Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7304535 | Balanced amplifier A balanced amplifier is disclosed as comprising an input stage connected with a second stage, in which the input stage outputs signals to the second stage, and the first stage includes a first differential amplifier for receiving balanced input signals and is provid... | 12/04/2007 |
| 7283840 | Reconfigurable analog baseband for a single-chip dual-mode transceiver A dual-mode analog baseband circuit is implementable on a single IC with reduced chip area. The baseband portion of the IC includes a single dual-mode complex filter that is reconfigurable to be a filter for Bluetooth signals or for wireless local area network (wire... | 10/16/2007 |
| 7276965 | Nested transimpedance amplifier A nested transimpedance amplifier (TIA) circuit includes a zero-order TIA having an input and an output. A first operational amplifier (opamp) has an input that communicates with the output of the zero-order TIA and an output. A first feedback resistance has one end... | 10/02/2007 |
| 7265632 | Amplifier circuit, and system incorporating same In one embodiment, a current source circuit having a reference resistor produces first, second and third bias currents that vary with manufacturing variances of the current compensation resistor. An input amplification stage includes a transconductance stage biased ... | 09/04/2007 |
| 7245887 | High speed CMOS transmit-receive antenna switch A high-speed CMOS transmit/receive antenna switch includes a first transistor, a second transistor and a parasitic compensation network. The first transistor is operably coupled to an antenna, to a transmit path, and to receive a transmit/receive (T/R) control signa... | 07/17/2007 |
| 7173486 | Nested transimpedance amplifier with capacitive cancellation of input parasitic capacitance A nested transimpedance amplifier (TIA) circuit comprises a zero-order TIA having an input and an output. A first transconductance amplifier has an input that communicates with said output of said zero-order TIA and an output. A first feedback resistance has one end... | 02/06/2007 |
| 7164318 | Continuous variable-gain low-noise amplifier Continuous variable-gain low-noise amplifier. The amplifier continuously adjusts its gain between well-defined high and low values by using a cascode current-steering circuit to partition signal current between two different nodes of an output loading network. A shu... | 01/16/2007 |
| 7120399 | High speed CMOS transmit-receive antenna switch A high-speed CMOS transmit/receive antenna switch includes a first transistor, a second transistor and a parasitic compensation network. The first transistor is operably coupled to an antenna, to a transmit path, and to receive a transmit/receive (T/R) control signa... | 10/10/2006 |
| 6956431 | Pulse width modulation amplifier A pulse width modulation (PWM) amplifier which is capable of reducing unwanted radiation from a PWM output thereof, which can cause EMI, while reducing manufacturing costs thereof. A triangular wave-generating circuit (3) of the PWM amplifier outputs a triang... | 10/18/2005 |
| 6952159 | Coupling device A coupling apparatus (1) having a mains connection (2) for connection to a low-voltage mains power supply system, and having an appliance connection (3) for connection of any appliance for transmitting and/or receiving an RF signal has a voltage... | 10/04/2005 |
| 6943623 | Amplification circuitry Amplification circuitry for driving a load in response to an input signal, comprising: a phase locked loop, for producing a pulse width modulated signal for driving the load and input circuitry arranged to control the phase locked loop and vary the pulse width modul... | 09/13/2005 |
| 6930548 | Method and system for improving amplifier efficiency One aspect of the invention is an amplifier (10), comprising an input stage amplifier (20) coupled to an output node (81). The amplifier (10) further comprises a class D output stage (50), which comprises at least two switching ele... | 08/16/2005 |
| 6873703 | Precision, low-power current-sense transmission channel for subscriber line interface circuit, programmable with single ended impedances and capable of exhibiting a voltage sense response A transmission channel for a subscriber line interface circuit comprises a front end, tip/ring current-sensing transimpedance stage, containing relatively low valued tip and ring sense resistors coupled in circuit with tip and ring paths of a telecommunication wirel... | 03/29/2005 |
