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| Number | Title | Issue Date |
| 7852174 | Negative capacity circuit for high frequencies applications A negative capacitances circuit includes first and second branches connected between a first reference voltage and a second reference voltage. The first branch includes, in series, a first biasing resistor, a first diode, a first bipolar transistor, and a first curr... | 12/14/2010 |
| 7583166 | Inductor Q factor enhancement apparatus has bias circuit that is coupled to negative resistance generator for providing bias signal The present invention provides an apparatus for enhancing Q factor of an inductor. The apparatus includes a negative resistance generator coupled to the inductor for providing a negative resistance, and a bias circuit coupled to the negative resistance generator for... | 09/01/2009 |
| 7319731 | High precision continuous time gC BPF tuning High precision continuous time gmC BPF (Band Pass Filter) tuning. A novel approach is presented by which a continuous time signal serves as a BPF control voltage for tuning of a BPF within a communication device (e.g., transceiver or receiver). A PLL (Pha... | 01/15/2008 |
| 7230503 | Imbalanced differential circuit control A differential circuit includes first and second side circuits which are coupled to receive control signals in such a way as to introduce an intentional imbalance in the differential circuit for certain benefits discussed herein. An exemplary pseudo-differential LC ... | 06/12/2007 |
| 7202762 | Q enhancement circuit and method A Q enhancement circuit and method. In a most general embodiment, the inventive circuit is adapted for use with a component having a parasitic resistance R3 and a first resistance R1 disposed in series with the component and an arrangement for ... | 04/10/2007 |
| 7113117 | Reducing the effect of noise present along with an input signal when sampling the input signal An aspect of the present invention reduces the effect of any noise present along with an input signal when sampling the input signal by charging each of several parallel connected capacitors for different time durations with at least some non-overlap. In an embodime... | 09/26/2006 |
| 7088985 | Low-noise filter for a wireless receiver A low-noise filter for a wireless receiver is disclosed. The low-noise filter comprises an amplifier and a filter comprising a frequency dependent negative resistance implemented using a general impedance converter to realize a bi-quad filter. The low-noise filter i... | 08/08/2006 |
| 7053697 | System for tuning a corner frequency of a low pass filter An integrated circuit formed on a semiconductor chip, comprising a low pass filter circuit having a first resistor of a first resistance value and a capacitor of a first capacitance value, wherein the first resistance value and the first capacitance value determine ... | 05/30/2006 |
| 7005950 | Negative impedance converter There is provided a negative impedance converter, which has negative impedance conversion function by widening the available range of a generalized impedance converter. A generalized impedance converter is composed of two operational amplifiers Q1 and Q | 02/28/2006 |
| 6985053 | Negative resistance circuit In order to provide a negative resistance circuit which is not influenced by means of change of temperature and source voltage, etc., operates stably and has simple circuit construction, a first stage circuit of the negative resistance circuit is a collector-emitter... | 01/10/2006 |
| 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 |
| 6944435 | Unconditionally stable on-chip filter and applications thereof An unconditionally stable on-chip filter includes a filtering section and at least one negative resistance module. The filtering section is operably coupled to filter a signal and includes realizable integrated circuit passive components. The at least one negative r... | 09/13/2005 |
| 6937195 | Inverted-F ferroelectric antenna An inverted-F ferroelectric antenna is provided. The antenna comprises a counterpoise, or groundplane, and a radiator structure having a first end and a second end. A capacitor, formed from a ferroelectric dielectric is interposed between the second end of the radia... | 08/30/2005 |
| 6915146 | Method and apparatus for receiving a plurality of different codes at a plurality of different frequencies A receiver capable of receiving a plurality of different codes at a plurality of different frequencies is set forth herein. The receiver offers digital frequency control by using a controller driven signal diode to add or remove capacitance to or from a band pass fi... | 07/05/2005 |
| 6870447 | Tuning circuit A tuning circuit using a negative resistance circuit for compensating an equivalent series resistance component thereof is provided. The negative resistance circuit has simple circuit construction and design and adjustment thereof is easy. The tuning circuit compris... | 03/22/2005 |
| 6768393 | Circuit and method for calibrating resistors for active termination resistance, and memory chip having the circuit A circuit and method for calibrating an active termination resistor irrespective of changes in process, voltage, or temperature is provided. The method includes the steps of (a) calibrating a first variable resistor to have the same resistance as that of an external... | 07/27/2004 |
| 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 |
| 6577212 | Integrated circuit The invention relates to an integrated gyrator structure, in which each transistor in the gyrator core (preferably MOS devices) has series feedback associated therewith. This allows for compensation over a large bandwidth of the effects of channel delay i... | 06/10/2003 |
| 6573788 | Amplifier device with frequency-response-compensating amplifier reactance, and use of the amplifier device The amplifier device serves the purpose of broadband amplification of an electric input signal fed from a signal source. It has an amplifier input for feeding the input signal, and a broadband amplifier element. Provided for the purpose of compensating a ... | 06/03/2003 |
| 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 |
| 6545570 | Tuning circuit including a negative impedance circuit A tuning circuit has a simple circuit construction and is capable of setting Q thereof to a high desired value. The tuning circuit is formed by a resonance circuit consisting of an inductor and a capacitor and a negative resistance circuit connected in se... | 04/08/2003 |
