Patent ID: 6664870
Filing Date: 2003-12-16
Classification: H03H

Abstract:
A phase shifter for changing the phase of a signal fed to an input port of such circuit 180 degrees as such signal passes through the circuit to an output port in response to a logic state change in a binary control signal fed to the circuit, such circuit comprising:a first inductive reactance element; a first capacitive reactance element; a first pair of switching elements, a first switching element of such first pair switching between a conducting state and a non-conductive state when the control signal changes from a first logic state to a second logic state while a second switching element of such first pair of switching elements switches between a non-conducting state and a conductive state when the control signal changes from the first logic state to the second logic state; a second pair of switching elements, a first switching element of such second pair switching between a conducting state and a non-conductive state when the control signal changes from a first logic state to a second logic state while a second switching element of such second pair of switching elements switches between a non-conducting state and a conductive state when the control signal changes from the first logic state to the second logic state; a second inductive reactance element coupled across the first switching element of the first pair of switching elements; a second capacitive reactance element coupled across the second switching element of the second one of the pair of switching elements; wherein the first inductive and first capacitive reactance elements each have a first terminal thereof connected to one of the input and output ports of the circuit, the first inductive reactance element has a second terminal thereof connected to a first node and the first capacitive reactance element has a second terminal thereof connected to a second node; and wherein the first switching element of the first pair of switching elements is coupled between the first node and a reference potential; wherein the second switching element of the second pair of switching elements is coupled between the second node and the reference potential; wherein the second switching element of the first pair of switching elements is coupled between the first node and the other one of the input and output ports; and wherein the first switching element of the second pair of switching elements is coupled between the second node and said other one of the input and output ports.