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| Number | Title | Issue Date |
| 7525376 | Power amplifier with output voltage compensation A power amplifier to provide a compensated output voltage to a load through a series-connected impedance. The power amplifier includes an inner positive current feedback loop that is capable of sensing changes in the resistance of the load, and which adjusts the eff... | 04/28/2009 |
| 7369816 | Highly accurate temperature sensor employing mixed-signal components A radio transceiver includes circuitry that enables received RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry ... | 05/06/2008 |
| 7202742 | Digital amplification device A digital amplification device has a digital amplifying unit, a low-pass filter for integrating a digital signal, and a current feedback circuit that is transformer-coupled to the low-pass filter and feeds back current to the differential input terminal. A signal re... | 04/10/2007 |
| 7053705 | Mixed-mode (current-voltage) audio amplifier A method and system for providing a mixed-mode (current- and voltage-source) audio amplifier is disclosed. The mixed-mode amplifier includes a voltage sensing feedback path including a first network comprising at least one circuit; and a current sensing feedback pat... | 05/30/2006 |
| 7012466 | Voltage-to-current converter A load responds to a voltage-to-current converter including a differential amplifier. A sensing resistor is series connected with the load and first and second feedback resistors, respectively included in first and second voltage dividers having taps connected to no... | 03/14/2006 |
| 6975734 | Audio apparatus of negative driving with adaptive gain control An audio apparatus is constructed for use in negative drive of a loudspeaker having an internal impedance to perform a desired amplitude-frequency characteristic. In the audio apparatus, an amplifier device drives the loudspeaker with a driving voltage. A feedback d... | 12/13/2005 |
| 6917245 | Absolute power detector A method and apparatus is provided for detecting the output power of a power amplifier. The output power is detected by detecting the absolute values of the voltage and current at the output of the amplifier and mixing the detected voltage and current to generate a ... | 07/12/2005 |
| 6756849 | Absolute power detector A method and apparatus is provided for detecting the output power of a power amplifier. The output power is detected by detecting the absolute values of the voltage and current at the output of the amplifier and mixing the detected voltage and current to generate a ... | 06/29/2004 |
| 6130582 | Amplifier circuit including compensation circuitry for canceling variations in an amplifier feedback signal An amplifier circuit (14') for canceling variations in an amplifier feedback signal includes compensation circuitry (50) defining a replica of the feedback current therethrough. The replicated feedback current is drawn from a circuit node (N1) which direc... | 10/10/2000 |
| 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 |
| 5761316 | Variable and reactive audio power amplifier This disclosure shows the solid state emulation of elements of a thermionic emission device amplifier which distinguish it from solid state amplifiers: the output impedance of transformer impedance with plate resistance, the transfer function coupling fro... | 06/02/1998 |
| 5761317 | Tube amplifier fat emulation structure This disclosure shows the solid state emulation of elements of a thermionic emission device amplifier which distinguish it from solid state amplifiers: the output impedance of transformer impedance with plate resistance, the transfer function coupling fro... | 06/02/1998 |
| 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 |
| 5382919 | Wideband constant impedance amplifiers A family of wideband amplifier circuits using series and shunt feedback over two stages to achieve constant impedance, including single-ended, single-ended input/differential output and differential input/differential output forms.... | 01/17/1995 |
| 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 |
| 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 |
| 4758798 | Output amplifier An amplifier system providing the voltage feedback which can be supplemented with current feedback without limiting the voltage excursion range at the amplifier system output.... | 07/19/1988 |
| 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 |
| 4611179 | Wide-band type high-frequency amplifier circuit A wide-band type high-frequency amplifier circuit characterized in that a voltage feedback circuit is connected across a base and a colletor of an amplifier transistor, a current feedback circuit is inserted into an emitter circuit, and a damper resistanc... | 09/09/1986 |
| 4590434 | High dynamic range amplifier with low noise and low distortion An amplifier uses non-dissipative elements to provide current and voltage feedback. The base amplifier has two input terminals, and the current and voltage feedback signals are applied to respective input terminals. The non-dissipative elements may be eit... | 05/20/1986 |
| 4414690 | Active aerial An active aerial for use in car radios and aerial "arrays" comprising an aerial element and an aerial connected thereto. In order to obtain a low distortion and a good signal-to-noise ratio in spite of the presence of protection diodes to prevent overload... | 11/08/1983 |
| 4393353 | Negative feedback amplifying circuit having voltage negative feedback and current negative feedback circuits A negative feedback amplifying circuit comprises an amplifier connected to a load, a voltage negative feedback circuit which negatively feeds back the output voltage of the amplifier to the input side of the amplifier maintaining a frequency selection cha... | 07/12/1983 |
| 4302726 | Current sources A current source in which the output current from an output amplifier stage (2) is controlled by an input signal, originating in a signal source (11), to an input amplifier stage (1) incorporates, additionally to a negative feedback path from the current ... | 11/24/1981 |
| 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 |
| 3938057 | Telecommunications signal amplifier A telecommunications signal amplifier comprising an active tripole the transfer function of which has a negative real portion, the input impedance and the output impedance of which are substantially equal to one another and to the iterative impedance of t... | 02/10/1976 |
