Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 8143942 | Integrated channel filter using multiple resonant filters and method of operation A circuit includes a first filter comprising a first inductor coupled to a first variable capacitor, wherein the first filter is associated with a first resonant frequency. The circuit further comprises an amplifier coupled to the first filter and a second filter co... | 03/27/2012 |
| 8143941 | Active analog filter having a MOS capacitor device with improved linearity An active analog filter (700, 1000) having a MOS capacitor device (730, 1030) with improved linearity is proposed. In an exemplary embodiment, dc bias voltage sources (755, 745) alter the capacitance of MOS varactors (740, 750) connected ... | 03/27/2012 |
| 8111096 | Variable gain amplifier circuit and filter circuit This variable gain amplifier is provided with an operational amplifier. The non-inversion input terminal of the operational amplifier is connected to a reference potential. A feedback resistor is connected between the output terminal and inversion input terminal of ... | 02/07/2012 |
| 8111095 | Temperature compensation for internal inductor resistance An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programmable attenuation and a programmable gain low noise amplifier. Frequency conversion cir... | 02/07/2012 |
| 8076969 | Apparatus for attenuating low frequency signals A high pass filter has a cutoff frequency. The high pass filter includes a first amplifier to receive an input signal. The high pass filter attenuates low frequency signals of the input signal that are below the cutoff frequency. A second amplifier provides an outpu... | 12/13/2011 |
| 8030991 | Frequency tuning and direct current offset canceling circuit for continuous-time analog filter with time divided The present invention provides a frequency tuning/DC offset canceling circuit for continuous-time analog filter with time division, the frequency tuning/DC offset canceling circuit including: a frequency tuning/DC offset canceling unit for performing frequency tunin... | 10/04/2011 |
| 7986181 | Calibration circuit for an adjustable capacitance A calibration circuit for calibrating an adjustable capacitance of a circuit having a time constant depending on the adjustable capacitance, the calibration circuit generating a calibration signal for calibrating the capacitance and including a calibration loop, sui... | 07/26/2011 |
| 7982533 | Transceiving system and compound filter A transceiving system utilizing a shared filter module is provided. The shared filter module is selectively filtering signals in a first band in a first mode and a second band in a second mode. The first mode is a receiver mode whereas the second mode is a transmiss... | 07/19/2011 |
| 7961039 | Forwarded clock filtering Some embodiments include a tunable bandpass filter to provide a filtered output signal; a circuit portion to provide an output signal in response to the filtered output signal; a comparator circuit to provide a comparison signal in response to the output signal from... | 06/14/2011 |
| 7952425 | Adaptive filtering system for patient signal monitoring A system provides a high quality, and intuitive multi-band filter that adapts when noise frequencies or noise amplitudes change. A system for adaptively filtering patient monitoring signals, comprises a filter controller for adaptively determining the number of, and... | 05/31/2011 |
| 7944286 | Systems and methods for filter tuning using binary search algorithm A filter tuning system for quickly compensating a time constant using a binary search algorithm is disclosed. The filter tuning system includes a time constant detector, a comparator and a calibration unit. The time constant detector detects a time constant of a fil... | 05/17/2011 |
| 7932774 | Structure for intrinsic RC power distribution for noise filtering of analog supplies A design structure for intrinsic RC power distribution for noise filtering of analog supplies. The design structure is embodied in a machine readable medium for designing, manufacturing, or testing an integrated circuit. The design structure includes a voltage regul... | 04/26/2011 |
| 7876147 | Background offset cancellation scheme for continuous time gm-C filters The present disclosure describes methods and apparatus for compensating DC offset in a filter having a plurality of transconductance pieces. In one implementation, the method includes measuring a corresponding DC offset associated with each transconductance piece of... | 01/25/2011 |
| 7863972 | Self-calibration of continuous-time filters and systems comprising such filters A continuous-time filter system comprises a master control unit and a slave unit with one or more slave filters. The master control unit includes an integrator having circuit elements which match those elements of the slave filter that define the slave filter's time... | 01/04/2011 |
| 7852146 | Integrated channel filter using multiple resonant filters and method of operation A circuit includes a first filter comprising a first inductor coupled to a first variable capacitor, wherein the first filter is associated with a first resonant frequency. The circuit further comprises an amplifier coupled to the first filter and a second filter co... | 12/14/2010 |
| 7852147 | Autocalibrated controlled MOS switches and applications thereof An integrated circuit includes a signal-path filter, a high-pass filter, and a control circuit. The signal-path filter is configured to receive an input signal and provide an output signal. The high-pass filter is coupled to the signal-path filter and is configured ... | 12/14/2010 |
| 7843257 | Active filter calibration method and apparatus An example bandpass filter calibration system includes a MUX, first and second signal sources coupled to inputs of the MUX, a bandpass filter coupled to an output of the MUX, a rectification circuit including a plurality of rectifiers having a corresponding pluralit... | 11/30/2010 |
| 7816978 | Operating circuit with RC calibration and RC calibration method An operating circuit includes an amplifier having a first input terminal coupled to a reference voltage; a first transconducting element for selectively generating a first current; a second transconducting element for selectively generating a second current; a resis... | 10/19/2010 |
| 7764116 | Cutoff frequency adjusting method, GmC filter circuit and semiconductor device A cutoff frequency adjusting method adjusts a cutoff frequency of a GmC filter circuit which has a capacitor and an Operational Transconductance Amplifier (OTA) circuit with a controllable Gm value. A Gm value of the OTA circuit is detected based on a voltage of the... | 07/27/2010 |
