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| Number | Title | Issue Date |
| 7679437 | Split-feedback technique for improving load regulation in amplifiers A circuit arrangement and method for improving load regulation in an amplifier (e.g., LDO amplifier) uses a feedback circuit including a parallely connected feedback resistance Rf and a noise reduction feedback capacitance Cf, wherein an external capacitance has equ... | 03/16/2010 |
| 6501255 | Differential current source with active common mode reduction A voltage-controlled current source provides operation as either a differential current source for a floating load, or operation as a grounded current source when one end of the load is grounded. Switching between operation as a differential current sourc... | 12/31/2002 |
| 5815040 | Wide bandwidth, current sharing, MOSFET audio power amplifier with multiple feedback loops A wide bandwidth, multi-FET current sharing output stage, MOS audio power amplifier employs multiple feedback loops. An audio input is supplied to a voltage feedback amplifier stage driving a push-pull voltage gain/phase splitter stage. A bias adjustment ... | 09/29/1998 |
| 5796305 | Amplifier arrangements with high damping factor A circuit for increasing damping factor in an audio amplifier adapted to be coupled to a load by output feed and return leads and components having an impedance causing a reduction in the damping factor, employs a balanced feedback network having first an... | 08/18/1998 |
| 5781068 | Transadmittance amplifier for a motor A transadmittance amplifier provides an output current that is proportional to an input voltage level. The output current drives a coil of an electric motor (the load) through a sense resistor, the voltage drop across the sense resistor providing an indic... | 07/14/1998 |
| 5734728 | Portable sound speaker system and driving circuit therefor A speaker system includes a vertically oriented elongated tube supported on a ground surface, and open at upper and lower ends thereof; a woofer, mid-range speaker and tweeter mounted at a lower end of the tube, the woofer having a front driving face with... | 03/31/1998 |
| 5719526 | Internal load monitor for amplifier A load monitor module for measuring voltage and current supplied from an amplifier to a load is provided within an amplifier and includes a device for calculating an impedance of the load and an amount of power delivered to the load from the amplifier. Th... | 02/17/1998 |
| 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 |
| 5245296 | Audio amplifier circuit and method of operation An audio amplifier circuit which improves the efficiency, performance and power in a loudspeaker system. The circuit includes a discriminator differential amplifier which senses the motional voltage from the moving coil of a loudspeaker. The output signal... | 09/14/1993 |
| 5153499 | Precision voltage controlled current source with variable compliance A voltage controlled current source with variable compliance produces a load current through a load impedance where the load current value is substantially independent of the value chosen for the load impedance. The value of the current is substantially p... | 10/06/1992 |
| 5036228 | Temperature compensation circuit for negative impedance driving apparatus A temperature compensation circuit used in a negative impedance driving apparatus such as an amplifier for driving a speaker as a load. A current flowing through the load is detected by a detection element connected to the load, and fed back therefrom, so... | 07/30/1991 |
| 4897610 | Negative-feedback amplifier with accurately defined input or output impedance combined with high or low output or input impedance respectively Negative-feedback amplifier provided with an active amplifier section operating approximately as a nullor and a negative feedback section, the amplifier having a high loop gain. The active amplifier section is constructed in balanced form with two nullors... | 01/30/1990 |
| 4797933 | Bass amplifier with high frequency response A method of improving the frequency reproduction at frequencies higher than a certain break frequency (fs) of a bass amplifier known per se within the audio frequency range. The amplifier has a low-pass filter portion (ACE1) and a power amplifier portion ... | 01/10/1989 |
| 4766396 | Current source type current output circuit using current mirrors A current source type current output circuit for applying to a load a current which is proportional to an input includes an amplifier of the type receiving a current and producing a voltage, and a feedback circuit for feeding back an output of the amplifi... | 08/23/1988 |
