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    • 2. 发明专利
    • Tuning circuit
    • 调谐电路
    • JP2013251876A
    • 2013-12-12
    • JP2012127403
    • 2012-06-04
    • Semiconductor Components Industries Llcセミコンダクター・コンポーネンツ・インダストリーズ・リミテッド・ライアビリティ・カンパニー
    • SEKIGUCHI SATOSHIINABA SHINYAODAJIMA TORU
    • H04B1/18H03J3/20
    • H04B1/16H03J1/0008H03J3/20H03J5/0245H03J2200/10
    • PROBLEM TO BE SOLVED: To adjust a tuning frequency while adjusting an oscillation frequency without muting output.SOLUTION: A tuning circuit comprises a pair of inductors 12, 14 and a variable capacitance part 30 for tuning. A tuning frequency is adjusted by changing capacitance of the variable capacitance part 30 for tuning, and a band-limited tuning signal is obtained from a received signal. The tuning circuit further comprises an oscillation inductor 36, a variable capacitance part 38 for oscillation, and a control part 32. The oscillation inductor 36 causes a current corresponding to the tuning signal to flow. The variable capacitance part 38 for oscillation adjusts an oscillation frequency of a system including the oscillation inductor 36. In the control part 32, while changing the capacitance of the variable capacitance part 38 for oscillation in accordance with a desired tuning frequency, the oscillation frequency is adjusted to capacitance corresponding to the desired tuning frequency, and the capacitance of the variable capacitance part for tuning is adjusted in accordance with the adjusted capacitance of the variable capacitance part 38 for oscillation.
    • 要解决的问题:调整振荡频率而不使静音输出调整调谐频率。调谐电路包括一对电感器12,14和用于调谐的可变电容部分30。 通过改变用于调谐的可变电容部分30的电容来调节调谐频率,并且从接收信号获得带限调谐信号。 调谐电路还包括振荡电感器36,用于振荡的可变电容部分38和控制部分32.振荡电感器36使与调谐信号对应的电流流动。 用于振荡的可变电容部38调节包括振荡电感器36的系统的振荡频率。在控制部32中,在根据期望的调谐频率改变用于振荡的可变电容部38的电容的同时,振荡频率为 调整到对应于期望的调谐频率的电容,并且用于调谐的可变电容部分的电容根据用于振荡的可变电容部分38的调整的电容进行调整。