Patent ID: 8344822

Claim:
A switchable integrated electronic device, comprising: at least three elements series coupled in a chain between a first port and a second port with nodes between successive elements of the chain; and a switch circuit for coupling a selectable one of the nodes to a third port; wherein, with successive elements in the chain denoted r i , i=1 to N, and with adjacent positions occupied by the elements numbered consecutively 1 to N, then element r i occupies position ⌊ N + 1 2 ⌋ + ( - 1 ) i · 2 · ⌊ i 2 ⌋ for ⁢ ⁢ i = 1 ⁢ ⁢ to ⁢ ⁢ ⌊ N 2 ⌋ and position ⌊ N + 1 2 ⌋ + ( - 1 ) i · ( 2 · ⌊ N - i 2 ⌋ + 1 ) for ⁢ ⁢ i = ⌊ N 2 ⌋ + 1 ⁢ ⁢ to ⁢ ⁢ N .