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| Number | Title | Issue Date |
| 8115575 | Active inductor for ASIC application An apparatus and method for manufacturing low-cost high-density compact active inductor module using existing DRAM, SRAM and logic process integration. The elements of the active inductor modules are formed by three semiconductor devices including nMOS devices, deep... | 02/14/2012 |
| 7880568 | Equalizer system having a tunable active inductor An linear equalizer system for a transmission channel includes an active inductor with a tunable inductance and quality factor. The active inductor includes a transconducting element. A current steering digital to analog converter controls the flow of a bias current... | 02/01/2011 |
| 7656255 | Methods and apparatus for programmable active inductance Methods and apparatus are provided for programmable active inductance. The disclosed active inductor devices provide a tunable bandwidth with improved linearity. The disclosed active inductors have a variable frequency response corresponding to a variable inductance... | 02/02/2010 |
| 7277684 | Antenna amplifier and shared antenna amplifier An object of the invention is to receive a weak signal with high sensitivity and reduce distortion and signal suppression when a strong interference signal exists. When a high-frequency signal received by an antenna is to be amplified by an antenna amplifier and whe... | 10/02/2007 |
| 7268634 | Dual-mode voltage controlled oscillator using integrated variable inductors A novel form of an integrated variable inductor uses an on-chip transformer together with a variable capacitor. The variable capacitor can either be a varactor or a switched capacitor array and is connected to the secondary coil of the transformer. By changing the c... | 09/11/2007 |
| 7259639 | Inductor topologies and decoupling structures for filters used in broadband applications, and design methodology thereof Inductor topologies for filters used in broadband applications are described. In one implementation, an apparatus, such as an interface module includes a printed circuit board and a filter. The filter includes a generally circular high Quality factor (Q) value spira... | 08/21/2007 |
| 7253707 | Tunable active inductor An active inductor capable of tuning a self-resonant frequency, an inductance, a Q factor, and a peak Q frequency by applying a tunable feedback resistor to a cascode-grounded active inductor is disclosed. The tunable active inductor includes a first transistor havi... | 08/07/2007 |
| 7239524 | Resistive element apparatus and method A resistive element, a circuit board, and a circuit package, as well as a method of adding a resistive element to a circuit board are described. The resistive element includes a first contact point connected to a capacitor terminal, a second contact point connected ... | 07/03/2007 |
| 7221132 | Power supply circuit A power supply circuit relating to the present invention comprises a differential amplifier for feeding out a voltage as a control voltage in accordance with a difference between a feedback voltage commensurate with an output voltage and a reference voltage, an outp... | 05/22/2007 |
| 7215227 | Gm-C filter compensation Compensation of effects derived from bandwidth limitations of an active frequency-selective circuit is effected by appropriately coupling a resistance to the frequency-selective circuit. In one embodiment, the resistance is designed to have a value that is inversely... | 05/08/2007 |
| 7203474 | Receiver system A conventional receiver system has a filter circuit with unsatisfactory gain characteristics, and thus does not offer satisfactory reception performance. A receiver system of the invention has a filter circuit employing an equivalent inductor circuit including a cap... | 04/10/2007 |
| 7199685 | Three-terminal, tunable active inductor The present invention provides an active inductor apparatus and system, having a variable frequency response through inductance adjustment. The active inductor apparatus comprises a variable resistive element and a variable gain element, and the system further compr... | 04/03/2007 |
| 7196574 | Active polyphase ladder filters with transmission zeros and their synthesis method Direct incorporation of transmission zeros into a continuous-time active complex BP filter transfer function yields a filter having much sharper roll-off than that of an all-pole filter. The ladder filter is constructed using transconductors and capacitors only. The... | 03/27/2007 |
| 7151407 | Switched-mode power amplifier using lumped element impedance inverter for parallel combining A switched-mode Class F power amplifier is provided for parallel connection with at least one other like amplifier, within a Chireix architecture, for combining the signals output therefrom. An input component includes at least one active device configured to be alt... | 12/19/2006 |
| 7135943 | Diplexer formed in multi-layered substrate A lumped-element diplexer formed in a multi-layered substrate includes a high-pass filter circuit, a low-pass filter circuit, and a ground plane, the elements of the filter circuits being disposed as follows: a first capacitor plate on a first layer of the substrate... | 11/14/2006 |
| 7126443 | Increasing performance of planar inductors used in broadband applications Increasing performance of planar inductors used in broadband applications is described. In one implementation, an apparatus includes a high Quality factor (Q) value spiral planar inductor etched directly into a printed circuit board. A ferrite structure is attached ... | 10/24/2006 |
| 7068130 | Active inductor An active inductor circuit (L) includes first (T1) and second (T2) terminals for coupling to respective external terminals (Hi,Lo), said first and second terminals being coupled to a first transconductance circuit (gm1), a second transconductanc... | 06/27/2006 |
| 7057313 | Cooling of voice coil motors A voice coil motor used, for example, in a positioning device associated with either a first object table or a second object table in which the coil is cooled with a cooling jacket in thermal contact with the coil, the cooling jacket comprising at least one channel ... | 06/06/2006 |
| 7049907 | System and method for adjusting group delay A group delay adjusting circuit. The group delay adjusting circuit comprises an electronically adjustable variable capacitance, and an electronically variable virtual inductor coupled in parallel to the electronically variable capacitance at a node. ... | 05/23/2006 |
