Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 7825722 | High pass filter chip A high pass filter chip with a large size capacitor is disclosed. The high pass filter chip includes a fully-differential sensing device circuit. The fully differential sensing device circuit includes a first amplifier circuit, a second amplifier circuit, and a mill... | 11/02/2010 |
| 7764117 | Method and system for reducing a dynamic offset during the processing of asymmetric signal strings A method and a system for reducing a dynamic offset during the processing of asymmetric signal strings includes reducing a dynamic offset which allows a reduction of any disturbing influence on subsequent process steps. In every no-pulse period a capacitor is discha... | 07/27/2010 |
| 7649409 | All-pass termination network with equalization and wide common-mode range An integrated circuit comprises a pin coupled to receive signals from outside the integrated circuit and an input network. The input network equalizes incoming signals by attenuating lower frequency input signals more than higher frequency input signals received at ... | 01/19/2010 |
| 7622985 | Active compensation filter An active compensation filter for the application in the electric power supply in a land vehicle, which comprises a high-pass filter which is to be coupled with a supply voltage line which carries a supply voltage, in order to detect frequency and amplitude of inter... | 11/24/2009 |
| 7429889 | Control system for programmable filters Control system for programmable filters, master-slave calibration system and fully programmable high precision filter for use in such control system, such filters being provided with a filter input and a filter output including a first, first order low pass filter s... | 09/30/2008 |
| 7365668 | Continuous-time delta-sigma analog digital converter having operational amplifiers The invention concerns a continuous-time delta-sigma analog-digital converter for the conversion of an analog input signal into a digital output signal, comprising an analog filter which filters the analog input signal and at least one externally circuited operation... | 04/29/2008 |
| 7358799 | Switchable high pass configuration and an optical receiver with a switchable high pass configuration The invention relates to a switchable high-pass filter arrangement which has a lower limiting frequency determining the high-pass filter behavior. The arrangement includes a transistor circuit, which has at least one transistor in a common-gate or common-base connec... | 04/15/2008 |
| 7310508 | Inline filter resistors A shorted resistive block formed in line with at least one trace of a plurality of a top metal layer includes a plurality of resistors with a removable shorting link coupled across the resistive block. The resistive block comprises one of a plurality of series coupl... | 12/18/2007 |
| 7301992 | Multipath processing for GPS receivers A GPS receiver system determines the presence of trackable signals at code delays less than the prompt delay being tracked for a particular, signal and changes the prompt delay to correspond to the smallest code delay having a trackable signal. Trackable signals at ... | 11/27/2007 |
| 7295633 | Triple multiplexing spread spectrum receiver A GPS car navigation system derives GPS position update information from motion of the car along the actual track. Turns along the track are detected when they actually occur and are compared with the predicted turns so that the time and position at the actual turn ... | 11/13/2007 |
| 7276986 | Method and apparatus for improving signal integrity in a high speed flex cable A method for decreasing high-frequency attenuation effects in a flexible cable includes communicatively coupling signal-enhancing circuitry to a signal layer of the flexible cable. ... | 10/02/2007 |
| 7271623 | Low-power receiver equalization in a clocked sense amplifier A receiver includes clocked, differential equalization circuitry to compensate for signal attenuation that varies with the frequency of the input signal received over a respective communication channel. The incoming signal is split into filtered and unfiltered signa... | 09/18/2007 |
| 7184099 | Controllable signal baseline and frequency emphasis circuit A circuit for selectively controlling signal baseline and frequency emphasis. An amplifier with selectively controllable feedback circuitry allows higher frequency components of a signal to be emphasized over lower frequency components while also allowing control ov... | 02/27/2007 |
| 7180357 | Operational amplifier integrator An integrator circuit comprises an operational amplifier which has a transistor stage (1) with an input terminal (4) and an output terminal(3), a feedback capacitor (2) connected between the input terminal (4) and the output termin... | 02/20/2007 |
| 7164901 | DC offset-free RF front-end circuits and systems for direct conversion receivers A DCR RF front-end removes the DC term resulting from mixer port to port leakage and feeds RF and LO signals into the mixers with different phase combinations. The signal inputs to the mixers result in the intermediate frequency (IF) output of mixers being 180 degre... | 01/16/2007 |
| 7118532 | Data dependent color wall filters The present invention generally relates to ultrasound. In particular, the present invention relates to data dependent color wall filters (used in ultrasound imaging devices for example). Certain embodiments of the present invention relate to a color wall filter that... | 10/10/2006 |
| 7098630 | Control means and methods for a transistor switch circuit The invention relates to a control means and method for a transistor switch circuit controlling a power supply circuit for providing electric power to a load, comprising: a power supply stage having an LC circuit with an inductor, and a control stage having an estim... | 08/29/2006 |
| 7081790 | Adjustable bandwidth high pass filter for large input signal, low supply voltage applications Often programmable gain attenuators (PGAs) are combined with high pass filters. Adjustment of the highpass filter however can have unintended effects, such as changing the step size of the PGA. By placing the resistance of the highpass filter in parallel with a prog... | 07/25/2006 |
| 7049859 | Variable threshold comparator interface circuit A signal processing circuit includes a comparator having a fixed and a variable reference input for detection of a positive quasi-sinusoidal waveform pulse. A signal detection circuit includes a low pass input filter, a voltage input clamp, a variable detection thre... | 05/23/2006 |
| 7038532 | Switched-capacitor high-pass mirrored integrator In a high-pass (mirrored) integrator structure that employs chopper modulation, the input and output of the mirrored integrator are connected to the input and output ports of the operational amplifier, bypassing the chopper stabilization modulators. The mirrored int... | 05/02/2006 |
