Hz).
1. First question and most...
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