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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 8183919 | Power amplifier A power amplifier includes an inverter amplification section configured to amplify AC components and remove DC components from at least one input signal, an impedance matching section configured to match an impedance of a transmission path of the at least one input ... | 05/22/2012 |
| 8183918 | Circuitry and method for reducing second and third-order nonlinearities An electronic circuit comprises at least two transistors coupled in parallel, wherein the second transistor channel length is configured such that the threshold voltage of the second transistor is at a peak on a threshold voltage versus channel lengths curve arising... | 05/22/2012 |
| 8174317 | Fully-differential amplifier circuit A fully-differential amplifier circuit comprises a differential amplifier configured to differentially amplify first and second input signals serving as an input differential pair to generate a pair of first and second intermediate signals, first and second class AB... | 05/08/2012 |
| 8174318 | Apparatus and method for providing linear transconductance amplification Apparatus and methods are disclosed, such as those involving a transconductance amplifier. One such apparatus includes a transconductance amplifier comprising an input to receive an input voltage signal, and an output to provide an output current signal at least par... | 05/08/2012 |
| 8159301 | Differential amplifier with hysteresis An amplifier circuit having a differential input and an amplifier output is provided. In some examples, the amplifier circuit includes a first input stage having a first complementary transistor pair providing a first input and a first output, the first input being ... | 04/17/2012 |
| 8159300 | Signal conversion circuit and rail-to-rail circuit A signal conversion circuit 2 according to an embodiment of the present invention has a difference amplifier 10 and a source follower 20. The difference amplifier 10 has first and second resistors 11, 12 connected in series, third ... | 04/17/2012 |
| 8143946 | Current to voltage converter A current to voltage converter which includes a common gate transconductance element having at least one input and one output. The current to voltage converter further includes a common source transconductance element having at least one input and one output, where ... | 03/27/2012 |
| 8143947 | Semiconductor differential amplifier There is provided a circuit to make a bias for adjusting a threshold voltage of MOS devices available in a wide range, to extend the amplitude range of the input voltage range of a semiconductor differential amplifier from a power supply potential to a ground potent... | 03/27/2012 |
| 8130034 | Rail-to-rail amplifier A rail-to-rail amplifier includes an NMOS type amplification unit configured to perform an amplification operation on differential input signals in a domain in which DC levels of the differential input signals are higher than a first threshold value, a PMOS type fol... | 03/06/2012 |
| 8125273 | Apparatus and method for driving an LED Here, a driver for an light emitting diode (LED) is provided. Within this driver, several differential pairs of bipolar transistors are employed in an input stage and output stage along with a control loop. Collectively, these components operate together to drive th... | 02/28/2012 |
| 8125274 | Differential amplifier A differential amplifier including: 1st transistor that is connected between 1st power-supply terminal and 1st output terminal, and has a control terminal receiving one of the differential input signals; 2nd transistor that is connected between 2nd power-supply term... | 02/28/2012 |
| 8115549 | Amplifier circuit and radio receiver A feedback resistor is connected between an input terminal and an output terminal of an operational amplifier. A negative resistor is connected between an inverting input terminal and a non-inverting input terminal of the operational amplifier. ... | 02/14/2012 |
| 8115550 | Transmitter A transmitter for supplying a large current upon phase change of an output voltage is disclosed. The transmitter includes a first amplifying unit including a first amplifier including first NMOS and PMOS transistors connected by a common source thereof, and a second... | 02/14/2012 |
| 8098096 | Device and method for generating an output signal An embodiment provides a device for generating an output signal as a function of an input signal, wherein a plurality of circuit sections generate partial signals and the output signal is composed from the partial signals. ... | 01/17/2012 |
| 8089314 | Operational amplifier having improved slew rate A slew rate improved operational amplifier circuit is provided to improve the slew rates of an operational amplifier with minimal sacrifices in power dissipation and other operational amplifier parameters. To improve the slew rates of operational amplifiers, additio... | 01/03/2012 |
| 8081030 | Multi-mode amplifier An amplifier capable of operating in multiple modes may include (a) first and second voltage inputs and (b) first and second current outputs that have substantially the same amplitude and polarity. Preferably, the inputs and outputs of the amplifier will have high i... | 12/20/2011 |
| 8072269 | Amplifier Briefly, one or more embodiments of an amplifier, including example applications, are described. ... | 12/06/2011 |
| 8072268 | Operational amplifier An operational amplifier has an input stage that branches a first current according to first and second input signals. An output stage generates an output signal from a second current and one of the branch currents in the input stage. A first transistor supplies the... | 12/06/2011 |
| 8072267 | Phase margin modification in operational transconductance amplifiers The present disclosure relates to phase margin modification in operational transconductance amplifiers. ... | 12/06/2011 |
| 8067982 | Transconductance amplifier with improved linearity The invention relates to a transconductance amplifier, intended to supply current variations di when it receives voltage variations dv, with a desired conversion coefficient Gm called transconductance: Gm=di/dv. The amplifier comprises a PMOS transistor (MP | 11/29/2011 |
| 8063702 | High frequency receiver preamplifier with CMOS rail-to-rail capability A folded cascode receiver amplifier with constant gain has inputs coupled to PMOS and NMOS differential transistors pairs with scaled geometries. The transconductance of both PMOS and NMOS transistors is the same whether the common mode input voltage is low or high.... | 11/22/2011 |
