Patent ID: 7446630

Claim:
A phase shifter circuit, comprising: a power divider comprising a plurality of first lumped capacitors and a plurality of first lumped inductors, and coupled to a signal input terminal for receiving an input signal and dividing the power of the input signal to a first output terminal and a second output terminal; a first switched attenuator coupled to the first output terminal for attenuating the signal received from the first output terminal and outputting a first attenuated signal; a second switched attenuator coupled to the second output terminal for attenuating the signal received from the second output terminal and outputting a second attenuated signal; a hybrid coupler comprising a plurality of second lumped capacitors and a plurality of second lumped inductors, and coupled to the first switched attenuator and the second switched attenuator for distributing the power of the first attenuated signal and the second attenuated signal and outputting a first coupled signal and a second coupled signal, wherein there is a first phase difference between the first coupled signal and the second coupled signal; a differential phase shifter comprising a plurality of third lumped capacitors and a plurality of third lumped inductors, and coupled to the hybrid coupler for receiving the first coupled signal and the second coupled signal and outputting a first phase shifted signal and a second phase shifted signal, wherein there are a second phase difference between the first coupled signal and the first phase shifted signal, a third phase difference between the second coupled signal and the second phase shifted signal, and a fourth phase difference between the second phase difference and the third phase difference; a third switched attenuator attenuating the first phase shifted signal and outputting a third attenuated signal; a fourth switched attenuator attenuating the second phase shifted signal and outputting a fourth attenuated signal; and a power combiner comprising a plurality of fourth lumped capacitors and a plurality of fourth lumped inductors, and coupled to the third switched attenuator and the fourth switched attenuator for combining the third attenuated signal and the fourth attenuated signal into an output signal and outputting the output signal from an signal output terminal, wherein there is a fifth phase difference between the output signal and the input signal.