发明名称 |
Direct digitally tunable microwave oscillators and filters |
摘要 |
A tunable element in the microwave frequency range is described that may include one or more tunable elements that are directly digitally controlled by a digital bus connecting a digital control circuit to each controlled element. In particular, each digital signal is filtered by a digital isolation technique so that the signal reaches the tunable elements with very low noise. The low noise digital signals are then converted to analog control voltages. The direct D/A conversion is accomplished by a special D/A converter which is manufactured as an integral part of a substrate. This D/A converter in accordance with the invention may consist of a resistor ladder or a directly digitally controlled capacitor. The direct digitally controlled capacitor may be a cantilevered type capacitor having multiple separate electrodes or sub-plates representing binary bits that may be used to control the capacitor. A low cost microwave oscillator is disclosed in which some of the filters and oscillators are direct digitally tuned elements.
|
申请公布号 |
US2003194973(A1) |
申请公布日期 |
2003.10.16 |
申请号 |
US20030420167 |
申请日期 |
2003.04.21 |
申请人 |
BRIDGEWAVE COMMUNICATIONS, INC. |
发明人 |
PASTERNAK ELIEZER |
分类号 |
H03B1/00;H04B1/18;(IPC1-7):H04B1/40 |
主分类号 |
H03B1/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|