| 摘要 |
The present invention eliminates a DC offset problem due to self-mixing in performing frequency conversion on a multiband OFDM_UWB signal by a direct conversion scheme. Capacitors # 1 , # 2 , and # 3 are provided for each of the hopping bands # 1 , # 2 , and# 3 . Capacitors are switched in synchronization with frequency hopping. For example, capacitor # 1 stores electric charge just before frequency hopping from band # 1 to another band # 2 , and continues a step response after hopping to band # 1 again. Soon, the charging/discharging of capacitor # 1 ceases and reaches a steady state.
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