Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 8154348 | Amplifier circuit An amplifier circuit operating at a fundamental angular frequency •0, includes: a transistor which is represented by an equivalent circuit which includes: an equivalent output current source, a drain-source capacitor as a parallel parasitic capacitor to... | 04/10/2012 |
| 8149062 | Power amplifier circuitry having inductive networks A method and apparatus is provided for use in power amplifiers for reducing the peak voltage that transistors are subjected to. A power amplifier is provided with first and second switching devices and an inductor connected between the switching devices. The switchi... | 04/03/2012 |
| 8143951 | Broadband transistor bias network An amplifying circuit for use in, for example, broadband transceivers is described. A bias filter is connected between an amplifying transistor and a power supply to block a wide range of frequencies associated with amplified RF input signals from reaching the power... | 03/27/2012 |
| 8130043 | Multi-stage power amplifier with enhanced efficiency A multi-stage RF/Microwave power amplifier circuit is provided that is capable of operating efficiently at multiple output power levels. The amplifier comprises first and second amplifying stages, an output impedance matching network connected to the output of first... | 03/06/2012 |
| 8085096 | Apparatus and method for improved amplifier shunt-peak loading An amplification apparatus comprising first amplification circuitry having first shunt-peak circuitry and second amplification circuitry having second shunt-peak circuitry, wherein the amplification apparatus is arranged to provide an operational bandwidth over whic... | 12/27/2011 |
| 8072271 | Termination circuit based linear high efficiency radio frequency amplifier The present disclosure relates to RF power amplifier circuitry that may include a source termination circuit, a load termination circuit, or both used in an unconventional manner to shape amplitude-based amplitude modulation (AM-AM) distortion, amplitude-based phase... | 12/06/2011 |
| 8008976 | High-efficiency power amplification apparatus using saturated operation and method for controlling the same A saturated power amplification apparatus and a method for controlling the same are provided, in which a power device is provided, and an output matcher matches a load impedance of the power device. The load impedance is a complex impedance exceeding an impedance ge... | 08/30/2011 |
| 7982544 | Method and system for amplifying a signal using a transformer matched transistor A power amplifier includes a transistor, a transmission line transformer, and a capacitor. The transistor is operable to receive a signal and to generate an amplified signal. The transistor has a source, a drain, and a gate. The gate has a first impedance and is ope... | 07/19/2011 |
| 7956692 | Wide-band amplifier circuit with improved gain flatness There is provided a wide-band amplifier circuit with improved gain flatness. The wide-band amplifier circuit includes a first resonant load unit connected to an operating power terminal, providing a preset first load, and forming a preset first resonant point, a sec... | 06/07/2011 |
| 7898340 | Method and system for amplifying a signal using a transformer matched transistor A power amplifier includes a transistor, a transmission line transformer, and a capacitor. The transistor is operable to receive a signal and to generate an amplified signal. The transistor has a source, a drain, and a gate. The gate has a first impedance and is ope... | 03/01/2011 |
| 7868698 | Power amplifier with stabilising network A Stabilizing circuit (530) is connected to the output of a power amplifier transistor (502) in order to prevent the amplifier from being oscillating. The stabilizing circuit (530) comprises basically a resistor (536) connected in series ... | 01/11/2011 |
| 7868699 | Semiconductor integrated circuit device The present invention is to provide a technique which optimizes a gate resistor of a bias circuit to thereby make it possible to greatly improve a distortion characteristic of a power amplifier. A bias circuit used as for biasing the gate of a final-stage power tran... | 01/11/2011 |
| 7830211 | Input inductive network for sample and hold amplifiers in high speed data converters An input inductor or input inductive network is used to improve the performance of circuits working in discrete time domain, especially a sample and hold circuit. Input series inductors resonate with the capacitance at the input of the sample and hold at high freque... | 11/09/2010 |
| 7737787 | Impedance-mapping amplifier circuit with exclusively reactive negative feedback An amplifier circuit has a transistor element that has an input terminal, an output terminal) and a third terminal. An input signal to be amplified is supplied to the input terminal. The amplified input signal is emitted as an output signal at the output terminal. T... | 06/15/2010 |
