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Hi friends, I am designing direct conversion receiver with mosfet ring mixer in RFIC project. For the reason of high P1db needed, mosfet ring mixer is connected to antenna directly. Carrier: 900MHz, LO:900MHz. My confused spots are as following: 1. Does the mixer need perform input matching (...)
Your easiest option is a diode ring mixer. at the bottom of the page are low level LO mixers you can use. Be sure to follow the mixer with a bandpass filter to remove the image at 65 MHz and the LO feedthrough at 75 MHz. It is best to put a 6 dB pad between the mixer output and the filter. Put the 1
If the ring diode mixer use two proper baluns transformers, this will provide a relative wideband 50 ohm input/output impedance (better than -10dB return loss) and do not require any additional matching (up to one decade). If the mixer use printed baluns, the bandwidth is smaller (up to one octave). In either cases can use additional (...)
Hello! I'm designing a diode ring mixer on LTCC for freq 1G to 5G. For balun I'm going to use a spiral transmission line balun but I don't know where to take IF signal. Because the balun doesn't has a center tap like in transformer balun. Could somebody give me an examle of using spiral transmission line balun for balanced diode ring (...)
Your best bet is a diode ring mixer which can be purchased as a module. Use LC diplexers on all three ports.
everyone,i want to design a mixer use two diodes,so i chouse ring hybire mixer,but i have some problem when designing it. 1.first,how can i deside the width of the circle and the radius. 2.what is the function of the two sector
Hi friend: The mixer using a ring directional coupler is a nice choice for UP converters, although you don't have a good OL rejection. Keep in mind however that one key point for a successful mixer design is to choose a suitable diode. Consult the HP web site. They have some charts to help you to choose a correct diode for your (...)
Are you asking for information on how to insure that the LOs for I and Q are 90 degrees apart? One trick is to use an analog diode ring mixer. Put one of your oscillators to the LO and the other to the RF port of the mixer. You should get 0 V out if they are 90 degrees apart. Make sure to measure the mixer output (...)
There is a system level thing to keep in mind with mixers. They are more distortion producing than amplifiers and you should block out your system so that they have the minimum signal level that allows your system to function. Usually, you put a bandpass filter in front of it and have only enough RF amplifier gain to set the system noise figure.
rat-race is ring balun.But what's the meaning of your "horse-shoe" mixer?
Sounds like a homework question. My favorite application is the diode ring mixer because it fools people who think it's a bridge rectifier. :twisted:
One thing that controls your design is if the 100 MHz or the 2.4 GHz signals cover a wide range of frequencies. You will have enough problems with mixing images as it is. Then with the feedthrough of a single balanced mixer things will be worse. Have you thought of a transformer-diode ring type mixer? To get rid of the feed through and (...)
Below you can see how to implement a balun in RFIC: Double balanced is common, but to improve linearity, one of the most used mixer in WLAN and Bluetooth is ring passive mixer (Folded Switching mixer), using four FETs.
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
Here's the operating/service manual for a classic old HP 10514A/B mixer. The Theory of Operation section (page 12) describes the diode ring modulator. It's a PDF file, about 1.6 megabytes. This link will probably disappear in a few days.
FYI. If the sinput sigal is a periodic one, there is a simple way to convert its rms value to DC describing as following: Employ an AC amplifier to amply the input signal to make sure the output level is above 0.7v, higher amplitude is better. The amplified large signal then is fed into a diode ring mixer as a local oscillator(LO). The input si
A mixer is not a sampler. A square wave make an excellent LO - it essentially toggles the polarity of the RF signal. This provides higher conversion gain, lower noise, and lower LO feedthrough than if you used a sinewave LO. That's why high-level diode-ring mixers perform so well. The LO sinewave gets clipped into a square wave.
Hi guys, Is there anyone who has some material about triple balanced ring diode mixer or double double balanced mixer. Thanks all. Aware
What type of discrete mixer is suited for wideband mixing. I thought about a diode ring or a MOS switch. I dont have access to integrated mixers like Mini circuits and similar. I read about the performance of the single and double balanced modulator and built a double balanced mixer. The main problem was the transformer (...)
Hi friend I want to design Rate race mixer in ADS. The ring is 1.5lambada in circumference. but i don't know how to use that Mcurve bend. How to set the radius & angle to get perimeter of 0.25*lambada(lambada by 4) & 0.75*lambada? I do not find in ADS help. waiting for your replies Abhishekabs
For several decades, IFM (Instantaneous Frequency Measurement) systems have relied on the delay line discriminator circuit. You can assemble something fairly simply from components that you can buy from MiniCircuits. First of all put your signal through a limiting amplifier then drive a power divider with the output, one leg of the power divi
Hello, I need to design and fabricate a single balanced rat- race mixer with two schottky diodes. The down conversion is from 2.5GHz to 100 MHz. I have already got the hybrid ring to work. I have a couple of problems. How do i simulate the hybrid ring along with the diodes on ADS schematic? I know that we need to use harmony balance, (...)
hello all, i'm student i have to design mixer in ADS: pls, could you help about designing microstrip mixer based on diode... what should can i use : 90 ° hybrid ring or BranchLine Coupler !!
