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| Number | Title | Issue Date |
| 7872534 | Image signal amplifying circuit and amplifying semiconductor integrated circuit An image signal amplifying circuit comprises: an amplifier circuit for amplifying an image signal; an output capacitor and a resistance, both being serially connected between an output node of the amplifier circuit and an output terminal; and a second-order high pas... | 01/18/2011 |
| 7646251 | Radio frequency application circuit A radio frequency (RF) application circuit is provided. In the RF application circuit, a pair of bipolar junction transistors (BJTs), instead of N-channel metal-oxide-semiconductor (NMOS) transistors, is composed of a switch-block operated in a reversion saturation ... | 01/12/2010 |
| 7425872 | Radio frequency power amplifier A bias voltage is applied via a first resistance to the base of a first transistor, and a radio frequency signal is input via a first capacitor to the base of the first transistor. The bias voltage is applied via a second resistance to the base of a second transisto... | 09/16/2008 |
| 7423490 | Wideband high frequency chokes An n-stage RF choke comprises a series connection of two or more inductors connected in series between a source and a load. The inductor closest to the source has the largest inductance and the inductance closest to the load has the smallest inductance. The inductan... | 09/09/2008 |
| 7411458 | Method and apparatus for controlling an output voltage in a power amplifier Power amplifier (PA) apparatus that includes: a PA device operating at a fundamental frequency and having a maximum operating frequency that is higher than the fundamental frequency, an output current having a fundamental component at the fundamental frequency and a... | 08/12/2008 |
| 7391268 | Power amplifying device comprising a stabilizing circuit A power amplifying device includes a stabilizing circuit between an input terminal and an amplifier. The stabilizing circuit has a first line, a second line, and a third line. The first line is connected to the ground. The length of the first line is equal to or lon... | 06/24/2008 |
| 7391256 | System and method for DC correction in wireless receivers The present disclosure relates generally to systems and methods for direct current (DC) correction in wireless devices. In one example, a method includes setting a cutoff frequency of a filter at a first frequency, where a signal entering the filter is attenuated ba... | 06/24/2008 |
| 7355481 | Amplification circuit and control method of amplification circuit An amplification circuit connected with a lowpass filter, which reduces the time required for compensating the amplification characteristic and starting up at turning on the power supply, and a control method thereof are provided. An amplification circuit 10,... | 04/08/2008 |
| 7352237 | Radio frequency power amplifier and corresponding method A radio frequency power amplifier and corresponding methods are arranged and configured to drive or provide a radio frequency signal to a resonant load. The amplifier includes a radio frequency switching stage with an output that is coupled to a resonant circuit and... | 04/01/2008 |
| 7301392 | Tunable resonator for use in active-RC continuous-time filters An integrated circuit (IC) resonator in which resonator parameters potentially affected by IC fabrication processes are correctable after fabrication. Resonance frequency tuning is effected by forming each feedback capacitor in a pair of integrator circuits to inclu... | 11/27/2007 |
| 7269193 | Semiconductor laser driving circuit and image recording apparatus A semiconductor laser driving circuit for driving a semiconductor laser as an exposure light source is used in an image recording apparatus for recording an image using a light beam from the laser. The light beam emitted from the laser is subjected to pulse modulati... | 09/11/2007 |
| 7266388 | Transmitting circuit and communication terminal unit therewith When a signal of GSM 900 frequency band is transmitted, a bias voltage setting circuit sets an optimum bias voltage for the GSM 900 frequency band to a first stage amplifier and a second stage amplifier. The transmission signal is amplified by the two amplifiers. A ... | 09/04/2007 |
| 7260375 | Frequency agile RF circuit A frequency agile sequential amplifier circuit that includes first and second RF amplifiers coupled by a SAW delay line, a double balanced mixer coupling the first RF amplifier to the SAW delay line, the output of the first RF amplifier providing a signal as a first... | 08/21/2007 |
| 7245186 | Bandpass amplifier The present invention discloses a bandpass amplifier having gain and bandpass performance. The bandpass amplifier includes an input match unit for matching the gain of the amplifier and having a first filter response; a first bias unit electrically connected to the ... | 07/17/2007 |
| 7215221 | Harmonic termination circuit for medium bandwidth microwave power amplifiers A compact amplifier output bias circuit is used as a broadband harmonic termination. The bias circuit is adapted as a harmonic termination circuit to produce an effective low impedance or act as a load at the signal harmonic frequencies while having the capability o... | 05/08/2007 |
| 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 |
| 7202734 | Electronically tuned power amplifier A circuit and method for electronically tuning an RF power amplifier. The output filter includes at least one electronically variable reactance. The electronically tuned power amplifier may be tuned rapidly to a selected frequency, to a selected impedance, or to pro... | 04/10/2007 |
| 7193477 | Concurrent triple-band gain amplifier for multi-standard coexist communications The present invention discloses a gain amplifier, capable of concurrently operating at three different frequency bands. The gain amplifier comprises an amplification stage for amplifying a signal applied to an input of the amplifier and a triple-band resonance load ... | 03/20/2007 |
| 7176769 | Harmonic termination circuit for medium bandwidth microwave power amplifiers A compact amplifier output bias circuit is used as a broadband harmonic termination. The bias circuit is adapted as a harmonic termination circuit to produce an effective low impedance at the signal harmonic frequencies while having the capability of supplying DC po... | 02/13/2007 |
| 7161434 | Amplifier An amplifier comprising a field effect transistor, a terminating network comprising inductors connected in series separated by capacitors connected in parallel, a filter and a load, wherein the values of the capacitors and inductors are arranged to present open circ... | 01/09/2007 |