| 7038533 | Gigabit ethernet transceiver with analog front end Circuitry to remove switches from signal paths in integrated circuit programmable gain attenuators. Programmable gain attenuators and programmable gain amplifiers commonly switch between signal levels using semi-conductor switches. Such switches may introduce non-li... | 05/02/2006 |
| 7002417 | RC and SC filter compensation in a radio transceiver Disclosed is apparatus for operating with an RC filter (26, 26A), and a corresponding method. The apparatus includes circuitry (32) for use in measuring an actual value of at least one filter component and a controller (34), coupled to the measu... | 02/21/2006 |
| 6999518 | Receiver and transmission in a transmission system A transmission system structure including a signal receiver and a signal transmitter. The signal transmitter that transmits a differential input signal pair to the transmission line is mainly used for pre-charging the input terminal of the signal receiver to a prede... | 02/14/2006 |
| 6995606 | High pass filter using insulated gate field effect transistors A high pass filter comprising a combination of capacitors and insulated gate field effect transistors (IGFETs) used as effective resistors provides a low break frequency, while providing improved linearity and a stable break frequency over a relatively wide range of... | 02/07/2006 |
| 6975848 | Method and apparatus for DC offset removal in a radio frequency communication channel A filter module for reducing a DC offset voltage in a radio frequency communication channel is described. A first capacitor is coupled between a first differential input node and a first differential output node. A second capacitor is coupled between a second differ... | 12/13/2005 |
| 6975158 | Noise canceling circuit A low-pass filter eliminates a high-frequency component contained in an input signal. An inverter outputs a signal at a high level or a low level in response to an output of the low-pass filter that is larger or smaller than a threshold level. A one-shot pulse gener... | 12/13/2005 |
| 6917644 | Spread spectrum receiver with multi-path correction A spread spectrum receiver uses a comparison of the magnitude of the code correlation amplitudes at equal power at a one chip spacing to the magnitude at a central position there between to determine if multipath interference is present. The lead or lag error from c... | 07/12/2005 |
| 6894558 | Adjustable bandwidth high pass filter for large input signal, low supply voltage applications Often programmable gain attenuators (PGAs) are combined with high pass filters. Adjustment of the highpass filter however can have unintended effects, such as changing the step size of the PGA. By placing the resistance of the highpass filter in parallel with a prog... | 05/17/2005 |
| 6882216 | On-chip high-pass filter with large time constant An on-chip high-pass filter with large time constant comprising a capacitor, a first transistor having a first terminal connected to a first voltage source and a second terminal connected to the capacitor, and a second transistor having a first terminal connected to... | 04/19/2005 |
| 6744306 | Filter circuit A filter circuit includes two first differential circuits disposed on A and B sides, in each of which a ratio of the number of transistors to that of diodes is 1:4, and two second differential circuits disposed on the A and B sides, in each of which the ratio of the... | 06/01/2004 |
| 6744307 | Filter circuit A filter includes a capacitor (1) connected between the input end IN and the output end OUT of signals and constant current circuits (2, 3) of MOS structure connected between the power source VDD and the ground, and by connecting the output side node o... | 06/01/2004 |
| 6731160 | Adjustable bandwidth high pass filter for large input signal, low supply voltage applications Often programmable gain attenuators (PGAs) are combined with high pass filters. Adjustment of the highpass filter however can have unintended effects, such as changing the step size of the PGA. By placing the resistance of the highpass filter in parallel with a prog... | 05/04/2004 |
| 6593804 | Controllable high frequency emphasis circuit for selective signal peaking A signal peaking circuit for selectively emphasizing, or boosting, the higher frequencies of an incoming signal. A frequency emphasis circuit with an overall high pass transfer characteristic selectively emphasizes higher frequency signal components over ... | 07/15/2003 |
| 6545569 | Filtering device and method of eliminating a DC component by shifting the transfer function Filters and methods for eliminating a DC component from an electronic signal provide for circuitry having a zero corresponding to a cut-off frequency, and circuitry for shifting the zero by an amount corresponding to the absolute value of that cut-off fre... | 04/08/2003 |
| 6516069 | Microphone filter and microphone unit A large-time-constant microphone filter which contains resistance and capacitance as its constituent and can be formed in the same semiconductor chip as a microphone unit is achieved, which results in downsizing and cost reduction of the microphone unit. ... | 02/04/2003 |
| 6420927 | Filter and hold circuit utilizing a charge/discharge current The subject invention pertains to a method and circuit design particularly useful for long time constant RC active or passive circuits in either continuous or discrete time domains. The subject invention also relates to a method and circuit design useful ... | 07/16/2002 |
| 6388511 | Filter circuit Offers a filter circuit in which the dedicated capacitor surface area is small and in which a dedicated process just for capacitor formation is unnecessary. The filter circuit of this invention is an active filter circuit wherein an operational amplifier ... | 05/14/2002 |
| 6340913 | Filter circuit with positive feedback loop A filter circuit comprising a phase advance circuit acting as a high pass filter, a phase retard circuit acting as a low pass filter, and an amplifier connected in series between an input and an output. A positive feedback loop is provided between the inp... | 01/22/2002 |
| 6335656 | Direct conversion receivers and filters adapted for use therein A direct conversion receiver having a homodyning section fed by a received radio frequency signal having a carrier frequency and reference signal having the carrier frequency; and a filter coupled to the monodyning section. The filter includes a plurality... | 01/01/2002 |
| 6271719 | Operational filter building block A 3-terminal operational filter circuit is presented that can be used to construct various types of active filters. The filter circuit can be configured to provide 2nd order low pass and band-pass frequency responses by coupling three resistors to the thr... | 08/07/2001 |
