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57 Threads found on edaboard.com: Cascade Bandwidth
This is quite wideband and cascade connections may not give this bandwidth and power level. Instead of that, "distributed amplifier configuration" should be used. For this kind of amplifiers, there are lots of document and paper. But it's quite difficult to implement.
Hi everyone. Need some advice from you all. Basically when we cascade amplifiers we faced the problem of bandwidth shrinkage. Is there any way where i can resolve or at least reduce the bandwidth shrinkage. From the text books for example Franco and such we can find numerous formulas to have the widest bandwidth however (...)
my opinion is when a few limiting amplifier cascade together, the gain will increase from first stage to the last stage. As gain increase, the miller capacitance also increase according to formula cgd(1+A). This will form a even lower frequency pole as incresing stages, f=/2pi. RC. The output of the last stage will be the dominant pole or the firs
Deal all, I will design 14bit/24MHz sampling 2-2 cascade delta-sigma ADC,Where I should to be careful design rule?stability?or power consumption? About OTA design, How do many unity-bandwidth and settling time enough to satisfy? Design spec: resulation: 14bit input bandwidth: 1MHz Sampling speed: 24MHz OSR=12 Thanks a lot.
Hi all i am designing a driver using cascade of inverters to drive a large capcitance (20pf)! But the delay is too large beyond our requirements. The delay should be less than 4.5ns. the power is 1.5v and i use the p35(n35) MOSFET. So any other method to do the same thing? i use the UMC0.25u. i want to know if the p25(n
if there are n stages of amplification each with bandwidth = b what is the effective b.w of all n amplifiers in cascade?........ i found it as b.(2^1/n -1 )^.5......how?
very oftenly i was messed up by this question....how to find the differences between Cascode and cascade amplifier... LIST out some prons and cons of cascade and Cascode amplifier
they are not cascade or parallel in fact they are independent & we need to find a separate analysis of their bandwidth thankyou......
Hello, before I ask you my question I just wanted to say I am new at the board. So over to my question. I need some help to dimension a cascade circuit amplifier with the LM324. The circuit must fulfil the following values: - In Impedance = 25kΩ - Above frequency = 100Hz - Below frequency = 150kHz - Maximun gain = 40dB I have solve
middle stage final output images.el
Hi I can not see how large is your bandwidth. I have designed fully diff 2 stages op amp 1.8v has 500Mhz bandwidth. 61db gain and 64 degree phase margin. I use standard 2 stage op amp (no cascade). I think you can improve your bandwidth from 800Mhz to 1ghz
Hi, Is there anyway to do manual analysis of, say a quadrature hybrid to determine its bandwidth (as I was able to do in low frequency cmos circuits)? While discussing quadrature hybrid, Pozar writes " ... the bandwidth of a branch-line hybrid can be increased to a decade or more by using mutiple sections in cascade". Any analytical (...)
RF System Calculator This is a excel spreadsheet that analyzes cascaded stages in Receivers and Transmitters. The cascade analysis includes Noise Figure, Gain, intercept point, power input/output, SNR (in a given bandwidth), etc. A main signal can be present as well as a pair of interfering signals for analyzing off-channel IM3 rejection (...)
It is hard to make an antenna with this limited bandwidth. The better thing to do is to use an antenna with modelate bandwidth and then cascade it with a good bandpass filter. This will be better. Search for patch antenna structures. There are a lot of examples available
hi, If the ID and gm are fixed, how to determine transistor size and bias voltage of cascade output stage. thanks! Rose
high frequency probe is one high impedance voltage is designed for minimal influence to the circuit with a moderate bandwidth.If used with VNA,it will be very convenience to check cascade chain problem without disconnect the chain.
Well, the 110 dB gain, if at dc, is no problem. However, the 1 nF cap load will always make your ampflifier act as an integrator. If your target is high gain at high frequency, you have to use some inductors, and that will make it narrow-band. If your target is high Gain-bandwidth product, then you may try cascade. However, watch out the phase m
A 2 stage CMOS opamp is a operational amplifier which is made up of 2 amplifying stages in cascade. 2 stages are generally used to achieve high voltage gain and high output swing simultaneously, 1 stage is optimized for each parameter. You can have more stages in cascade to acheieve higher gain, but at the expense of reduced bandwidth. (...)
