Patent ID: 7456665
Filing Date: 2008-11-25
Classification: H03K,H03L

Abstract:
1. A phase shifter, in particular a phase delay device, for generating a phase-delayed output signal from an input signal, comprising: a first delay line and at least one further delay line, each with cascaded delay elements forming a U-shaped signal path along which at least one delay element is adapted to be controlled to be optionally opening or closing; a phase discriminator at the input side of which a clock signal and a signal from one of the delay lines can be applied, and the output side of which is connected with a respective control input of the delay elements; wherein the clock signal can also be applied to the first delay line, so that a feedback loop is formed by the phase discriminator and at least one of the delay lines; wherein the input signal can be applied to the delay line whose signal output is not connected with the phase discriminator, and the output signal can be output therefrom; and wherein in at least one switching state of the delay elements, the nominal phase delay corresponds to the nominal phase angle of the phase discriminator.