| 摘要 |
A system for amplifying R.F. signals with a selectable substantially constant phase at the output port (OP) relative to the input port (IP) comprises a phase shifter (PS) and an amplifier (AMP), a phase discriminator (PD) and a video processor (VP) which controls the phase shifter (PS) in accordance with the output of the phase discriminator (PD) and a phase selection signal (SEL). This signal (SEL) selects a bias voltage to cause the phase shifter to introduce a phase shift such that the relative phase at the output port is approximately equal to a desired value and also to select a monotonically varying error function which is derived from the phase discriminator and which is representative of the difference between the desired value and the actual value of the relative phase.
|
