Did You Know...
...that the Band-Aid Bandage was invented by a Johnson & Johnson employee whose wife had cut herself? Earl Dickson's wife was rather accident prone, so he set out to develop a bandage that she could apply without help. He placed a small piece of gauze in the center of a small piece of surgical tape, and what we know today as the Band Aid bandage was born!
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| Number | Title | Issue Date |
| 8130038 | Class AB operational amplifier and output stage quiescent current control method A class AB operational amplifier includes: a first transistor, for generating a first current; a second transistor, where a second source voltage of the second transistor is equal to a first source voltage of the first transistor, for generating an output stage quie... | 03/06/2012 |
| 8031002 | Buffer amplifier A buffer amplifier has high input impedance and is less affected by temperature by supplying independent bias power to each of amplification units. The buffer amplifier includes a bias supply unit supplying bias power having a preset voltage level, an amplification ... | 10/04/2011 |
| 7999618 | High bandwidth, rail-to-rail differential amplifier with output stage amplifier An error amplifier expected to exhibit rail-to-rail operation, high bandwidth, and high slew rate, is described, the error amplifier comprising a first stage to receive an input differential voltage and to provide transconductance gain, an intermediate stage to prov... | 08/16/2011 |
| 7948316 | Low bias current amplifier An amplifier is provided that includes an output portion that sources and sinks current associated with an output load and an amplification portion that is biased by a relatively small bias current with respect to an output current of the amplifier. The amplificatio... | 05/24/2011 |
| 7944302 | Method and apparatus for biasing an amplifier An apparatus and method for biasing each amplifier of an amplification stage provides that the voltage across each current sensing element of each amplifier of the amplification stage is measured. For each pair of voltage measurements taken, a sum and difference is ... | 05/17/2011 |
| 7907013 | Class AB output stage with programmable bias point control A class AB output stage includes a driver to generate a first drive signal and a second drive signal, and two bias voltage sources to provide two bias voltages to level shift the first and second drive signals, in order to drive a pair of high side and low side tran... | 03/15/2011 |
| 7872531 | Amplifier bias techniques Techniques for generating a bias voltage for a class AB amplifier having first and second active transistors. In an exemplary embodiment, a diode-coupled first transistor supports a first current, and the gate voltage of the first transistor is coupled to the gate v... | 01/18/2011 |
| 7834699 | Audio compensation method and audio apparatus with class AB power amplifier An audio apparatus is provided, receiving a reference voltage and an input signal to generate an output signal. In the audio apparatus, a compensation circuit, generates a compensated reference voltage based on the input signal, the reference voltage and the output ... | 11/16/2010 |
| 7800447 | Operational amplifier with improved current monitoring and scalable output A low-power, low-voltage feedback class AB operational amplifier is disclosed. The minimum supply voltage is one gate-source voltage and two saturation voltages. Currents on the output p-type and n-type transistors are monitored as part of the feedback loop control.... | 09/21/2010 |
| 7772926 | Setting the DC operating current of a rail-to-rail output stage of an op-amp In an output stage of an operational amplifier, first and second transistors each provide a collector current under quiescent conditions to first and second current sources. A resistor receives a portion of one the collector currents and produces a resistor voltage ... | 08/10/2010 |
| 7733182 | Hybrid class AB super follower Various embodiments of a hybrid class AB super follower circuit are provided. One embodiment is a follower circuit comprising: an input node for receiving an input voltage signal; an output node for driving a capacitive load based on the input voltage signal; a tran... | 06/08/2010 |
| 7667540 | Class-AB driver design with improved frequency response A class-AB driver design with improved frequency response is disclosed. In one embodiment, the class-AB driver includes a push-pull output stage, a trans-linear loop, an input stage, a current biasing and enabling circuit. Further, the trans-linear loop is coupled t... | 02/23/2010 |
