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 |
| 8183906 | Arrangement, use of an arrangement, reference voltage source and method for generating a voltage value linearly proportional to the temperature The invention relates to an arrangement comprising a logarithmizing unit and a subtracting unit, wherein the subtracting unit has an output at which a voltage value linearly proportional to the temperature can be tapped off. ... | 05/22/2012 |
| 8164377 | Signal dependent compensation with matched detectors A detector circuit includes a main path having a first detector to generate an output signal in response to an input signal, and a reference path having a second detector matched to the first detector to generate a reference signal in response to the input signal. T... | 04/24/2012 |
| 8004341 | Logarithmic circuits An embodiment of a logarithmic circuit may include a logging transistor, a guard circuit arranged to force an input current into an input terminal of the logging transistor, and a positioning circuit arranged to maintain a voltage of the logging transistor. The guar... | 08/23/2011 |
| 7969223 | Temperature compensation for logarithmic circuits An embodiment of a logarithmic circuit may include a logging transistor, and a multi-tanh circuit arranged to provide temperature compensation to the logging transistor, where the multi-tanh circuit comprises a multiplicity of multi-tanh cells. In another embodiment... | 06/28/2011 |
| 7952416 | Logarithmic temperature compensation for detectors The intercept of a logarithmic amplifier is temperature stabilized by generating a signal having the form H log H where H is a function of temperature such as T/T0. The first H factor is cancelled, thereby generating a correction signal having the form Y ... | 05/31/2011 |
| 7777552 | Logarithmic amplifier with RMS post-processing An RF measurement system includes an envelope detector to extract the modulation envelope of the RF input signal. The resulting baseband envelope signal is then applied to a statistics extraction circuit which provides a precise measure of the modulation envelope. T... | 08/17/2010 |
| 7683694 | Low noise logarithmic detector A logarithmic detector circuit including a drive circuit to receive a modulated input signal and generate a buffered modulated signal, a signal shaping circuit coupled to the drive circuit and configured to shape a voltage range of the buffered modulated signal to g... | 03/23/2010 |
| 7616044 | Logarithmic temperature compensation for detectors The intercept of a logarithmic amplifier is temperature stabilized by generating a signal having the form H log H where H is a function of temperature such as T/T0. The first H factor is cancelled, thereby generating a correction signal having the form Y ... | 11/10/2009 |
| 7557636 | Geometric ladder circuit with linear-in-dB transfer function A geometric ladder circuit produces a transfer function having substantially uniform steps measured in dB. Where the ladder has a plurality of substantially identical resistor rungs of a first resistance, one stile that is a conductor connecting the rungs, and anoth... | 07/07/2009 |
| 7453309 | Logarithmic temperature compensation for detectors The intercept of a logarithmic amplifier is temperature stabilized by generating a signal having the form H log H where H is a function of temperature such as T/T0. The first H factor is cancelled, thereby generating a correction signal having the form Y ... | 11/18/2008 |
| 7375576 | Log circuit and highly linear differential-amplifier circuit A log circuit receives an operated current signal and a reference current signal at respective inputs and comprises an operand log circuit including a first bipolar semiconductor device and being configured to generate a first logarithmized signal on the basis of th... | 05/20/2008 |
| 7368773 | Photodetector device, solid-state imaging device, and camera system A photodetector device is provided which comprises a photodiode for generating an electrical signal corresponding to an amount of incident light, and a logarithmic conversion transistor for subjecting a voltage value of the electrical signal to logarithmic conversio... | 05/06/2008 |
| 7355456 | Wide linear range peak detector A wide linear range peak detector including first and second peak detectors and a compensation circuit. The first peak detector receives an input signal and has an output providing a first peak signal approximation which approximates a peak level of the input signal... | 04/08/2008 |
