Quadrature signal generator, beamforming arrangement, communication device and base station

摘要

A quadrature signal generator comprises a resistor-capacitor, RC, polyphase filter and an inductor compensation arrangement. The inductor compensation arrangement comprises a first inductor connected between the first and the third output terminals, and a second inductor connected between the second and fourth output terminals. The first and second inductors are arranged to compensate for a capacitive load on the output terminals when in use. A beamforming arrangement, a communication device and a base station are also disclosed.

主权项

1. A quadrature signal generator comprising:
a resistor-capacitor (RC) polyphase filter comprising:
a first and a second input terminal;a first, a second, a third, and a fourth output terminal; anda plurality of cascade-connected stages of RC units, each of the RC units comprising a resistive element and a capacitive element,wherein a first end of each resistive element is set as an input, and a second end of each resistive element is set as an output for the respective stage, andwherein the capacitive element of each RC unit is connected between the second end of the resistive element of that RC unit and the first end of the resistive element of a next one of the RC units,wherein the capacitive element of a last one of the RC units is connected between the second end of the resistive element of the last one of the RC units of the stage and the first end of the resistive element of a first one of the RC units of the stage, andwherein the plurality of cascade-connected stages of RC units comprises an input stage connected to the first and second input terminals and an output stage connected to the first, second, third, and fourth output terminals; and an inductor compensation circuit connected at the output terminals, the inductor compensation circuit comprising a first inductor connected between the first and the third output terminals, and a second inductor connected between the second and fourth output terminals.