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| Number | Title | Issue Date |
| 8154332 | Current-controlled resistor A current-controlled resistor comprises a first input terminal configured to receive an input signal and a second input terminal configured to receive a current control signal. The resistor comprises a first stage configured to receive the current control signal; th... | 04/10/2012 |
| 8149042 | Analog switch for signal swinging between positive and negative voltages An analog signal is input to an input terminal. An analog signal is output via an output terminal. A first transistor is an N-channel MOSFET, and is provided between the input terminal and the output terminal. A first resistor is provided between the gate of the fir... | 04/03/2012 |
| 7990201 | Constant phase digital attenuator with on-chip matching circuitry Various embodiments are directed to providing constant phase digital attenuation. In one embodiment, a digital attenuator circuit (100) comprises an input node (102) to receive an input signal to be attenuated, an output node (104) to output an ... | 08/02/2011 |
| 7898314 | Offset compensation using non-uniform calibration Methods and systems for offset compensation using calibration are provided. Embodiments enable offset compensation using non-uniform calibration. Embodiments enable calibration schemes configurable according to the probability distribution function (PDF) of the rand... | 03/01/2011 |
| 7868681 | Programmable gain circuit A programmable gain circuit suitable for a programmable gain amplifier is described. In one design, the programmable gain circuit includes multiple attenuation circuits coupled in series. Each attenuation circuit operates in a first mode or a second mode, attenuates... | 01/11/2011 |
| RE41728 | High linearity, low power voltage controlled resistor A number of voltage-controlled resistance cells, each formed by a transistor with a biasing capacitor connected between the gate and source and an associated controller coupled to the capacitor to maintain a steady charge on the biasing capacitor and keep the gate-s... | 09/21/2010 |
| 7786787 | Series/shunt switch and method of control A switch includes at least two signal ports in series with a series FET connected therebetween, and a shunt path having an FET, whereby an input bias is applied to a gate on the series FET and to a drain on the shunt FET. In one embodiment, the switch includes a con... | 08/31/2010 |
| 7750716 | Variable resistor, filter, variable gain amplifier and integrated circuit using the variable resistor A variable resistor formed on a silicon substrate, and changing a resistance value between an input terminal and an output terminal, includes a plurality of first resistors each having one end connected in common to the input terminal, and each having other end, a p... | 07/06/2010 |
| 7710181 | Variable attenuator and wireless communication device A variable attenuator, used with high frequency, provides large variable attenuation per stage. The variable attenuator includes: a MOSFET having a gate, a drain, a source, and a body; an attenuation control circuit; and a temperature characteristics compensation ci... | 05/04/2010 |
| 7679417 | Attenuator with bias control circuit An attenuator includes one or more series attenuation branches including one or more series field effect transistors (FETs) each having a gate; one or more shunt attenuation branches including one or more shunt FETs each having a gate; and a bias control FET. The bi... | 03/16/2010 |
| 7675342 | On-chip electrically alterable resistor A programmable, electrically alterable (EA) resistor, an integrated circuit (IC) chip including the EA resistor and integrated analog circuits using on-chip EA resistors. Phase change storage media form resistors (EA resistors) on an IC that may be formed in an arra... | 03/09/2010 |
| 7663420 | MOS resistance controlling device and MOS attenuator A MOS resistance controlling device includes: a plurality of MOS transistors having a first MOS transistor to N-th (the integer N is larger than 1) MOS transistor being serially connected, the source of the first MOS transistor being set to a first reference potenti... | 02/16/2010 |
| 7659765 | Resistor circuit Operations as a variable resistor are favorably realized even when a drain-source voltage of a variable MOS resistor and that of a reference MOS resistor are not the same. A gate voltage of the variable MOS resistor is controlled with reference to a gate voltage whi... | 02/09/2010 |
| 7646231 | System and method for controlling attenuator An apparatus for setting an attenuation of an attenuator includes a control transistor, which includes a drain connected to a gate of a shunt transistor of the attenuator. A channel resistance of the shunt transistor corresponds to a current density of the control t... | 01/12/2010 |
| 7636004 | High-frequency switching device and semiconductor The first terminals of a plurality of resistor elements are connected to the intermediate connection points of a plurality of FETs connected in series, and a voltage, having a phase opposite to that of the voltage applied to the gate terminals of the plurality of FE... | 12/22/2009 |
| 7521980 | Process and temperature-independent voltage controlled attenuator and method A circuit includes a first variable resistor having a resistance which is variable in response to a resistance control signal. A resistance control circuit includes a first current source circuit for supplying a first current through a reference resistor. A second c... | 04/21/2009 |
| 7514979 | De-emphasis system and method for coupling digital signals through capacitively loaded lines A system for de-emphasizing digital signals, such as address signals, boosts the level of the signals for one clock period prior to transmitting the signals through signal lines that may have a relatively large capacitance. The system may include a delay circuit tha... | 04/07/2009 |
| 7477085 | Digital attenuator circuits and methods for use thereof An attenuator system includes a first adjustable impedance component on a first current path between a input component and a output component, and a second adjustable impedance component between the first current path and ground, wherein each of the first and second... | 01/13/2009 |
| 7453307 | Process independent voltage controlled logarithmic attenuator having a low distortion and method therefor A process independent voltage controlled logarithmic attenuator has an attenuator control stage block having a first input coupled to a controlled input and a second input coupled to an offset generator. An attenuator transistor is coupled to the attenuator controll... | 11/18/2008 |
| 7439789 | Systems and methods for controlling termination resistance values for a plurality of communication channels Described are controllable termination impedances that may be adjusted collectively by a combination of digital and analog signals. Each adjustable impedance, responsive to the digital signals, establishes a gross termination resistance for one of a plurality of com... | 10/21/2008 |
