| 摘要 |
A stabilized quadrature RC/CR phase shifting network for generating quadrature RF and microwave signals. The network uses offset biasing of postamplifiers following the phaseshifter to fine tune quadrature-phase, and further uses an output quadrature-phase detector to stabilize quadrature-phase with negative feedback by using the quadrature-phase error signal to drive the quadrature-phase fine tuning control. In an alternative embodiment, the stability of quadrature-phase can be enhanced without the output quadrature-phase detector by making the quadrature-phase fine tuning control dependent upon the amplitude- difference negative feedback error signal. |
