| 摘要 |
There are disclosed various methods, apparatuses and computer program products for resonance tuning. In some embodiments an oscillator signal derived from a local oscillator (125) signal is received and a control signal (208) is generated by using the oscillator signal. The control signal is to be provided to a resonance tuning circuit (202) configured to be coupled to an antenna (102); and a signal level indication (228) on the basis of the resonance of the resonance tuning circuit is produced. The signal level indication (228) is compared with a reference signal (224); and on the basis of the comparison it is determined whether the resonance of the antenna effected by the generated control signal (208) fulfills a determined condition. In some embodiments there is provided an apparatus comprising a resonance tuning circuit (202) configured to be coupled to an antenna (102), a control element (204) comprising an input to receive an oscillator signal derived from a local oscillator (125) signal, the control element (204) configured to produce a control signal (208) for the resonance tuning circuit (202) by using the oscillator signal, a signal level detector (230) to generate a signal level indication (228) on the basis of the resonance of the resonance tuning circuit (202), a comparator (222) for comparing the signal level indication (228) with a reference signal (224), and the control element (204) further to determine on the basis of the comparison whether the resonance of the antenna effected by the generated control signal fulfills a determined condition. |