| 7138872 | Power amplifier device The power amplifier device comprises one or more transistors (16) with an output electrode and on top of that a thin-film capacitor. The capacitor comprises a first conductive layer (18), that is also the output terminal of the transistor. It further c... | 11/21/2006 |
| 7126344 | Diagnostic device for an antenna A diagnostic device for an antenna includes a coil (20) or the like connected on the one hand to a reference potential and on the other hand to the output of an amplifier (12), including two condensers (C2, C3) mounted in series, a first ... | 10/24/2006 |
| 7126308 | Interface circuit with power converter with interface circuit and electric vehicle with power converter In order to provide an interface circuit, a power converter using the same and an electric vehicle using the same, wherein this interface circuit ensures improved control reliability without employing a photo-coupler, an interface circuit 100A transfers contr... | 10/24/2006 |
| 7102447 | XO-buffer robust to interference Disclosed are methods and circuit configurations for reference frequency signal distribution circuitry that suppress unwanted spurious components introduced by way of RF signal leakage. The methods and circuitry may include relocating components of a buffer along a ... | 09/05/2006 |
| 7064611 | IRF amplifier A single-power-supply Idss-bias RF amplifier is disclosed, which is composed by the first and second stages Amplifiers. The two stages have the same circuit topology except matching circuits. The source terminal of amplifier is grounded directly to reduce a parasiti... | 06/20/2006 |
| 7042294 | Power amplifier system A power amplifier comprising input means for receiving signals at a plurality of different frequencies; a power transistor for amplifying received signals; first circuitry connected at one end to said power transistor and at another end to a relatively low frequency... | 05/09/2006 |
| 7038332 | Power discriminating systems The present invention relates to a control system for selectively supplying electrical power in a remote environment. The system comprises a plurality of electrical circuits, each designed to operate over a unique frequency passband. Power transmitted within the fre... | 05/02/2006 |
| 7038547 | Amplifier circuit An amplifier circuit has an amplifier, a D.C. bias circuit, and an output signal path. The amplifier amplifies a modulated signal that has a carrier frequency. The D.C. bias circuit has a decoupling capacitor that is coupled to a transmission line having a length eq... | 05/02/2006 |
| 7035617 | High power block upconverter A system and method for high power block upconversion having a stand-alone and surface-mountable component is provided. The HP-BUC system of the invention provides a “drop-in” component capable of mixing a local oscillator signal with an IF signal to produce an ... | 04/25/2006 |
| 7034611 | Multistage common mode feedback for improved linearity line drivers A technique to attenuate even-order harmonics of an output stage of a multistage nested Miller compensation circuit. In one example embodiment, this is accomplished by using a low-bandwidth low-swing amplifier in the common mode feedback loop to improve the even-ord... | 04/25/2006 |
| 7034620 | RF power amplifier employing bias circuit topologies for minimization of RF amplifier memory effects An RF power amplifier having reduced memory effects is disclosed. This is achieved by a novel design of the DC supply feed network to achieve low impedance across video frequencies, whilst maintaining the correct RF output matching. One or more transmission zeros ar... | 04/25/2006 |
| 7019594 | Method and apparatus for analyzing performance of a multi-stage radio frequency amplifier A method and an apparatus for analyzing performance of a multi-stage radio frequency amplifier are described. The method simplifies the multi-stage radio frequency amplifier into equivalent input parts, output parts and mid-stage parts. The mid-stage parts are tempo... | 03/28/2006 |
| 6992545 | GPS low noise amplifier unit, duplex filter unit and GPS-cellular hand-set A GPS-cellular hand-set includes a receive antenna; a separate transmit antenna; a power amplifier; a duplex filter unit having an input connected to the receive antenna, a cellular output, and a GPS output; a cellular unit having a receive input and a transmit outp... | 01/31/2006 |
| 6982603 | Radio-frequency power amplification circuit having stabilization circuit A radio-frequency power amplification circuit includes a transistor and a stablization circuit that is provided upstream of the transistor. The stabilization circuit includes a series resistor, a first end of which is connected to the transistor and a second end of ... | 01/03/2006 |
| 6954106 | FET band amplifier An FET band amplifier for providing a high gain. An FET band amplifier 5 included in an AM receiver comprises amplifiers 11 to 15 e.g. at five stages and a BPF 16 inserted halfway in their connection. Each of the amplifiers 11 to | 10/11/2005 |
| 6946924 | Low noise voltage controlled oscillator A voltage controlled oscillator, comprising a pair of transistors connected to a tank circuit, said tank circuit including a plurality of tuning diodes connected in parallel with an inductor, said tuning diodes having cathodes connected to a common connection. ... | 09/20/2005 |
| 6933780 | Predistortion circuit and power amplifier A predistortion circuit has an input terminal for inputting a predetermined signal; a nonlinear device directly or indirectly connected to the input terminal; a bias supply circuit for applying a v... | 08/23/2005 |
| 6933782 | Degenerative inductor-based gain equalization Described are high-speed parallel-to-serial converters. The converters include data combiners with differential current-steering circuits that respond to parallel data bits by producing complementary current signals representing a differential, serialized version of... | 08/23/2005 |
| 6924715 | Band reject filters Acoustic resonators such as surface acoustic wave (SAW) devices and thin film bulk acoustic resonators (FBAR) can be configured to produce a band reject filter. Such a filter overcomes the insertion loss and power handling limitations of conventional band pass confi... | 08/02/2005 |
| 6922108 | Active balun circuit for single-ended to differential RF signal conversion with enhanced common-mode rejection An active balun circuit is provided for single-ended to differential RF signal conversion with enhanced common-mode rejection which suppresses common mode signal and which achieves phase and amplitude balance without sophisticated tuning or compensation methods. The... | 07/26/2005 |
