Search results for query: *

thanks so far and i don't expect you to, but could you give me a good-to-the-point reference that i can learn it from. i have found much material but most of it is not very practical.

i am using the very excellent ad8137 diff op-amp. it should be fine at 2 MHz with a gain of 10. the LC network should be impedance matched than? how do i calculate the source impedance of the LC network?

I am working with 400 KHz, and 2 MHz. I am assuming that the LC network does not require impedance matching since it has such low impedance.

thanks for the replies, trying different things. now i am finding the LC networks is being unbalanced by the diff op-amp. do the diff op-amps have a high differential capacitance?

I would like to have a regular op-amp (single ended) input driven via differential outputs from a differential op-amp. I assume this will be better than going to a single ended configuration right after the diff op-amp (typical configuration). The question is how to best interface the ad8137 in...

that could be a way to do it, but i am just trying to have the rf signal picked up by the receivers. eliminate all other sources. this tool is used to measure resistivity of mediums by sending rf through them and measuring attenuation and phase shift. this is why all other signal paths must be...

correction regarding the metal tube. the tube is stainless steel, and therefore non magnetic. this means it should not permit magnetic flux. so this means that the system does not form a large magnetic field? this makes me scratch my head even more, since i cannot see how the tube is coupling...

the transmitter is about 2.5 feet away from rx1, and rx2 is about 1.5 feet away from rx1. both frequencies are transmitted at about 60 vpp. both receive coils are part of one circuit system. the metal tube is in sections, but system is used with the tube combined (electrically conductive from...

well it is my understanding that that is what i am doing. both receive coils are used in differential mode. when the metal tube is separated where the transmitter, and both receivers are all isolated the receivers only get fr power. when the tube is connected together, most of the power on the...

In the attached file, the transmitter is isolated from the metal tube. The receivers are also isolated from the metal tube, but common to the transmitter. Using a differential mode on the receiver coils, would signals picked-up by the metal tube be rejected by the receivers? Also, would the...

because in our application we have 2mhz rf section. anything over that would not be an issue regarding noise.

yes, the am radio analogy is dead on. and yes it is all about maximum power transfer with resonate circuits.

yes i have found isolated flyback regulators, but they don't come in greater than 2 mhz, or even close.

for the second time. nothing to do with school work! obviouslly it is a requirement of the desing to use the frequencids and antenna types (again not nagotiable). i am here because i don't have much of rf background. so if you don't know the answers or don't wish to help, don't bother. thanks alot.

carrier frequencies, but they are pure sine waves. the transmitter is about 3 feet away. the desired receive power would be from 100mvpp to 1vpp when transmitting with about 50ma on transmit coil with similar characteristics of receive coils. please have a look at the receiver side of things...

actually i have to scrap this idea, as it violates one of the design requirements.

no. do you guys have any opinions on the way the tuning is being done???

because i cannot use any other. antenna type is not optional. that is what i have to work with.

hi, i am building a transmitter and receiver using solenoids. there are two frequencies i am using, 2 mhz and 400 khz. the receiver has a photo-mosfet to select between two tuning circuits. the receiver is parallel tuned to minimize energy loss in the tank circuit, which is ac coupled via...

hi, i am trying to isolate the output of a buck converter. the challange is with the current mode sensing of the output. is there a efficient way to do this? it is linear tech's lt3694. i am using a transformer to isolate the secondary (output) where i have a split +/- 7v outputs. i have seen...