Matches 1 - 50 out of 69 1 2 >


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8063697 Self-oscillating driver circuit  
A self-oscillating driver circuit comprises a driver stage, a feedforward path which is coupled to an input of the driver stage, and a feedback path which couples an output of the driver stage to...
5705951 Method for correction of error signals in a signal amplification system and an apparatus used for that purpose  
In a method and by an apparatus for correction of error signals and for forming of an arbitrary transfer function being independent of the quality of a payload (loudspeaker; H1) included in a...
5371472 Charge amplifier for sensors outputting electrical charge  
A charge amplifier for sensors outputting electrical charge, particularly for piezoceramic pressure sensors, includes a voltage integrator having an output, an integration capacitor and a resistor...
5081410 Band-gap reference  
A band-gap reference having a differential amplifier with first and second inputs and an output, and a voltage divider coupled to the differential amplifier output. A first transistor having a...
4791381 Integrated amplifier circuit  
An integrated amplifier circuit includes: first and second operational amplifiers each having a terminal connected to a supply potential node, and a terminal connected to a reference potential...
4716378 Amplifier circuit  
An amplifier circuit for use, e.g., in audio appliances, comprises two amplifiers; a first amplifier for controlling the output voltage, and a second amplifier for driving output electric current....
4633189 NF tone control circuit  
An NF (Negative Feedback) tone control circuit in which a circuit gain of unity is maintained for a flat frequency response without the addition of active components. A voltage divider circuit...
4543536 Charge amplifier with automatic zero  
A charge amplifier includes an operational amplifier having first and second voltage dividers across its output connected to a capacitor and a resistor, respectively, in an R-C network returned to...
4502020 Settling time reduction in wide-band direct-coupled transistor amplifiers  
A wide-band direct-coupled transistor amplifier exhibits greatly improved settling time characteristics as the result of circuitry permitting the use of current feedback rather than voltage...
4387345 Precision gain AC coupled operational amplifier  
A precision gain AC coupled operational amplifier circuit utilizing an integrated resistor voltage divider network and switched capacitors is provided. Precise gain is obtained by the use of...
4354163 High voltage buffer amplifier  
A buffer amplifier is disclosed which has the ability to retain a high voltage from input to output and is capable of coupling to highly capacitive loads. The input impedance can be tailored up to...
4340865 Electric amplifier circuits that respond to an input signal of either polarity to produce an output signal having a polarity corresponding to that of the input signal  
An electric amplifier adapted to respond to an input signal of either polarity comprising a first differential amplifier OP1 which is arranged to drive through a load L a current whose value...
4322681 Module for analyzing and linearizing of electrical signals from unknown systems and method for using it  
A device for analyzing and linearizing the frequency characteristics of electrical signals from unknown systems consists of identically constructed modules with variable transfer functions, which...
4268760 Amplitude-limiter  
An amplitude limiting circuit is provided in which the input signal is fed to the non-inverting input terminal and the output is taken from the inverting input terminal of an operational amplifier...
4193040 High-voltage amplifier with low output impedance  
The technical field to which this invention pertains is high-voltage amplifiers. The amplifier includes a high-voltage capacitor (C1) across which the output of the amplifier is developed. This...
4156853 Active filter for providing improved notch and band pass filters  
An active filter is disclosed for providing improved notch and band pass filters. The output to input frequency response of an active filter is mathematically expressed as a ratio of two...
4152659 Low noise differential amplifier  
A low noise differential amplifier circuit which requires only two operational amplifiers and which has lower noise than conventional differential amplifiers. An alternate embodiment is disclosed...
4151478 Nonlinearly variable gain apparatus  
A nonlinearly variable gain circuit is utilized to produce an inverted logarithmic S curve of gain versus potentiometer rotation while using a linear resistance taper potentiometer. An operational...
4107622 Tone controller  
A feedback resistor is interposed between a reversing input terminal of an audio amplifier and at least one impedance circuit. The impedance circuit is connected to an output terminal of the...
4107618 Amplifier system having signal gain independent of a reference voltage  
The amplifier system comprises a pair of operational amplifiers with an appropriate resistance network such that when a reference voltage and differential signal are applied to the system, changes...
4099134 Amplifier with controllable transmission factor and switchable control characteristic  
An amplifier whose transmission factor is to be controlled as a function of a control voltage and including an amplifier member having a negating input, connected to have its impedance varied by...
4092494 Loud-speaker enclosure with electrical feed-back  
The invention relates to loud-speaker enclosures comprising a sealed box with several loud-speakers. More particularly, the invention relates to a sealed box enclosure comprising an amplifier and...