| 7049888 | Active inductance circuit and differential amplifier circuit An active inductance circuit comprising a signal terminal (OUT) and having voltage and current characteristics, as viewed from this terminal, which are identical to those of a circuit comprising an inductance, this active inductance circuit having a structure in whi... | 05/23/2006 |
| 7042317 | High-frequency active inductor An active inductor circuit implemented in sub-micron CMOS semiconductor technology is usable at gigaHertz frequencies and includes an input node, a non-inverting transconductor circuit comprising a differential pair of NMOS transistors connected to the input node, a... | 05/09/2006 |
| 7020450 | Active inductors using bipolar silicon transistors An active inductor includes bipolar transistors T1, T2, T3 and TD (TD being arranged in diode), where T1's emitter is connected to an output port and to T2's collector. T2's base is connected to a first voltage line and betw... | 03/28/2006 |
| 7012487 | Transconductance device employing native MOS transistors A system on chip such as a radio receiver has reduced suceptibility to voltages in the bulk silicon by using gyrator elements in the receiver with each gyrator element including a plurality of current sources interconnected to provide output transconductance voltage... | 03/14/2006 |
| 6958668 | Active inductor An active inductor with a smaller voltage drop with respect to the power supply voltage of an integrated circuit can be realized by an active inductor which is biased from a voltage higher than the power supply voltage, the higher voltage being generatable on the in... | 10/25/2005 |
| 6954123 | Tuning circuit Selectivity Q of a tuning circuit is maximized by using a negative resistance circuit that is not influenced significantly by changes in conditions such as temperature, source voltage, etc. The tuning circuit operates stably and is constituted by a series resonance ... | 10/11/2005 |
| 6943619 | Practical active capacitor filter A method and apparatus is described that filters an electrical signal. The filtering uses a capacitor multiplier circuit where the capacitor multiplier circuit uses at least one amplifier circuit and at least one capacitor. A filtered electrical signal results from ... | 09/13/2005 |
| 6856215 | System and method for adjusting group delay A group delay adjusting circuit. The group delay adjusting circuit comprises an electronically adjustable variable capacitance, and an electronically variable virtual inductor coupled in parallel to the electronically variable capacitance at a node. ... | 02/15/2005 |
| 6838957 | Differential metal oxide semiconductor capacitor According to an embodiment of the present invention, a capacitor comprising field effect transistors and a bias transistor. ... | 01/04/2005 |
| 6836199 | Tuning circuit In order to improve Q of a tuning circuit by using a negative resistance circuit, a tuning circuit wherein a frequency selectivity characteristic and a tuning circuit gain does not vary and are kept constant values even if a tuning frequency is changed, is provided.... | 12/28/2004 |
| 6809616 | Inductor equivalent circuit and application thereof An inductor equivalent circuit is disclosed. The circuit comprises a reference current source, a first current mirror, a second current mirror, two operational amplifiers OP1 and OP2, a capacitor, a first transistor, a second transistor, a mirror resis... | 10/26/2004 |
| 6737944 | Active inductor A transistor M1 has its drain connected to a source of a transistor M2 through a capacitor Cc3. A series connection of a resistor R and a capacitor Cc1 is provided between a source of the transistor M1 and a gate of the tra... | 05/18/2004 |
| 6734767 | Diplexer The invention refers to a diplexer, particularly for use in microwave devices, comprising a low-pass filter and a high-pass filter, both having inductors and capacitors. It is suggested that at least one inductor of each of said filters is provided as an active indu... | 05/11/2004 |
| 6707354 | Active circuit for synthesizing an inductor A circuit for an apparatus is an active circuit that synthesizes self-induction. The active circuit comprises only one operational amplifier. With the use of tunable capacitors, the inductor synthesized by the active circuit becomes a tunable inductor. ... | 03/16/2004 |
| 6628181 | Tuning circuit having a resonance circuit and a negative resistance circuit A tuning circuit is constructed to set Q of the tuning circuit to a high desired value by using a negative resistance value. The tuning circuit is made to oscillate weakly by using a negative resistance circuit, a voltage-resistance converter and a digital-ana... | 09/30/2003 |
| 6552634 | Wideband, minimum-rating filters and multicouplers for power amplifiers A method and a circuit for power amplification over a wide frequency range based upon the use of minimum-rating filters or matching networks, negative-component signal processing, and single or multiple amplifiers. The filters and matching networks are pr... | 04/22/2003 |
| 6515560 | Active inductor An active inductor includes an MOSFET having a gate, a drain serving as an output terminal and a grounded source, the MOSFET having a transconductance gm1, and a capacitor having opposite ends, one of which is grounded and the other of which is connected ... | 02/04/2003 |
| 6437649 | Microwave amplifier A resistor is inserted in series with an inductor feeding a bias current and that reactance of an input matching circuit or of an output matching circuit is varied depending on variations of input signal power. The input impedance of the amplifying elemen... | 08/20/2002 |
| 6340916 | Ransimpedance amplifier circuit An innovated transimpedance amplifier circuit consists of a buffer circuit, a simulation resistance circuit, and an amplifier circuit. The buffer circuit for inputting a signal circuit is constituted by two FETs and a resistor, and has a high current inpu... | 01/22/2002 |
| 6300824 | Analog offset cancellation method and circuit and amplifier using such circuit An analog offset cancellation technique is based on the observation that the voltage developed across an inductor is proportional to the time derivative of the current passing through the inductor. An input voltage that may contain an undesired DC offset ... | 10/09/2001 |
| 6292064 | Voltage controlled oscillator and semiconductor IC device including a voltage controlled capacitor A voltage controlled oscillator (VCO) having an amplifier including a field-effect transistor (FET). The VCO includes a voltage controlled capacitor having an inversion amplifier including an FET, an amp gain of the inversion amplifier being controlled by... | 09/18/2001 |
