Patent ID: 7589576
Filing Date: 2009-09-15
Classification: H03H

Abstract:
1. A phase shifter, comprising: a first multiplier unit receiving an input signal and a first digital control signal that specifies a phase shift quantity for the input signal and outputting a first output signal obtained by multiplying the input signal with a first multiplication value calculated by the first multiplier unit based upon the first digital control signal, wherein the first multiplier unit includes: a second multiplier unit receiving an orthogonal input signal having a phase perpendicular to a phase of the input signal and a second digital control signal that specifies the phase shift quantity, and outputting a second output signal obtained by multiplying the orthogonal input signal with a second multiplication value calculated by the second multiplier unit based upon the second digital control signal; and an adder/subtractor unit that executes addition or subtraction by using the first output signal and the second output signal based upon a third digital control signal corresponding to the phase shift quantity.