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| Number | Title | Issue Date |
| 8115553 | High linearity, low noise, wide bandwidth amplifier/buffer A radio frequency wide band amplifier having a noise that does not exceed a threshold value, and a linearity better than a threshold value. The radio frequency wide band amplifier architecture includes a first stage amplifier and a second stage amplifier. The second... | 02/14/2012 |
| 8102214 | Controlled-gain wideband feedback low noise amplifier Provided is controlled-gain wideband feedback low-noise amplifier. The controlled-gain wideband feedback low-noise amplifier includes: a feedback amplifier configured to isolate an input signal and an output signal obtained by amplifying the input signal, feed back ... | 01/24/2012 |
| 7633344 | Low noise amplifier and differential amplifier In a double-loop negative feedback low noise amplifier having double negative feedback paths by a feedback transformer and a feedback resistor added to a cascode amplifier comprising transistors and a resistor, a phase compensation circuit comprising a capacitor and... | 12/15/2009 |
| 7567127 | Automatic-gain control circuit An automatic-gain control circuit includes a variable-gain amplifier, a peak-detecting circuit, and an adjustable charge/discharge circuit. The variable-gain amplifier receives an input signal and adjusts the input signal based on a gain-factor control signal for ge... | 07/28/2009 |
| 7535303 | Active LC filter damping circuit with galvanic isolation A method and apparatus for providing electrical power through two terminals to a load wherein a portion of a LC filter circuit is connectable to each of the terminals. A feedback circuit having a sense capacitor is operably couplable to both portions of the LC outpu... | 05/19/2009 |
| 7444123 | Transmitter and mobile communication terminal using the same With a dual mode transmitter capable of handling two modulation methods for nonconstant amplitude modulation and constant amplitude modulation, respectively, speed-up of transition between modes is implemented. In a mode handling the constant amplitude modulation, f... | 10/28/2008 |
| 7429891 | Method and system for low noise amplifier (LNA) gain adjustment through narrowband received signal strength indicator (NRSSI) Methods and systems for processing a plurality of signals are disclosed herein. Aspects of the method may comprise amplifying an input signal. The amplified input signal may be bandpass filtered. Amplification of the input signal may be adjusted based on only narrow... | 09/30/2008 |
| 7385170 | Ambient light suppression circuit for photodiode receiver applications An optical receiver circuit that effectively suppresses ambient light. A photodiode receives both desired higher frequency modulated optical signals, as well as the lower frequency or even DC ambient light optical signals. The optical receiver circuit includes a tra... | 06/10/2008 |
| 7336935 | Dynamic power control circuit of wireless communication device The present invention is to provide a dynamic power control circuit for a wireless communication device, which comprises a power detector, a comparator, a low pass filter and an adder disposed between a radio frequency auto-gain control circuit and an antenna thereo... | 02/26/2008 |
| 7248193 | Delta-sigma modulator and its application to switching amplification circuit A loop delay control circuit is provided between a comparator and a power switch stage. When the amplitude of an input signal is especially high, the loop delay control circuit secures an oscillation threshold value by setting a delay amount at a low value. On the o... | 07/24/2007 |
| 7199666 | Construction and use of preamps having discrete gain states In one embodiment, the linear gain region of a preamp is widened by performing the following actions within the preamp: converting a received input current to a first voltage; in accordance with one of a plurality of discrete gain states, amplifying the first voltag... | 04/03/2007 |
| 7190218 | Differential or single-ended amplifier and relative control method The method controls, in a feedback mode, a common collector or common drain amplifier, biased with a voltage applied on a bias node produced by a biasing circuit that generates a temperature compensated reference voltage from which the bias voltage applied on the bi... | 03/13/2007 |
| 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 |
| 7170345 | Predistorter To provide a predistorter compensating for distortion generated at an amplifier by inputting a signal to be inputted to the amplifier constituting an object of compensating for the distortion and previously providing the distortion to the input signal. Amplifier rep... | 01/30/2007 |
| 7155185 | Apparatus and methods for eliminating DC offset in a wireless communication device Apparatus and methods for eliminating DC offset in a wireless communication device operable on a continuous basis or on a sampled basis. In a receive channel, the output of a forward variable gain amplifier is fed back to an RC circuit to charge the capacitor (C) to... | 12/26/2006 |
| 7151412 | Sliding cascode circuit Described techniques extend (e.g., by a factor of 2) the dynamic range of voltage swing for amplifiers and other integrated circuits (e.g., buffers) that are fabricated using lower voltage rated semiconductor processes. Such processes include, for instance, thin gat... | 12/19/2006 |
| 7151408 | Method for generating a radio-frequency alternating voltage and an associated radio-frequency power amplifier A radio-frequency power amplifier system operated in a resonant mode of operation includes a uniform power source, a switching element adapted for applying power on and off at a basic frequency from the uniform power source to a resonant circuit connected to a varyi... | 12/19/2006 |
| 7148745 | Sleep mode recovery One embodiment in accordance with the invention is a circuit. For example, the circuit can include a first stage amplifier coupled to receive a reference voltage. The circuit can also include a second stage amplifier coupled with an output of the circuit and the fir... | 12/12/2006 |
| 7148749 | Closed loop power control with high dynamic range A method (500) and apparatus (300, 400, 601) facilitate closed loop transmit power control in a power control loop at and during a transition from one transmit power level to another transmit power level in a transmitter. The apparatus includes a refer... | 12/12/2006 |
| 7142058 | On-chip temperature compensation circuit for an electronic device A general purpose Darlington pair amplifier circuit, configured in accordance with a preferred embodiment of the invention, utilizes GaAs heterojunction bipolar transistor technology. The amplifier circuit incorporates a temperature compensation circuit at the input... | 11/28/2006 |