| 7760013 | Transadmittance and filter having a gain function Disclosed are a circuit and a method for tuning a programmable filter including input terminals, output terminals, a filter network and a transadmittance stage. The input terminals can receive input signals, and the output terminals output a filtered signal. The tra... | 07/20/2010 |
| 7755420 | Intrinsic RC power distribution for noise filtering of analog supplies Analog supply for an analog circuit and process for supplying an analog signal to an analog circuit. The analog supply includes a noise filter having a variable resistor, and a control device coupled to adjust the variable resistor. The control device is structured ... | 07/13/2010 |
| 7746166 | Integrated circuit including filter circuit arrangement An integrated circuit includes a filter circuit that has at least one active device, wherein the active device has adjustable transconductance. ... | 06/29/2010 |
| 7737772 | Bandwidth-adjustable filter A bandwidth-adjustable filter includes an operational amplifier, a first resistor, a first capacitor and a first resistor ladder circuit. The operational amplifier has a negative input terminal and a positive input terminal. The first resistor is coupled to one of t... | 06/15/2010 |
| 7733166 | Equalizer filters including a low-pass filter unit and an equalizer having a group delay control unit and related methods Provided is a filter used for an equalizer, the filter including: a first low-pass filter unit receives an input signal and performs low frequency band filtering on the input signal; and an equalization unit that receives an output signal from the first low-pass fil... | 06/08/2010 |
| 7728656 | Signal input circuit A circuit for breaking a signal path has not only a switching means but also a low-pass or bandpass filter whose frequency characteristic is switchable or bypassable. The insulation between the input and the output when the switching means is open, which decreases w... | 06/01/2010 |
| 7719349 | Filter circuit for wireless applications and noise reduction method An object of the present invention is to provide a filter circuit which improves NF of a Gm-C filter. The filter circuit comprises a filter comprising at least one first operational transconductance amplifier whose mutual conductance varies depending on a first cont... | 05/18/2010 |
| 7714643 | Tuning of analog filters Apparatus and methods tune analog filters that are parts of systems. When an analog filter is inserted into a system, the analog filter can be difficult to tune because of the difficulty in observing the analog filter's characteristics without being interfered by ot... | 05/11/2010 |
| 7705667 | Filter adjusting circuit A filter adjusting circuit, has: a filter circuit which has a circuit configuration operating as an n-th order filter including n (n≧1) integrators and can switch a connection of the circuit configuration to operate as a circuit equivalent to the n integrators; a ... | 04/27/2010 |
| 7692484 | Bandwidth calibration of active filter An active RC filter has an op-amp and a biasing circuit arranged to bias the op-amp to set a gain bandwidth product of the op-amp according to a desired pole frequency of the filter. The biasing circuit is operable according to an output of an RC calibration circuit... | 04/06/2010 |
| 7649407 | Digitally tuned, integrated RF filters with enhanced linearity for multi-band radio applications An integrated, multi-band radio frequency (RF) filter is capable of modifying a filter response thereof in response to control information. Switching elements within the filter can be changed between on and off conditions to modify the filter response. In one implem... | 01/19/2010 |
| 7646236 | Method and apparatus for tuning resistors and capacitors A two-step tuning process for resistors and capacitors in an integrated circuit is described. In the first step of the tuning process, an on-chip adjustable resistor is tuned based on an external resistor to obtain a tuned resistor. The value of the tuned resistor i... | 01/12/2010 |
| 7626450 | Method for tuning a tunable filter A method for tuning a tunable filter includes inputting a control signal to the tunable filter and tuning the configuration of the tunable filter according to the control signal. When the control signal is at any one of a plurality of predetermined states, a step si... | 12/01/2009 |
| 7619465 | filter circuit and semiconductor device A filter circuit includes a low-pass filter and a calibration circuit calibrating a frequency characteristic of the low-pass filter. The calibration circuit includes a negative feedback circuit and a control circuit. ... | 11/17/2009 |
| 7554388 | Integrated circuit apparatus According to an aspect of an embodiment, an apparatus comprises: a first current source and a second current source; a resistor connected between the first current source and a reference potential portion; a switched capacitor circ... | 06/30/2009 |
| 7514990 | Very low frequency high pass filter A variable frequency module controls a cutoff frequency of a high pass filter and includes a resistive element that communicates with a capacitive element of the high pass filter. A first transistor communicates with the resistive element and a reference node and in... | 04/07/2009 |
| 7492216 | Filtering apparatus for correcting variation of CR-product A filtering apparatus includes a main filter, a variation detection circuit, and a variation correction circuit. The variation detection circuit includes a reference filter having at least one resistor and at least one capacitor, detects a variation of CR-product ba... | 02/17/2009 |
| 7477099 | Filter adjustment circuit In a filter adjustment circuit for an analog filter circuit such as a Gm-C filter, an input signal IS from a reference signal generation circuit 1 is inputted to a Gm-C filter 2 to be filtered and then converted by a conversion circuit 3 to a di... | 01/13/2009 |
| 7477098 | Method and apparatus for tuning an active filter A tuning circuit for tuning an active filter includes a resistor-capacitor circuit comprising a variable capacitor and a resistor equivalent to a first resistor and a second resistor serially connected to the first resistor, a voltage generator for providing a const... | 01/13/2009 |
| 7468629 | Tuning circuit for transconductors and related method Tuning circuits and related method for tuning transconductance in a transconductor-capacitor (Gm-C) filter system are provided. In the tuning circuit, a periodic input signal with constant amplitude triggers a transconductor cell to charge/discharge a capacitor for ... | 12/23/2008 |
| 7463085 | Tuning circuit The present invention relates to a filter and, more particularly, to a tuning circuit of a filter for correcting a cut-off frequency of the filter. The tuning circuit comprises a current generation unit having a first transistor and a variable resistor unit, and a c... | 12/09/2008 |
