Patent ID: 6906601
Filing Date: 2005-06-14
Classification: H01P,H03H

Abstract:
1. A variable phase shifter comprising: an input node for receiving an input signal; a first path and a second path for performing analog signal processing; an output node for combining the outputs of the first path and the second path to provide an output signal; the first path including a first fixed phase shift element for shifting the phase of the input signal by a first shift value, a first active device for amplifying the output of the first phase shift element, and a first inductor for balancing gain and phase, the first active device being inductively coupled to a ground via the first inductor; the second path including a second fixed phase shift element for shifting the phase of the input signal by a second shift value, a second active device for amplifying the output of the second phase shift element, and a second inductor for balancing gain and phase, the second active device being inductively coupled to a ground via the second inductor; and a bias controller for generating first and second bias signals in response to a phase control signal for controlling amplification of the first and second active devices.