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| Number | Title | Issue Date |
| 8164386 | Methods and apparatus to control rail-to-rail class AB amplifiers In one example, an amplifier for providing stable output quiescent current comprising includes a number of supply rails, an output device configured for providing an output voltage, the output device coupled to the plurality of supply rails, and an output quiescent ... | 04/24/2012 |
| 7321752 | Linear amplification arrangement with non-linear amplifier element for a mobile radio device A system and method to optimize the efficiency of an amplifier device is provided by the including a non-linear amplifier in a mobile radio device. A phase displaced signal in relation to the input signal is respectively produced in the amplifier device with a non-l... | 01/22/2008 |
| 7279973 | H-bridge utilizing intermediate switching phase(s) An H-bridge circuit capable of performing switching using one or more intermediate voltage phases each held for a period of time in the midst of the switching operation. This reduces power dissipation associated with the switching operation, while only using one set... | 10/09/2007 |
| 7256724 | Image sensor including variable ramping slope and method An image sensor an image sensor includes an image sensing element which converts incident light into an analogue signal, a voltage generator which includes a variable resistor circuit and which generates a ramping voltage, where a slope of the ramping voltage is var... | 08/14/2007 |
| 7256654 | Amplifying a signal using a current shared power amplifier A power amplifier includes amplifier stages. An amplifier stage includes a transistor, and at least one amplifier stage comprises a driver stage. The amplifier stages include a first amplifier stage having a first transistor and associated with a first output power,... | 08/14/2007 |
| 7230488 | Amplifying circuit, noise reducing apparatus and power converting apparatus An amplifying circuit, which generates a compensation current based on a detection result of a leakage current flowing between an AC power source for supplying power and a power converting circuit section, includes a main amplifier having transistors and a correctio... | 06/12/2007 |
| 7193458 | Power supply for guitar amplifier A power supply for a guitar amplifier and the guitar amplifier and method of operating the guitar amplifier. The power supply includes an alternating current power input having a secondary winding and a filament winding, an output and a first vacuum tube rectifier c... | 03/20/2007 |
| 7167050 | Operational amplifier having large output current with low supply voltage An operational amplifier including a differential input section generating a first signal as a differential voltage between two input signals; an amplifying section amplifying the first signal into second and third complementary signals; a first MOS transistor betwe... | 01/23/2007 |
| 7091772 | Power amplification by using different fixed power supply signals for the amplifier The present invention proposes a power amplification under variable envelope excitation, wherein an original input signal at least is converted into a phase modulated signal part, at least the phase modulated signal part is fed to an input port of an amplifier unit,... | 08/15/2006 |
| 7088795 | Ultra wide band base band receiver The present invention is a receiver having a radio frequency (RF) front end, a pulse detector operatively coupled to the RF front end, and a data recovery unit operatively coupled to the pulse detector. The data recovery unit is configured to receive spread spectrum... | 08/08/2006 |
| 7076055 | Tracking switchmode power converter for telephony interface circuit A comparator-based switchmode power converter monitors the most negative of the tip and ring line voltages, to control the supply voltage to a SLIC. The voltage applied to the SLIC's power terminals is slightly higher than the sensed voltage for different loop signa... | 07/11/2006 |
| 7053699 | Current output stages Current output stages are provided. In accordance with an embodiment, a current output stage includes a voltage follower circuit, a first current mirror and a second current mirror. A node of the voltage follower circuit provides a voltage that follows a voltage at ... | 05/30/2006 |
| 7035246 | Maintaining a global time reference among a group of networked devices Synchronization is maintained among a plurality of network devices having local clocks that participate in a network. A first packet is broadcast from a first network device to other network devices that participate in the network. The first packet includes a global... | 04/25/2006 |
| 7030695 | Low threshold voltage circuit employing a high threshold voltage output stage An amplifier circuit uses low threshold voltage devices for mid rail response in low voltage applications, but uses a high threshold voltage device at an output stage of the amplifier to generate an output from the amplifier. ... | 04/18/2006 |
| 7031294 | Baseband wireless network for isochronous communication A wireless communication network system apparatus which provides for isochronous data transfer between node devices of the network, which provides at least one master node device which manages the data transmission between the other node devices of the network, whic... | 04/18/2006 |
| 7026865 | Analogue amplifier with multiplexing capability An analogue amplifier with multiplexing capability, without the need to incorporate a multiplexor, comprising an input port, a test input port, an output port, a control input to switch the amplifier between a normal amplifying mode and a test mode, wherein a analog... | 04/11/2006 |
| 7012467 | Apparatus and method for compensating operating current in an amplifier when supply voltage varies An apparatus for compensating operating current in an amplifier device when supply voltage to the amplifier device decreases below a predetermined value at an input voltage supply locus includes: (a) A first control circuit coupled with the input voltage supply locu... | 03/14/2006 |
| 6944148 | Apparatus and method for managing variable-sized data slots within a time division multiple access frame A reliable Medium Access Control layer protocol and method employing centralized management of communication in a Time Division Multiple Access network architecture. The Medium Access Control layer protocol implements Quality of Service guaranties to the layers of t... | 09/13/2005 |
| 6940703 | Overvoltage protection circuit An overvoltage protection circuit for interposing between an input voltage and a supply voltage is described. The overvoltage protection circuit includes switch circuitry connected to and passing current between an input voltage node and a supply voltage node, the i... | 09/06/2005 |