| 7348846 | Amplifier arrangement The present invention relates to an amplifier arrangement having a plurality of amplifier stages that form a series circuit. Each amplifier stage comprises a current mirror, the translation ratio of which defines the gain of the amplifier stage. Moreover, a current ... | 03/25/2008 |
| 7340227 | Wireless communication system and semiconductor integrated circuit A wireless communication system uses a transmission power detection circuit. The transmission power detection circuit has excellent linearity of detection output for transmission output power and can obtain detection output not having temperature dependence. The tra... | 03/04/2008 |
| 7330064 | Geometric ladder circuit with linear-in-dB transfer function A geometric ladder circuit produces a transfer function having substantially uniform steps measured in dB. Where the ladder has a plurality of substantially identical resistor rungs of a first resistance, one stile that is a conductor connecting the rungs, and anoth... | 02/12/2008 |
| 7310656 | Grounded emitter logarithmic circuit A logarithmically-responding circuit includes a differential-input amplifier that drives the control terminal of a three-terminal device that exhibits an exponential response in its output current. This arrangement allows the third terminal to be grounded. In a pref... | 12/18/2007 |
| 7279953 | Current switch and method of driving the same A method and apparatus for driving a current switch with a differential drive signal monitors both the temperature of the switch and the current through the switch. The method and apparatus dynamically control the amplitude of the drive signal as a function of the s... | 10/09/2007 |
| 7268609 | Logarithmic detector or logarithmic amplifier having chopper stabilized logarithmic intercept One embodiment of the present invention is directed to an apparatus for reducing errors affecting the intercept of a logarithmic device, the apparatus including a first switching device coupled to an input of the logarithmic device. The first switching device for sw... | 09/11/2007 |
| 7262661 | Variable gain amplifier with temperature compensation and gain linearity enhancement A variable gain amplifier contains a plurality of differential transistor pairs. A temperature dependent current is generated in the current path of each differential transistor pair. A generated gain control current is converted to a temperature dependent gain cont... | 08/28/2007 |
| 7250747 | Radiometer measurement linearization system and method A radiometer system includes a dual channel, quadrature hybrid amplifier circuit that receives an antenna signal and a known reference signal to equalize gain in two parallel gain stages. A detector circuit receives a signal from the quadrature hybrid amplifier circ... | 07/31/2007 |
| 7246022 | Initiation of differential link retraining upon temperature excursion A method includes detecting a change in temperature in an integrated circuit that is coupled to a differential communication link, and responding to the detected change in temperature by initiating a retraining process for the differential communication link. ... | 07/17/2007 |
| 7242237 | Supply switch circuit for implementing a switchable on-chip high voltage supply A supply switch circuit is provided for implementing a switchable on-chip high voltage supply. A stack of transistors is coupled between an on-chip high voltage supply and a circuit node. A control signal is coupled to the stack of transistors for selectively switch... | 07/10/2007 |
| 7236111 | Linearizing methods and structures for amplifiers Methods and structures are provided to enhance the linearity of amplifiers such as those which include a complementary common-collector amplifier stage. The methods and structures configure this stage so that each transistor of the stage drives an output port throug... | 06/26/2007 |
| 7233174 | Dual polarity, high input voltage swing comparator using MOS input transistors A differential input comparator circuit comprises an input stage comprising dual polarity input voltages and an output stage adapted to output a differential voltage based on the input voltages, wherein the differential voltage is adapted to be transmitted to a comp... | 06/19/2007 |
| 7224226 | Amplifying device An amplifying device comprising a first terminal to which an alternating signal is inputted; a second terminal connected via an external first resistor to a power supply line; a third terminal to be grounded; a second resistor provided on a signal line in between th... | 05/29/2007 |
