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| Number | Title | Issue Date |
| 7197522 | Bi-quad digital filter configured with a bit binary rate multiplier The invention is directed to a bi-quad filter circuit configured with sigma-delta devices that operate as binary rate multipliers (BRMs). Unlike conventional bi-quad filter circuits, the invention provides a bi-quad filter configured with a single-bit BRM. In anothe... | 03/27/2007 |
| 7071727 | Method and apparatus for mitigating radio frequency radiation from a microprocessor bus A low-pass filter 10 on a microprocessor bus 22 for attenuating radio frequencies from digital signals travelling on the bus 22 from a microprocessor 12 to a peripheral device 20. An RC network is implemented as close as physically... | 07/04/2006 |
| 7042304 | Circuit device for realizing a non-linear reactive elements scale network The invention relates to a circuit device for realizing a non-linear reactive elements scale network, wherein the non-linear elements of the network are pairs of inductive and capacitive components cascade connected between a pair of input terminals and a pair of ou... | 05/09/2006 |
| 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 |
| 4980658 | Gigahertz bandpass passive integrator A passive cylindrical integrator assembly is disclosed which provides an output voltage into 50 ohm load that is proportional to the time integral of the input voltage. The device has a bandpass of greater than 1000 MHz plus and a risetime which is less t... | 12/25/1990 |
| 4961184 | Integrate and hold amplifier The present invention relates to a system which uses information in a certain band of frequencies, fb. The information of interest is contained in an analog signal that has noise at higher frequencies. The analog signal is sampled using an inte... | 10/02/1990 |
| 4961059 | Combined RFI rejection and intergrating two-section filter A combined RFI filter and low pass filter includes two sections, both of which serve as both radio frequency interference filters and low pass filters, or dc integrators. Both sections have substantially equal time constants and employ non-polarized capac... | 10/02/1990 |
| 4862121 | Switched capacitor filter A biquadrature switched capacitor filter having differential input/output integrator amplifiers (12,34) and switched capacitor networks (16,28,36,40). The differential outputs of one amplifier (12) are crossed and connected to the switched capacitor netwo... | 08/29/1989 |
| 4720701 | System with enhanced signal detection and discrimination with saturable magnetic marker An antipilferage system is provided with an improved signal processing system to prevent false alarms. This signal processing involves singly or in combination the improvements of a slew rate limited amplifier, which prevents impulse noise from ringing or... | 01/19/1988 |
| 4714866 | Rate-of-change signal generator using sampling techniques There is disclosed herein an apparatus and method for generating a first signal related to the rate of change of a second signal. In particular, a system is disclosed for generating a velocity signal in a sampled data servo system. The apparatus uses thre... | 12/22/1987 |
| 4698596 | Switched capacitor switching A switched capacitor parasitic insensitive integrator comprises an operational amplifier (6), an integrating capacitor C2, a switched capacitor C, and four switches, two of even phase E1, E2 and two of odd phase 01, 02. In order to minimize the... | 10/06/1987 |
| 4623854 | Switched capacitor filter A switched capacitor filter having the same value of capacitance for the integrating capacitor of each filter channel. The use of the same value capacitance results in DC offset voltages for each channel being identical and easy to correct. An input volta... | 11/18/1986 |
| 4586008 | Fast passive coaxial integrator A passive integrator capable of correctly providing outputs with risetimes as short as 250 ps. An outer conductor has coaxially mounted therein a short length of an inner conductor so as to constitute a very low impedance transmission line. The short leng... | 04/29/1986 |
| 4559498 | Symmetrical integrator and application of said integrator to an electric filter The symmetrical integrator comprises an operational amplifier having two floating inputs and two floating outputs each having a feedback connection to an input via a capacitor. An input capacitor is connected via two MOS transistors to two differential in... | 12/17/1985 |
| 4550295 | Switched capacitor integrator A switched capacitor integrator is comprised of an operational amplifier, a feedback capacitor connected between the inverting input terminal and the output terminal of the amplifier, a bias circuit for applying a given voltage to the non-inverting input ... | 10/29/1985 |
| 4539488 | Pulse wave to parabola wave converter An electronic image framing circuit is described for eliminating the visible effects of pincushion distortion at the edges of a television image. Toward this end, portions of video lines which extend beyond a selected straight line image boundary are blan... | 09/03/1985 |
| 4521752 | Passive transient recording systems Methods and apparatus for recording pulse signal information utilizing threshold integrating devices in which a pulse shaped signal is applied to a plurality of threshold integrating devices each having a predetermined quantity of electric charge carriers... | 06/04/1985 |
| 4506236 | Composite filter/differentiator There is shown and described a relatively simple electronic circuit using few discrete components which is used to replace the filter and delay line differentiator in existing circuits. The new circuit provides a simultaneous output of even and odd signal... | 03/19/1985 |
| 4484089 | Switched-capacitor conductance-control of variable transconductance elements Many signal processing applications of practical importance (for example, continuous-signal filtering) require high-precision temperature-insensitive transconductance elements. In accordance with one feature of this invention, a reference transconductance... | 11/20/1984 |
| 4383228 | Filter device comprising switched-capacitance integrating networks High-pass, low-pass and band-pass filters are obtained by combining switched-capacitance integrating networks.... | 05/10/1983 |
| 4353044 | Switched-capacitor filter circuit having at least one simulated inductor and having a resonance frequency which is one-sixth of the sampling frequency A switched-capacitor filter circuit having at least one simulated inductor and having a resonance frequency which is one-sixth of the sampling frequency as pulse-controlled switches co-operatively operable for connecting a first capacitor to a pair of inp... | 10/05/1982 |
| 4336513 | Hum reduction circuit Apparatus for reducing the fundamental and harmonic frequencies of hum in a signal comprising means for placing a plurality of signal storage means between an input to which the signal is applied and an output in repeated sequence that is synchronous with... | 06/22/1982 |
| 4313096 | Parasitic-free switched capacitor network Switched capacitor topologies currently in use are susceptible to the deleterious effects of the parasitic capacitances associated with the switches. Topologies that are immune to these effects are disclosed. A first such embodiment comprises a first swit... | 01/26/1982 |
| 4289397 | Laser ceilometer signal processing means For use in a pulsed-laser lidar such as a laser ceilometer, there are shown several examples of signal processing means for separating desired pulses due to targets such as clouds from strong background signals due to suspended particles causing poor visi... | 09/15/1981 |
| 4250472 | Undesired signal canceller An apparatus for cancelling an undesired signal includes a programmable filter in which differential waveforms of a desired signal are superimposed on one another to form a composite signal similar to an undesired signal, a control circuit for detecting a... | 02/10/1981 |
| 4197515 | Synchronous filter By combining a number of integrators with periodically switching means, which are sensing an input signal during circularly successive time intervals, sampled values are available for some of the latest time intervals sampled with a sampling frequency. By... | 04/08/1980 |
| 4056803 | Method and apparatus for extracting derivatives from surface acoustic waves An interdigital electrode transducer mounted on an acoustic surface wave propagating medium having an output proportional to an Nth order derivative of the surface acoustic waves propagating in the medium. The Nth order derivative, where N is any real, po... | 11/01/1977 |
