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| Number | Title | Issue Date |
| 7365597 | Switched capacitor amplifier with higher gain and improved closed-loop gain accuracy A switched capacitor CMOS amplifier uses a first stage non-inverting CMOS amplifier driving a second stage inverting CMOS amplifier. The first stage amplifier is provided with positive feedback to substantially increase the gain of the first stage amplifier. In the ... | 04/29/2008 |
| 7265624 | Amplifier circuit The present invention provides an amplifier circuit comprising a differential amplifier and a negative feedback loop circuit, in which a positive feedback loop circuit having a gain smaller than a gain of the negative feedback loop circuit is formed inside the negat... | 09/04/2007 |
| 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 |
| 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 stage circuit of the negative resistance circuit is a collector-emitter... | 01/10/2006 |
| 6967530 | Circuit and semiconductor device for reducing the generation of shock noise of a power amplifier outputting amplified audio signals A circuit for a power amplifier is disclosed which amplifies and outputs an audio signal by amplifying an input audio signal using first and second differential circuits, and driving a push-pull output transistor with the outputs from the first and second differenti... | 11/22/2005 |
| 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 tuning circuit operates stably and is constituted by a series resonance ... | 10/11/2005 |
| 6920336 | Broadband driver Broadband driver for signals that are transmitted in different frequency ranges, comprising: (a) a first broadband driver circuit (19) for driving first signals having signal frequencies that lie in a first frequency range; (b) a sec... | 07/19/2005 |
| 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 and design and adjustment thereof is easy. The tuning circuit compris... | 03/22/2005 |
| 6822510 | Power-off, loop-through return-loss with negative capacitance An improved power-off, loop-through return-loss characteristic for a current feedback operational amplifier is provided by adding a positive feedback capacitor between the input and output of the operational amplifier. The positive feedback capacitor results in a ne... | 11/23/2004 |
| 6600367 | Low distortion amplifier An electronic amplifier providing very low distortion which includes an output stage with an output error correction stage containing two amplifiers and wherein there are at least four local negative feedback paths, an output of the first amplifier being ... | 07/29/2003 |
| 6600366 | Differential line driver circuit Differential line driver circuit for driving a line signal output via a signal line.... | 07/29/2003 |
| 5856758 | Low distortion driver employing positive feedback for reducing power loss in output impedance that effectively matches the impedance of driven line A line driver with positive feedback reduces the output signal amplitude excursion required for driving a communication line, and enables the driver's output impedance to be synthesized using a reduced component value, thereby achieving a reduction in pow... | 01/05/1999 |
| 5684433 | Dual-feedback amplifier circuit arrangements In an amplifier circuit arrangement in which series resistive feedback is utilized in the main amplifier to minimize distortion, and a feedback amplifier is provided in a path from the output of the arrangement to the series feedback path effectively to b... | 11/04/1997 |
| 5398004 | HBT direct-coupled low noise wideband microwave amplifier A wideband low noise amplifier is provided which includes an input for receiving an input signal and an output for providing an amplified output signal which may vary over a wide frequency range while exhibiting minimum noise interference. The amplifier i... | 03/14/1995 |
| 5384530 | Bootstrap voltage reference circuit utilizing an N-type negative resistance device A bootstrap voltage reference circuit having an amplifier with a positive feedback network including a non-linear device which operates as a current source. The non-linear device may be an n-type negative resistance device such as a tunnel diode. The circ... | 01/24/1995 |
| 5374966 | Low noise impedance-matched video amplifier A video amplifier having a reduced noise figure is realized by eliminating the need for a resistive matching termination at the input of the amplifier. A negative feedback loop reduces the effective input impedance of the amplifier by generating an active... | 12/20/1994 |
| 5157347 | Switching bridge amplifier Bridge amplifier circuit including a linear amplifier stage (3) which in single-ended configuration drives a load (13). Once the output voltage (U0) at the output (7) of the amplifier stage (3) has reached the maximum or minimum output swing li... | 10/20/1992 |
| 4916409 | Signal conditioner system for musical instruments An audio signal conditioning system comprising a power supply for providing a direct current having a predetermined voltage; input gain control device for receiving the audio sound output signals and for controlling gain; a first transistor amplifier conn... | 04/10/1990 |
| 4858094 | Switched mode power supply with improved load regulation Improved load regulation is provided in a switched mode power supply having an integrator, with a controlled reference signal connected thereto, a comparator circuit and a square wave generator, connected to the terminals of an AND circuit, and AND circui... | 08/15/1989 |
| 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 communication pair. Prior art battery feed circuits use either ... | 11/10/1987 |
| 4684886 | Automatic equalizer An automatic equalizer for an electronic measuring instrument using a transducer to measure a physical quantity. A signal amplifier in the instrument has a positive feedback application point and a negative feedback application point. The automatic equali... | 08/04/1987 |
| 4630046 | Broadband switching network in matrix form A broadband switching network in matrix form composed of a plurality of rows and a plurality of columns, and including a plurality of crosspoint switching circuits each having an input and an output and each associated with a respective row and a respecti... | 12/16/1986 |
| 4397368 | Driving circuits of solenoid actuated devices In a solenoid actuated device for controlling the oil supplied to a power steering unit of a motor car, a driving circuit is provided to pass current through the solenoid. The driving circuit comprises a comparator supplied with an analogue control signal... | 08/09/1983 |
| 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 |
| 4125813 | Operational amplifier decoupling circuit A sample and hold circuit is disclosed which employs a matched pair of operational amplifiers as a decoupling circuit to isolate the output of the sample and hold circuit from the sampling capacitor. Prior art decoupling circuits employ a simple isolation... | 11/14/1978 |
| 4110677 | Operational amplifier with positive and negative feedback paths for supplying constant current to a bandgap voltage reference circuit A voltage regulator circuit including an operational amplifier having supply voltage terminals connected to a source of unregulated supply voltage and a two-terminal, essentially zero temperature coefficient, semiconductor bandgap voltage reference circui... | 08/29/1978 |
| 4088961 | Operational amplifier driver circuit An operational amplifier driver circuit for supplying an undistorted ac signal to a resistive load connected across a balanced pair of twisted transmission lines where the balanced lines have common mode noise signals thereon due to the presence of substa... | 05/09/1978 |
| 4085379 | Amplifier for floating voltage source A differential amplifier is arranged to amplify faithfully the voltage produced by an ungrounded voltage source to provide the amplified result as a voltage in relation to a reference (ground) voltage. Errors resulting from leakage resistances between the... | 04/18/1978 |
| 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 |
