| 摘要 |
A measurement circuit for measuring a level of a radio frequency signal comprises a first signal path adapted to conduct a first version of a radio frequency signal and a second signal path adapted to conduct a second version of said radio frequency signal. The first and second versions have different phases. A combining circuit ( 301, 302, 405, 406, 407, 501, 502, 503, 605, 606, 607, 608, 609, 610, 801, 802 ) is coupled to receive the first version and the second version of the radio frequency signal. The combining circuit comprises a phase shifter part ( 301, 405, 406, 605, 606, 607, 801 ) adapted to change the phase of at least one of the first version and the second version of the radio frequency signal to make the phases of the first version and the second version equal, and an adder part ( 302, 407 ) adapted to produce a sum of the first version and the second version the phases of which were made equal, the sum being indicative of the level of the radio frequency signal.
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