Invention Grant
- Patent Title: Direct digitally tunable microwave oscillators and filters
- Patent Title (中): 直接数字可调微波振荡器和滤波器
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Application No.: US10420167Application Date: 2003-04-21
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Publication No.: US07310215B2Publication Date: 2007-12-18
- Inventor: Eliezer Pasternak
- Applicant: Eliezer Pasternak
- Applicant Address: US CA Santa Clara
- Assignee: Bridgewave Communications, Inc.
- Current Assignee: Bridgewave Communications, Inc.
- Current Assignee Address: US CA Santa Clara
- Agency: DLA Piper US LLP
- Main IPC: H01H5/00
- IPC: H01H5/00

Abstract:
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.
Public/Granted literature
- US20030194973A1 Direct digitally tunable microwave oscillators and filters Public/Granted day:2003-10-16
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