| 7138869 | Amplifier circuit An amplifier circuit having a high time constant. An operational amplifier includes a non-converting input terminal coupled to a ground, a converting input terminal and an output terminal. A first resistor network including at least one stage is coupled between the ... | 11/21/2006 |
| 7109786 | Biquad notch filter A biquad notch filter includes a first stage having first and second admittances of a first type connected between an input terminal and the control terminal of a transistor, a first current source connected between a first supply terminal and a first terminal of th... | 09/19/2006 |
| 7106806 | Reducing distortion of signals A predistorter (26) comprises an array (44) of band pass filters (46 to 52) which divide an input signal into components. Each of the components is manipulated using coefficients retrieved from respective look-up tables (54 to 6... | 09/12/2006 |
| 7091790 | Power amplifier (PA) efficiency with low current DC to DC converter A novel method and apparatus is disclosed for reducing power dissipation of RF power amplifiers when a reduced output power level is required. The mechanism has the specific purpose of optimizing the collector terminal voltage on portions of the amplifier's RF chain... | 08/15/2006 |
| 7078966 | Power amplifier saturation detection and operation at maximum power Power amplifier apparatus comprising a power amplifier (1) having a signal output, and a power control feedback loop (3, 4, 5) for controlling the output signal power relative to a first power target signal (8). A saturation control loop (6, ... | 07/18/2006 |
| 7068098 | Slew rate enhancement circuit An operational amplifier (op-amp) (200, 800, 900) having at least a first stage and a second stage has a feedback path (825) from the output to the input of a second stage, the feedback path includes a first capacitor (801) and a second capacito... | 06/27/2006 |
| 7042288 | Charge amplifier for piezoelectric pressure sensor An object of the present invention is to provide a charge amplifier which can be operated at low cost so that electric charge generated in a piezoelectric pressure sensor having one end grounded is converted into a voltage signal. In the charge amplifier (... | 05/09/2006 |
| 7030701 | Transimpedance amplification apparatus with source follower structure A transimpedance amplification apparatus includes a signal source for generating a current signal, a source follower stage, a common source stage and a shunt feedback resistor. The source follower stage having a source follower structure receives the current signal ... | 04/18/2006 |
| 7004016 | Probe system for ultrasonic processing tank The invention provides systems, methods and apparatus for processing delicate parts within a process tank such as an ultrasonic tank. Typically, one or more transducers connect to the tank and respond to drive signals from a generator to produce ultrasound within pr... | 02/28/2006 |
| 6998913 | Method and apparatus for linear low-frequency feedback in monolithic low-noise charge amplifiers A charge amplifier includes an amplifier, feedback circuit, and cancellation circuit. The feedback circuit includes a capacitor, inverter, and current mirror. The capacitor is coupled across the signal amplifier, the inverter is coupled to the output of the signal a... | 02/14/2006 |
| 6998910 | Amplifier using delta-sigma modulation An amplifier and a driver circuit therefor are presented for driving a load according to a system analog input. The amplifier comprises a passive delta-sigma modulator with a passive filter providing a first filtered signal according to a passive filter input and ac... | 02/14/2006 |
| 6995609 | Switching circuit and digital power amplifier To provide a switching circuit and a digital power amplifier capable of supplying much power to a load, as compared with a conventional circuit. A switching circuit of the present invention comprises a plurality of switching circuit units, in which first to f... | 02/07/2006 |
| 6995610 | Amplifier and radio frequency tuner An LNA for use as an input stage of a radio frequency tuner comprises an inverting amplifier stage and a transconductance stage. The amplifier stage has an input connected via an input resistance to an input of the amplifier and via a feedback resistance to an outpu... | 02/07/2006 |
| 6965270 | Regulated cascode amplifier with controlled saturation Described are regulated cascode amplifiers with improved low-voltage performance. The improved amplifier is similar to conventional regulated cascode amplifiers, including a cascode circuit and a feedback amplifier. The cascode circuit conventionally includes two ou... | 11/15/2005 |
| 6949977 | Circuit arrangement having a transimpedance amplifier connected to a current limiter circuit A circuit arrangement is provided which has the advantage of limiting the magnitude of the current to a transimpedance amplifier (TIA) circuit or a current to voltage converter during an overdrive condition, thereby preventing an amplifier of the TIA circuit from no... | 09/27/2005 |
| 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 |
| 6906595 | Variable gain current feedback amplifier An apparatus comprising an amplifier, a first resistor and a second resistor. The amplifier (i) comprises a first transistor and a second transistor and (ii) may be configured to generate an output signal in response to an input signal. The first resistor may be con... | 06/14/2005 |
| 6903605 | Offset cancellation techniques that utilize one of a plurality of offset cancellation sources Briefly, DC offset cancellation techniques that utilize one of multiple sources of a DC offset cancellation signal. The DC offset cancellation techniques may be used by a limiting amplifier. ... | 06/07/2005 |
| 6897731 | Method and circuit for overload recovery of an amplifier A method and circuit for providing a faster overload recovery time for an amplifier circuit is provided. An overload recovery circuit is configured to reduce and/or eliminate the slow tail voltage that may be caused by overloading a composite amplifier, and thus pro... | 05/24/2005 |
| 6842075 | Gain block with stable internal bias from low-voltage power supply A transistor bias circuit is provided that is capable of operating from a power supply voltage that is slightly higher than twice the base-emitter voltage of the transistor to be biased. The bias circuit includes a transistor connected in a current-mirror configurat... | 01/11/2005 |
