| US 7,414,443 B2 | ||
| Frequency multiplier | ||
| Harald Jacobsson, Västra Frölunda (Sweden); and Thomas Lewin, Onsala (Sweden) | ||
| Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (Sweden) | ||
| Appl. No. 10/581,787 PCT Filed Dec. 10, 2003, PCT No. PCT/SE03/01919 § 371(c)(1), (2), (4) Date Jun. 06, 2006, PCT Pub. No. WO2005/057786, PCT Pub. Date Jun. 23, 2005. |
||
| Prior Publication US 2007/0159220 A1, Jul. 12, 2007 | ||
| Int. Cl. H03B 19/00 (2006.01) | ||
| U.S. Cl. 327—116 [327/119] | 10 Claims |
| 1. A device for multiplying the pulse frequency of a signal in the form of a pulse train, the device comprising:
an input port for the signal and a plurality of access points for accessing the signal at points with a predetermined phase
difference between said points;
first circuits at a first level for combining accessed signal pairs, there being a same phase distance within all the combined
pairs, the output from each first level circuit being a new pulse train;
a second circuit at a second level for combining the pulse trains from the first level circuits into a single pulse train,
wherein output pulse trains have rise flanks which coincide with the rise flank of the first signal in the combined accessed
signal pairs, and fall flanks which coincide with the fall flanks of the second signal in said pair,
wherein the phase distance within the combined pairs is calculated according to the formula (360/[2*N])+180, where N is the
desired multiplication factor, N being a number greater than 1, and
wherein the device further comprises switching circuitry connected to the input of one or several of the first level circuits
for switching the input to provide the first level circuits with another phase distance within the combined signal pair according
to the formula (360/[2*N])+180, where N is a desired multiplication factor and N is a number greater than 1.
|