| 7408396 | High voltage protection circuit Disclosed is a circuit to provide protection from an over voltage signal. The circuit protects against load dumps or positive transients applied to any electronic unit. The circuit isolates the protected circuitry from the transient voltage by two ways. The circuit ... | 08/05/2008 |
| 7378895 | On-chip electrically alterable resistor A programmable, electrically alterable (EA) resistor, an integrated circuit (IC) chip including the EA resistor and integrated analog circuits using on-chip EA resistors. Phase change storage media form resistors (EA resistors) on an IC that may be formed in an arra... | 05/27/2008 |
| 7375573 | De-emphasis system and method for coupling digital signals through capacitively loaded lines A system for de-emphasizing digital signals, such as address signals, boosts the level of the signals for one clock period prior to transmitting the signals through signal lines that may have a relatively large capacitance. The system may include a delay circuit tha... | 05/20/2008 |
| 7372313 | Variable impedance circuit and apparatus comprising said variable impedance circuit A variable impedance circuit includes at least one fixed resistance and a plurality of transistors between a first and a second terminal. The transistors belonging to the plurality of transistors are arranged parallel to one another and parallel to the resistance an... | 05/13/2008 |
| 7372315 | Switching circuit using semiconductor switching element A switching circuit includes a semiconductor switching element having a control electrode and a source-drain current path, the source-drain current path being connected between a voltage source and a load circuit, a parallel circuit formed by first and second transi... | 05/13/2008 |
| 7365617 | Wideband attenuator circuits and methods Embodiments of the present invention include wideband attenuator circuits and methods. In one embodiment the present invention includes a first divider circuit coupled in series with two or more second divider circuits. The divider circuits include resistance and ca... | 04/29/2008 |
| 7359173 | System and method for protecting IC components One embodiment provides a system for protecting at least one component in an integrated circuit (IC). The system includes a disconnect element that is electrically connected in series between a terminal of the IC and the at least one component. The disconnect elemen... | 04/15/2008 |
| 7358879 | ΔΣ modulator system with start up transient suppression A ΔΣ modulator system with start up transient suppression includes a ΔΣ analog to digital converter having predetermined internal signal limits; an envelope control circuit for attenuating the input signal to the ΔΣ analog to digital converter and a control ci... | 04/15/2008 |
| 7358974 | Method and system for minimizing an amount of data needed to test data against subarea boundaries in spatially composited digital video A method and system for minimizing an amount of data needed to test data against subarea boundaries in spatially composited digital video. Spatial compositing uses a graphics unit or pipeline to render a portion (subarea) of each overall frame of digital video image... | 04/15/2008 |
| 7352259 | Broadband step attenuator with improved time domain performance An integrated step attenuator (“ISA”) monolithically integrated on a single chip for adjusting an input signal. The ISA may include a step attenuation network (“SAN”) that may include at least one switchable attenuation section, and at least one electronical... | 04/01/2008 |
| 7352226 | Versatile attenuator A versatile attenuator. The versatile attenuator includes a first mechanism for receiving an input signal. A second mechanism measures the input signal and provides a signal-level indication in response thereto. A third mechanism selectively attenuates the input sig... | 04/01/2008 |
| 7345521 | High frequency switch circuit A high-frequency switch circuit has a plurality of high-frequency switches for passing and blocking a high-frequency signal between an input terminal and an output terminal depending on a control potential applied as a control signal, a high-frequency detecting term... | 03/18/2008 |
| 7345556 | Variable attenuation circuit having large attenuation amount with small circuit size A variable attenuation circuit includes an attenuation circuit which has a first semiconductor variable impedance element, and an attenuation control circuit of which the impedance is changed by a control voltage to be applied from the outside and which has a second... | 03/18/2008 |
| 7343256 | Configurable voltage regulator A configurable semiconductor has a device characteristic that is controllable as a function of at least one external impedance. A measurement circuit measures an electrical characteristic of the at least one external impedance and determines a select value correspon... | 03/11/2008 |
| 7337547 | High frequency switching circuit device A diode logic circuit which can select a high voltage from among the voltages of a number of control voltage input terminals using a number of diodes made of Schottky junctions is integrally formed on a compound semiconductor substrate on which MESFET stages for swi... | 03/04/2008 |
| 7339398 | Driver impedance control apparatus and system A driver impedance control apparatus and system for determining the impedance of at least one driver are provided. The driver impedance control apparatus includes a first reference impedance, a second reference impedance, a dummy pull-up array, a dummy pull-down arr... | 03/04/2008 |
| 7332904 | On-chip resistor calibration apparatus and method An on-chip resistor is calibrated with a sense circuit that compares a resistance associated with an off-chip resistor to the on-chip resistor via a current-mirror circuit and a comparator. A digital counter circuit evaluates the comparison and adjusts its count suc... | 02/19/2008 |
| 7323922 | Digitally controlled gain stage having an analogue control input A signal processing system has a first, digitally controlled, gain element, a second, analogue controlled, gain element and a gain control unit configured to receive a gain request signal and to generate a first gain control signal to be input to the first gain elem... | 01/29/2008 |
| 7323933 | Vector modulator having attenuators with continuous input steering Variable attenuation systems having continuous input steering may be used to implement vector or quadrature modulators and vector multipliers. Discrete implementations of attenuators with continuous input steering may have two outputs which may be cross-connected to... | 01/29/2008 |
| 7324250 | Image forming apparatus Disclosed is an image forming apparatus capable of keeping an oscillation angle of an oscillating mirror at a constant value based on control of a drive frequency. In this image forming apparatus, a semiconductor laser emits a light beam, and an oscillating mirror r... | 01/29/2008 |