| 8054132 | OP-amp circuit An OP-amp circuit includes a first circuit unit configured to generate an operating voltage in response to an enable signal, a second circuit unit configured to amplify a difference between respective voltages received through an inverting terminal and a non-inverti... | 11/08/2011 |
| 8030999 | Low voltage operational transconductance amplifier circuits Circuits (FIG. 1) that operate with power supplies (VDD) of less than 1 Volt are present. More particularly, circuits (FIG. 1) that operate with supply voltages (VDD) near or lower than the threshold voltage of the transistors (M1A, M1B) ... | 10/04/2011 |
| 8018281 | Method and device for performing offset cancellation in an amplifier using floating-gate transistors An operational amplifier including: a differential pair of transistors coupled to a pair of input signals; and a pair of floating-gate transistors coupled to the differential pair of transistors, wherein the pair of floating-gate transistors are operable for reducin... | 09/13/2011 |
| 8013679 | Operational amplifier An operational amplifier capable of suppressing power consumption and noise generation includes an offset modifier including a differential amplification circuit, and an offset memory for storing an offset voltage using a latch circuit. The differential amplificatio... | 09/06/2011 |
| 8004361 | Constant transconductance operational amplifier and method for operation An embodiment is a circuit comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a first switch, and a second switch. The first transistor, the second transistor, the third transistor, and the fourth transistor are all of a sam... | 08/23/2011 |
| 7994858 | Operational trans-conductance amplifier with output clamp circuit An operational trans-conductance amplifier circuit having a voltage clamp circuit. The clamp circuit utilizes low area and power overhead, has a sharp clamp characteristic, and little degradation in the small-signal DC gain at the “knee” of the clamp characteris... | 08/09/2011 |
| 7990216 | Cross-coupled low noise amplifier for cellular applications Cross-coupled low noise amplifier for cellular applications. A circuitry implementation that includes two pairs of metal oxide semiconductor field-effect transistors (MOSFETs) (either N-type of P-type) operates as an LNA, which can be used within any of a wide varie... | 08/02/2011 |
| 7982537 | Operational amplifier Disclosed herewith is a circuit system for improving a slew rate while reducing the power consumption in an operational amplifier that requires a comparatively high supply voltage (e.g., 5 V or upper) operation. The operational amplifier includes level shift circuit... | 07/19/2011 |
| 7978009 | Digital modulated RF power amplifier with impedance compensation circuit A digital modulated power amplifier unit includes a differential radio frequency (RF) amplifier circuit having differential output nodes, a digital modulation signal input and complimentary clock signal inputs. The differential RF amplifier circuit includes a first ... | 07/12/2011 |
| 7956686 | Differential amplifier with symmetric circuit topology A differential amplifier circuit is provided with a first input stage including a transistor pair of a first conductivity type, of which transistor pair receives differential input signals; a first output stage connected to the first input stage; a second input stag... | 06/07/2011 |
| 7948314 | Tunable linear operational transconductance amplifier A tunable, linear operational transconductance amplifier includes a differential voltage to current conversion unit adapted to generate first and second output signals at respective first and second output nodes responsive to first and second differential input sign... | 05/24/2011 |
| 7944298 | Low noise and low input capacitance differential MDS LNA A differential low noise amplifier (LNA) involves two main amplifying transistors biased in saturation, and two cancel transistors biased in sub-threshold. In one example, the gates of the cancel transistors are coupled to the drains of main transistors, in a symmet... | 05/17/2011 |
| 7944299 | Method for adjusting threshold voltage and circuit therefor A method and circuit for changing a threshold voltage of a transistor. The circuit includes a sense circuit coupled to a switching transistor, a circuit transistor and to one terminal of a resistor. The other terminal of the resistor is connected to a body contact. ... | 05/17/2011 |
| 7940121 | Operational amplifier and pipeline AD converter A differential voltage interconnect (W101a) electrically connects the gate electrode of a transistor to be used among differential transistors (T101a, T101a, . . . ) to an input node receiving an input voltage (Vinn), and a ... | 05/10/2011 |
| 7920024 | Apparatus and methods providing dynamic biasing of cascode transistors in class AB amplifiers An amplifier and method of fabricating and operating it are disclosed in which dynamically biased cascode transistors are provided in an output stage along with output transistors which are dynamically biased by differential control circuits to provide an output sig... | 04/05/2011 |
| 7911274 | Variable transconductance circuit The variable transconductance circuit includes: a voltage-current conversion circuit for outputting a current signal linear with an input voltage signal; first and second MOS transistors for converting the current signal received to a square-root compressed voltage ... | 03/22/2011 |
| 7898328 | Differential amplifier In a wireless communications system, it is important to realize a limiter operation by which a differential amplifier for amplifying a local signal may stably supply an output signal having a constant amplitude. However, when a signal handled by the system has a hig... | 03/01/2011 |
| 7889004 | Operational amplifiers with enhanced parameters Operational amplifier embodiments are provided to enhance amplifier parameters such as bandwidth, stability, and headroom. In an amplifier embodiment, transistor followers are arranged with first and second differential pairs to facilitate selective positioning of f... | 02/15/2011 |
| 7880544 | Differential amplifier and applications thereof A differential amplifier includes a first pair of differential amplifiers and a second pair of differential amplifiers. These first and second pairs of differential amplifiers are connected between first power rails and are arranged to receive a differential input s... | 02/01/2011 |
