Tunable quadrature phase shifter

Details Tunable quadrature phase shifter Tunable quadrature phase shifter

H - Electricity

03

F

H03F 3/45 (2006.01) H03H 11/22 (2006.01)

Patent

CA 2159877

A tunable quadrature phase shifter including two branches each constituted by the cascade connection of a filter, an amplifier and a summing circuit, and two cross- connections constituted by amplifiers interconnecting the filter of one branch to the summing circuit of the opposite branch. An accurate 90 degrees phase shift between the two output signals is obtained by controlling the tail currents of the four amplifiers. The phase shifter used in mobile telecommunication transceivers may be easily and accurately tuned because the signals used in the summing circuits all have a similar amplitude. It is further adapted to operate with only 3 Volt battery supply as used in wireless phones. The bandwidth of the amplifiers is increased by using double differential pair amplifiers which behave as cascode arrangements.

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