image frequency


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image frequency

[′im·ij ‚frē·kwən·sē]
(electronics)
An undesired carrier frequency that differs from the frequency to which a superheterodyne receiver is tuned by twice the intermediate frequency.
References in periodicals archive ?
The detailed AMOLED display features eight color mode options and a high image frequency for a fluid viewing experience.
Instead of a using a movable antenna, which measures the image point by point, one can use a larger number of antennas to obtain a video-like image frequency," says Holl.
The bandpass filters are used in the radio frequency receivers for suppression of the image frequency which results in improved noise figure, especially for parallel coupled microstrip lines filter which has many advantages, such as easy design procedure, wide bandwidth, planar structure, long-narrow aspect ratio and the ability to be placed axially rotated in the receiver channel [9,10].
For intention to compare ITF image frequency characteristics at first we measured ITF images of grain unimpressed by magnetic field.
The image reject mixer eliminates the need for an image bandpass filter after the ouptut amplifier to remove signal power at the image frequency.
To prevent such "image response," the receiver design almost always includes a filter to keep the image frequency away from the mixer.
The image frequency, bandwidth, and quality are user-selectable depending on the demands of each site.
The architecture is inherently simple and is not affected by image frequency interference.
The image reject mixer removes the need for a bandpass filter after the LNA to remove thermal noise at the image frequency.
Bullet-proof front end: IIP3 = -18 dBm at highest LNA gain and >5dBm at lowest LNA gain, IIP2 = +35 dBm, 80 dB Blocking Immunity, no Image Frequency response
The image reject mixer eliminates the need for an image bandpass filter after the output amplifier to remove thermal noise at the image frequency.
One SAW filter is used for each of the bands supported in a multi-band handset, to reject the image frequency at RF.