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9024710 
Lowvoltage active inductor
An active inductor circuit includes a fieldeffect transistor having a first source/drain adapted for connection with a first voltage source, a capacitor coupled between the first voltage source... 

8878631 
Active low pass filter
The invention relates to a selective active lowpass filter and to a method for improving the selectivity of such a filter. The method includes centering, in the center of a network, the resonant... 

8766746 
Active inductor
In one embodiment, a circuit, which comprises a resistor and a pMOS or cMOS transistor, has the characteristic of an inductor and produces an inductive impedance that operates over a substantially... 

8723625 
Amplification cell employing linearization method and active inductor using the same
An amplification cell employing a linearization scheme and an active inductor using the same are provided. The active inductor includes: first and second amplification cells each including a main... 

8653900 
Oscillator
There is provided an oscillator using a highfrequency crystal resonator which can satisfy the drive level needed for the crystal resonator and expand a variable frequency range. An oscillator... 

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... 

7843287 
Active resonant circuit with resonantfrequency tunability
The present invention is directed to provide a lowpowerconsumption widerange RF signal processing unit having a small chip occupation area. A semiconductor integrated circuit has, on a... 

7683742 
Integrated electronic circuitry comprising tunable resonator
An electronic circuit includes: an acoustic resonator of BAW or SAW type, said resonator having a series resonance frequency and a parallel resonance frequency; an active circuit which is coupled... 

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... 

7541882 
Onchip tunable artificial tank circuit
Disclosed is a tuned circuit tuned to an input signal having a predetermined radio frequency, the tuned circuit comprising a tank circuit having a loaded ring oscillator circuit with a resonant... 

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... 

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... 

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... 

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... 

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... 

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... 

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... 

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... 

6573788 
Amplifier device with frequencyresponsecompensating 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... 

6552634 
Wideband, minimumrating filters and multicouplers for power amplifiers
A method and a circuit for power amplification over a wide frequency range based upon the use of minimumrating filters or matching networks, negativecomponent signal processing, and single or... 

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... 

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... 

6417734 
Highfrequency amplifier circuit with negative impedance cancellation
A highfrequency 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... 

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... 

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... 

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... 

5550520 
Monolithic HBT active tuneable bandpass filter
An active tuneable bandpass filter is provided which has a negative resistance circuit for generating a tuneable amount of negative resistance for a passive bandpass filter structure so as to... 

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... 

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... 

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... 

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... 

5315399 
Capacitive circuit
A capacitive circuit incorporated in an integrated circuit, the capacitive circuit including a highpass type noninverting amplifier which receives an input signal and a differential amplifier... 

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... 

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 crosscoupled to... 

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... 

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... 

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... 

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... 

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... 

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,... 

4551683 
Switched capacitor filter circuit
Disclosed is a switched capacitor filter circuit employing the equivalent resistance of a switched capacitor circuit as the resistive element in a frequency dependent impedance converting circuit. 

4521750 
Characteristic switching circuit
A time constant circuit capable of switching the characteristic, which is realized by a combination of an equivalent resistor made up of a switched capacitor and an ordinary capacitor, comprises a... 

4375625 
Switchedcapacitor source resistor simulation circuit
An integratable circuit that simulates a source resistor comprises first and second nodes for connection to a voltage source and a virtual ground, respectively; a first integrated capacitor C1;... 

4363008 
Electronic transformer
An electronic transformer is characterized by a pair of out of phase and bilateral current sources, the outputs from which are opposite in phase and control voltages across and currents through... 

4350964 
Impedance generator circuit
An improved impedance generator circuit, for use with twowire transmission systems of the type encountered in telephony, is adapted to be interfaced with the wires and operates in a manner to... 

4331944 
Switchedcapacitor resistor simulation circuits
An integratable switched capacitor simulation circuit comprising an integrated capacitor C3 having bottom and top plates thereof electrically connected to first and second nodes, and a pair of... 

4296392 
Switched capacitor bilinear resistors
A two terminal circuit comprising a capacitive element (with a negative capacitance of value C/2) connected between the terminals, and an integrated capacitor (with a positive capacitance C)... 

4257006 
Integrable analog active filter and method of same
Integrable analog active filter suitable for MOS monolithic implementation. The filter utilizes only integrating amplifiers and ratioed capacitors thus being implementable in MOS technology and... 

4242656 
Current pumped voltage divided absorbor
A twoterminal active network which simulates a low noisetemperature resistor is disclosed. In a preferred embodiment, a pair of operational amplifiers, each connected in the manner of a "current... 

4232280 
Network for simulating low temperature resistors
A class of twoterminal active networks which simulate lownoise temperature resistors is disclosed. A single field effect transistor or other suitable amplifier comprises the active element of... 