What is a single sideband mixer?
Single Sideband (SSB) mixers allow a user to upconvert a signal onto a carrier while suppressing the same image frequency signal, relaxing transmitter filter requirements.
How image Rejection mixer works?
In order to be able to operate, image reject mixers, image rejection mixers utilise the phasing techniques to cancel out the unwanted mix products. To achieve this an image reject mixer utilises two balanced mixers and the quadrature (90°) hybrids as shown below.
What is IQ mixer?
An IQ-mixer consists of two balanced mixers and two hy- brids. It provides two IF signals with equal amplitudes which are in phase quadrature. These devices play an in- creasing role in the processing of high-frequency signals, especially as modulators and demodulators.
What is the difference between double side band DSB and Single Side Band SSB noise in mixers?
A double-sideband (DSB) signal contains both upper and lower sidebands, as in (7.3), while a single-sideband (SSB) signal can be produced by filtering or by using a single-sideband mixer.
What is a good image rejection ratio?
Image rejection ratio IMRR is measured in dB, giving the ratio of the wanted to the unwanted signal to yield the same output from the receiver. In a good design, ratios of >60 dB are achieveable.
What is a double balanced mixer?
The double balanced mixer is a diode bridge mixer that uses two single-ended to differential transformers, or baluns, to create the multiplication of two input frequencies and cancel many of the unwanted harmonics and signals.
What is difference between RF and IF?
RF to IF conversion is achieved using a RF device called Down-converter. Heterodyne and homodyne receiver architectures are used to convert modulated RF signal to IF signal. Superheterodyne uses 10.7MHz as first IF and 470KHz as second IF….RF vs IF.
| Type of application | Intermediate Frequency value |
|---|---|
| Radar | 30MHz |
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.
Is SSB better than DSB?
DSB-SC – Double SideBand Suppressed Carrier Hence it needs two times the bandwidth of SSBSC as explained later. It has advantages of having lower power consumption but needs complex detection at the receiver side. DSBSC modulation technique is used in analogue TV systems to transmit colour information.
What are the disadvantages of SSB?
Disadvantages of SSB over full carrier DSB wave
- The generation of SSB is quite complex as the suppression of one of the sidebands is difficult.
- The generation of SSB requires sharp cut off characteristics of the sideband suppression filter.
- SSB receivers require more precise tuning than DSB.
Who uses single sideband?
SSB (Single Sideband) is an obscure but very important way to communicate via radio. It is used primarily for two-way voice communication by ham radio operators, aircraft and air traffic control (ATC), ships at sea, military and spy networks. Occasionally some shortwave broadcast stations use this format.
How do you choose frequency?
The choice of an IF frequency is one of those design tradeoffs. The lower the IF frequency used, the easier it is to achieve a narrow bandwidth to obtain good selectivity in the receiver and the greater the IF stage gain.
What is double spotting?
Definition: Refers to the practice of placing two, or more, commercials for a brand in a given program. Double spotting is often used as a means of building high levels of frequency within a short period of time. This is particularly so when double spotting is used in combination with Media Gardens analysis.
What is a triple balanced mixer?
Triple Balanced Mixers (also called Double Doubly-Balanced Mixers) have. three separate baluns for LO, RF and IF ports. This structure helps provide wide. bandwidth and good L-R, L-I and R-I isolations, return loss, compression and IP3, all at. the expense of 3dB higher LO power.
What are the benefits of using unbalanced mixers?
An unbalanced mixer, in addition to producing a product signal, allows both input signals to pass through and appear as components in the output.
Why do we convert RF to IF?
Conversion to an intermediate frequency is useful for several reasons. When several stages of filters are used, they can all be set to a fixed frequency, which makes them easier to build and to tune. Lower frequency transistors generally have higher gains so fewer stages are required.
What are single sideband (SSB) mixers?
Single Sideband (SSB) mixers allow a user to upconvert a signal onto a carrier while suppressing the same image frequency signal, relaxing transmitter filter requirements.
What is an image reject or single sideband mixer?
I Q and Image Reject or Single Sideband mixers use similar circuitry to solve two different fundamental problems in communications and signal processing.
What is the output voltage of a single sideband amplifier?
The end result (without additional filtering) is a suppressed-carrier, single-sideband, voltage output at –10dBm and 50-ohm impedance, at a frequency that is either the sum or difference of the LO and baseband signal, plus suppressed remnants of the LO and opposing sideband.
What is the difference between IQ mixer and SSB mixer?
When an IQ mixer is used as a downconverter it allows both of the original data signals to be retrieved with an appropriately phased LO signal. Image Reject (IR) and Single Sideband (SSB) mixer are different names for the same mixer, used either as an up or a down converter.