| 6504458 | Tuning circuit with controlled negative resistance In order to automatically set a Q value to an optimal value, a tuning circuit has a resonance circuit composed of an inductor and a capacitor. The resonance circuit includes a negative resistance circuit having a dummy load resistance and a negative imped... | 01/07/2003 |
| 6417734 | High-frequency amplifier circuit with negative impedance cancellation A high-frequency amplifier circuit includes an amplifying transistor and a driver transistor, with the amplifying transistor being connected in either a common emitter or a common source configuration and the driver transistor being connected in a corresp... | 07/09/2002 |
| 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 |
| 6078215 | Impedance altering apparatus A circuit for modifying the impedance of a subject circuit includes a driving impedance element having an impedance characteristic which is substantially proportional to the impedance characteristics of the subject circuit. The circuit of the present circ... | 06/20/2000 |
| 5617064 | Active resistor for stability compensation An active termination resistor is provided within a feedback loop circuit thus advantageously increasing the stability of the feedback loop circuit. In particular, the active termination resistor traces the impedance of the feedback loop such that R(f).co... | 04/01/1997 |
| 5550520 | Monolithic HBT active tuneable band-pass filter An active tuneable band-pass filter is provided which has a negative resistance circuit for generating a tuneable amount of negative resistance for a passive band-pass filter structure so as to compensate for resistive losses. The negative resistance circ... | 08/27/1996 |
| 5451915 | Active filter resonator and system and negative resistance generator usable therein A negative resistance generator includes first and second terminals; first and second inductors connected in series between the terminals; and a semiconductor amplifying device having a first control electrode connected to the first terminal and a first a... | 09/19/1995 |
| 5371801 | Energy absorption apparatus Apparatus for absorbing acoustic energy directed toward a wall. The appars includes a piezoelectric layer intermediate the wall and the source of the acoustic energy. Circuitry attached to the output of the transducer compensates blocked and motional cap... | 12/06/1994 |
| 5343177 | Simulated coupled inductors using generalized impedance converters Apparatus and methods are disclosed for use in electronic circuits that contain Generalized Impedance Converters and shape frequency response. The combined effect of two Generalized Impedance Converters 30 and 34 with their outputs connected to a coupler ... | 08/30/1994 |
| 5343170 | Voltage controlled oscillator provided with negative feedback biasing A voltage controlled oscillator (VCO) including a negative feedback circuit operates in response to a negative feedback signal generated during active transistor region operation of transistors in transconductance amplifying stages coupled thereto. As a r... | 08/30/1994 |
| 5315399 | Capacitive circuit A capacitive circuit incorporated in an integrated circuit, the capacitive circuit including a high-pass type non-inverting amplifier which receives an input signal and a differential amplifier which receives the input signal and an output signal of the n... | 05/24/1994 |
| 5249224 | Methods and apparatus for providing reciprocal impedance conversion A reciprocal impedance conversion network is disclosed. Such conversion network preferably is used in a reciprocal negative impedance repeater for the nonloaded cable facilities of a telephone system. Two independent voltage sources for generating recipro... | 09/28/1993 |
| 5172076 | Resonant circuit formed of two amplifiers connected in a loop and multiple resonator circuits constructed therefrom A resonant circuit comprises first and second amplifiers. An input of the second amplifier is coupled to an output of the first amplifier, and an output of the second amplifier is cross-coupled to an input of the first amplifier. The first amplifier has a... | 12/15/1992 |
| 5066140 | Temperature measurement Temperature measurement with thermocouples is made more accurate, and the cost of disposable thermocouples is reduced by locating the cold junction close to the hot junction, utilizing a thermistor in thermal communication with the cold junction in develo... | 11/19/1991 |
| 4990872 | Variable reactance circuit producing negative to positive varying reactance A reactance circuit comprises a differential amplification circuit formed by differentially connecting the first and second transistors to each other, a load connected to a collector of the first transistor, a reactance element interposed between a base o... | 02/05/1991 |
| 4740716 | Monolithic high Q varactor circuit An active element behaving as a negative resistor is situated in parallel with a varactor to cancel the varactor losses. DC bias is provided for the active element and for the varactor which are separated by a DC block. The entire circuit can be fabricate... | 04/26/1988 |
| 4706281 | Dynamic impedance element for a battery feed circuit Battery feed circuits function to supply a predetermined current to the communication pair and include circuitry to counteract the effects of balanced longitudinal signals which appear on the communication pair. Prior art battery feed circuits use either ... | 11/10/1987 |
| 4686486 | Active filter having series resonant active filter terminated by parallel resonant active filter A fourth (or higher) order filter has a series resonant section terminated by a parallel resonant section, both based on frequency dependent negative resistance (FDNR). The FDNR, resistance and capacitance (representing damping) of the series section are ... | 08/11/1987 |
| 4587500 | Variable reactance circuit producing negative to positive varying reactance A variable reactance circuit which can produce equivalent reactance varying from negative given values to positive given values in accordance with fundamental reactance elements such as capacitor, coil, etc. The present invention has a big advantage of be... | 05/06/1986 |
