Patent ID: 7408424
Filing Date: 2008-08-05
Classification: H04B

Abstract:
1. An RF circuit having at least one selected operating frequency and comprising: a first I/O port for connection to a source termination by at least one first signal carrying terminal; a second differential I/O port for connection to a load termination by a pair of second signal carrying terminals; a phase shifting device having an electrical length substantially less than 180° at a selected differential mode operating frequency, said phase shifting device comprising a first section and a second section, each section comprising a first end and a second end, each of said at least one first signal carrying terminal being coupled to a respective first end of a section of said phase shifting device, each of said pair of second signal carrying terminals being connected to a respective section of said phase shifting device, and said second ends of said sections being connected together at a circuit node; a first loading shunt device connected to said first end of said first section; a second loading shunt device connected to said first end of said second section, said first and said second loading shunt devices having a capacitance, C where a capacitive element connected at said circuit node and having a capacitance C