| 7646244 | Apparatus and method for unity gain buffer with high switching speed and low quiescent current A unity gain buffer is provided. The unity gain buffer includes two complementary pairs of emitter followers and two bias current sources. The top bias current source is arranged to provide a bias current so that, if the input voltage is greater than zero, the bias ... | 01/12/2010 |
| 7642853 | High-swing operational amplifier output stage using adaptive biasing An output stage includes two transistors (switching transistor and biasing transistor) coupled in series in a pullup current path between a VDDA node and an output node, and also includes two transistors (switching transistor and biasing transistor) coupled in serie... | 01/05/2010 |
| 7619476 | Biasing stage for an amplifier An amplifier biasing stage includes a transistor that provides a biasing signal for a complementary pair of field-effect transistors included in an output stage of an amplifier. The amplifier biasing stage also includes one resistive element connected to an emitter ... | 11/17/2009 |
| 7528660 | Power amplifier circuit and test apparatus There is provided a power amplifier circuit that applies an output voltage according to a given input voltage to a load, the power amplifier circuit includes an amplifying section of which an output port is connected to the load and that outputs the output voltage a... | 05/05/2009 |
| 7528661 | Low quiescent current output stage and method with improved output drive Circuitry for increasing the maximum output current magnitude of a diamond buffer (Q57,58,74,75) having increased maximum output current provides a bias current of a first magnitude (I) into an emitter of a PNP first input transistor (Q57) and sinks a ... | 05/05/2009 |
| 7411455 | High output current buffer A bipolar high output current buffer is disclosed using a negative feedback current mirror to supply the base drive to an output transistor. Small quiescent currents are used wherein the buffer demonstrates low quiescent power dissipation. The current mirror supplie... | 08/12/2008 |
| 7405622 | Operational amplifier with less offset A differential amplifier includes an input stage circuit including a first differential pair and a second differential pair which are complementary to each other; a first current mirror circuit connected with the first differential pair and configured to function as... | 07/29/2008 |
| 7405624 | Class AB source follower Various source follower circuits and methods for implementing such are disclosed. As one example, a class AB source follower circuit is disclosed that includes a source follower circuit that is actively biased. The dynamic biasing allows the source follower circuit ... | 07/29/2008 |
| 7403072 | Integrated circuit devices having a control circuit for biasing an amplifier output stage and methods of operating the same An integrated circuit device includes an amplifier circuit that generates an output voltage. A bias control circuit is configured to generate a bias control voltage or the output voltage at an output thereof based on a state of a control signal. An output stage driv... | 07/22/2008 |
| 7394316 | High speed, high current gain voltage buffer and method An amplifying circuit which may be useful in a diamond buffer amplifier or operational amplifier includes an input transistor including an emitter, a collector, and a base coupled to receive an input voltage. An adjustable current source circuit is coupled between a... | 07/01/2008 |
| 7372333 | Monolithic supply-modulated RF power amplifier and DC-DC power converter IC Embodiments of RF power amplifiers are disclosed that include switched-mode power amplifiers supplied by synchronous buck DC-DC converters. The switched-mode power amplifiers can be used to amplify a limited form of an RF input signal and the supply to the switched-... | 05/13/2008 |
| 7362176 | High efficiency linear amplifier A linear amplifier is configured with a current-feedback amplifier followed by a voltage-feedback amplifier to drive a totem-pole output stage. The output stage includes a series arrangement of an npn transistor and a pnp transistor with their emitters coupled in se... | 04/22/2008 |
| 7348850 | Electronic circuit for amplification of a bipolar signal Consistent with an example embodiment, there is an electronic circuit for amplification of bipolar symmetric current signals. The electronic circuit has a pair of complimentary current mirrors. Depending on the polarity of the bipolar current signal one or the curre... | 03/25/2008 |
| 7339453 | Differential mode inductor with a center tap A differential mode inductor includes a first inductor lead that receives a current. A first arm receives the current from the first inductor lead. A center tap receives the current from the first arm. A second arm receives the current from the center tap. The secon... | 03/04/2008 |
