Patent ID: 6747499
Filing Date: 2004-06-08
Classification: H03H

Abstract:
Tunable quadrature phase shifter comprisingan input means (IN) for inputting an input signal, a transimpedance converter that converts the input signal from a voltage signal to a current signal, splitting means (10) for splitting the input signal into two essentially orthogonal first and second signals (i1, i2), adding means (6) for adding said first and second signals (i1, i2), subtracting means (7) for subtracting said first and second signals (i1, i2), a first output (OUTâˆ’) for outputting a first output signal (vo1) based on the output signal from said adding means (6), and a second output (OUTâˆ’) for outputting a second output signal (vo2) based on the output signal from said subtracting means (7), characterized in that said splitting means (10) is provided as an all-pass circuit, which produces two quadrature signals with equal amplitude without using a feedback loop.