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| Number | Title | Issue Date |
| 7961043 | Single-ended amplifier In an amplifier arrangement comprising an amplifier (AO) having an output, a first feedback (Rfb) between the output and an input side of the amplifier, a load (RL) having a first terminal coupled to the output and a second terminal,... | 06/14/2011 |
| 7855598 | Electronic signal processor An electronic signal processor for processing signals includes a complex first filter, one or more gain stages and a second filter. The first filter is characterized by a frequency response curve that includes multiple corner frequencies, with some corner frequencie... | 12/21/2010 |
| 7683710 | Electronic signal processor An electronic signal processor for processing signals includes a complex first filter, one or more gain stages and a second filter. The first filter is characterized by a frequency response curve that includes multiple corner frequencies, with some corner frequencie... | 03/23/2010 |
| 7403067 | Compensation circuit for amplifiers having multiple stages An amplifier circuit comprises a first capacitance having one end that communicates with an input of a first amplifier stage. An amplifier has a first gain, an input that communicates with an opposite end of the first capacitance, and an output. A second capacitance... | 07/22/2008 |
| 7403068 | Method for double sampling loop negative feedback and double sampling negative feedback amplifier A method for double sampling loop negative feedback comprising: obtaining a low-frequency feedback signal from the output of the amplifier; obtaining a high-frequency feedback signal from part of the amplifier of which high-frequency phase shift is low, wherein two-... | 07/22/2008 |
| 7366427 | Line driver with variable bandwidth control A method and apparatus to provide bandwidth control in a high speed line driver circuit is described. ... | 04/29/2008 |
| 7327458 | Spectral sensitivity composing system An output current from each pixel sensor can be extracted at an arbitrary ratio by a current divider. An arithmetic control unit sets the dividing ratio in correspondence to a color matching function. The current components are added together by a summing amplifier ... | 02/05/2008 |
| 7279970 | Feedback circuit For reducing various adverse effects due to provision of a low-pass filter, while suppressing an oscillation generated therein, there is provide a feedback circuit, having at least one operational amplifier, having a low-pass filter in an output portion thereof, for... | 10/09/2007 |
| 7266159 | Frequency-dependent magnitude pre-distortion on non-baseband input signals for reducing spurious emissions in communication networks Pre-distortion, whose magnitude—and preferably phase—are frequency-dependent, is applied to a non-baseband input signal in order to reduce spurious emissions resulting from subsequent amplification of the signal. In preferred embodiments, the pre-distortion tech... | 09/04/2007 |
| 7248642 | Frequency-dependent phase pre-distortion for reducing spurious emissions in communication networks A frequency-dependent phase pre-distortion technique is applied to an input signal in order to reduce spurious emissions resulting from subsequent amplification of the signal. In preferred embodiments, the frequency-dependent phase pre-distortion of the present inve... | 07/24/2007 |
| 7197085 | Frequency-dependent magnitude pre-distortion for reducing spurious emissions in communication networks Pre-distortion, whose magnitude—and preferably phase—are frequency-dependent, is applied to an input signal in order to reduce spurious emissions resulting from subsequent amplification of the signal. In preferred embodiments, the pre-distortion technique of the... | 03/27/2007 |
| 7151405 | Estimating power amplifier non-linearity in accordance with memory depth Reducing a non-linearity effect of a power amplifier includes receiving signals at off-line inverse and forward models. The signals include an input signal, a pre-distorted signal, and an output signal. The output signal exhibits distortion with respect to the input... | 12/19/2006 |
| 7139327 | Digital pre-distortion of input signals for reducing spurious emissions in communication networks Pre-distortion, whose magnitude—and preferably phase—are frequency-dependent, is applied to an input signal in order to reduce spurious emissions resulting from subsequent amplification of the signal. In preferred embodiments, the pre-distortion technique of the... | 11/21/2006 |
| 7061313 | Dual feedback linear amplifier A dual feedback topology imparts stability to a multistage linear amplifier, particularly by improving overall amplifier phase margin at higher signal frequencies. With dual feedback, an inner feedback loop is closed around the first amplifier stage, which stage is ... | 06/13/2006 |
| 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 |
| 7010284 | Wireless communications device including power detector circuit coupled to sample signal at interior node of amplifier A multi-stage amplifier is coupled with a power detector. The multi-stage amplifier includes a plurality of amplifier stages in series, with a signal path extending through them. The power detector is coupled to an interior node of the amplifier along the signal pat... | 03/07/2006 |
| 7002409 | Compensation circuit for amplifiers having multiple stages A compensation circuit is provided for an amplifier including at least first and second amplifier stage. The circuit includes a first capacitance including one end that communicates with an input of the first amplifier stage. An amplifier includes a first gain, an i... | 02/21/2006 |
