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48 Threads found on Fet Mixer
GaAs fets can be used for RF switches in a frequency range, from near DC up to about 20 GHz. fet resistive (passive) mixers are widely used for frequencies up to about 1 GHz. They have good port-to-port isolation and can be used also for up-conversion. At higher frequencies their insertion loss become to high, when compare to Schottcky diode (...)
At page 15 I found a good description of the quad fet passive mixer:
When using single fet as a mixer the best isolation that you can get is when using drain pumped LO. The diplexer in this situation is between LO and IF.
Firstly,I want a single gate fet model that can operate at 5.5GHz.I want to use it as a mixer.Also can anybody guide me which considerations should be kept in mind while biasing it.
NE25139 from NEC is a dual-gate GaAs MESfet which they claim that working at 4GHz. Might work as a mixer at 5.5 GHz, with less conversion gain. I have used for a 5.5 GHz application HMC218BMS8GE from Hittite (ADI). The price I think is about $6. The mixer is using single ended connection for all port
Hello all, I'm designing a single-fet resistive mixer, following Nonlinear Microwave and RF Circuits by Steve Maas. I don't have access to his Microwave mixers book, and am using ADS for the simulation. My fet is a NE3210S01, LO 12 GHz, RF 13-14 GHz, IF 1-2 GHz. I have a few points I'm hoping some of you might help me (...)
Many informations missing, e.g. frequency, fet type, magnitude and waveform of the demodulating signal. It looks like you have much crosstalk of original signal. May be a matter of fet Cds capacitance, missing bulk bias or unsuitable demodulation signal magnitude. I guess the "desired output" has been generated by using ideal switches or a behav
This is not a regenerative receiver. It is a Direct Conversion, using separate Colpitts oscillator, and a fet is used as a (Gate) Additive mixer.
There is no formula for LO power at the mixer output. This depends mainly by LO-to-IF isolation of the mixer, which depends by the type of the mixer (Single-Device, Single-Balanced, Double-Balanced, etc.) and by the technology used to build the mixer (BJT, fet, CMOS, etc).
Regarding initial question, usually in a dual-gate MOSfet mixer, on the gate-1 is injected the RF signal (lower level) and on the gate-2 is injected the LO signal (higher signal). This is related to the internal structure of dual-gate MOSfets. Meantime, the equivalent of a dual-gate fet mixer is to use two (...)
in case of single fet resistive mixer, wht is the relation between RF power and Conersion losses??
You need to have high enough LO power to turn the fets from full on to full off. Your 5 dB loss is quite respectable. Diode ring mixers are about 6 dB and the theoretical limit is about 4 dB.
hi ... i am designing a fet resistive mixer, i completed RF filter, IF filter and gate biasing the fet transistor. But i dont knw hw to design a matching network for Rf port and IF port. Please give me some idea how to design matching networks....
hi.... i am designing a fet resistive (single-gate)mixer, but i am unable to design balun please provide design information of balun and also about how to match input LO and RF ports..Please help me ...
Could anyone kindly give me an ADS sample design ? Dual Gate fet mixer. Thank you~~
why is the designing of a fet mixer which has LO fed at source difficult??? I've ead some papers which say tht it is due to instability...what is the reason fr tht instability?? could any1 clarify??? thnx...
hi..I have designed a source fed fet mixer...I am aware of the biasing region for this type of mixers...when I tested the designed mixer however, I found tht it gave lowest conversion loss at drain voltage almost 0 i.e. at 0.1 V. but I had designed the mixer for an operating point of drain voltage at about 2 (...)
hi..I have designed a source fed fet mixer...I am aware of the biasing region for this type of mixers...when I tested the designed mixer however, I found tht it gave lowest conversion loss at drain voltage almost 0 i.e. at 0.1 V. but I had designed the mixer for an operating point of drain voltage at about 2 (...)
I have designed a mixer to operate in 4-9 GHz range. but I've dne tht using a single fet ..the simulation results were not tht great but once I fabricated in microstrip the results were worse...the single fet device I am using can be used upto 20 GHz as per the question it even reasonable fr me to expect a gain or atleast a l
I have to design a down converter mixer for 2.4 GHz and 5.25 GHz WLAN bands..the IF is 300 MHz...and I am using a fet for mixing...everything else understood...what is the approach to design a dual band matching network...are there any references I can look up?? I've checked a lot of books and quite a few papers...none of them has really helped..w
I am designing a single fet mixer using ADS and I had designed the matching circuit at the required frequency by placing the smith chart matching smart component and designing the circuit using sith chart utility. the mixer was giving a decent gain for a single ended mixer during simulation. the next time I opened the (...)
If you don't know how to design a fet mixer and you need to design a fet mixer, then learn how to design a fet mixer. If you don't have any desire to learn how to design a fet mixer, then perhaps you should have taken enviromental studies, or economics.
hi everyone, who has experience in designing fet mixer please share it with me? Added after 4 minutes: i have read microwave mixer by stephen maas, nonlinear microwave by him too and microwave engineering by david pozar. but i not really understand. from nonlinear microwave book, 1st step is to es
dear friends, iam designing and implementing 5 GHz active fet mixer for my project...i have designed the mixer, but mixer gives no gain....can i send my ADS file to u that u can give suggestions to my problem...after wards i have to implement on the substrate...plzz... reply as soon as possible... thanking u.... (...)