| 6930551 | Zero voltage class AB minimal delay output stage and method A class AB output circuit includes a P-channel pullup transistor (M13) having a source coupled to a supply voltage, a drain coupled to an output(10), a gate coupled to respond to an input signal on an input(9), an N-channel pulldown transistor (... | 08/16/2005 |
| 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 |
| 6897729 | Self-calibrating gain control circuit for low noise amplifier An amplifier comprises a Low Noise Amplifier (LNA) that amplifies a Radio Frequency (RF) signal that includes a transconductance, a gain and an input stage that receives the RF signal. A bias assembly includes a bias circuit with a bias resistance and generates a bi... | 05/24/2005 |
| 6842525 | Signal amplification circuit and process for neutralizing noise from a power supply voltage An amplification circuit is provided for the signal output from a microphone in which the signal is amplified by a differential structure amplifier. The circuit includes the pull-up voltage, which initializes the operating state of the microphone, being coupled to a... | 01/11/2005 |
| 6784738 | Method and apparatus for gain control in a CMOS low noise amplifier An amplifier comprising a Low Noise Amplifier (LNA) to amplify a Radio Frequency (RF) signal. The LNA having a transconductance and including an input stage to receive the RF signal. The LNA again varying as a function of changes in conditions. A bias assembly to ge... | 08/31/2004 |
| 6630865 | Push-pull amplifiers A push pull amplifier is disclosed having upper and lower output devices operating in a mode in which the devices drive a load alternately. The amplifier includes bias means for providing a bias current to the output devices at all times. The bias means i... | 10/07/2003 |
| 6600371 | Low noise amplifier It is shown a low noise amplifier comprising a first circuit block suitable for converting a first amplifier input voltage signal into current, a second circuit block adapted to divide the current coming from said first block, said second block being cont... | 07/29/2003 |
| 6556084 | Linearized class C amplifier with dynamic biasing A power amplifier circuit includes an amplifying transistor and a dc bias circuit for biasing the amplifying transistor to obtain a conduction angle of less than about 180°. The dc bias circuit includes a dynamic biasing circuit for decreasing the dc bia... | 04/29/2003 |
| 6445244 | Current measuring methods A sensor for measuring a current passing through a load. The sensor has a power transistor having a first terminal connected to substantially constant voltage and a second terminal connected to the load. The sensor can sample a voltage difference with a v... | 09/03/2002 |
| 6417733 | High output voltage swing class AB operational amplifier output stage An output stage (10) is provided having transistors of the same polarity type, which function to amplify the input signal at a wide range of frequencies, with low power consumption and low crossover distortion. By biasing the output transistors to remain ... | 07/09/2002 |
| 6369653 | Apparatus and methods for improved control of quiescent state of output transistors in a class AB amplifier A class AB amplifier biasing circuit is provided for controlling the quiescent state of a pull-up output device and a complimentary pull-down output device. The biasing circuit includes first and second current sources, each having a floating resistor con... | 04/09/2002 |
| 6300837 | Dynamic bias boosting circuit for a power amplifier A power amplifier circuit includes an amplifying transistor and a dc bias circuit for biasing the amplifier transistor to obtain a conduction angle of at least about 180°. The dc bias circuit includes a dynamic bias boosting circuit for increasing the dc... | 10/09/2001 |
| 6294945 | System and method for compensating the dielectric absorption of a capacitor using the dielectric absorption of another capacitor A system and method, wherein the dielectric absorption of a capacitor is cancelled by a compensating circuit. One embodiment uses a compensation circuit comprising a compensating capacitor with substantially identical characteristics as the capacitor to b... | 09/25/2001 |
| 6292057 | Output stage of an operational amplifier and method having a latchup-free sourcing current booster for driving low impedance loads Responsive to an external load, an output stage (201) of an amplifier (200) in accordance with the present invention provides a current boosting scheme capable of generating a large output current while maintaining a low quiescent current. The output stag... | 09/18/2001 |
| 6275108 | Circuit and method for control of amplifier operating angle A method and apparatus for controlling amplifier operating angle provides a corresponding increase in amplifier efficiency through a continual adjustment of operating angle from Class A, through Class AB, to Class B, an improved bandwidth in the output st... | 08/14/2001 |
| 6268771 | Amplifying device A MOSFET (1) performing a current source operation and a MOSFET (2) performing a current sink operation are both of n-channel type. An input voltage (Vin) to be inputted to a gate electrode of the MOSFET (2) is divided by two resistance elements (6 and 7)... | 07/31/2001 |
| 6222417 | Amplifier output stage provided with a parasitic-current limiter An output stage for an amplifier AMP includes a first transistor T1 and a second transistor T2 having their main current paths arranged between two power supply terminals VCC and GND, the bias terminal of the first transistor T1 being connected to the out... | 04/24/2001 |
| 6215356 | Power amplifier arrangement An amplifier arrangement includes a class-G amplifier, biased by a first and a second pair of bias voltages, a drive control circuit and a second amplifier (C) biased by the second pair of supply voltages, the drive control circuit (DCD) thereby being ada... | 04/10/2001 |
| 6160441 | Sensors for measuring current passing through a load A sensor for measuring a current passing through a load. The sensor has a power transistor having a first terminal connected to substantially constant voltage and a second terminal connected to the load. The sensor can sample a voltage difference with a v... | 12/12/2000 |
| 5963093 | Class AB output stage wih reduced distortion An output stage of an amplifier circuit includes: a sinking bipolar circuit 23 for sinking current from an external load; a sourcing transistor 14 for sourcing current to the external load, the sourcing transistor 14 coupled in series with the sinking bip... | 10/05/1999 |
| 5952881 | Power stage, particularly for an operational amplifier A power stage for an operational amplifier includes an output stage, a current source stage, and a gain stage. The output stage is formed by first and second NPN output transistors arranged in a Totem-Pole configuration, each having respective resistors c... | 09/14/1999 |
