Precision frequency-independentvariable-phase phase shifter
K. Sudhakar Rao, V. Jagadeesh Kumar, Parameswaran Sankaran · Electronics Letters · 1995
A frequency-independent phase shifter, that provides a precise phase shift, variable from 0 to 360°, is described. With the use of a microcontroller and feedback arrangement, the phase shift depends only on the ratio of two DC voltages. A stable, drift-free operation with good accuracy is hence obtained over the AF range.