| 6836182 | Nested transimpedance amplifier A nested transimpedance amplifier (TIA) circuit includes a zero-order TIA having an input and an output. A first operational amplifier (opamp) has an input that communicates with the output of the zero-order TIA and an output. A first feedback resistor has one end t... | 12/28/2004 |
| 6833757 | Method and system for improving amplifier efficiency One aspect of the invention is an amplifier (10), comprising an input stage amplifier (20) coupled to an output node (81). The amplifier (10) further comprises a class D output stage (50), which comprises at least two switching ele... | 12/21/2004 |
| 6801089 | Continuous variable-gain low-noise amplifier Continuous variable-gain low-noise amplifier. The amplifier continuously adjusts its gain between well-defined high and low values by using a cascode current-steering circuit to partition signal current between two different nodes of an output loading network. A shu... | 10/05/2004 |
| 6801087 | Integrated circuit with an analog amplifier An integrated circuit includes an analog amplifier connected to a terminal pad and has a Miller compensation of a section of the analog amplifier. The Miller compensation circuit is connected to a terminal for reference-ground potential through a capacitive element.... | 10/05/2004 |
| 6771711 | Digital GMSK filter A digital GMSK filter for use for frequency modulation of a carrier signal in a GMSK transmission system is described. The GMSK filter uses a large number of individual current sources, whose current values are individually weighted. The current sources are driven v... | 08/03/2004 |
| 6765438 | Transconductance power amplifier A transconductance power amplifier for amplifying a signal to a capacitive load, including a first N-channel enhancement MOSFET transistor operatively arranged to source current to the capacitive load, wherein the first N-channel MOSFET transistor has a threshold ga... | 07/20/2004 |
| 6762644 | Apparatus and method for a nested transimpedance amplifier A nested transimpedance amplifier (TIA) circuit includes a zero-order TIA having an input and an output. A first operational amplifier (opamp) has an input that communicates with the output of the zero-order TIA and an output. A first feedback resistor has one end t... | 07/13/2004 |
| 6756851 | Transimpedance amplifier Transimpedance amplifier having an input stage (1) to which an input current to be amplified is fed and an output stage (2) which outputs an output voltage (uo) corresponding to the amplified input current. By means of a current control circ... | 06/29/2004 |
| 6580326 | High-bandwidth low-voltage gain cell and voltage follower having an enhanced transconductance A voltage buffer and follower includes a single ended output, a source follower, and a current feedback loop. The current feedback loop is coupled to the source follower and to the single ended output. When two voltage followers are used in a differential... | 06/17/2003 |
| 6573791 | Multipath nested Gm nested miller compensation A compensated three stage amplifier having high gain as well as high speed is disclosed. The amplifier comprises a NMC and NGCC compensated cascaded three stage amplifier for receiving an input signal and for providing an amplified output signal in depend... | 06/03/2003 |
| 6501335 | Semiconductor circuit with a stabilized gain slope Realizing a stabilized gain slope without increasing circuit scale or entailing extra time or care for correcting impedance. A resonant circuit that is made up of a capacitor and an inductor is provided in an output stage outside a feedback loop for reali... | 12/31/2002 |
| 6476678 | High performance amplifier circuits using separate power supplies The present invention is an apparatus and method to provide a high supply rejection and a full rail-to-rail output swing in an amplifier circuit. A first stage generates a first output. The first stage is powered by a second supply. A second stage is coup... | 11/05/2002 |
| 6388516 | Precision high speed magnetic coil driver circuit Accuracy of correction of offset drift with temperature and noise are corrected in a high voltage, high current amplifier is improved by thermal isolation and/or temperature regulation of another amplifier having greater gain and connected to a different ... | 05/14/2002 |
| 6353367 | Cascode amplifier integrated circuit with reduced miller capacitance at an output buffer stage during a transient fall response A cascode amplifier integrated circuit (IC) with a relatively fast transient fall response (i.e., short transient fall response time) and, therefore, relatively fast operation. The cascode amplifier IC includes a bias input terminal configured to receive ... | 03/05/2002 |
