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| Number | Title | Issue Date |
| 8089311 | Signal amplifier A signal amplifier including a transformer with a primary winding and a secondary winding, an oscillator circuit driven by an input signal establishing in the primary winding an oscillating signal amplified by the secondary, and a rectifier circuit responsive to the... | 01/03/2012 |
| 8058926 | Amplifier input switch configuration with improved PSRR A switch including a first transistor including a first main terminal connected to a first switch node, a second main terminal connected to a second switch node and a control terminal, the second switch node being connected to a first clean voltage supply, and first... | 11/15/2011 |
| 8030993 | Gain control circuit and method of gain control The present invention relates to a gain control circuit, which detects an output signal of a front-end circuit to produce a detection signal. An operation unit performs an accumulation operation to the detection signal and thereby produces an operation signal. In ad... | 10/04/2011 |
| 7414441 | Output buffer circuit An output buffer circuit includes an input stage of which one end receives an input voltage and the other end receives an output voltage; a class AB output stage that increases a current flowing in the output stage when the difference between the input and output vo... | 08/19/2008 |
| 7411459 | Current mode transconductor tuning device A transconductor tuning device tuning a transconductance using a current. The transconductor tuning device includes a tuning section that applies a tuning current and a reference voltage to a transconductor converting an input voltage signal into a current signal an... | 08/12/2008 |
| 7394857 | Flexible versatile low-cost wireline transmit driver A versatile, programmable, low-cost transmit line driver is provided. The line driver includes a digital-to-analog converter that receives a digital input and provides an analog output. The line driver is reconfigurable between the voltage mode of operation. ... | 07/01/2008 |
| 7358819 | Reduced-size sensor circuit The present invention relates to circuits configured for implementation in sensors, sensors employing such circuits, and methods of operating and manufacturing such sensors and/or circuits. In at least some embodiments, the circuit includes a capacitor having a firs... | 04/15/2008 |
| 7339436 | Ultra broad-band low noise amplifier utilizing dual feedback technique This invention relates to a low noise amplifier, used in radio frequency integrated circuit design, especially low noise amplifiers for ultra broad-band wireless communication, comprising at least a transistor of the core circuit of a low noise amplifier structure, ... | 03/04/2008 |
| 7323827 | Ripple reduction method for electronic ballasts A rectifying circuit converts an alternating current (AC) voltage to a first direct current (DC) voltage. A filter filters the rectified first DC voltage and outputs the filtered first DC voltage which includes an alternating current (AC) voltage component or ripple... | 01/29/2008 |
| 7319310 | Regulated power supply unit An improved power supply unit includes a DC power source having a positive terminal and a negative terminal, and a voltage regulating circuit that includes a plurality of elements coupled in series between the positive and negative terminals of the DC power source t... | 01/15/2008 |
| 7313057 | Method for adjusting a control parameter and optical disc drive server system using the same A method for adjusting a control parameter is adopted in an optical disc drive server system, which has a compensator, a control loop and a parameter regulator. The control loop includes an optical pickup and outputs a first tracking error signal/focus error signal.... | 12/25/2007 |
| 7304540 | Source follower and current feedback circuit thereof A current feedback circuit is used in the source follower. The source follower includes a first MOS transistor and a current mirror. The first MOS transistor has a gate receiving an inputting signal and a source outputting an output signal. A drain current flows thr... | 12/04/2007 |
| 7298207 | Automatic gain control for a multi-stage gain system Systems and methods are disclosed for providing automatic gain control of a multi-stage system. A method can include defining at least one parameter that is adapted to at least one of maximize hardware capacity of each of a plurality of gain stages and mitigate part... | 11/20/2007 |
| 7298195 | Methods and apparatus for improved phase switching and linearity in an analog phase interpolator Methods and apparatus are provided for improving phase switching and linearity in an analog phase interpolator. A phase interpolator in accordance with the present invention comprises (i) a plurality of tail current sources that are activated for substantially all t... | 11/20/2007 |
| 7286014 | Variable gain device A variable gain device having higher linearity and wider gain range is provided. The variable gain device includes a transduction unit for generating an output current, a control unit for adjusting the current gain of the gain amplifying unit according to a gain con... | 10/23/2007 |
| 7282990 | Operational amplifier for output buffer and signal processing circuit using the same An operational amplifier includes: a differential amplifier for differentially amplifying first and second differential input signals to generate first and second output signals through first and second nodes; a driver for driving an output node in response to the s... | 10/16/2007 |
| 7282965 | Signal detection circuit capable of automatically adjusting threshold value The signal detection circuit of the present invention includes: a comparison section for comparing the absolute value of a voltage of an input differential signal with a threshold voltage corresponding to a first detection level adjustment signal to detect presence/... | 10/16/2007 |
| 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 |
| 7274252 | Power amplification circuit and operational amplifier incorporating said circuit A power amplifier circuit comprising first and second modules, a current source and a push-pull module. The push-pull module comprises two intermediate transistors and two output transistors. The circuit also comprises third and fourth modules, operating in current ... | 09/25/2007 |
| 7271646 | Loop powered process control instrument power supply A loop powered process instrument comprises a control circuit measuring a process variable and developing a control signal representing the process variable. An output circuit for connection to a two-wire process loop controls current on the loop in accordance with ... | 09/18/2007 |
