H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/18 (2006.01) H04B 7/19 (2006.01)
Patent
CA 2739959
A device for double frequency transposition, comprising means for controlling the frequencies F OL1, F OL2 of a first and a second synthesizer, which are adapted to carry out the following steps: ~ Initializing the frequency F OL2 at a first given value F OL2,A, ~ For a given pair of frequencies F RF, F F12, determining the frequency F OL1 with the aid of the following relations: .cndot. If F RF > F OL1 and F F11 < F OL2, F RF = F OL1 + F OL2 - F F12 (5), .cndot. If F RF > F OL1 and F F11 > F OL2, F RF = F OL1 + F OL2 + F F12 (6), .cndot. If F RF < F OL1 and F F11 > F OL2, F RF = F OL1 - F OL2 - F F12 (7), .cndot. If F RF < F OL1 and F F11 < F OL2, F RF = F OL1 - F OL2 + F F12 (8), ~ If the value obtained for F OL1 lies in a frequency band of lower bound A.F REF - B.X and upper bound A.F REF + B.X, where A is a strictly positive integer and X is a given parameter, modifying the frequency F OL2 to a second value F OL2,B determined so that the difference in absolute value between F OL2,A and F OL2,B satisfies the following two conditions: ¦F OL2,B - F OL2,A¦ > AF REF + 2B.X ¦F OL2,B - F OL2,A¦ < AF REF - 2B.X ~ Transmitting the frequency values F OL1 and F OL2 to said frequency synthesizers.
Marks & Clerk
Thales
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