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发明公开
CN103457575A 调谐电路 有权

调谐电路
摘要：
本发明的调谐电路不对输出进行静噪而一边调整振荡频率一边调整调谐频率。调谐电路(10)包括一对电感(12、14)和调谐用可变电容部(30)，通过变更调谐用可变电容部(30)的容量来调整调谐频率，从接收信号得到限定了频带的调谐信号。而且，包括：振荡用电感(36)，其流过与调谐信号对应的电流；振荡用可变电容部(38)，其对包括振荡用电感(36)的系统的振荡频率进行调整；控制部(32)，其一边根据希望调谐频率变更上述振荡用可变电容部(38)的容量一边将上述振荡用可变电容部(38)的容量调整为使振荡频率与希望调谐频率对应的容量，与调整后的振荡用可变电容部(38)的容量对应地调整上述调谐用可变电容部的容量。
摘要（英）：

The invention provides a tuning circuit aims to adjust a tuning frequency without muting an output while adjusting an oscillation frequency. The tuning circuit (10) includes a pair of inductors (12, 14) and a tuning variable capacitor unit (30), adjusts a tuning frequency by changing a capacitance of the tuning variable capacitor unit (30), and obtains a tuning signal having a limited band from a received signal. The tuning circuit includes an oscillating inductor that passes a current corresponding to the tuning signal, an oscillating variable capacitor unit (38) that adjusts the oscillation frequency of a system including the oscillating inductor, and a controller (32) that changes a capacitance of the oscillating variable capacitor unit correspondingly to a desired tuning frequency while adjusting the capacitance such that the oscillation frequency corresponds to the desired tuning frequency, and adjusts a capacitance of the tuning variable capacitor unit in accordance with the adjusted capacitance of the oscillating variable capacitor unit (38).

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