Patent ID: 7423464
Filing Date: 2008-09-09
Classification: H03C

Abstract:
1. An apparatus for precise modulation of signal phase and signal delay, respectively, and signal amplitude, comprising: a first fixed-delay device having its input coupled to an input signal, a first variable delay device having its input coupled to said input signal and having a control input for delay adjustment, an amplitude control device in series with the first variable delay device, providing at its output an amplitude controlled signal and having a control input for adjusting the output amplitude, and wherein said amplified controlled signal is configured to drive an antenna, a coupling device having its input coupled to the output of the amplitude control device, comprising a first output for providing a first output signal in response to the amplitude controlled signal at its input, a phase detector with linear characteristic having its two inputs connected to the output of the fixed-delay device and the first output of the coupling device, a first error measurement device having its negative input connected to the output of the phase detector and its positive input connected to a first control signal, a first amplifier with low-pass characteristic having its input connected to the output of the first error measurement device and its output to the control input of the first variable delay device.