What is linearity in mixer?
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Mixer linearity greatly influences receiver sensitivity in the presence of blocking sig- nals which if they are mixed with the signal of interest, as occurs in any nonlinear system [10], may end up in the signal band thus lowering signal to noise and distortion ratio (SNDR).
What is a complex mixer?
The Complex Mixer consists of a Numerically Controlled Oscillator (NCO) and a complex multiplier. Complex IQ data is received on the input port and is multiplied with the output of the NCO and put on the output port.
What are the basic characteristics of mixers?
The essential characteristic of a mixer is that it produces a component in its output which is the product of the two input signals. A device that has a non-linear (e.g. exponential) characteristic can act as a mixer.
What is LO feedthrough?
▪ LO feedthrough will occur from the LO port to IF output port. due to parasitic capacitance, power supply coupling, etc. – Often significant since LO output much higher than RF signal. ▪ If large, can potentially desensitize the receiver due to the extra. dynamic range consumed at the IF output.
What is harmonic rejection?
Recent broadband receivers utilize a harmonic rejection mixer to reject LO harmonics within the downconversion mixer and prevent interferers from being downconverted to baseband.
What is passive mixer?
A passive mixer is an audio mixer that doesn’t require any power because it doesn’t have an amplifier. It’s a circuit of audio jacks with potentiometers that are wired up to let the audio input signals flow to an audio output.
What does an RF mixer do?
An RF (or IF) mixer (not to be confused with video and audio mixers) is an active or passive device that converts a signal from one frequency to another. It can either modulate or demodulate a signal.
What is a balanced mixer?
A balanced mixer uses a four-port hybrid junction as shown in Figure 10.2. The LO and RF signals are applied to the two ports. Diode mixers are in each of the remaining two ports. At one diode, the sum of the RF and LO signals appears, and at the other diode is the difference of the two signals.
How do mixers work?
The mixer is the central hub where sound signals from different sources are combined and mixed. Effects and ambience can also be added, EQ and stereo imaging are balanced and then the output is directed to the monitor speakers using the mixer.
What is the output of a mixer?
The main output from most mixing devices is a stereo output, using two output sockets which should be fairly obvious and easy to locate. The connectors are usually 3-pin XLRs on larger consoles, but can also be 6.5mm TR (jack) sockets or RCA sockets.
What is meant by LO leakage?
The local oscillator (LO), which drives the mixer, has leaked to the mixer’s output port. There are also other paths for the LO to leak to the system output, such as through power supplies or across the silicon itself. Regardless of how the LO leaks out, it can be referred to as LOL.
What is RF leakage?
What is RF leakage? Signal leakage refers to the loss or egress of radio frequency (RF) signals from a cable system when they are not properly contained. This can result from a multitude of causes but is generally the result of shielding defects within the cable network.
What are the types of RF mixers?
This can limit the frequency response. Active mixers: As the name of the Active RF mixer contains active electronic components like a bipolar transistor, FET or even a vacuum tube / thermionic valve. These types of RF mixer are able to provide gain as well as proving the multiplication or RF mixer capability.
What is the difference between RF and Lo in a mixer?
There are three, and on many frequency mixer modules, they are labelled as such.: RF: This is the input used for the signal whose frequency is to be changed. It is typically the incoming signal or equivalent and it is normally at a relatively low level compered to the other input. LO: This is for the local oscillator signal.
What is RF or non-linear mixing?
The process of RF or non-linear mixing or multiplication is used in virtually every radio set these days and also in many other circuits beside.
What are the different types of mixer circuits?
There is an enormous variety of different types of circuits including: Single diode mixer: This form of RF mixer or frequency mixer is the simplest form available, using very few electronic components.