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I made a netlist of single ended diff amp but I am not getting right curve between input differential voltage and drain currents of differential pair mosfet M1 and M2. Can anyone tell me where I am wrong... .title'differential amplifier' .option acount=0 default acount=1 Vdd 6 0 DC (...)
1) what are your voltages? Supply, input, output. 2) You tell us p-p voltage, but what's common-mode voltage? You might be pinned up against your power supply rail. 3) HOW are you adjusting your gain? In the diff amp? In the second stage? 4) what is your frequency? AC coupling is not going to work very well below some frequency.
Working with signals close to the negative rail is the main reason to prefer a PMOS or PNP front end - either the diff pair itself, or source / emitter followers preceding it (then the diff pair could be N type). Single supply op amps of the normal sort are always PNP or PMOS (or, overlaid NMOS and PMOS in rail-rail input types, but the PMOS (...)
Any papers about this issue: high supply voltage but low voltage input diff pair is used in order to reduce size and to improve the matching issue. Thanks.
128912 1)first stage of 2 series diff amp. It says its level shifting. What level does shift from and to? 2)at the output stage, two inverter with their output tied together. What's purpose of that?
When i am doing slew rate analysis for a fully differential amlfier, at the output , i am not getting a proper rising or falling pulse, it's rising , falling and again rising. i tried to slove it by increasing the gain and UGB of CMFB, but it's not working. But by removing CMFB its proper. How the CMFB affects the slew rate of a fully differential
Below is a diff amp I am planning to use to read value from a capacitor. I will be using a saw tooth reference voltage and output will be high when vref>Vin else low. Problem is my input voltage is negative dc voltage. Can you suggest me how to change my circuit? .param + Lch = 500n + Wnsa = 300n + Wpsa = 300n [
1. generally we think the output node of the differential input stage is at the side of inverting input node. By this definition, since node 4 is at the same side of node 2, then node 2 should be "-", while node 3 should be "+". This is correct - for the usual definition of a positive ac signal output. From
Hello! After simulate this simple amp (all properly biased), I simulated the graph on the right hand side: Looks like for the low freqs, it's got a PSR of 0dB (ac disturbance in supply, measuring ac at the output). Isn't that weird? Doesn't 0dBs mean that transistor 3 acts as a resistor? Can someone explain to me the theory behind that? Could
I'm trying to design a fully differential IF amplifier in 0.5um On semi process, and its input referred noise voltage is going to be critical in the system's overall performance. The source impedance is low, in the range of 50-1000 ohms, so to keep NF<3dB I'll need vg on the order of 1-2nV/√Hz. The operating frequency range is around 200kHz-2
Rather than looking for a JFET input diff amp, start out with a single ended preamplifier stage with low noise and high gain, then do the differential conversion with a second stage amp which will have looser noise requirements. For such a wide bandwidth you'll have to compromise noise performance at low or (...)
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 (...)
You can use $fgets to read each file a line at a time into two strings, and then compare them. Do this in a loop until you hit the end of one of the files. You can use the $system command to execute diff on Linux or FC on Windows, but getting a result back from windows to know if the compare succeeded will take some scripting. Do yo
Hi, I need to sense a differential voltage of 2000mV and the source is very noisy. I think to use a Intrumentation amplifier, but I have two limits. The first is the supply voltage, I have 12V or less and 0V, not negative voltage. And the second one, is that I need to read this voltage with a DSP(3.3V). I though to add a 1.65V offset voltage
I have designed 5MHz bw 2stage CMFB diff amp. but i could not adjust the Phase Margin using R,C values for the compensation, in my case when i achive PM = 60 , bw reduces to 800kHz. is there any method to compensate this amp of BW 5M or 3MHz with enough PM. Regards, Safiya
Hi I need help with a relatively simple Analog design problem.... I have a differential signal that I am 'tapping' into. (It goes to another input impedance of my circuit must be high > 100kR). The characteristics of the signal are: amplitude can be 1vpp to 5vpp Offset is always positive (and the signal never goes negat
Dear all, can anyone explained me diff between voltage optimiser & voltage stabiliser. peaple giving optimiser effieciency over 95 percent while stabiliser is able to give only 80%.. what is special mechanism used..?? to increase the efficiency. if anyone knows lings pls mail
I am working on a highly linear differential amplifier design using cadence. please suggest the issue that must keep in mind while designing linear system Are you asking how to MEASURE resp. simulate linearity properties or how to DESIGN a diff. amp with "good" linearity?
microprocessors doesnt have any ROM or RAM and other peripherals , its just an IC having CPU inside. microcontrollers has a CPU, in addition with a fixed amount of RAM, ROM and other peripherals all embedded on a single chip. both are embedded where in both are combination of hardware and software. PC will have processor and controller as w
Hi, can anybody tell what is the difference between reset & restart in a microcontroller. please explain in brief.