Method for forming an intermediate frequency signal in a mixer, and a mixer
AssigneeNokia Corporation
InventorsTomi-Pekka Takalo, Ari Viljanen
Life of this patent
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Abstract
The invention relates to a method for forming at least two intermediate frequency signals with different phases in a mixer (1), to which a first signal (RF) and a second signal (LO) are conducted. According to the method, the first intermediate frequency signal is formed by shifting the phase of the first signal (RF) and by mixing the phase-shifted first signal (RF) and the second signal (LO). The second intermediate frequency signal is formed by mixing the first signal (RF) and the second signal (LO). The phase shift of the first signal (RF) is performed in the mixer (1).
Claims19
A method for forming at least two intermediate frequency signals in different phases in a mixer (1), to which a first signal (RF) and a second signal (LO) are conducted, a first intermediate frequency signal is formed by shifting the phase of the first signal (RF) and by mixing the phase-shifted first signal and the second signal (LO), and a second intermediate frequency signal is formed by mixing said first signal (RF) and said second signal (LO), characterized in that the phase shift of the first signal is performed in said mixer (1).
A mixer (1), which comprises at least means (RFin) for conducting the first signal (RF) to the mixer (1), means (LOin) for conducting the second signal (LO) to the mixer (1), means (T1-T6, R5, R6) for forming a first intermediate signal of the first signal (RF), the phase of which has been shifted, and of the second signal (LO), and means (T7-T12, R7, R8) for forming a second intermediate frequency signal of the first and second signal (LO), characterized in that the mixer (1) also comprises at least means (Z1) for performing phase shift on said first signal.
A receiver (9), which comprises means (10) for receiving a first signal (RF), which has been modulated in the transmission step, means (16) for forming a second signal (LO), a mixer (1), means (RFin) for conducting said first signal (RF) to the mixer (1), means (LOin) for conducting said second signal (LO) to the mixer (1), means (T1-T6, R5, R6) for forming a first intermediate signal of said first signal (RF), the phase of which has been shifted, and of said second signal (LO), and means (T7-T12, R7, R8) for forming a second intermediate frequency signal of said first (RF) and second signal (LO), characterized in that the mixer (1) also comprises at least means (Z1) for performing phase shift on said first signal.
Dependencies are inferred from the claim text.