When designing band pass filter you must satisfy few criteries. First you must define 3dB pass band or ripple. Second, bandwidth where you define wanted attenuation. Third, chose filter type Butterworth, Chebyshew etc. Filter in your case 1k-8k can be passive or active what is easier to realize. Better design approach is to design low pass and h
Hi ! We use op amps in active filters because we can simulate the characteristics of RLC elements used in passive filters, using only resistors and capacitors and not inductors (no one kind of active filter uses inductor). More advantages are that we can give a gain to the stage (we can cascade several stages to increase and sharp the slope of
Hi, 1. The easiest solution (however expensive) is to design many filters and choose one of them depending on the bandwidth. 1a. If you are using an FPGA, there is no wastage of resources so you may load 6MHz filter instead of 4MHz filter 2. Try to find a cascaded filter structure and you may use only the required number of stages. hope
Hi I am not sure, but may help you. If sharpness of the filter is not important for you, design a FIR HPF and LPF filter with cutt of frquencies about your requested BPF center frquency and cascade them. Regards
Use the classical cascade calculation algebra and use the noise figure and gain as numbers (not dB). This formula works for all passive and active stages. Passive stages have the noise F as the loss value. A 3 dB resistive attenuator has a gain of -3 dB and a noise figure of 3 dB. Diode ring mixers usually have a noise figure that is 2 dB worse
Two LNA in RFIC is designed to handle 900MHz and 1900MHz. To get low noise, there is no way to use cascade LNA in RFIC.
Hello, How to do using the MatLab tools to Simulate Delta-Sigma SNR performance? If Delta-Sigma spec fllow : 1.cascade 2-1 Delta-Sigma ADC 2.Supply=3.3v OSR=64 Maximum Input Signal= 1V peak-peak input signal bandwidth= 500KHz~5MEGHz Sampling rate= 200MEGHz Dynamic Range= 90dB SNR= 75dB For OTA Design, How ma
You can use a cascade of LC structures to improve the bandwidth of your matching. I usually don't use the ADS Smith Chart tool to match, but I do the S parameter simulation to match a load. You can use the optimizator also. By
Hello I'm now designing a 5 stages 'cascade' Wilkinson power divider (bandwidth 0.5GHz -6.5 GHz) on RF-60A (Er=6.15, H=1.542mm)according to "A general design formula of multi-section power divider based on singly terminated filter design theory". With the value I calculated according to the specifications in my case, I can have exactly the
Hi everyone.I am sampling at 8000.This is the min sampling rate possible.I cant sample at rate lower than this in dsp tms320c6713.I want to implement a bandpass and a notch filter in cascade.If i change the sampling rate to 300 using decimation and interpolation i would be able to reduce the computations required. But on the other hand interpola
please show me the circuit of "Two decade BJT-OP AMP cascade inverting voltage amplifier". SPECIFICATION: only one BJT,One OP AMP UA 741 and a single power supply of 12v must be used. a 10K ohm load and an input signal will be connected via capacitors to the amplifier.The maximum voltage gain is about -500. Input impedance is about 600 oh
Hi Crazy_analog If your input frequency is such a low frequency, then your lock is ridiculous. If under your application, if u really need to use that, I prefer you add a cascade of frequency doubler to increase the reference frequency to increase the lock time.
HI,guys, I am a new comer for help. I am working on designing a bandpass SC filter. The specification are as follows: center frequency is 120K; passband 10K-15K(the bandwidth), passband gain 0-3dB;stopband 70K-80K(the bandwidth), and stopband attenuation >-60dB; I designed this filter totally according to the chapter 9 of Allen's book
If the noise figure of each block in the receiver is known, we can calculate the total noise figure of the system with the cascade noise figure formula. The calculation is based on the condition that all the blocks are matched to 50 Ohm. But this is not the fact! So the calulated result should be no sense. Any comment on my viewpoint?
hi , I got problem want ask all of you I 'm design a limiting amplifier that need 4 stages which is cascaded ,each stage is a differential pair . When i design each each stage to satisfy its gain and bandwidth i must choose common mode input also .But when all of stages are cascade ,the output common mode voltage of a stage will be (...)