| 6946910 | Configurable feedback path in an amplitude control system A configurable feedback path is included in an amplitude control system having a signal source and an amplitude controller, and provides accurate tracking between a signal provided at a test port and a reference signal, whether or not the configurable feedback path ... | 09/20/2005 |
| 6825718 | Impedance matching circuit The present invention discloses an impedance matching circuit which is suitable to be applied on an IC chip. The impedance matching circuit comprises a resistor unit, an OP amplifier circuit connected with the resistor unit, a feedback selecting circuit connected in... | 11/30/2004 |
| 6646463 | Impedance emulator A method and device to emulate impedances includes a pair of impedances connected in series between two circuit nodes, the impedances forming a voltage divider having at its midpoint a reference voltage VX. An OP AMP includes a positive input c... | 11/11/2003 |
| 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 |
| 6566947 | Combined active impedance and filter in line drivers A line driver combining active impedance and filter in one stage for connection to a transmission line having a characteristic impedance. The line driver comprises an amplifier, a transformer with a primary to secondary winding ratio of 1:n, a reference i... | 05/20/2003 |
| 6392478 | Amplification device having an adjustable bandwidth The invention relates to a device for amplifying electronic signals, including: an amplifier PRA, and a plurality of feedback loops G1, G2 placed between the output and the input of the amplifier, which feedback loops are arranged so that each feedback lo... | 05/21/2002 |
| 6359505 | Complementary pair-configured telecommunication line driver having synthesized output impedance A synthetic impedance line driver for driving a telecommunication line includes a complementary operational amplifier pair having cross-coupled positive feedback summing resistors. The driver circuit is configured to provide a relatively large multiplicat... | 03/19/2002 |
| 6351137 | Impedance emulator A method and device to emulate impedances includes a pair of impedances connected in series between a supply voltage and ground, the impedances forming a voltage divider having at its midpoint a reference voltage Vx. An OP AMP includes a positi... | 02/26/2002 |
| 5939951 | Methods and apparatus for modulating, demodulating and amplifying An apparatus is disclosed for processing an input signal. The apparatus includes two feedback loops for generating output signal components from the input signal. Each loop contains an oscillator, which has a frequency or phase which is variable in respon... | 08/17/1999 |
| 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 |
| 5828264 | Two-stage operational amplifier circuit with wide output voltage swings A two stage operational amplifier circuit comprises a first stage (31) having an input (2, 4) and an output, and a second stage (33) having an input and an output (19). The second stage input is coupled to receive the first stage output. A feedback path (... | 10/27/1998 |
| 5815804 | Dual-band filter network A dual band filter network for a radio communication apparatus is provided. The network has an antenna (212) for receiving and transmitting signals from a first frequency band and a second frequency band. The network has a first duplex pair (202) includin... | 09/29/1998 |
| 5719527 | Method and apparatus for amplifying, modulating and demodulating A highly efficient linear amplifier and/or modulator and demodulator comprising first and second feedback loops is provided. Each loop processes a component of the input signal and the component signals are recombined at, for example, a summing junction 1... | 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 |
| 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 |
| 5317277 | Power amplifying apparatus for supplying A.C. signals having a maximum loop gain at a desired frequency The invention features power amplifying apparatus with controllable frequency characteristic of the gain. The apparatus includes a band pass network of two cascaded amplifiers and multiple resistors and capacitors arranged to form multiple feedback loops.... | 05/31/1994 |
| 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 |
| 4775842 | Multi-output feedback amplifier A feedback amplifier for providing an amplified signal to first and second utilization networks includes first and second feedback paths. The amplifier output is coupled via a first coupling resistor to a first terminal to which the first utilization netw... | 10/04/1988 |
| 4757270 | High gain feedback amplifier Feedforward of the source signal into the compensation mode of an operational amplifier produces more than an order of magnitude improvement in small-signal capability at high frequencies. The technique is useful for active filters and wideband amplifiers... | 07/12/1988 |
| 4710727 | Nonlinear distortion synthesizer using over-threshold power-function feedback A nonlinear distortion synthesizer having an amplifier and one or more over-threshold power-function negative-feedback paths. Each negative-feedback path provides a feedback signal which is separately adjustable for each signal polarity. The feedback sign... | 12/01/1987 |
| 4661789 | Microwave recursive filter A broadband microwave recursive filter that provides sharp transitions in the frequency domain between adjacent stop and passbands comprising a signal input node; a signal output node; a filter circuit connected between the signal input node and the signa... | 04/28/1987 |
| 4644138 | Temperature control system with simplified controller and power supply The invention includes a simple and inexpensive thermal controller and simple and inexpensive radio frequency alternating current generator which are provided in an improved temperature control system for a resistively heated electrochemical cell. The tem... | 02/17/1987 |
