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55 Threads found on edaboard.com: Antenna Diodes
Hi normally we use PIN diodes for pattern reconfigurable antenna. My question is that as the current in antenna is ac how does the PIN diode works. Because diodes only let current flow only in one direction? When a pin diode is forward biased does it allow the ac current to flow in both direction?
hello.. im designing frequency reconfigurable patch antenna at frequencies 2.45,5.5 and 7.5GHZ in hfss using pin diodes. i have assigned lumped RLC boundary to pin diodes.but im not getting exact frequency resonance. can anyone help me how to use pin diodes is biasing also required for pin diode??
Its informative. Thnx @thylacine1975. But I want to ask something as well.. How can i add schottky diode HSMS 2850 with its parameters in 3D antenna design CST MWS??
hi, i designed an antenna connected with three diodes, i need to switch diode one by one while simulating it., how can i do it? anyone could help me...,:bang:
crystal-2.jpg and crystal-3.jpg is a 10uF 16V electrolytic capacitor. 'antenna' is a transformer, you umight find it has diodes underneath it in which case it could be a balanced mixer. Most likely it is just two windings, one on each side of the substrate. No idea what R8W is I'm afraid. Brian.
Each capacitor appears Zc=1/(2pif*C) + ESR. the diodes are dynamic resistance and depend on size. You wont be able to match the impedance because the coupling current and spacing loss makes the input impedance high and the closer you get, it can drop below 50 Ohms. You are much better off using a step-down inductive coil antenna to boost the
I've never seen an attempt to predict in-process charging, gate oxide tunneling nor the photoconduction of antenna diodes. In fact I have often seen antenna rules show up after several revisions of PDK, without. If you want to go back to wet etches and >>1um feature sizes and lousy aspect ratios and so on, have yourself a time. You'll (...)
What is antenna Effect ???
Can you please help me out that for fixing antenna violation which terminal of the dioade is connected to ground and which to effected pin?
Dear All, I am working on frequency reconfigurable antennas using pin diodes. For OFF mode I am using capacitor value of diode. antenna is reconfigured; however its S11<-6dB is not achieved for lower bands. Kindly suggest some solutions.
Interesting question. Maybe, the light has to be a pure single wavelength so it might be possible using LASER diodes. The difference with antennas is you provide the signal to drive them, an LED produces it's own signal. Brian.
:roll:In order to avoid antenna effect during process fabrication, we will aviod usage of long inter connects or poly directly to the gate of mos transistor, using jumpers, bridges, net area check diodes will be added. Now i want to know apart from the above mentioned methods is there any other methods to avoid antenna effect. (...)
how to add diodes in circular microstrip antenna in ie3d software.............help asap plzzzzzzzzzzzzz......
What seems to be the problem? Do you know any HDL ? want to design reconfigurable antenna and PIN diode on that antenna can be controlled or biased using FPGA so that it can give multiple bands in 01,10,11 states. but as I am unknown to FPGA not getting it. but want to perform it.
I?m developing a simple, five-frequency superhetrodyne receiver to operate between 2.5 MHz to 20 MHz in which the local oscillator crystals and whip antenna tuning circuits are selected (switched) using diodes. Here?s the problem: The whip tuning circuit is comprised of a single variable capacitor with five fixed-value inductors, each in seri
If this is a real product, your real customer will have some demands on pins that are exposed to the outside world. antenna connected circuits are one such, if the antenna is not encased. You might look at making the ESD clamps' breakover voltage higher, at mimizing their shunt C (many clamps have parasitic diodes whose C-V characteristic (...)
... How we will protect a transistor in such cases??? I have a different suggestion: An external protection against negative overvoltage with an appropriate current limitation resistor and 3 diodes D1 .. D3 in series to GND: obvious
On the internet most approaches uses 3 antennas. 1 TX and 2 RX for monopulse azimuth detection. I am thinking about signal inside the patch. I want try to put receiver diode directly to the patch, so it becomes self-mixing radiating patch. For 4x4 array, whould other 4x4=16-1=15 patches disturb phase of current patch RX signal? As they all connecte
we have prepared an antenna using copper plates, wherein the radiating element is 5x85mm,groundplate is 80x80mm and in between radiating element and groundplate there is a gap of 0.6mm.(air as dielectric) however we want to incorporate tuning into this using a varactor. How do we go abt it? when we connect a DC circuit,what values of capacitor ,re
Hello Everyone, I am doing a project on physical design and came across some antenna violations in my design.... When i checked for the violations all the violations were on the top level metal layer... I know it can be fixed using antenna diodes, but what i didnot understand when i saw the antenna rule file is that (...)
Hi, I am in the confusion of using diodes for antenna error correction. For a PMOS gate, 1.When I put diode in nwell, the P-type is connected to the net and n-type to VDD(the well supply), the charges (accumulated during fab) at the gate will forward bias the diode there by damaging the gate oxide connected to net. 2.For the same PMOS, I put
antenna is something that happens while getting fabricated esd occurs after chip gets fabricated when a machine/human body touches the IC. hope this is useful
Hi everyone, I want to produce a new beam switching high gain antenna array that is able to direct its main beam towards predetermined locations. I aim to use PIN diodes to control antenna segments or feeding networks to enable beam switching. I am also using CST to simulate the patch antenna. Two questions..... 1) (...)
hi how i design microstrip patch antenna with diodes like this what is procedure for such kind of designs does hfss has diode can i place it some position in designed antenna n see results? reply soon kartik
i was simulated in ideal conditions through strip line but i want use diode so please help how i put diodes in cst mws ?? & how to create baising ?
