Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 8098094 | Instrumentation input systems An input stage for an instrumentation system may include a resistor coupled between an input terminal and a summing node, and an amplifier arranged to maintain the voltage at the summing node. In anther embodiment, an instrumentation input system may include an inpu... | 01/17/2012 |
| 8030996 | Apparatus and method for automatic level control A circuit and method for automatic level control is provided. The circuit includes an amplifier including a variable resistance circuit that is connected between a first node and a second node. The circuit also includes a first resistance circuit that is connected b... | 10/04/2011 |
| 7808314 | Circuit for adjusting an impedance The invention relates to a circuit for adjusting an impedance between two terminals, said impendance including the input impedance of the circuit. The aim of the invention is to enlarge the adjustment range and to stabilize—the operating behavior of such a circuit... | 10/05/2010 |
| 7400164 | Integrated circuit and method of improving signal integrity An Integrated Circuits (ICs) comprising a first output stage circuit and a second output stage circuit that share common input terminals and an output terminal of the first and second output stage circuits being selectably coupled between the input terminals and the... | 07/15/2008 |
| 7361851 | Weighing apparatus and system A weighing apparatus comprises a plurality of load cells and a load platform, supported by the load cells. The apparatus includes means associated with each load cell to supply a digital representation of the load on each load cell. The load cells are connected toge... | 04/22/2008 |
| 7352238 | dB-linear analog variable gain amplifier (VGA) realization system and method A dB-linear variable gain amplifier, a method for creation, and a system includes an amplifier; a pair of resistor arrays operatively connected to the amplifier, wherein each resistor array comprises MOS transistor resistive switches; a differential ramp-generator c... | 04/01/2008 |
| 7336130 | Attenuator, variable gain amplifier using the same, and electronic equipment An attenuator attenuates input signals and outputs the signals to an amplifier arranged to amplify signals applied to two input terminals. The attenuator includes first and second output terminals to be respectively connected to the two input terminals of the amplif... | 02/26/2008 |
| 7333778 | System and method for current-mode amplitude modulation An amplifier circuit includes a power amplifier biased for saturated mode operation, and a controllable current source to provide supply current to the power amplifier. The controllable current source effects desired amplitude modulation of the output signal from th... | 02/19/2008 |
| 7312659 | Multi-amplifier circuit An amplifier circuit includes first, second, third and fourth transconductance amplifiers that each have an input, an output and a transconductance gain. The outputs of the first, second and third amplifiers communicate with the inputs of the second, third and fourt... | 12/25/2007 |
| 7292829 | Power amplifier efficiency The present invention relates to a method and an arrangement for optimizing the efficiency of a power amplifier (1) that is utilized for transmission of radio signals in a portable radio communication device, such as a mobile phone. The impedance loading the ... | 11/06/2007 |
| 7292096 | Amplifier A high power amplifier having high efficiency, compact and low cost characteristics based on the simple circuit structure effectively used over a wide range of the output power. A control circuit controls power supply operations of the power supply unit such that a ... | 11/06/2007 |
| 7289575 | Signal processing means A non-linearity generator operates on a signal between a frequency converter and an amplifier and acts as a postdistorter for the component it follows and as a predistorter for the component it precedes, thus linearizing the overall input-output characteristic of th... | 10/30/2007 |
| 7286012 | Operational amplifier circuit with controllable intermediate circuitry set therein An operational amplifier circuit includes an operational amplifier, an intermediate circuitry, and a control circuitry. The intermediate circuitry is coupled to a load. The operational amplifier is coupled to the intermediate circuitry and drives the load through th... | 10/23/2007 |
| 7279968 | Amplifier output voltage swing extender circuit and method An amplifier output voltage swing extender circuit comprises a differential amplifier powered between first and second power supply rails, which receives first and second input signals at non-inverting and inverting inputs, respectively, and provides an output at a ... | 10/09/2007 |
| 7276969 | Multi-amplifier circuit A transimpedance amplifier circuit includes a first amplifier with an input, an output and a first transconductance. A second amplifier has an input that communicates with the output of the first amplifier, an output and a second transconductance. A first resistance... | 10/02/2007 |
| 7239205 | High frequency amplifier circuit and mobile communication terminal using the same A first FET is inserted in a series position between a signal input terminal and a signal output terminal, while second and third FETs are inserted in a shunt position respectively between the signal input terminal and a ground terminal and between the signal output... | 07/03/2007 |
| 7231325 | System for evaluating a sensor signal The inventive device for evaluating the sensor signal includes the provider for providing the sensor signal, the processor for processing the sensor signal and for providing an information signal comprising information regarding the amplitude course of the sensor si... | 06/12/2007 |
| 7202747 | Self-tuning variable impedance circuit for impedance matching of power amplifiers A self-tuning variable impedance circuit provides improved performance. A variation in the power applied to the variable impedance circuit causes a corresponding change in the impedance of the circuit, resulting in improved performance. For example, the variable imp... | 04/10/2007 |
| 7190221 | Method and apparatus for maintaining constant linearity for a power amplifier over varying load conditions A circuit and method for applying a dynamically varying collector voltage to a power amplifier is presented. A desired output power is determined, and an input and output power of a power amplifier are measured. A processor determines, for the measured input power a... | 03/13/2007 |
| 7151230 | Weighing system A system for weighing a load that uses a weighing apparatus comprising a plurality of load cells (1), a means for receiving a load supported by said load cells, a means associated with each load cell (1) to supply a digital representation of the load o... | 12/19/2006 |
