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156 Threads found on edaboard.com: Layout Amplifier
No need to make a guard trace between pin 2 and 3. A critical point is the creepage path between pin 2 and 3 (V-) on the package surface. For critical applications use an electrometer OP with alternative pin layout like OPA129. Should I remove ground plane bellow this input in order to minimize parasitic capacitance on this pin?
Hi guys I am designing the layout of a a differential amplifier in cadence virtuoso layout xl and technology node is 40 nm. This reqyuires matching of two nmos devices. suppose i made an array of 4x4 to macth two nmos devices, then according to the rule of 40 nm global foundries, how many dummy layers surrounding the main device should i need ?
First I would check that your layout is appropriate, according to the manufacturer's recommendations. A little extra source inductance can have a large impact. You may need to add lossy elements to the amplifier to get wideband stability. This can be shunt resistance on the gate or drain to ground, or a series RC connected between the gate and dra
You say pre layout the simulations are fine. The common mode is correct right. Is there asymmetry in your layout which is causing this offset?
The second schematic doesn't make sense as shown, it misses a connector for the feedback path. To understand if the loop layout has any relevance for the amplifier performance, some basic parameters must be known like: - amplifier and signal bandwidth - resistor values I guess, each topology can be useful under specific circumstances.
Choice of two problems:- 1 there is a wiring fault, 2 bad layout or decoupling causing high frequency oscillations. So if you have a scope put it on the output see if you can see any wave form with no input. If its oscillating then the wave form is normally huge like+- Vcc p-p. in this case the layout and or decoupling is wrong. Often touching a s
I want to practice some etching, Does anyone know where I can get some pcb layouts of amplifier circuits like 600 watts and above?
Dear Sir, I'm designing my first analog layout. In particular I'm designinng a conventional four stages Distributed amplifier with SG13S process. When I introduce the inductors in the layout, I obtain a loss of gain of 2 dB due to the interconnection routes. Could you suggest me how can I improve the interconnection? I attach a figure of my (...)
There is some thing wrong with layout or decoupling, because some of the output power is getting into the input circuitry. So make sure that the Vcc is properly decoupled from SHF down to AF, put a screen between the input and output which is earthed. It would help if we knew what the design frequencies was and the oscillating frequency. Fra
hi I want to learn and design professional High Speed PCB Boards for FPGA etc. I have a work experience on Orcad 16 layout 16 and have designed RF Power amplifier PCB's up-to 2GHz using ADS. What are the leaning steps involved and which tool is required (Altium, PCB Editor etc)? Do i need to follow any book on Signal Integrity? Regards
i have schematics of my circuit in ADS. its a distributed amplifier which has complex structure. i replaced all the interconnects with MLIN and termination with port. however when i click Generate/update layout, only 3 interconnections are generated! please help!
Dear All i have design a transconductance amplifier. done with layout of it.. cleared DRC and LVS and PEX. in PEX i m getting some warning. i m not able to understand those warning but because of these warning i m able to generate config view. i m attaching the error file
Which connector switch Sleeve? You are wondering why DC ground current causes ground noise? with 50mOhm spec @1A or after aging? or with low level signal or with inductive grounds and unshielded connector and signals? Pls show your problem with photo of layout and scope trace. ( assuming 2.5 or 3.5 mm stereo with Gnd switch )1
try 10 pf across R3 or R4.. assuming low inductive layout and R6 is not WW.
The MOSFET IRF510 can use a simple voltage divider for gate bias. For just 2W output power you don't need smart bias scheme. Very important for these kind of MOSFETs is the bias decoupling network and its grounding designed on the PCB layout, otherwise the transistor get unstable. Don't forget to isolate the drain from the heath-sink. Set initial f
You don't know the layout of the transistor internally, so I'd connect the emitter resistor between the 2 emitter pins as close as possible.
Hi Vadim - There are several different "layers" to the design of switches - are you asking about designing at a schematic level, or layout level (metal/via layouts to achieve low Rdson and satisfying EM rules, sense device design, bond pads locations, etc.), or basic device level (doping profiles, process integration, optimizing resistance vs bre
It is not a good idea to test the switch mode power supplies on bread board, unless you are expert in power electronics. High frequency switching currents creates lot of noise and spikes in ground. PCB with good layout is recommended.
I'm working on a video amplifier circuit using a LMH6703 (the SOT23-6) package, this is a fast (1.2GHz part). The reference board for this part LMH730216 has the bulk decoupling capacitors on the top side, however the smaller 10nF decoupling capacitors are placed on the back side with the +ve side passing through a via. There is plenty of sp
Hi guys. I have to design the layout of the above mentioned ota. I am thinking on how layout the ota AMP. This OTA has PMOS input transistor. What I was thinking to do was to follow the schematic. That is: Interdigitize the cascode transistores that bias the diff. pair. Interdgtz the differential pair. Interdgtz the current mirror lo