| 4638258 | Reference load amplifier correction system A system which corrects for adverse characteristics such as reactance, inertia and resonances of a power amplifier driven load such as a speaker or multiple speaker system. Program voltage is applied to a reference load which has electrical characteristic... | 01/20/1987 |
| 4628275 | Efficient power amplifier for high capacitive devices An efficient power amplifier for high-capacitive device C2 in load string 10. The load string 10 includes a reference capacitor C3, a resistor R1, and an inductor L1. A large capacitor C1 is connected to load string 10 through high voltage power bridge 28... | 12/09/1986 |
| 4598212 | Driver circuit A driver circuit for applying a first signal having a desired wave form, frequency and peak to peak voltage to a coaxial transmission line which also has applied to it a second signal having a substantially higher frequency. An operational amplifier has t... | 07/01/1986 |
| 4482866 | Reference load amplifier correction system A system which corrects for adverse characteristics such as reactance, inertia and resonances of a power amplifier driven load such as a speaker or multiple speaker system. Program voltage is applied to a reference load which has electrical characteristic... | 11/13/1984 |
| 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 |
| 4321552 | Amplifier comprising a first and a second amplifier element An amplifier comprising a first and a second amplifier element, whose outputs are connected to a load, a difference circuit which comprises a comparator, in which the output signal of the first amplifier element is compated with the input signal thereof t... | 03/23/1982 |
| 4290024 | Voltage-to-current converter circuit A voltage-to-current converter circuit comprises first and second amplifiers each having a noninverting input, an inverting input and an output, the noninverting inputs of the first and second amplifiers being respectively connected to an input terminal f... | 09/15/1981 |
| 4274016 | Voltage-to-current converter A vibration densitometer having a magnetostrictive drive with a coil, and a crystal pick-up. A loop circuit including a driver amplifier provides the coil with current which leads the crystal voltage by 90 degrees for maximum efficiency. The driver amplif... | 06/16/1981 |
| 4260954 | Amplifier load correction system According to the present invention circuit means and method are provided which correct for variations in an amplifier load such as a speaker by sensing the load current, developing a feedback signal related to the load current, comparing this feedback sig... | 04/07/1981 |
| 4253070 | Feedback arrangement An arrangement to provide feedback to amplifier systems incorporating an electrical load. A current transformer in conjunction with a resistor is incorporated to provide a feedback correction signal to an amplifier which corrects for distortion caused by ... | 02/24/1981 |
| 4236118 | Stabilized remote sensing high fidelity apparatus In a high-fidelity sound reproducing system wherein the speaker is located remotely from the amplifier and therefore the electrical signals reaching the speaker are subject to distortion from the capacitive and inductive reactance of the conductors joinin... | 11/25/1980 |
| 4223273 | Power amplifying device for driving loudspeakers A power amplifier device comprising first and second output terminals connected to a loudspeaker, and a power amplifier having a non-inverting input supplied with an audio signal, an output connected to the first output terminal and an inverting input. Th... | 09/16/1980 |
| 4185249 | Bipolar signal to current converter Signal currents corresponding to a voltage to be converted into current or to a current to be amplified are applied to one input of an operational amplifier and its other input is referenced to ground. Its output is connected via a power amplifier and a s... | 01/22/1980 |
| 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 |
| 4001703 | Transmission line interface circuit An interface circuit for a transmission line between a remote transmitter and a central control room instrument includes an operational amplifier. The input of the operational amplifier is derived from the current drawn by the remote transmitter. The outp... | 01/04/1977 |
| 3972002 | Dual feedback amplifier Current and voltage feedback are used in separate frequency dependent major loops around a high gain broadband amplifier to produce frequency shaped gain and matched input and output impedances.... | 07/27/1976 |
| 3970953 | Distortion-free amplifiers A distortion-free amplifier for electric signals has a high-quality low-power amplifier-section. In addition there is a high-power amplifier-section which delivers the majority of the current to the load. A feedback signal is derived which is a measure of... | 07/20/1976 |
