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| Number | Title | Issue Date |
| 7768363 | Inter-stage coupling with a transformer and parallel AC-coupling capacitor An RF coupling circuit including a transformer and a parallel AC-coupling capacitor can advantageously ameliorate substantial attenuation of a signal, prevent destabilization of any feedback loop, and simplify the circuit design process. The AC-coupling capacitor ca... | 08/03/2010 |
| 7183880 | Discrete inductor bank and LC filter A discrete inductive-capacitive (LC) filter selects between at least two inductor banks to tune the LC filter. The filter receives an input signal that includes one or more bands of frequencies. A control signal selects a band of frequencies for processing. A first ... | 02/27/2007 |
| 7170218 | Electronic apparatus with two quartz crystal oscillators utilizing different vibration modes The electronic apparatus comprises a display portion and a quartz crystal oscillator at least, and said electronic apparatus comprises at least two quartz crystal oscillators. Also, each of two quartz crystal oscillators of the at least two oscillators comprises a q... | 01/30/2007 |
| 7102465 | Frequency discrete LC filter bank An inductive (“L”)-capacitive (“C”) filter bank has application for use in a television receiver. The LC filter includes inductors configured in at least one inductive (“L”) bank, and capacitors configured in at least one capacitive (“C”) bank. The i... | 09/05/2006 |
| 7088202 | Methods and apparatus for an improved discrete LC filter A discrete inductive-capacitive (LC) filter selects between at least two inductor banks to tune the LC filter. The filter receives an input signal that includes one or more bands of frequencies. A control signal selects a band of frequencies for processing. A first ... | 08/08/2006 |
| 7082022 | Circuit for diverting surges and transient impulses A circuit for attenuating a surge is disclosed that might include a conductor for receiving the surge, a capacitor, positioned along the conductor, for blocking the surge, and a gas tube having a first end coupled to the conductor and a second end coupled to a groun... | 07/25/2006 |
| 7078987 | Narrow band-pass tuned resonator filter topologies having high selectivity, low insertion loss and improved out-of-band rejection over extended frequency ranges A tuned resonator circuit topology is disclosed that permits implementation of narrow band-pass filters having high loaded Q and optimal coupling (for low insertion loss) using a parallel tuned resonator topology at frequencies in the 1 to 2 GHz range and beyond. Th... | 07/18/2006 |
| 7034636 | Tunable filters having variable bandwidth and variable delay An apparatus for reducing influence by selected signal components in a communication link includes a first signal line conveying a first communication signal including a desired signal component and at least one undesired signal component; a second signal line conve... | 04/25/2006 |
| 6940365 | Methods and apparatus for an improved discrete LC filter A discrete inductive-capacitive (LC) filter selects between at least two inductor banks to tune the LC filter. The filter receives an input signal that includes one or more bands of frequencies. A control signal selects a band of frequencies for processing. A first ... | 09/06/2005 |
| 6801102 | Tunable filters having variable bandwidth and variable delay A tunable electrical filter constructed pursuant to the teachings of the present invention includes: (a) a plurality of resonator units coupled between an input locus and an output locus; and (b) a plurality of tunable dielectric varactor units; respective individua... | 10/05/2004 |
| 6686816 | Method of balancing the bandwidth of a dual-mode filter A method of balancing the bandwidth of a dual-mode filter, consisting of a ring resonator produced by microstrip technology, removes strip material in one or more places on the ring resonator where the first of the two modes of the ring resonator has a ma... | 02/03/2004 |
| 6160851 | Line driver calibration circuit A calibration circuit adjusts a differential output voltage from a line driver circuit when the differential output voltage falls outside a specified tolerance range. The calibration circuit includes a sample and hold circuit which samples the differentia... | 12/12/2000 |
| 5758276 | Double super-heterodyne receiver with low-pass and high-pass filters controlled by respective switching devices A double super-heterodyne receiver has a high-frequency input circuit that includes a high-frequency amplifying device, a low-pass filter and a high-pass filter used for obtaining bandpass characteristics for the receiving band. A switching device for cha... | 05/26/1998 |
| 5594395 | Diode tuned resonator filter A transmission line resonator is disclosed which has a resonance frequency that is electrically controllable by control voltage. A reactive circuit is coupled in parallel between two coupling points on the transmission line resonator. The reactive value o... | 01/14/1997 |
| 4989264 | Bandwidth limiting circuit with variable bandwidth Upper and lower limiting side LC series resonance circuits having resonance frequencies near the upper and lower limiting frequencies of the bandwidth of a surface acoustic wave (SAW) filter as a bandpass filter (BPF) having a fixed passing bandwidth are ... | 01/29/1991 |
| 4600903 | Gain control compensation for bandpass filter with variable bandwidth A bandpass filter is presented which is constructed so that bandwidth of the bandpass filter may be varied without varying gain from an input signal to an output signal when the input signal is at a center frequency. A crystal resonator is connected in se... | 07/15/1986 |
| 4433315 | Tunable coupling network A tunable coupling network for a frequency multiplier stage providing a passband for a desired harmonic of a fundamental frequency and rejection notches for undesired harmonic frequencies. The passband of the network can be tuned by changing the value of ... | 02/21/1984 |
| 4399561 | Variable capacitance circuit A circuit having a variable input impedance which is controlled by application of a direct current input signal. The variable impedance circuit comprises a pair of capacitors coupled in series with a pair of diodes. The diodes are rendered conductive in r... | 08/16/1983 |
| 4395688 | Linear phase filter with self-equalized group delay In modern communication systems, it has become important to provide filters, and in particular bandpass filters, which can provide substantially uniform group delay across the bandwidth of the filter while still achieving good amplitude response. In this ... | 07/26/1983 |
| 4385402 | Switchable filter circuits A switchable filter circuit for use in a receiver to select a first or a second frequency band from a received signal and for providing predetermined minimum stop band attenuation at frequencies outside the selected frequency band, the second frequency ba... | 05/24/1983 |
| 4287602 | Rejection filter to remove TV channel 6 and FM radio interference A two terminal electronic filter network is provided for connection across TV antenna input terminals to reduce interference from noncommercial FM radio stations operating within a frequency band near the TV channel 6 frequency band. The two terminal elec... | 09/01/1981 |
| 4198612 | Image analysis nonlinear adaptive filter for improving signal-to-noise ratio A nonlinear adaptive filter for improving the signal-to-noise ratio of video signals generated from images of features under analysis typically includes filtering components for attenuating low amplitude video noise excursions while passing high amplitude... | 04/15/1980 |
| 4123732 | Method of making tuned resonance passive electronic filters A method for making tuned resonance passive electronic filters. The method consists of computing the values of the filter components and then using standard unmatched components that approximate the computed values in conjunction with certain components t... | 10/31/1978 |
| 3944937 | Broad-band signal transmitting device using transformer A broad-band signal transmitting device including a signal transmitting transformer of the primary to secondary turn ratio 1 : N, comprising a first circuit for expanding the transmission band to low frequencies by decreasing the impedance as well as by d... | 03/16/1976 |