4091333 Transconductance amplifier circuit  
A transconductance amplifier circuit including two operational amplifiers, as shown in the accompanying drawing, is disclosed. The gain of the amplifier circuit is determined by the resistances...
4087758 Reference voltage source circuit  
A reference voltage source circuit includes two transistors having their collectors connected to the input terminals of a differential amplifier. The transistor terminals are connected in common,...
4079331 Amplifier system with special feedback circuits  
A condition responsive element, disclosed as a negative temperature coefficient thermistor, operates in conjunction with a bridge circuit to provide a differential input to a special direct...
4078215 Electronic filter circuit  
An electronic filter circuit having controlled "Q" with variations in attenuation. A plurality of filter networks are connected in parallel between the output and the input of an amplifier in a...
4055813 Single adjustment multiple function calibration circuit  
A single adjustable control is commonly connected with each of a plurality of feedback channels, which are selectively coupled in an amplifier circuit to provide the latter with different basic...
4037170 Difference amplifier having extended common mode range  
A difference amplifier, the construction of which includes operational amplifier, has an extended amplitude range of common mode signal. The input of the circuit which is applied to the inversion...
3983504 Active filter  
An improved filtering circuit connected to the inverting terminal of an operational amplifier having connected in parallel a first resistor and three series capacitors. Two series resistors are...
3980942 Apparatus for the control of electrical heating of a semiconductor rod  
An arrangement for electrically heating a semiconductor rod which is simultaneously growing by means of materials deposited from a gas phase, wherein the heating current circuit is formed by a...
3972006 Bandpass filter  
An active filter for electronic circuits comprising a single frequency bandpass filter including two stages each comprising a differential input high performance operational amplifier with the...
3939433 Feedback circuit  
A feedback circuit for feeding back the output voltage of a comparing amplifier to the input circuit of the comparing amplifier for causing a steep change in the output voltage so as to stabilize...
3833860 AMPLIFIER SYSTEM HAVING PSEUDO SUMMING JUNCTION  
A summing amplifier system having a pseudo summing junction in a feedback network for biasing the output of the system by a DC voltage while simultaneously applying a second voltage to a...
3673512 SERVO AMPLIFIER  
A servo amplifier is provided with associated circuitry which affords substantially independent compensation of both its frequency response and gain over the usable bandwidth whereby in a servo...
3638133 FEEDBACK AMPLIFIER WITH BRIDGE-STABILIZED OUTPUT IMPEDANCE  
An impedance-matching arrangement comprising an operational amplifier with a bridge-stabilized output impedance transfers power between circuits having a common ground. The resulting stable gain...
3614633 INDUSTRIAL PROCESS REGULATOR OF PROPORTIONAL PLUS INTEGRAL PLUS DIFFERENTIAL ACTION  
A regulator for industrial process control, including an amplifier and a negative feedback circuit. The regulator is of a proportional, plus integral, plus differential action type which includes...
3611115 THREE-POINT REGULATOR COMPRISING OPERATIONAL AMPLIFIERS WITH COMMON INPUT  
A three-point regulator utilizing two zero threshold switches having symmetrical switching characteristics and having threshold voltages simultaneously, symmetrically adjustable by a single...
3602833 ACTIVE TWIN T FILTER WITH A POSITIVE FEEDBACK Q CONTROL  
An active twin T filter in which current is drawn from an amplifier or from the legs of a twin T network and passed as feedback to the positive input side of the amplifier to provide Q control and...
3512101 HIGH IMPEDANCE INPUT CIRCUIT FOR OPERATIONAL AMPLIFIER CIRCUITS  
3473142 ACTIVE PARALLEL-T FILTER HAVING SEPARATE FEEDBACK PATHS  
3465276 NEGATIVE FEEDBACK CIRCUIT EMPLOYING COMBINATION AMPLIFIER AND LEAD-LAG COMPENSATION NETWORK  
3451006 VARIABLE GAIN AMPLIFIERS  
3416093 High performance dc amplifier circuit having inherently low offset current  
3379973 Impedance measuring circuit having the unknown impedance in the feedback path of an amplifier  
3379987 Admittance neutralizer  
3378784 Amplifying circuit having means for reducing operating voltage source hum  
3356962 Frequency selective amplifier-oscillator having multiple feedback paths  
3317851 Frequency and amplification stabilized high power amplifier  
3309511 Hyperbolic function generator  
3233177 Radio frequency receiver gain control system with constant input impedance  

Matches 1 - 50 out of 69 1 2 >