An alternative 90° phase-shifting technique
R. Konn, Robert Genin · International Journal of Electronics · 1979
A circuit is proposed that, assures constant 90° phase shifting (and, eventually, any value between 0° and 180°) of a sinusoidal signal over a 1 to 100 frequency range. A brood input amplitude range is available, up to 40 dB or more, with only small phase and gain errors. Two basic versions, with quite equivalent performances, built around a classical voltage-controlled phase shifter, are described.