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US 9,077,306 B2Granted
Mixer having frequency selectivity
AssigneeTDK Corporation
InventorsYuji Kakinuma, Masato Takahashi
Life of this patent
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Abstract
In order to provide a mixer capable of extracting a high multiplication signal and which has a reception band-pass filter function, a magnetoresistance effect element is provided that includes a pinned magnetization layer, a free magnetization layer, and a non-magnetic spacer layer disposed between the pinned magnetization layer and the free magnetization layer. This allows for a frequency converter which implements a desired band-pass filter by controlling a magnetic field applied by a magnetic-field applying unit to be provided.
Claims8
A mixer comprising:
- a magnetoresistance effect element that includes a pinned magnetization layer, a free magnetization layer, and a non-magnetic spacer layer disposed between the pinned magnetization layer and the free magnetization layer, and that generates, in response to an input of a first high frequency signal S1 (frequency f1) and a second high frequency signal S2 (frequency f2) for a local signal, a multiplication signal by multiplying both the high frequency signals by each other using a magnetoresistance effect;
- a magnetic-field applying unit that applies a magnetic field to the free magnetization layer;
- and
- a frequency selective attenuator that exhibits frequency selectivity for the multiplication signal by using the maximum strength of the multiplication signal generated when a resonant frequency f0 of the magnetoresistance effect element is set to coincide with the frequency f2 of the second high frequency signal S2 for a local signal and when the frequency f1 of the first high frequency signal S1 is set to be near the frequency f2 and by using attenuation of the multiplication signal generated when the first frequency f1 deviates from the frequency f2.
1 more element
Dependencies are inferred from the claim text.