Questions tagged [mixer]

A mixer or frequency mixer is a nonlinear electrical circuit that creates new frequencies from two signals applied to it.

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Generating DC signal using a phase detector

I can generate a DC signal using a splitter and a phase detector. I do this by splitting a signal to two and then mixing them in a phase detector (I can also use a mixer as well for this purpose). By ...
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5 votes
2 answers
97 views

Audio mixer comments/concerns

I'm trying to design an audio mixer for my friend, and he only needs three stereo channels with volume for each channel as well as a master volume. Additionally, he'd like as high an audio quality as ...
2 votes
2 answers
233 views

Determining LO drive voltage for 13dBm mini-circuits mixer

I am interested in using the following mixer by mini-circuits: RMS25-MH+. In the datasheet it is specified that the required LO drive power is 13dBm. As i understand it double balanced mixers use ...
0 votes
1 answer
38 views

Mixer noise calculation

It is not clear for me how a mixer generates noise. Lets say that we take an up-converting mixer there is certain white noise level at LO input - \$N_{LO}\$ and a certain level of a white noise at RF ...
7 votes
4 answers
1k views

What's the purpose of the band-pass filter in an RF transmitter?

What is the purpose of the marked band-pass filter?
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1 answer
56 views

Relation between signal mixer and filters

Mixer output shown as red wave: Can a band-pass filter be used to remove the low frequency shown as a blue sine wave and leave the rest high frequency just like the frequency shown as a green sine ...
1 vote
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52 views

Clarification on I/Q Mixer output

I'm working on RF Receiver, it is required to use I/Q Mixer for IF downconversion. Specification as follows below ...
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0 answers
29 views

IQ mixer LSB and USB image rejection and conversion loss

I am trying to test the rejection and conversion loss of the HMC1056LP4BE IQ mixer. I set the LO to be +10dBm @8.5GHz, IF1: -10dBm @250MHz, IF2: -10dBm @250MHz. Here I am using 3 different ports of a ...
0 votes
4 answers
104 views

FM transmitter won’t work. I need help with more gain, and current at the output

I am trying to make an FM transmitter circuit using cascaded transistors. My two input signals are from a microphone and from an 80 MHz crystal. I’ve calculated a gain of 22 from the first stage and ...
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1 answer
73 views

Mixer design : IF is +/- DC volts, local oscillator is cosine 9.6 kHz

I am working on a mixer which will be used for 4QAM, QPSK. The local oscillator is 9.6 kHz and the IF would be + or - 1 volt DC in order to have the RF port output either cosine or -cosine. Which ...
3 votes
3 answers
204 views

Cost-efficient mixers and/or demodulators for low frequencies

I am working on a circuit project where I need an in-phase/quadrature mixer for acoustic signals in the range of 200 kHz. I have seen that there are a lot of ICs for radio frequencies that implement a ...
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2 answers
120 views

Why does the IF of an RF mixer not go down to DC?

Consider this mixer: “SMA Triple Balance Mixer RF/LO Freq. 6-18 GHz IF Freq. 2-8 GHz” If my RF is 18 GHz and my LO is 17 GHz then the IF should be 1 GHz. But the product somehow has a minimum of 2 GHz....
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2 votes
1 answer
117 views

Help in smoothing signal output from a frequency mixer

I have a circuit with a TFM-3MH+frequency mixer. I need to output a low frequency signal of 10-100Hz. The signals that I'm sending to the input ports from a signal generator are: Sine wave of ...
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2 answers
264 views

Where to add equalization in active audio mixer?

I want a 2-input summing amplifier where I can adjust the amount of signal from each source with a single potentiometer. I intend to hook up two microphones (Shure SM57 and Audio Technica ATR 1500, ...
-1 votes
1 answer
37 views

Need to mix an audio signal from a low power device, into a high power speaker

Basically, I want to take a cable going from the car audio amplifier to a speaker which is sending around 50W of power, that cable, and put a mixer in there, where I will inject an audio signal that I ...
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1 answer
110 views

Overall Gain for Mixer Circuit

I am working on an audio mixer circuit for balanced studio gear. The circuit consists of two unity gain balanced line receivers (THAT1200), going into a pair of voltage dividers controlled by a shared ...
3 votes
2 answers
589 views

Impedance transformer, how to measure

I am preparing to do some RF mixer experiments with the SA612 Gilbert cell mixer. I started out with the impedance matching as I understand that the input and output need to be matched. From what I ...
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1 answer
48 views

Separate "voltage dividers" for multiple AC sources

Say we have two AC sources in a circuit. Is it possible to create separately control the output coming from each source using voltage dividers? (No op-amps) E.g. So that you have $$V_{out}=aV_1+bV_2$$ ...
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1 answer
135 views

Is there a simple fix for summing 2 AC signals?