| 7205880 | Trimmer impedance component, semiconductor device and trimming method A trimmer resistance component of the present invention has a trimmer resistor constructed of a p-type diffusion layer formed on the surface of an n-type epitaxial layer. A first electrode is connected to a portion located on one end side of this trimmer resistor, w... | 04/17/2007 |
| 7196569 | Feedback compensation for logarithmic amplifiers A logarithmic amplifier is compensated by a feedback loop. The feedback loop may control a series of detector cells in response to an output from one or more of the detector cells. The feedback loop may be used to provide frequency compensation to the log amp by adj... | 03/27/2007 |
| 7193410 | Transistor monitor for a multiphase circuit A monitor system and method are described for sensing voltage changes in a plurality of transistors of a multiphase circuit comprising a sensor connected to each one of the plurality of transistors for measuring a voltage drop across the each one, a difference detec... | 03/20/2007 |
| 7180359 | Logarithmic temperature compensation for detectors The intercept of a logarithmic amplifier is temperature stabilized by generating a signal having the form H log H where H is a function of temperature such as T/T0. The first H factor is cancelled, thereby generating a correction signal having the form Y ... | 02/20/2007 |
| 7176755 | Transistor-based interface circuitry Among the embodiments of the present invention is an apparatus that includes a transistor, a servo device, and a current source. The servo device is operable to provide a common base mode of operation of the transistor by maintaining an approximately constant voltag... | 02/13/2007 |
| 7164443 | Image-sensing apparatus To reduce variations in output current of individual pixels resulting from variations in threshold voltage of the MOS transistor T1 provided in each pixel, the threshold voltage of the MOS transistor T1 of each pixel is measured to acquire compensation... | 01/16/2007 |
| 7154308 | Driver circuit with gradual voltage ramp up and ramp down A driver circuit is disclosed comprising an amplifier, a data DAC, and a voltage control mechanism (VCM). During a power up sequence, the VCM provides gradually increasing voltage signals to the amplifier to cause a voltage at the output of the amplifier to increase... | 12/26/2006 |
| 7149487 | Mobile communication terminal device and variable gain circuit In receiver systems for cellular phones using the W-CDMA method, the change in DC voltage occurring when the gain of a programmable gain amplifier (PGA circuit) is switched to adjust the gain for a received signal, can be suppressed. A sample-and-hold circuit is ins... | 12/12/2006 |
| 7126509 | Micropower logarithmic analog to digital conversion system and method with offset and temperature compensation A logarithmic analog-to-digital converter system is disclosed. The system includes a transconductor for receiving an input signal and for producing a transconductor output signal at a transconductor output, a logarithmic circuit unit that is coupled to an input of t... | 10/24/2006 |
| 7117128 | Method and apparatus for digital signal filtering A Q-Filter is a reconfigurable technique that performs a continuum of linear and nonlinear filtering operations. It is modeled by unique mathematical structure, utilizing a function called the Q-Measure, defined using a set of adjustable kernel parameters to enable ... | 10/03/2006 |
| 7088274 | Difference amplifier for digital-to-analog converter An improved circuit is provided that buffers the output of a DAC while improving the bandwidth and linearity of the circuit. A DAC comprises an output signal of a switched DAC circuit coupled to an inverting node of an output buffer configured as a difference amplif... | 08/08/2006 |
| 7078668 | Photoelectric conversion apparatus A photoelectric conversion apparatus includes a photoelectric conversion element and a logarithmic conversion unit for converting a signal from the photoelectric conversion element to a logarithmically compressed voltage by means of a diode characteristic of p-n jun... | 07/18/2006 |
| 7010283 | Signal waveform detection circuit A signal waveform detection circuit includes an amplifier circuit and a comparing circuit. The amplifier circuit has differential amplifiers connected in series. Each of the differential amplifiers has a common connection point. The comparing circuit is connected to... | 03/07/2006 |
| 7002395 | Demodulating logarithmic amplifier A demodulating logarithmic amplifier rectifies a radio frequency signal prior to amplification through progressive stages. A full wave linear or squaring rectifier receives a waveform signal at the input and provides a rectified signal that is proportional to an env... | 02/21/2006 |