| 7262693 | Process field device with radio frequency communication A field device for use in an industrial process control or monitoring system includes terminals configured to connect to a two-wire process control loop. The loop carries data and provides power to the field device. RF circuitry in the field device is provided for r... | 08/28/2007 |
| 7259630 | Elimination of peak clipping and improved efficiency for RF power amplifiers with a predistorter A predistorer configured for use with an RF power amplifier having an input loop configured to be coupled to the input of the RF power amplifier and peak control circuit. Such an input loop includes a look-up table containing predistortion values to be applied to an... | 08/21/2007 |
| 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 |
| 7245189 | High linearity digital variable gain amplifier Variable gain amplifiers offering high frequency response with improved linearity and reduced power dissipation are provided. An amplifier is disclosed that is constructed from a one-stage topology with multiple signal paths and compensation networks for improved li... | 07/17/2007 |
| 7239195 | Active power supply rejection using negative current generation loop feedback A negative current generator for an amplifier circuit including a shunt transistor, first and second mirror transistors, a current bias device, and an amplifier. The amplifier circuit includes a current source transistor having current terminals coupled between a su... | 07/03/2007 |
| 7227420 | Transimpedance amplifier with a high gain/bandwidth product for conversion of a DAC output current The two output currents (INP, IN) which are produced by a current source digital/analog converter (DAC) are supplied to the two halves of a symmetrical transimpedance amplifier. The input current (INP, IN) is supplied to a first stage, which is formed by a first tra... | 06/05/2007 |
| 7223957 | Sensor including circuitry for recovering time-varying information and removing DC offsets An amplification circuit for implementation in sensors such as photodetectors and other devices, and related method of amplification, are disclosed. In some embodiments, the amplification circuit includes a first amplifier that receives an input signal at least indi... | 05/29/2007 |
| 7215160 | Switched operation amplifier A switched operation amplifier including a biased circuit, an amplifier circuit, and a buffer circuit is provided. The biased circuit is to provide a first, a second, and a third biased signals by means of an input signal and a reference current source. The amplifie... | 05/08/2007 |
| 7202645 | Regulated power supply unit An improved power supply unit includes a DC power source having a positive terminal and a negative terminal, and a voltage regulating circuit that includes a plurality of elements coupled in series between the positive and negative terminals of the DC power source t... | 04/10/2007 |
| 7199652 | Amplifier; and transmitter and communication device incorporating the same The present invention provides an amplifier for amplifying a high-frequency signal and outputting an amplified signal. The amplifier includes: an amplification element which is a bipolar transistor or a field-effect transistor; and an inductor connected between a ba... | 04/03/2007 |
| 7200186 | Methods and apparatus for reducing power usage of a transmitter and receiver coupled via a differential serial data link Methods and apparatus are disclosed for using in-band signal(s) over a differential serial data link to reduce power usage of a transmitter and receiver coupled by the link. ... | 04/03/2007 |
| 7196577 | Amplifier with capacitor selection A selectable-gain amplifier selectively couples different capacitors and feedback networks to a gain stage to provide operating characteristics that may include constant bandwidth operation. An interpolated VGA includes pairs of gm cells with cross-connected outputs... | 03/27/2007 |
| 7193448 | Wide dynamic range operational amplifier An operational amplifier has a bias circuit, a differential amplifier, an output stage, and a feed forward circuit. The bias circuit provides a reference. The differential amplifier is coupled to a pair of input terminals and provides a differential output based on ... | 03/20/2007 |
| 7187158 | Process device with switching power supply A process field device for coupling to a two wire process control loop includes a field device circuitry and a switching regulator to power the circuitry. A series regulator provides a regulated supply voltage to the switching regulator. A noise filter reduces the a... | 03/06/2007 |
| 7187236 | Rail-to-rail differential input amplification stage with main and surrogate differential pairs An operational amplifier input stage provides a symmetrical rail-to-rail input common-mode voltage without turning off either pair of complementary differential input transistors. Secondary, or surrogate, transistor pairs assume the function of the complementary dif... | 03/06/2007 |
| 7184739 | Quadrature mixer circuits and mobile terminal using the same Because there are different voltages at two current output terminals of a current divider, the voltages at the current input terminals of two current switch circuits are not affected mutually even with a large amplitude of local signals. Accordingly, the performance... | 02/27/2007 |
| 7180933 | Squelch circuitry for high speed high frequency operation A squelch circuit for operating at high speed and at high frequencies includes a squelch input unit, a low swing pre-amplifier and a sampling and decision circuit. The squelch input unit pre-processes the positive and negative signals of an input signal to generate ... | 02/20/2007 |
| 7176755 | Transistor-based interface circuitry Among the embodiments of the present invention is an apparatus that includes a transistor, a servo device, and a current source. The servo device is operable to provide a common base mode of operation of the transistor by maintaining an approximately constant voltag... | 02/13/2007 |
| 7176910 | Driving circuit for display device A driving circuit for driving a capacitive load promptly to a target voltage is to have a broad dynamic range and achieve a high accuracy output and saving in the surface area with low power dissipation. A first period and a second period are provided in one data dr... | 02/13/2007 |
| 7173490 | Apparatus and method for increasing a slew rate of an operational amplifier An apparatus and method for increasing a slew rate of an operational amplifier are provided. It only requires an operational amplifier, a monitoring control device, a push-pull output device, and a second input current source pair. It uses a monitoring control devic... | 02/06/2007 |