Hello! I'm design RF passive ring MOSFET mixer on nmos. I'm confused where to connect substrate contact? Maybe leave it open...
In fact using a mixer as a modulator you can get only an AM modulation. In your case you can get an AM signal with suppressed carrier or a DSB (Double Side Band). You can visualize the DSB IF output of your modulator using a standard analog oscilloscope. The waveform should look like in the attached picture. The diodes in your schematic are w
Any nonlinear device, such as a transistor driven with large signals or diodes will produce mixing products. The advantage of using the diode ring is that the RF and LO signals are almost absent from the output and thus less IF filtering is needed.
I am getting an unclear voice sounding on the general purpose wide band receiver when I transmit with the 40M transceiver that I built, and sometimes the signal isn't there at all. Could that be becaause I used silicon diodes (1N4148's) instead of germanium ones in the mixers (diode ring modulators)?
the problem I am facing is I am not able to construct DSB DBM ring diode mixer , mostly I found in the internet using FET which I do have a good examples on themDesign of DBM ring diode mixer is easier than design of DBM ring FET mixer. I can't understand what you are embarassing.
Does it matter if the local oscillator amplitude on a mixer input (about 9Vpp) is greater than than the IF on the other mixer input (about 3Vpp)? It is a diode ring modulator.
check this one if helpful ---------- Post added at 17:02 ---------- Pre
Yes, a diode ring can be used. I guess that the generation can be optimized with some phase difference between LO and RF inputs. For example, if RF would be square wave, it should be in quadrature with LO for maximum efficiency (if they are in phase, the 2nd order product would cancel). As another possibility, you can use a push-push configuration.
The LO power is independent of which output mixing product you use. It is set by the technology of the mixer circuit. In general, diode ring mixers require more LO power than active mixers.
I want to design a mixer I used ratrace and designed it in ADS so it will work good enough @1.95Ghz ( the average of LO and RF) now the next step is connecting diode and ... I have some basic idea. I read Maas book. For example I will use Microstrip Radial Stub to get rid of LO and RF a
Or it could be the type used in Ham/CB microphone plugs although it lacks the locking ring. It could just be a 7-pin 270 degree DIN connector, an in-line socket type. If DOD are still around it would be worth checking with them. From the pin sizes I would guess they are only rated at about 2A so that gives you an idea of the power requirements.
The cheaper minicircuits diode ring mixers allow bidirectional conversion. Look at the circuit to make sure there are only two tansformers and four diodes. The main problem if you use low side mixing is the large number of mixing products in band. If you can, use high side mixing. That is, make the LO frequency be the sum of the two frequencies
To maximize linearity, use a mixer with a high IMD intercept point and a high 1 dB compression point. Then make sure that your signal is much lower than these levels. The optimum point is 2/3 of the way up (in dB power) from the noise floor to the IP. This also applies to all amplifiers, RF and IF in the signal path. You will need to be very car
I think don't forget ohmic law, IR drop, ground bounce due to inductance. On chip isolation, take care the guard ring, even the seal ring alos makes issues. Identify the blocks which are sensitive, noisy..etc.
A ring oscillator in general can help you with that range.If not,you could further use mixer to generate the frequency that you want.
Hi guys, When designing the ring osc in PLL, I read a paper who mentions that: making the waveform be as symmetric as possible will help reduce the 1/f noise up-conversion. How to understand this topic? would you pls give me any hints? Thank very much.
Hi, There is a very simple FM receiver, called (super) regenerative which includes only one active device at its input and gives demodulated audio at its output, and includes an audio amplifier IC for speaker or headphone usage. Here is a link for it: And here is another unusual b
You should check the equipment, e. g. mixer where you want to connect the microphone. There isn't a clear standard for using TRS at microphone inputs, to my knowledge. It is for stereo audio, also for send-return cables. Some equipment may require the ring shorted to the sleeve for microphone inputs, this may decrease noise supression with others.
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.
The Diode ring Modulator has the same symbol as the Diode ring Demodulator.
A phasorial picture helps to see the effect. Think in an ideal envelope detector (regardless of diodes or circuits, but a mathematical model): At high SNR, the quatrature component of noise practically does not change the modulus of the phasor. The variations in ampitude fo