公开(公告)号：US20140152394A1

公开(公告)日：2014-06-05

申请号：US14017391

申请日：2013-09-04

Applicant: VIA Telecom, Inc.

Inventor： Hsien-Ku CHEN ,  Bing-Jye KUO ,  Fang-Ren LIAO ,  Pei-Wei CHEN

IPC: H03B5/04 ,  G01R35/00

CPC classification number: G01R35/00 ,  G01R31/028 ,  G01R31/06 ,  G01R31/2822 ,  G01R35/005

Abstract: A frequency detection circuit includes a filter, a power detector and a voltage comparator. The filter receives and filters a converted signal to generate a filtered signal. The power of the filtered signal relates to a frequency of the converted signal. The power detector generates a voltage according to the power of the filtered signal. The voltage comparator compares the voltage with multiple reference voltages to generate multiple comparison results. At least one of the inductance and capacitance of an LC tank in an amplifier is adjusted according to the comparison results.

Abstract translation: 频率检测电路包括滤波器，功率检测器和电压比较器。 滤波器接收并过滤转换的信号以产生滤波信号。 滤波信号的功率与转换信号的频率有关。 功率检测器根据滤波信号的功率产生电压。 电压比较器将电压与多个参考电压进行比较，以产生多个比较结果。 根据比较结果调整放大器中LC箱的电感和电容中的至少一个。