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| Number | Title | Issue Date |
| 8073894 | Compact switched-capacitor FIR filter implementation A system is provided to perform non-recursive signal processing tasks using a sampled data technique and a network of switched-capacitor filters. The input analog signal is sampled in a time sequence manner at regular time intervals in order to obtain analog-valued ... | 12/06/2011 |
| 8046402 | Signal processing method and signal processing apparatus A signal processing method and apparatus reducing distortion using divided signals differing in only amplitude by weighting an input signal by first weights ki (i=1 to 4) to obtain divided signals, performing the same signal processing f(x) on the divided... | 10/25/2011 |
| 8001172 | High speed filter An electronic filter operates as a correlator that provides a discrete approximation of an analog signal. The analog to digital conversion is integrated directly approximation calculation. An array of sample and hold circuits or single bit comparators provide output... | 08/16/2011 |
| 7984093 | Polyphase filter having a tunable notch for image rejection A polyphase filter comprises an impedance network. The polyphase filter also comprises a first differential amplifier that includes first inverting and non-inverting inputs and first inverting and non-inverting outputs. The first inverting and non-inverting inputs c... | 07/19/2011 |
| 7970811 | Continuous-time multi-gigahertz filter using transmission line delay elements An analog equalization filter is disclosed which permits higher speed and linearity than existing designs, allowing for filtering operation to the hundreds of gigahertz range. Possible applications include fixed and adaptive equalization filtering and radio frequenc... | 06/28/2011 |
| 7941476 | Method of designing passive RC complex filter of Hartley radio receiver An object of this invention is to provide a method of designing a complex transfer function which can be realized in a passive RC complex filter at the same time while perfectly succeeding to features of a prototype lowpass characteristic. In this invention, as a fi... | 05/10/2011 |
| 7941475 | Programmable filter circuits and methods Embodiments of the present invention include programmable filter circuits and methods. In one embodiment, the present invention includes a programmable filter for filtering an input signal comprising a storage element for storing a plurality of digital values repres... | 05/10/2011 |
| 7937429 | Taylor series-based transmission line equalization scheme An equalization scheme for a transmission line employs a Taylor series expansion which enables the provided equalization to be adjusted based on line length. Multiple circuit blocks compute respective terms of the Taylor series, which are then summed to provide a co... | 05/03/2011 |
| 7769799 | Discrete-time analog, digitally programmable filter and method Aspects provide discrete-time analog, digitally programmable filtering. A filter includes a plurality of transistors coupled as a current mode circuit. Further included is a switch for use in switching the plurality of transistors in and out to tune the current mode... | 08/03/2010 |
| 7664811 | Apparatus using sampling capacitors A switched capacitor type filter apparatus includes sampling capacitors and has a steep characteristic with a small number of taps. The filter apparatus includes positive polarity selecting switches, negative polarity selecting switches, positive read-out switches, ... | 02/16/2010 |
| 7596589 | Time-mode analog computation circuits and methods A time-mode analog computation circuit is provided. The time-mode analog computation circuit includes one or more inputs for receiving one or more temporal input signals. The time-mode analog computation circuit further includes circuitry for performing a mathematic... | 09/29/2009 |
| 7587445 | Complex multiplex feedback filter A complex filter includes an I channel having a first I channel output and a second I channel output and a Q channel having a first Q channel output and a second Q channel output. The second I channel output is input to the Q channel through a first passive network ... | 09/08/2009 |
| 7565393 | Discrete time filter having gain for digital sampling receivers A discrete time filter achieves gain by sampling a signal using capacitors arranged in a one configuration and then changing the capacitors to a series configuration to develop a filter output voltage. In at least one embodiment, a variable gain filter is achieved b... | 07/21/2009 |
| 7562108 | High bandwidth high gain receiver equalizer A receiver equalizer with a first equalizer unit having a basic equalizer stage and a negative impedance cell connected to the basic equalizer stage. Preferably the negative impedance cell has a pair of back to back transistors, and connected thereto a parallel resi... | 07/14/2009 |
| 7539721 | Analog filter with passive components for discrete time signals A filter intended to receive a discrete time signal at a sampling clock frequency, comprising a determined number, greater than 2, of filtering units, each filtering unit comprising head capacitors in a number equal to the determined number, assembled in parallel be... | 05/26/2009 |
| 7499963 | Complex filter with higher order pole Pairs of second-order filters with feedback and cross coupling may be used to implement pairs of complex poles. The cross coupling may be frequency-dependent cross coupling or frequency-independent cross coupling. Frequency independent cross coupling may include cou... | 03/03/2009 |
| 7418469 | Method and apparatus for adaptive real-time signal conditioning, processing, analysis, quantification, comparison, and control Various components of the present invention are collectively designated as Adaptive Real-Time Embodiments for Multivariate Investigation of Signals (ARTEMIS). It is a method, processes, and apparatus for measurement and analysis of variables of different type and or... | 08/26/2008 |
| 7415495 | Selective filter having linear phase A method for determining a filter that is very selective and having linear phase is described. The method starts with choosing a pole constellation in the complex frequency plane in a unique manner so that a desired passband phase of the filter is linear while prese... | 08/19/2008 |
| 7362794 | Channel equalisation A method of reducing multiple access interference in a CDMA radio system uses a plurality of rake fingers to pre-process received signals but without demodulation or de-spreading. The outputs of the rake fingers are combined, normalised and then processed by an adap... | 04/22/2008 |
| 7352826 | Analog delay circuit An analog delay circuit to impart a group delay to an analog input signal is described. The analog delay circuit may comprise a capacitor to impart at least a portion of the group delay to the analog output signal and a buffer circuit coupled between the capacitor a... | 04/01/2008 |
