Patent ID: 6518811
Filing Date: 2003-02-11
Classification: H03H,H04J

Abstract:
A phase adjustment circuit comprising:a signal path comprising a first plurality of phase adjustment elements, each of the phase adjustment elements is coupled to at least one other of the phase adjustment elements, wherein each of the phase adjustment elements of the first plurality comprises a first path and a second path, the second path of each of the phase adjustment elements of the first plurality adds a smaller amount of phase adjustment to the signal path than the first path of each of the phase adjustment elements of the first plurality, and the amount of phase adjustment added by each of the phase adjustment elements of the first plurality is cumulative; a selection circuit coupled to each of the phase adjustment elements of the first plurality and configured to select one of the first path and the second path of each of the phase adjustment elements of the first plurality; a second plurality of phase adjustment elements coupled to the first plurality of phase adjustment elements, each of the phase adjustment elements of the second plurality is coupled to at least one other of the phase adjustment elements of the first and second pluralities, wherein each of the phase adjustment elements of the second plurality comprises a first path and a second path, the second path of each of the phase adjustment elements of the second plurality adds a smaller amount of phase adjustment to the signal path than the first path of each of the phase adjustment elements of the second plurality, and the amount of phase adjustment added by each of the phase adjustment elements of the second plurality is cumulative; a second selection circuit coupled to each of the phase adjustment elements of the second plurality and configured to select one of the first path and the second path of each of the phase adjustment elements of the second plurality; a third plurality of phase adjustment elements coupled to the first plurality of phase adjustment elements, each of the phase adjustment elements of the third plurality is coupled to at least one other of the phase adjustment elements of the first, second and third pluralities, wherein each of the phase adjustment elements of the third plurality comprises a first path and a second path, the second path of each of the phase adjustment elements of the third plurality adds a smaller amount of phase adjustment to the signal path than the first path of each of the phase adjustment elements of the third plurality, and the amount of phase adjustment added by each of the phase adjustment elements of the third plurality is cumulative; and a third selection circuit coupled to each of the phase adjustment elements of the third plurality and configured to select one of the first path and the second path of each of the phase adjustment elements of the third plurality.