| 7148701 | Apparatus for measuring electrical impedance The present invention provides an apparatus for measuring electrical impedance comprising: two input electrodes contacted to a subject for measuring impedance; a difference amplifier to which two signals inputted to the two input electrodes are inputted; a device fo... | 12/12/2006 |
| 7135931 | Negative conductance power amplifier Power amplifiers are disclosed that demonstrate improved linearity and efficiency in applications requiring significant peak-to-average ratios (PAR). A power amplifier in accordance with the present invention comprises a first transistor in an input stage that conve... | 11/14/2006 |
| 7133478 | Device and method for detecting and suppressing noise A device for detecting and suppressing noise includes a noise detection device that receives and processes an input signal to determine if the input signal contains noise and provides a detected noise signal indicative of whether or not noise is detected in the inpu... | 11/07/2006 |
| 7110742 | Low noise amplifier with constant input impedance A low noise amplifier includes an input transistor, an inductor, and a current sink. The input transistor includes a gate, a drain, and a source, wherein the gate of the input transistor is operably coupled to receive an input radio frequency (RF) signal. The induct... | 09/19/2006 |
| 7106132 | Feed-forward operational amplifiers and methods of using the same A feed-forward operational amplifier including a dedicated summer circuit for summing a signal generated by a first amplifier stage of a feed-forward amplifier and a signal received from an external source to generate a sum signal and a second amplifier stage couple... | 09/12/2006 |
| 7098732 | Multi-stage variable gain amplifier utilizing overlapping gain curves to compensate for log-linear errors A multi-stage variable gain amplifier is disclosed that utilizes overlapping gain curves to compensate for log-linear errors. Each gain stage is configured to approximate a log-linear response with a sinusoidal error term such that a portion of the curve has positiv... | 08/29/2006 |
| 7071782 | HF amplifier with switchable gain A device for amplifying or attenuating HF signals is characterized in that a transistor is connected in a common-emitter configuration in amplifying operation, and a base-collector diode is connected in the forward-biased direction for attenuating operation. ... | 07/04/2006 |
| 7046750 | Adaptive signal weighting system A system for decoding an electrical input signal includes a filter that impresses a variable gain on the portion of input signal to deemphasize a spectral region of the input signal. The variable gain is set as a function of a variable gain control signal. A frequen... | 05/16/2006 |
| 7038541 | Adaptive feed-forward amplifiers and the like According to one embodiment, for an amplifier circuit employing feed-forward distortion compensation, phase and amplitude adjusters in the carrier cancellation and error cancellation loops can be continuously and simultaneously controlled to compensate for changes i... | 05/02/2006 |
| 6985021 | Circuits and techniques for conditioning differential signals Circuitry is provided that conditions a differential input signal such that when the signal is received by a multi-standard differential input buffer, the buffer is able to process the conditioned signal without pronounced increases in propagation delay, thereby kee... | 01/10/2006 |
| 6965837 | Method and arrangement for detecting load mismatch, and a radio device utilizing the same A method and an arrangement for detecting impedance mismatch between an output of a radio frequency amplifier (200, 901, 911, 921, 1101) which has an amplifying component (201, 301, Q46, 701, 801) and an input of a load (203, 302) coupled... | 11/15/2005 |
| 6958648 | Programmable gain amplifier with glitch minimization A programable gain amplifier (PGA) has an amplifier and a variable resistor that is connected to the output of the amplifier. The variable resistor includes a resistor that is connected to a reference voltage and multiple parallel taps that tap off the resistor. A t... | 10/25/2005 |
| 6952144 | Apparatus and method to provide power amplification Briefly, in accordance with an embodiment of the invention, an apparatus and method to increase efficiency of a power amplifier is provided. The apparatus may include a power amplifier, and a variable impedance matching circuit coupled to the power amplifier to impr... | 10/04/2005 |
| 6937977 | Method and apparatus for processing an input speech signal during presentation of an output audio signal A start of an input speech signal is detected during presentation of an output audio signal and an input start time, relative to the output audio signal, is determined. The input start time is then provided for use in responding to the input speech signal. In anothe... | 08/30/2005 |
| 6922093 | Radio frequency amplifier and method of driving the same A radio frequency amplifier and a method of driving the radio frequency amplifier which are excellent in the controllability at the time of a low power output while keeping the advantage of a high efficiency and give the heating generated by a power loss of such a d... | 07/26/2005 |
| 6906584 | Switchable gain amplifier having a high-pass filter pole The present invention provides a switchable gain amplifier comprising a high-pass filter pole. The switchable gain amplifier comprises first and second input nodes for receiving first and second components of a differential input signal. A first input terminal of a ... | 06/14/2005 |
| 6888405 | Programmable gain amplifier with glitch minimization A programable gain amplifier (PGA) has an amplifier and a variable resistor that is connected to the output of the amplifier. The variable resistor includes a resistor that is connected to a reference voltage and multiple parallel taps that tap off the resistor. A t... | 05/03/2005 |
| 6861903 | Signal coupling systems with enhanced isolation and dynamic range Signal coupling systems are provided which enhance signal isolation and dynamic range with structures that increase bias voltages in upstream signal amplifiers to guard against transistor saturation that would otherwise increase current drain, reduce response time a... | 03/01/2005 |
| 6836184 | Network amplifier with microprocessor control A network amplifier is provided. The network amplifier includes a variable equalizer having at least one control input and a variable attenuator having at least one control input. The network amplifier also includes at least one amplifier circuit that is coupled in ... | 12/28/2004 |
| 6825717 | Feedback network and amplifier and/or converter circuit with a feedback network A feedback network for connecting an output of an operational amplifier with a feedback input of the operational amplifier, wherein the feedback network comprises a feedback circuit. The feedback network comprises a semiconductor switch in series to the feedback cir... | 11/30/2004 |