You really should look at the signal levels at each stage of your design, a simple transistor mixer is where one sigal is applied to the base of the transistor and the other - modulating one is applied to the emitter. Other wise you could use a dual gate fet and use one of the gates to modulate the RF signal on that is present on the other gate.
i think to over come the spurs u need a highy linear mixer , may be a resisitive fet mixer Khouly
read Microwave mixers by steve Maas , this book is great it will give u a god start point about microwave fet mixers khouly
I don't think you can get IIP3 of 30 dBm of a resistive fet mixer, having only 0 dBm of LO drive level. You neet at least 15-20 dBm LO drive.
dear frns... iam designing mixer in ADS tool..., mixer designing was completed and implemented in ADS....applied RF and LO signals at input side , and it is single gate fet mixer .... problem lies is that .... i applied gate bias at gate , drain bias at drain of the fet & RF signal (...)
in single fet the LO 2nd harmonic will have an effect , and sure if ur filter is not good sure the output singal will be affected i agree with A Anand if the mixer is differetial , here the even harmonics will be minimum but in singel fet mixer this not ture khouly
i am doing a reciver mixer right now , the RF =7.3 Ghz the LO= 5 GHz , the IF = 2.3 the prblem is while the HB simulation , i have found that the 2 harmonic of the LO 10 GHz is mixing with the RF 7.3 and produce a signal at 2.7 GHz , which is comparable in power with the desired singal , i am using a single trnasistor fet mixer , (...)
i want to design a 7.5 GHz up coversion mixer with discrete schotky diodes or fet can someone recommend me a circuit , or topology to begin with , is single fet mixer can be used note the IF is about 2 GHz , and the carrier about 5.5 GHz khouly
everything is fet refer to the follow for introductory inf
1.) You can use dual gate fet to built an active mixer, the isolation is alright. An appnote is attached for your reference. 2a.) IF frequency of the mixer suppose to be unchanged. Therefore, you should change the VCO frequency ( normally control by PLL ) in order to keep IF coustant. This is what normally do for rf modules. b.) (...)
There ar many type of mixers. You have to be more specific: what type of mixer, Schottky diode, active, fet or what? Frequency range?
You are right, the non-linearity is in the characteristic of the device. Consider a fet mixer. The characteristic is a parabola (square-law curve). Therefore, a signal will be amplified by the fet (operating medium-signal): Vo=A*Vin+B*Vin^2 Notice the square term. If you have two signals applied to the mixer the (...)
You can also use an fet to make a mixer at Ku band. This is common for DBS LNB. Device you can use, as an example, NE3210S01. Linda
You might try a dual gate fet mixer at this frequency. THere is a zip file in this link. It is very useful. For self oscilating dual fet mixer It is a US patent
P -1dB used to be an output data for a device. IIP3 is an input data for a device. If your fet mixer has gain, than the situation you described may be normal. Try comparing OIP3 and P -1dB, g579
i am troubling in mixer design? in fet resitance mixer design process(only vgs apply on gate): Tone 1 applied to PORT2 defines the LO frequency and swept power(11.5ghz,14.9dbm,the power level should be optimized). Tone 2 applied to PORT1 defines the RF frequency and power(14-16ghz,-20dbm). PORT3 is if output(2.5-4.5ghz). before i design (...)
Hi All, i need to extract the g-values of a fet for mixer analysis. Basically, the transconductance is expanded as a power series with: Ids-Ids0=g0*(Vgs-Vgs0)+g1*(Vgs-Vgs0)^2)+g2*(Vgs-Vgs0)^3)+g3*(Vgs-Vgs0)^3....... Ids0=Ids at fet biasing point. Vgs0=fet gate bias volt. (assume common source (...)
Hi All, I'm using a MESfet as a self-oscillating mixer. Normally, i operate the fet at Vds=3v and Vgs=0v. However, when I turn down Vds =2V, gain of the IF actually increases.... what is happening? I can't seem to fit this behaviour to any theory since (when looking at ) Ids remains almost constant. Can't find info on g vs Vds behaviour (...)
Yes, is possible to design this kind of mixer, but is rarely implemented. In this case is preferable to use a BJT instead of a fet. BJT due to its impedances is easier to be matched. The most critical is the input matching circuit, that should not only match the RF source to BJT base-emitter junction, but must also provide an IF short circuit to
Hi, I have designed a relection, common source fet DRO at 6GHz. Making use of the existing design, I need to design for a RF (5Mhz) feed to convert the DRO into a self-oscillating mixer. I need some advice on how I can acheive RF input matching without affecting the oscillator. All the papers I found use SOM for down-convertion so the RF
The attached zip-file contains 1. A 3-V RF-CMOS dual-gate up-conversion mixer.pdf 2. A comprehensive design method for dual-gate MOSfet mixers.pdf 3. dualfet1.pdf 4. dualfet2.pdf 5. intermodulation analysis of dual-gate fet mixers.pdf 6. dual gate (...)
To Hello, In a CMOS double balanced Gilbert cell mixer, because M3 to M6 are operating as a switch, is baised at Vds = Vgs - Vt. M3 to M6 have the same devices characteristics(W/L , Cox and so on) and since 2 of the fet are operating at any time with their drain current being equal, their drain current is Iss/2. Iss being the current from Vdd.
What's frequency is limited for dual fet transistors today? I need dual fet for 6Ghz mixer, is there some manufactures with this request.
Hi All, Since Dual-Gate fet is a four-terminal device, the traditional model of S-parameter S2p is not enough to model the device. Anyone who have experienced on it because it is quite common employed in mixer design ? Best Rgs Rayengine