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Class Information
Number: 333/178
Name: Wave transmission lines and networks > Coupling networks > Frequency domain filters utilizing only lumped parameters > Transformer coupled > Including bandwidth adjusting, shaping, or stabilization means
Description: Subject matter wherein means are provided for adjusting the bandwidth or for maintaining constant bandwidth when circuit parameters are intentionally varied or when circuit parameters vary as a result of fluctuations in ambient conditions.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7170218 |
Electronic apparatus with two quartz crystal oscillators utilizing different vibration modes |
Jan. 30, 2007 |
| 7034636 |
Tunable filters having variable bandwidth and variable delay |
Apr. 25, 2006 |
| 6801102 |
Tunable filters having variable bandwidth and variable delay |
Oct. 5, 2004 |
| 6686816 |
Method of balancing the bandwidth of a dual-mode filter |
Feb. 3, 2004 |
| 6160851 |
Line driver calibration circuit |
Dec. 12, 2000 |
| 5758276 |
Double super-heterodyne receiver with low-pass and high-pass filters controlled by respective switching devices |
May. 26, 1998 |
| 5594395 |
Diode tuned resonator filter |
Jan. 14, 1997 |
| 4989264 |
Bandwidth limiting circuit with variable bandwidth |
Jan. 29, 1991 |
| 4600903 |
Gain control compensation for bandpass filter with variable bandwidth |
Jul. 15, 1986 |
| 4433315 |
Tunable coupling network |
Feb. 21, 1984 |
| 4399561 |
Variable capacitance circuit |
Aug. 16, 1983 |
| 4395688 |
Linear phase filter with self-equalized group delay |
Jul. 26, 1983 |
| 4385402 |
Switchable filter circuits |
May. 24, 1983 |
| 4287602 |
Rejection filter to remove TV channel 6 and FM radio interference |
Sep. 1, 1981 |
| 4198612 |
Image analysis nonlinear adaptive filter for improving signal-to-noise ratio |
Apr. 15, 1980 |
| 4123732 |
Method of making tuned resonance passive electronic filters |
Oct. 31, 1978 |
| 3944937 |
Broad-band signal transmitting device using transformer |
Mar. 16, 1976 |
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