What is the difference between mixer and multiplier

After filtering, the modulator output is given by:. This is the same expression as the output of a multiplier, except for a slightly different gain. This is not a simple case, so more analysis is needed. If we assume that the signal contains a single frequency, f 1 , or a more complex signal spread across the band from f 1 to f 2 , we can analyze the output spectrum of our modulator, as shown in the following diagrams.

Assume a perfectly balanced modulator without signal leak, carrier leak, or distortion, so that the input, carrier, and spurious products do not appear in the output. Inputs are shown in black or in pale gray in the output diagrams, even though it is not actually present. Figure 2 shows the inputs—a signal in the f 1 to f 2 band and a carrier at f c. Figure 3 shows the output of a multiplier, or a modulator, and LPF with a cutoff frequency of 2 f c.

Figure 4 shows the output of an unfiltered modulator but not harmonic products above 7 f c. At signal frequencies above Nyquist, things become more complex. Figure 5 shows what happens when the signal band is just below f c. It is still possible to separate the harmonic products from the ones produced by the fundamental, but now it requires an LPF with very steep roll-off. The required signals must now be selected by a band-pass filter BPF.

Thus, although modulators are better than linear multipliers for most frequency changing applications, it is important to consider their harmonic products when designing real systems. Brandon, David. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Difference between Mixer and multiplier. Status Not open for further replies.

ArjunSC Member level 1. Also can anyone help me on how to implement a Quadrature mixer using Transistors. They surely are available for HF. Take a look at Hittite: www. In both of them to approach our need we drive circuits to nonlinear area to produce the harmonic of input signal as a multiplied frequency of input signal in multiplier and to produce the intermodulation of input signlas in mixer.

This book includes both of these topics Frequency Multiplier and Mixer in different chapters, also you can find how to implement balance and quadrature balance mixer. Similar threads H. Multiplier and Mixer? Started by hebu Oct 6, Replies: 1. RF, Microwave, Antennas and Optics. What's the difference between mixer and modulator?

Is there something else that I should know? For most purposes a mixer is a multiplier. A frequency multiplier is a completely different kettle of fish. For example, a frequency tripler can be had by driving a transformer into saturation so that it outputs something like a square wave and low-pass filtering the result. A crossfader is made of two amplitude multipliers, in mathematics a liner interpolator of values from multiplying one signal and multiplying the other signal.

Strictly speaking, modulating a signal relates to a variation in an applied effect on a signal, whereas mixing is not generally related to effects, it's signal and volume control. Sign up to join this community.

The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. What is the difference between a'mixer' and a ' multiplier' used in modulation process? Ask Question. Asked 5 years, 6 months ago. Active 5 years, 6 months ago.

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