| 7327194 | Low voltage low power class A/B output stage A CMOS class A/B output stage provides the advantages of high speed operation, low supply voltage requirements, and low quiescent current draw, resulting from the use of subthreshold biasing of the output driver transistors. The architecture of the output stage make... | 02/05/2008 |
| 7319620 | Input and output buffers having symmetrical operating characteristics and immunity from voltage variations A pair of self-biased differential amplifiers having a non-symmetrical topology are combined to provide a self-biased differential amplifier having a symmetrical topology. Each of the combined differential amplifiers includes a pair of transistors coupled to each ot... | 01/15/2008 |
| 7304538 | Accurate quiescent current control scheme in floating controlled class AB amplifier Provided is an amplifier including a system for controlling output stage quiescent current. The amplifier includes a driving stage including first pmos and nmos transistors coupled together, and an output stage connected to the driving stage. The output stage includ... | 12/04/2007 |
| 7298211 | Power amplifying apparatus A push-pull amplifier includes a pair of transistors, wherein each of the transistors has a control terminal, a first terminal, and a second terminal. A current that flows between the first terminal and the second terminal is controlled in accordance with signals ap... | 11/20/2007 |
| 7271653 | Amplifier with a voltage-controlled quiescent current and output current An amplifier capable of controlling the magnitudes of quiescent and output current, using externally supplied voltages. The amplifier includes: an input circuit converting a voltage difference between input signals into a current; an output circuit outputting an out... | 09/18/2007 |
| 7262665 | Active bias circuit for low-noise amplifiers A low-noise amplifier with a first amplification circuit that includes a control terminal, a first terminal, and a second terminal that communicates with a first reference voltage. An impedance load that communicates with the first terminal and a feedback circuit th... | 08/28/2007 |
| 7253685 | Class AB amplifier having adjustable quiescent current and output current A class AB amplifier capable of easily controlling the amount of quiescent current and the amount of amplifier output current. The amplifier includes an input circuit that transform a voltage difference between input signals into a current; a current mirror includin... | 08/07/2007 |
| 7253680 | Amplifier system with current-mode servo feedback A system and method for compensating an amplifier apparatus for low frequency and/or DC components of an externally applied input signal as well as for any voltage offsets contributed by the amplifier circuitry. Band-limited servo feedback is applied to predetermine... | 08/07/2007 |
| 7236111 | Linearizing methods and structures for amplifiers Methods and structures are provided to enhance the linearity of amplifiers such as those which include a complementary common-collector amplifier stage. The methods and structures configure this stage so that each transistor of the stage drives an output port throug... | 06/26/2007 |
| 7224227 | Apparatus and method for correction of error caused by reverse saturation current mismatch A buffer circuit is arranged for offset cancellation between an input voltage and a buffered voltage. The buffer circuit includes two bias current sources, two p-type transistors, and two n-type transistors. Further, the base-emitter voltages of the two p-type trans... | 05/29/2007 |
| 7218175 | Dynamic feedback linearization An apparatus comprising an amplifier comprising at least one amplifier transistor, a threshold detection network and a bypass capacitor. The amplifier may be configured to generate an output signal at a collector in response to an input signal received at a base. Th... | 05/15/2007 |
| 7206155 | High-speed, low power preamplifier write driver A write driver circuit (38) uses a matching resistors (R0, R1) to match the impedance of the head (32) disposed between output nodes (OUTP, OUTN). Control circuitry (Q4, Q5, Q6, Q7, R2, R4, R6 | 04/17/2007 |
| 7202749 | AC coupling technique for improved noise performance and simple biasing A low noise amplifier (LNA), which utilizes an AC coupling technique that can internally bias diodes in such a way as to provide effective low noise amplification, is provided. The low noise amplifier includes an input to an amplifier circuit, and an AC coupling cap... | 04/10/2007 |
| 7199657 | Amplification gain stages having replica stages for DC bias control An amplification apparatus is provided that includes a plurality of gain stages including a first gain stage having first and second transistors and a second gain stage having third and fourth transistors. A plurality of replica stages may also be provided that incl... | 04/03/2007 |