I have seen many mixer schematics. They are pretty much always the same - a stack of resistors. Even some DJ mixers using the SSM2164 simply joined outputs followed by an opamp. The same thing always ...
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2 answers
90 views

Measuring the amplitude of a nV signal of known frequency and phase using AD633

I am wondering if there is a circuit to measure the amplitude of a sinusoidal signal of known frequency and phase that is induced in a pickup coil. The amplitude would be in the range of 0nV to ...
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2 votes
1 answer
248 views

Building a matrix audio mixer

I'd like to build a 4 in, 4 out, 9 V powered audio matrix mixer. Basically it's a mixer where each input has a knob to control the amount sent to each output, effectively forming a routing matrix, ...
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0 votes
1 answer
135 views

Minimum RF power for usable operation of mixer

I am working on some down conversion process. I will have an LO of 410 MHz, an RF of 400 MHz. And I will use MAX2682 400-2500 MHz downconverter mixer IC from Maxim Integrated. LO power will be about 2 ...
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RF signal detection vs mixer and amplifier noise

What I am trying to do is some sort of amateur radio. But not exactly a radio, for now I will just detect the presence of a signal. I will synthesize an RF signal with a frequency synthesizer, ...
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0 answers
73 views

Using diy lm386 preamp on standard commercial amp?

I have a small intercom-like device that has been siting around. It looks something like this. I suppose that inside is just a basic elect-mic and a button. Also i have an power amp which i used to ...
1 vote
1 answer
224 views

Stereo channel strip based on NE5532

I want to build a stereo channel strip, using the NE5532 IC. It should feature 2 mono inputs with volume control, mute switch and pan control going to a stereo output with unity gain. In the schematic ...
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0 answers
56 views

Analog mixer design help choosing between 2 states

I have designed 2 types of mixer an additive and a substractive one: The additive one is a practical application of Millman's theorem connected to an opamp: simulate this circuit – Schematic ...
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191 views

Design of a Frequency Mixer

I am quite new to this subject. I want to design a frequency mixer to mix a carrier frequency of 100 MHz with a 20 kHz signal. I found the attached circuit. It seems quite a simple circuit to multiply ...
1 vote
2 answers
143 views

Why does my summing mixer max out at 5.39V when my rails are roughly +/- 11.7V?

I've been working on this project to sum and scale DC voltages from 2 sets of four 0-5V variable voltage dividers, into two separate mixes with identical circuits. In my previous version, I fed the ...
0 votes
2 answers
74 views

Transient DC current on mixer output

I have an audio mixer with the following circuit (I omitted the input stage): I removed the mono instrument output and used the jack connector as an alternative line-output. However, while doing so, ...
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2 answers
67 views

What are the capacitors between the IN and OUT pins of a TDA7318 mixer chip for?

Fiddling around with my TDA7318 mixer chip, I've found a strange contradiction between the suggested "test circuit" cited in the manufacturer's datasheet, and the schematic published by ...
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1 answer
309 views

Difference between a frequency synthesizer and a frequency mixer

I have tried looking a couple different places but cannot find a concise explanation on the difference between a frequency synthesizer and a frequency mixer. My goal is to take a signal at 915 MHz and ...
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0 answers
80 views

Single balanced mixer, multi-tone analysis

I realized the circuit shown below on ADS. Schematic of the mixer can be shown below. As can be clearly seen from the figure below, to perform a multi-tone analysis RF signal is feeded with two ...
0 votes
1 answer
495 views

Significance of the center-tapped transformers in mixer circuits

How does center-tapped transformer work on the circuit given below? In analog rectifier circuits, one of ports of the center-tapped transformer is connected to a sinusoidal source while others are ...
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2 answers
168 views