I cascade two stages of UPC2776 as a post amplifier to boost the signal from a Transimpedance amplifier. Since UPC2776 have 23dB gain and 2.7GHz bandwidth and TIA supposed to work at 70MHz, it should not be problem from bandwidth point of view. The wired thing happened once I power up UPC 2776. Output of the second stage oscillating (...)
HI all, Can I design a Band Pass Filter Using cascade connection of LPF and HPF for a BW of 270K?(narrow BPF)
anybody can help me to find circuit that has TWO DECADE BJT-OP AMP cascade INVERTING VOLTAGE AMPLIFIER please help me as soon possible attach the circuit or any suggsestion to me..thanks title: Two decade BJT-OP AMP cascade inverting voltage amplifier SPECIFICATION: only one BJT,One OP AMP UA 741 and a single power supply of
A is better. For B: If load current = 0 than output transistor gate-sorce voltage is near threshold. In this case diff cascade works bad because right transistor is in saturation.
You can use cascaded sections of high pass and low pass circuit.
I?m looking at a design using a NPN cascade amplifier for good IP3. I read on internet that there is a rule of thumb in Sedra & Smith near page 536 that states, ?1/4, 1/4, 1/4, 1/4 biasing rule to set up bias resistors?. My copy of Sedra & Smith is dated. Does anyone have knowledge of this rule of thumb? I?m trying to decide how much Re and Vce
Hello all, I'm designing a fourth order filter by designing 2 biquad filters in cascade . can any one tell me how i can calculate the effective frequency band wo of the filter and also the effective quality factor Q based on wo, Q of each biquad section. If there is any PDF describe this phenomena this will be of a great help. Best Regards,
Lumped element method is the best solution. Use a high pass in cascade with a low pass to realize this band pass filter. Good luck!
Don’t use a two stage approach; you will burn too much current in the second stage. Unity Gain bandwidth = 500 MHz => for stability second pole should be around 1.5 GHz!!!!! Second Pole = gm(second stage)/(2*pi*Cload), believe me that will cost current. Normally a folded cascade should be enough to reach 75 dB, but probably not with that
The story of dimensioning the max bandwidth of an opamp is much easier if you start from the end. The opamp could not have more bandwidth than the output stage. The Gm/Cload of the output stage define the parasitic pole which could not be compensated or avoided. If the phase of the ouput stage reach -30° the unity gain of the opamp and the feedb
Nothing is easier. In other words: ask Yourself what really need. E.g. the total power radiometer do not require a sophisticate simulator. A very simple, cascade simulator, wrote in MS Excel is often enough. One of the key is the input power. The out voltage is: Vout = K(Tobs+Te)B G Gamma K : Boltzman
Would I just cascade the RCs? Rgds, IanP :D
Hello, I want to design 2-2 cascade delta sigma modulator for 2 mhz signal bandwidth, i must sum the two outputs given by the two stages, i use ORCAD PSPICE for similation, i need to implement H(z) =z^-1 which is a delay unit, i don't know the structure of this function using MOS transistors and how i implement it. Please help me
Friends, I am designing a GaAs LNA. Tech is WIN (Wireless Information Networking) 0.5um INGaAs pHEMT Enhancement/Depletion-Mode Device. The LNA requires variable gain from 0dB~18dB, P1dBin >-10dBm@18dB, 0dBm@0dB. And working frequency between 400MHz---900MHz. I tried many kinds of circuit, such as cascade with feedback (single stage), common so
Hi, you wrote >>> I know that the PLL can filter the low frequence noise itself,so the low frequence jitter of output maybe better than input. I think a PLL will filter high frequent input noise. The low frequent input is tracked. regarding your question. I think if you cascade multiple identical PLLs you will run into issues. At least i
This was upto 4MHz. I don't know why FvM is saying use discrete components. Do you consider, that there may be a difference between 4 MHz and 750 MHz? I any case, a filter different from a simple cascade of first order will need feedback. Then, also a gm-C filter has to struggle with stability issues. Thus I'm curious to see a 4t
Source degeneration is pretty consistent. A cascade of low gain stages can perform better than a smaller number of high gain stages when it comes to bandwidth and low- overdrive prop delay.