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| Number | Title | Issue Date |
| 7151283 | Light-radiating semiconductor component with a luminescence conversion element The light-radiating semiconductor component has a radiation-emitting semiconductor body and a luminescence conversion element. The semiconductor body emits radiation in the ultraviolet, blue and/or green spectral region and the luminescence conversion element conver... | 12/19/2006 |
| 7126162 | Light-radiating semiconductor component with a luminescence conversion element The light-radiating semiconductor component has a radiation-emitting semiconductor body and a luminescence conversion element. The semiconductor body emits radiation in the ultraviolet, blue and/or green spectral region and the luminescence conversion element conver... | 10/24/2006 |
| 7078732 | Light-radiating semiconductor component with a luminescence conversion element The light-radiating semiconductor component has a radiation-emitting semiconductor body and a luminescence conversion element. The semiconductor body emits radiation in the ultraviolet, blue and/or green spectral region and the luminescence conversion element conver... | 07/18/2006 |
| 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 signal amplification system, a control system (9) is used for s... | 01/06/1998 |
| 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 connected parallel to the integration capacitor. A current... | 12/06/1994 |
| 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 base, emitter and collector, has its base coupled to the volta... | 01/14/1992 |
| 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 node; two ohmic voltage dividers each being formed of two resistors... | 12/13/1988 |
| 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. An impedance circuit is connected to both outputs of the f... | 12/29/1987 |
| 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 which divides only an a.c. component of the output of an opera... | 12/30/1986 |
| 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 one input for magnifying the apparent value of the impedan... | 09/24/1985 |
| 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 feedback in order to reduce the sensitivity of settling time and ... | 02/26/1985 |
| 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 integrated capacitors, and a low frequency stabilizing pole in t... | 06/07/1983 |
| 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 several hundred thousand ohms. The frequency range is from... | 10/12/1982 |
| 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 varies with the input but is independent of the load value and a... | 07/20/1982 |
| 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 transfer functions are to be adjusted to a inverse componen... | 03/30/1982 |
| 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 having a feedback resistor connecting the inverting and ou... | 05/19/1981 |
| 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 capacitor is charged towards the supply potential (V) by a co... | 03/11/1980 |
| 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 polynominals in the Laplace operator S. In any notch filter, the coe... | 05/29/1979 |
| 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 including circuitry for autozeroing the amplifier.... | 05/01/1979 |
| 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 amplifier feedback circuit uses the linear potentiometer a... | 04/24/1979 |
| 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 in the gain of the amplifier system will only change the g... | 08/15/1978 |
| 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 amplifier to receive an amplified audio signal from the amplifie... | 08/15/1978 |
| 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 the control voltage and an electronically controllable varia... | 07/04/1978 |
| 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 in which the loud-speakers form two groups which, connected... | 05/30/1978 |
| 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, and to the output of the amplifier. In accordance with one ... | 05/02/1978 |
| 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 current amplifier system. The amplifier system utilizes a combina... | 03/14/1978 |
| 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 manner such as to be capable of selectively providing negativ... | 03/07/1978 |
| 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 gains, to adjust the respective basic gains of the amplifier ... | 10/25/1977 |
| 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 input of the operating amplifier is applied to the latter t... | 07/19/1977 |
| 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 connected in parallel with the center capacitor and the junct... | 09/28/1976 |
| 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 heating current source and an electronic switch which is contr... | 09/14/1976 |
| 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 output of a second stage being connected in feedback relations... | 07/27/1976 |
| 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 the operation of the succeeding circuit. The feedback circu... | 02/17/1976 |
