Filter circuitry
Circuitry for use in a direct conversion transmitting or receiving chains includes mixing circuitry which converts baseband signal to radio frequency or vice versa. A local oscillator to provide a signal having a first component and a second component at a harmonic of the first to the mixing circuit...
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| creator | KAUKOVUORI JOUNI KRISTIAN ELORANTA PETRI TAPANI RIEKKI JONNE JUHANI HEIKKINEN JARI JOHANNES KAUNISTO RISTO HEIKKI SAKARI |
| description | Circuitry for use in a direct conversion transmitting or receiving chains includes mixing circuitry which converts baseband signal to radio frequency or vice versa. A local oscillator to provide a signal having a first component and a second component at a harmonic of the first to the mixing circuitry. The circuitry has a filter circuit which attenuates signals output at a first frequency by an amount which is low relative and which attenuates signals output at a second frequency by an amount which is high, both being relative to the attenuation of signals output at frequencies other than the second frequency. The filter circuit is tunable to vary the frequencies, and configured such that the second frequency is maintained at a predetermined integer multiple of the first frequency. |
| format | Patent |
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A local oscillator to provide a signal having a first component and a second component at a harmonic of the first to the mixing circuitry. The circuitry has a filter circuit which attenuates signals output at a first frequency by an amount which is low relative and which attenuates signals output at a second frequency by an amount which is high, both being relative to the attenuation of signals output at frequencies other than the second frequency. The filter circuit is tunable to vary the frequencies, and configured such that the second frequency is maintained at a predetermined integer multiple of the first frequency.</abstract><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| subjects | ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TRANSMISSION |
| title | Filter circuitry |
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