Voltage-controlled phase shifter circuit for an electronic musical instrument

Claim 1

A voltage-controlled phase shifter circuit for an electronic musical instrument comprising: a plurality of stages of cascode-connected transistor pairs, each stage of transistor pair consisting of a pair of transistors each of which has its collector connected to the emitter of each corresponding transistor in the following stage of transistor pair and has its base maintained at a constant potential; means connected to the emitter of each transistor in the first stage of transistor pair of said a plurality of stages of cascode-connected transistor pairs for changing the emitter-collector current of said each transistor in said first stage of transistor pair in relation of opposite phase to each other with respect to the signal to be transferred; and means for changing the emitter-collector current of each transistor in each stage of transistor pair in relation of same phase to each other with respect to the control voltage for amount of phase shift, one of a pair of transistors in each stage of transistor pair having its emitter connected through an impedance conversion circuit and a capacitor to the collector of the other of the pair of transistors in the same stage of transistor pair and said other of the pair of transistors having its emitter connected through an impedance conversion circuit and a capacitor to the collector of said one of the pair of transistors, whereby the signal derived at the final stage of transistor pair of said at least one stage of transistor pair cascode-connected is shifted from the signal applied to said first stage of transistor pair.