555 timer Theremin - capacitor choice, and question about mixing signals

I'm trying to create 555-timer based Theremin, but I have a few questions that I don't quite understand. For now, I'm building it on a breadboard (yes, I know it's not the best option), but I don't ...
0 votes
1 answer
117 views

Switched capacitor sample and hold circuit as as mixer

I am trying to find out how important the "hold " level in a sample and hold down-conversion mixer is. If the level is decreased, will it lead to any loss? Out of these three subfigures, ...
1 vote
1 answer
260 views

How to select resistor values for passive mixer

Total newbie question: I wanted to buy a passive audio mixer, and I wanted it to be cheap. I picked up one of these in a hurry, only to realise that it's a switch. But hey, it's cheap, so let's make ...
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0 votes
1 answer
235 views

Mixer LO to IF Isolation vs. 1*LO - 0RF Spur

I am working on a simple digital radio receiver and am confused by the difference between the LO to IF leakage vs. the 1LO - 0RF spur. These two tables in the datasheet of the Analog Devices HMC218B ...
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0 votes
1 answer
328 views

How to make a two channel mono mixer with in balance control into stereo output

I wanted a circuit I thought was a basic pan control, but after mapping it out it wasn't so standard after all. The final design will have this exposed: two mono inputs (left and right), one stereo ...
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0 votes
1 answer
77 views

How could I create mixed audio, with a single PWM output?

Background: I recently made a project which emits pure tones on a speaker, and it got me thinking about how I was restricted to simple pitches. How would I simulate a chord if I can only play one ...
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4 votes
1 answer
274 views

LM393 comparator misbehaving and causing issues

I've been stuck on (what seems to be) a very unusual issue with a little audio circuit I’m designing. I wonder if anyone here can quickly highlight the flaws of my design and/or offer an insight into ...
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2 votes
1 answer
220 views

Feasibility of rat-race as RF mixer without active devices

My understanding is that RF mixers generally use some sort of active device (sometimes diodes) to produce output rich in harmonics, and rat-race couplers can be used to get the sum or difference ...
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0 answers
92 views

What does it mean to short circuit a transmission line stub at a specific frequency?

I'm currently designing a microwave FET mixer right now, and I have to short-circuit the FET's drain at LO frequency and its harmonics. I've checked the "stub" article in wiki, and it says ...
0 votes
1 answer
66 views

Question of possible circuit

Suppose we have an alternating signal and another signal is produced in the loop which is DC. Is there a circuit which tracks down the DC signal even if it is mixed with an AC signal?(somehow removes ...
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1 vote
1 answer
297 views

Two-channel passive audio splitter

I have a Scarlett Solo like the one above and I need a way to split the output of the mix board's auxiliary output into two level controlled signals. This Scarlett puts the instrument on the left ...
2 votes
0 answers
101 views

Audio mixer on battery power

I have an audio mixer which can run on two 9V batteries in series. I'd like to run it off a single 12V supply. Can I use two 12V-9V DC-DC converters both running off a 12V battery? Will the ...
1 vote
1 answer
100 views

Trouble designing and understanding lowpass filter in analog (mixer) phase-locked loop (PLL)

I'm trying to design a software-based PLL that mimics the behavior of an analog PLL based on a 4-quadrant mixer as the phase detector (PD). The input signal is a sinusoid of unknown frequency between \...
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2 votes
2 answers
50 views

Questions regarding an upconverter topology (beating behavior, P1dB and compression)

This following diagram is taken from the textbook “RF Microelectronics” by Prof. Razavi. The following points are my understanding about this upconverter topology: There are two mixers in this ...
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Questions regarding an upconverter topology (biasing network and small overdrive problems)

This following diagram is taken from the textbook “RF Microelectronics” by Prof. Razavi. I have a number of questions regarding this upconverter topology. Q1 How can we tell from this upconverter (or ...
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239 views

How to simulate commercial Double Balanced Mixer in ADS

I need to simulate ADE-1 from the Mini-circuit in ADS. I use this circuit simulation in ADS. . My RF source (P_1Tone) and Lo source, in reality, generate a 2dBm and 10dBm sinewaves. However, in ...
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0 votes
1 answer
111 views

How to send this signal to a mixer?

I have the receiver which works when I wire a Hifi on the output. But when I try to send the signal to the port 2/3 of the following mixer then I don't have any signal anymore. I guess I need to ...
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