专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明公开

KR1020090068339A 아날로그 필터의 대역폭을 제어하는 방법 无效
标题翻译：控制模拟滤波器的带宽
公开(公告)号：KR1020090068339A
公开(公告)日：2009-06-26
申请号：KR1020097007867
申请日：2007-08-30
申请人： 엔엑스피 유에스에이, 인코포레이티드
发明人： 라흐만,마히부르 , 파케스,존,제이. , 리치스,제임스제이.
IPC分类号： H04B1/66 , H03H11/04
CPC分类号： H04B1/30 , H03H11/1256 , H03H11/1291 , H03H2210/012 , H03H2210/015 , H03H2210/025 , H03H2210/036
摘要： A digital tuning system (250) for changing a cutoff frequency of an analog filter (132) includes digital synthesizers (292 and 294) for producing a two-tone calibration signal (196) applied to an input of the filter after a quality factor of the filter is increased. The filter includes at least one R/C circuit with two resistors (304 and 306) for changing the quality factor and arrays (308 and 310) of capacitors for changing the cutoff frequency. The amplitude of the magnitude responses (409 and 411) of the filter to each tone (405 and 407) is measured by a two discrete Fourier transform single-frequency bin power detection circuits (253 and 254) while the filter is sequenced through a plurality of capacitance settings. An optimal capacitance for the R/C circuit is selected by comparing, to a pre-selected value, a difference between the responses of the filter to each tone, for each capacitance setting.
摘要翻译：用于改变模拟滤波器（132）的截止频率的数字调谐系统（250）包括数字合成器（292和294），用于产生应用于滤波器的输入的双色调校信号（196）过滤器增加。滤波器包括至少一个R / C电路，其具有用于改变用于改变截止频率的电容器的品质因数和阵列（308和310）的两个电阻器（304和306）。滤波器对每个音调（405和407）的幅度响应（409和411）的幅度通过两个离散的傅里叶变换单频率二次谐波频域功率检测电路（253和254）来测量，而滤波器通过多个的电容设置。对于每个电容设置，通过将滤波器的响应与每个音调的差值与预选值进行比较来选择R / C电路的最佳电容。

IPRDB

热门服务

关于我们

友情链接

联系方式