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48 Threads found on edaboard.com: 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.
Usually resistive fet mixers use balun transformers (microstrip baluns for higher frequencies), and they are designed to be terminated in 50
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