| 6208206 | Frequency compensation techniques for low-power multistage amplifiers A three stage amplifier is disclosed provided with a novel frequency compensation technique. Only a single feedback loop with a single compensation capacitance is provided. Instead of a conventional nested compensation technique, damping factor control is... | 03/27/2001 |
| 6177963 | Video signal distribution system A video signal distribution system comprises an interface device and video signal input means for receiving TV signals on broadcast channels connected to the interface device. A plurality of video appliances and a plurality of TV sets may be connected to ... | 01/23/2001 |
| 6175274 | Switched gain low noise amplifier A low noise amplifier for use in communications electronics includes first and second gain stages, switching circuitry that can switch the output of the first stage between the collector (common-emitter configuration) and the emitter (emitter-follower con... | 01/16/2001 |
| 6118991 | Device including a broadband amplifier circuit A device having a broadband amplifier circuit is disclosed in which the amplifier circuit includes at least two field effect transistor stages with low transistors arranged as amplifiers and high transistors arranged as load transistors. The device has se... | 09/12/2000 |
| 6061238 | Information processing apparatus, method of arranging components of the apparatus, and heat sink An information processing apparatus includes a plurality of processor boards arranged parallelly on the main board and the DC--DC converters for generating operation voltages for processor devices each disposed between the adjacent processor boards. Furth... | 05/09/2000 |
| 6028487 | Negative-feedback amplifier circuit capable of independently controlling a gain and an impedance A plurality of field effect transistors (FET's) (11, 12) are coupled in cascode connection. A drain of the final-stage FET (12) is coupled to a gate of the first-stage FET (11) through a first negative-feedback circuit (13). A drain of the first-stage FET... | 02/22/2000 |
| 5815040 | Wide bandwidth, current sharing, MOSFET audio power amplifier with multiple feedback loops A wide bandwidth, multi-FET current sharing output stage, MOS audio power amplifier employs multiple feedback loops. An audio input is supplied to a voltage feedback amplifier stage driving a push-pull voltage gain/phase splitter stage. A bias adjustment ... | 09/29/1998 |
| 5745010 | Operational amplifier An operational amplifier including reverse amplifiers interconnected in series in an odd number of stages not less than three, an element for feeding back an output from the reverse amplifier in the last stage to an input of the reverse amplifier in a fir... | 04/28/1998 |
| 5705951 | Method for correction of error signals in a signal amplification system and an apparatus used for that purpose In a method and by an apparatus for correction of error signals and for forming of an arbitrary transfer function being independent of the quality of a payload (loudspeaker; H1) included in a signal amplification system, a control system (9) is used for s... | 01/06/1998 |
| 5705950 | Hybrid solid state/vacuum tube audio amplifier In this hybrid amplifier circuit the vacuum tube is direct coupled or DC coupled to the output of a solid state amplifier in a cathode follower configuration. An automatically operative bypass component, such as a Zener diode, LED, transistor junction or ... | 01/06/1998 |
| 5453704 | Sense amplifier with positive feedback and self-biasing to achieve full voltage swing A level shift amplifier has first to n th inverters connected in series, with each positive voltage terminal of the first to n th inverter is connected to the first source line. Each negative voltage terminal of the first to (n-2)th inverter is connected ... | 09/26/1995 |
| 5371479 | Pre-amplifier with multi-stage feedback A circuit for amplifying an input signal comprises an operational amplifi a dual operational amplifier, and a buffering operational amplifier all cascaded in the aforementioned order. The first operational amplifier amplifies the input signal with minimu... | 12/06/1994 |
| 4879525 | High gain RF amplifier with directional coupler feedback A high gain RF amplifier comprises first and second common-emitter transistor amplifier stages coupled in cascade between an RF input terminal to which RF signals to be amplified are applied and an RF output terminal from which amplified RF signals are de... | 11/07/1989 |
