Direct digitally tunable microwave oscillators and filters

Details Direct digitally tunable microwave oscillators and filters Direct digitally tunable microwave oscillators and filters

2008-04-01

2008-04-01

Nguyen, Lee (Department: 2682)

Telecommunications

Carrier wave repeater or relay system

With frequency conversion

C455S073000, C361S302000, C333S202000

Reexamination Certificate

active

10269123

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.

REFERENCES:
patent: 4123716 (1978-10-01), Borg
patent: 4232318 (1980-11-01), Becker et al.
patent: 5608263 (1997-03-01), Drayton et al.
patent: 5821836 (1998-10-01), Katechi et al.
patent: 5959516 (1999-09-01), Chang et al.
patent: 6094102 (2000-01-01), Chang et al.
patent: 6028885 (2000-02-01), Minarik et al.
patent: 6127908 (2000-10-01), Bozler et al.
patent: 6172378 (2001-01-01), Hull et al.
patent: 6232847 (2001-05-01), Marcy, 5th et al.
patent: 6853261 (2005-02-01), Ling
J.B. Muldavin et al., “30 GHz Tuned MEMS Switches”, IEEE MTTS 1999.
Z. Feng et al., “Design and Modeling of RF MEMS Tunable Capacitors Using Electro-thermal Actuators” IEEE MTTS-1999.
H. Kim et al., “Millimeter Wave Micromachined Tunable Filters”, IEEE MTTS Digest, pp. 1235-1238, 1999.
C.T. Nguyen et al., “Micromachined Devices for Wireless Communications”, Proceedings of the IEEE, vol. 86, pp. 1756-1768, 1998.
J. Yao et al., “High Tuning Ration MEMS-Based Tunable Capacitors for RF Communications Applications”, Solid State Sensor and Actuator Workshop, Hilton Head, South Carolina, Jun. 8-11, 1998.

Affiliated with

Also associated with

Rating

Direct digitally tunable microwave oscillators and filters does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Direct digitally tunable microwave oscillators and filters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct digitally tunable microwave oscillators and filters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3943982