| 7346645 | Architecture for transverse-form analog finite-impulse-response filter A transverse form analog finite impulse response filter. The filter has an input and an output. A first set of passive delay elements connected in serial to the input, and a second set of passive delay elements are connected in serial to the output. Transconductors ... | 03/18/2008 |
| 7346137 | Nonuniform oversampled filter banks for audio signal processing A non-uniform filter bank is created by joining sections of oversampled uniform filter bands that are based on complex exponential modulation (as opposed to cosine modulation). Each filter bank handles a given, non-overlapping frequency band. The bands are not of un... | 03/18/2008 |
| 7340019 | Programmable filter Briefly, in accordance with one embodiment of the invention, a programmable filter may implement an infinite impulse response filter so that a transceiver in which the filter is utilized may be programmable to operate in one or more modes in accordance with one or m... | 03/04/2008 |
| 7318081 | Band-pass filter and tracking signal processor circuit A band-pass filter includes two operational amplifiers. The gm values of the operational amplifiers are each determined by a current flowing through a corresponding transistor for inducing flow of the drive current. The current flowing through the transistor is adju... | 01/08/2008 |
| 7317841 | System and method for image noise reduction using a minimal error spatiotemporal recursive filter Certain embodiments of the present invention provide a system and method for reducing image noise with the use of a minimal error spatiotemporal recursive filter. An input image is filtered both temporally and spatially, producing a temporal output and a spatial out... | 01/08/2008 |
| 7313496 | Test apparatus and test method for testing a device under test A testing apparatus for testing a device under test (DUT) includes a performance board; a main frame for generating a test signal for testing the DUT and determining pass/fail of the DUT based on an output signal output by the DUT; a pin electronics between the main... | 12/25/2007 |
| 7302461 | Analog delay elements Systems and methods provide analog delay elements, which may be utilized in isolation or in a cascade. For example, a delay element may include a broadband amplifier and a passive, programmable filter, which may provide a desired magnitude and group delay response o... | 11/27/2007 |
| 7293057 | Method and apparatus for cancelling inter-symbol interference (ISI) within a communication channel A decision feedback equalizer finite impulse response (DFE FIR) filter for cancelling inter-symbol interference within a signal transmitted through a communication channel. The DFE FIR filter includes a feed-forward equalization path to receive the signal transmitte... | 11/06/2007 |
| 7292071 | Method and circuit for sampling/holding a signal A circuit and method thereof for sampling/holding signal is provided. The signal sampling/holding circuit comprises a first signal sampling/holding device, a second signal sampling/holding device, a target signal and a reference voltage. First, the first signal samp... | 11/06/2007 |
| 7283586 | Adaptive equalizer matched filter error metric concept and apparatus A correlative error detection system (60) for a signal equalizer (10) that corrects a distorted communications signal. The detection system (60) correlates a sequence of bits in a signal from an FFE and/or a DFE processor (12, 14) with a ... | 10/16/2007 |
| 7271648 | Ladder filter, analog equalizer and signal readout system A ladder filter includes multiple inductor sections, each including voltage-controlled current sources and capacitors. A second signal input terminal is provided for the filter separately from an ordinary signal input terminal and a signal, which has been input thro... | 09/18/2007 |
| 7239276 | Method and system for fast synthesis of shaped phased-array beams Calculating the phase shifts assigned to the elements of a phased array antenna such that the resulting beam is shaped to serve a desired area of operation (AOO) has historically been computationally burdensome and often required expert intervention. To maximize com... | 07/03/2007 |
| 7222027 | Spatio-temporal filter for structural health monitoring A method for estimating damage to a structure is provided. The method includes collecting a plurality of damage estimates over time and filtering the plurality of damage estimates with spatio-temporal filters. The method also includes generating an enhanced damage e... | 05/22/2007 |
| 7222055 | High bandwidth real-time oscilloscope A method and apparatus for digitizing a signal. The method comprises the steps of receiving an input analog signal, splitting the received input analog signal into a plurality of signals and frequency converting at least one of the signals in accordance with a prede... | 05/22/2007 |
| 7219037 | High bandwidth oscilloscope A method for improving bandwidth of an oscilloscope involves, in preferred embodiments, the use of frequency up-conversion and down-conversion techniques. In an illustrative embodiment the technique involves separating an input signal into a high frequency content a... | 05/15/2007 |
| 7208903 | Control device for alternating-current motor In one coordinate system of arbitrary rectangular coordinate systems including a coordinate system in which the position of a stator is fixed, a coordinate system in which the position of a rotor is fixed, and a coordinate system which rotates at a rotational freque... | 04/24/2007 |
| 7205816 | Variable-gain-amplifier based limiter to remove amplitude modulation from a VCO output An apparatus and method for generating high-speed clock signals using a voltage-controlled-oscillator (VCO) device. The apparatus implements a linear variable gain amplifier rather than a non-linear hard limiter to remove unwanted signal modulation in VCO output sig... | 04/17/2007 |
| 7206341 | System and method for providing equalization in a multiphase communications receiver A circuit and method for receiving digital signals are disclosed. The circuit includes an input connected to a communications channel over which a digital signal is communicated and operates a plurality of multiple decision circuits at a frequency that is a fraction... | 04/17/2007 |
| 7197053 | Serializer with programmable delay elements A two-bit serializer circuit as described herein includes programmable delay elements having adjustable phase delay that allows for phase tuning of two parallel input signals relative to an output multiplexer select signal. The two parallel input signals are retimed... | 03/27/2007 |
| 7193406 | Data transmitting and receiving apparatus In a TEDS system, a data transmitting and receiving apparatus is provided and a signal transmitted from a TEDS memory to an apparatus side is logically inverted without using a transformer, and further a sneak signal is prevented. Inverters 28, 30 and ... | 03/20/2007 |
