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Another attempt to explain the balanced modulator or ring modulator
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.
first: sorry for my bad english! i try to find a universal symbol for a modulator and a symbol for a demodulator. i found at Alternating current schematic symbols - Electronic Symbols that symbol for a demodulator: 59688 but i guess this is no
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.
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
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.
Hello! I'm design RF passive ring MOSFET mixer on nmos. I'm confused where to connect substrate contact? Maybe leave it open...
Your best bet is a diode ring mixer which can be purchased as a module. Use LC diplexers on all three ports.
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 (...)
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 (...)
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 (...)
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, (...)
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
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 guys, Is there anyone who has some material about triple balanced ring diode mixer or double double balanced mixer. Thanks all. Aware
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.
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
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.
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
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.
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 (...)