Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1998-06-05
2000-09-19
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327552, 708319, 333166, 330109, 330305, H03K 500
Patent
active
061218251
ABSTRACT:
In a tunable recursive filter implemented in a microwave monolithic integrated circuit (MMIC), a second-order recursive filter included two first order filters, having first and second transmission lines, respectively, connected in parallel. An amplifying unit having a cascode amplifier is arranged in a forward path shared by the two first-order filters. A combiner receives an input signal and a first and second feedback signals fed back through the first and second transmission lines, respectively, and combines such signals to output a combined signal. The amplifying unit amplifies the combined signal and outputs an amplified signal. A divider divides the amplified signal from the amplifying unit, outputs a first portion of the divided signal, and feeds back a second and third portion of the divided signal through the first and second transmission lines.
REFERENCES:
patent: 5032839 (1991-07-01), Even-Or
patent: 5339057 (1994-08-01), Rauscher
patent: 5661437 (1997-08-01), Nishikawa et al.
Jin-Su Ko, Kwyro Lee, "Low Power, Monolithic Tunable Recursive Filters having Variable and Uniform Gain," 1997 IEEE Radio Frequency Integrated Circuits Symposium, pp. 51-54.
Schellenberg, James, Digest of Technical Papers, 1997 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Denver, Colorado, Jun., 1997.
Delmond, M., et al. "Microwave Tunable Active Filter Design in MMIC Technology Using Recursive Concepts," IEEE 1995 Microwave and Millimeter-Wave Monolithic Circuits Symposium, pp. 105-108, Jul. 1995.
Kobayashi, K.W., et al., "GaAs HBT 0.75-5 Ghz Multifunctional Microwave-Analog Variable Gain Amplifier," IEEE GaAs IC Symposium, pp. 239-242, Mar. 1993.
Ko Jin-Su
Lee Kwy-ro
Le Dinh T.
Samsung Electronics Co,. Ltd
LandOfFree
Monolithic tunable recursive filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Monolithic tunable recursive filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Monolithic tunable recursive filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1077150