I had finish fabricate a patch antenna for capture 2.45GHz. and the second step, I want to searching any circuit to convert from RF to DC Volt. The dc volt will we get from I reading not more than 3Volt. So, I try to get below 3V and enough to light up the one LED for show to other RF can convert to DC. I still student want to design just for evide
can u give me some links or material for designing switches. or designing pattern reconfigurable antenna
diodes are very non-linear. You are probably generating some DC voltage, but it is microvolts and you do not see it. You need to use an "RF" diode, probably a "zero bias" one to use with an antenna. You need a capacitor at the output that can pass DC volts, but block RF energy from travelling down the wire to the oscilloscope, as a minimum. The
ya, ok..i know zener in redusing antenna violations, are we using zener diodes? When there are static charges accumulated on the net this zener diode will bypass these static charges to the gnd. These static charges come into picture while doing the etching process using CMP.
I have two antenna violation in my layout. Long metal is connected to pmos gate. I plan to use reverse biased diode to solve the problem. how should I connect the other terminal of the diode? If I use N+/pwell diode, should the other end connect to ground ?
a) if you look at any diode characteristic you will see that even reverse biased diode is still letting some current through. Not much but enough - you can actually use it for your design if you are careful. Very often it is used for biasing of substrate in case of "overvoltage" circuits. That said diode does not have to break down to provide curr
antenna diode just work as ESD protection device that will clamping gate voltage.
I think he's referring to the antennae diode. antenna effect - Wikipedia, the free encyclopedia
It is possible. you will have peak to peak voltage of perhaps 3v, which is around 1v rms, which is around 10-20 milliwatts. If you hook that to a quarterwave antenna (15 meters long wired), you will have a detectable signal -20 dBm or so, assuming 0 dBi antenna gains) at the distance: Intelligen
To Radike, antenna check is layer by layer. Which layer did you get this error? - if poly, then perhaps it might be the case, you are using too much poly for interconnect between the MOS gates. Use Jumper rule first to avoid as much as you can. I won't recommend using reverse-bias diodes as a first method, diode insertion is bad w.r.t. low-power,
Hi, check these links antenna diodes explanation antenna diodes role
You can use simple circuit. Use SPDT to switch between Tx and RX. i.e common poet connecting to 433Mhz antenna, one end to Tx and the other to RX.
Don't think so. Isn't this a cap, rather than a diode? ;-) If I am not wrong, the Source and the Drain act as the diffusion diodes to sink in the extra charges due to the antenna effect. Connecting the gate to ground avoids the channel formation. Taking a small metal jump to the higher level is the first step that s
Hi, everyone. I am design a 2.4GHz CMOS transceiver IC. But I don't know how to connect PA with LNA to share the same antenna, and has TX/RX switch. The PA core and LNA core are depicted as the figure below. Anybody can help me? Thanks!
Hi, As we know, inorder to eliminate the antenna effect in process, DN (N+ on pwel) and DP (P+ on nwell) diodes are used to protect the devices. What is the consideration when use DN and DP, and why, normaly, DN is more widespread used than DP? Thanks!!
Hi , Plz read the given below mentioned link (antenna Section) , your doubts will be clear : If you still have some doubts , do ask!!!
Hello all, I have one clarification, can anyone help me in this? Actually for antenna effects, we keep antenna diode to protect gate from charge formed on long metals connected to gate. Normally which type of diodes are preferable? N-type or P-type? else we should keep both N-type and p-type diodes at the gate? Please (...)
dear dude, Adding reverse diodes, or using jumpers or jogging are only three possible ways to fix antenna violations. Santu
both of antenna diodes and using the metal jump can solve this problem. antenna diodes is convinient when you are running the APR.
When a chip is manufactured, long metal wires acts like an antenna and picks up charge. If this long wire is connected to a MOS gate, it can blow the gate. So, manufactures typically have max length of metal that can be connected to a gate. You can add diodes or jump layers to help fix antenna violations. diodes will (...)
u get all different runsets for verification one is there for antenna check ......which would give the desired op....and then inserting diodes.....one way to remove antenna effect.........
antenna diodes are required to protect the gate oxide of mos transistors from charge during wafer fabrication. Polysilicon and metal layers are (nowadays- formerly wet processes were used) etched by means of plasma processes. Plasma etching can lead to charge built- up in metal traces. If these metal traces are connected to a gate, the gate oxid
If your transmission on 430MHz is at different time than the receiving on 433.92MHz, and if you use the same antenna for both RX/TX, the only thing that you need is an antenna switch SPDT. You can make one of these using PIN diodes:
circular polarization can be obtain by using shorting pins and plates in design.. generally in reconfigurable polarization diversity antenna's switches, diodes (which are made ON and OFF for changing polarization) can be replaced by shorting pins or plates... i.e. ON switch can be replaced just by shorting pin and OFF switch is replaced by open sp
I don't think it necessary to add a reverse-biased diode at EACH gate. But it is necessary to add diodes to SOME of gates which otherwise will voilate the antenna rule.