| 7733187 | High frequency power amplifier A small, high performance high frequency power amplifier enables easily adjusting and switching the impedance. The high frequency power amplifier module includes a first semiconductor chip including one or a plurality of high frequency amplification devices, and a s... | 06/08/2010 |
| 7719364 | High frequency power amplifier A high frequency power amplifier includes an amplifying device for amplifying an input high frequency signal, a harmonic reflection circuit for reflecting a harmonic outputted from the amplifying device, and a harmonic generating circuit provided at an input termina... | 05/18/2010 |
| 7714662 | Multiband output impedance matching circuit having passive devices, amplifier including multiband input impedance matching circuit having passive devices, and amplifier including multiband input/output impedance matching circuit having passive devices Disclosed are a multiband output impedance matching circuit having passive devices, an amplifier including a multiband input impedance matching circuit having passive devices, and an amplifier including a multiband input/output impedance matching circuit having pass... | 05/11/2010 |
| 7675366 | Integrated amplifier circuit An integrated amplifier circuit includes an input, an output, a transistor with a transistor-input terminal, the transistor-input terminal being coupled to the input, and a transistor-output terminal. The transistor-output terminal is coupled to the output by means ... | 03/09/2010 |
| 7663444 | Amplifying circuit utilizing nonlinear gate capacitance for enhancing linearity and related method thereof An apparatus for amplifying an input signal is disclosed. The apparatus includes a first amplifying circuit and a first resonating circuit. The first amplifying circuit includes a first transistor having a first gate for receiving the input signal. The first amplify... | 02/16/2010 |
| 7642859 | Power amplifier A power amplifier includes an amplification circuit, an input stage matching circuit, and an output stage matching circuit. The amplification circuit amplifies an input signal in each frequency band by an active element common to the signals in plural types of frequ... | 01/05/2010 |
| 7612616 | Low-noise amplifier A low-noise amplifier is provided according to the present invention. The low-noise amplifier includes a first amplifier stage, a second amplifier stage, a third amplifier stage, an input matching network, inter-stage matching networks, and an output matching networ... | 11/03/2009 |
| 7609115 | Input circuitry for transistor power amplifier and method for designing such circuitry A circuit having: an input matching network; a transistor coupled to an output of the input matching network; and wherein the input matching network has a first input impedance when such input matching network is fed with an input signal having a relatively low powe... | 10/27/2009 |
| 7567128 | Power amplifier suppressing radiation of second harmonic over wide frequency band Two trap circuits different in frequencies at which short-circuit is established are provided in an output matching circuit. Out of the two trap circuits, the trap circuit higher in frequency at which short-circuit is established is arranged closer to a power amplif... | 07/28/2009 |
| 7564312 | Resonant amplifier A resonant amplifier is provided. A resonant inductor is connected in series between a source (emitter) of a common gate (base) transistor and an input point (i.e. output point of previous stage), and a resonant capacitor is connected between the input point and a g... | 07/21/2009 |
| 7554410 | Power amplifier A power amplifier amplifies an input signal having a fundamental frequency of which band width ranges between a first fundamental frequency F1 and a second fundamental frequency F2. The power amplifier includes a power amplifier transistor for amplifyi... | 06/30/2009 |
| 7541874 | High-frequency power amplifier device A high-frequency power amplifier device including: a power amplifier circuit which amplifies a high-frequency signal; an output matching circuit connected to an output side of the power amplifier circuit; and a high-frequency circuit connected to an output side of t... | 06/02/2009 |
| 7511577 | DC coupled microwave amplifier with adjustable offsets An output amplifier stage covers a flat frequency range of DC to microwave frequencies with provisions for independent control of input and output DC offset. The output amplifier stage includes a standard AC coupled microwave amplifier for high frequency performance... | 03/31/2009 |
| 7508269 | Stabilization circuit and multiband amplification circuit A stabilization circuit which includes serial stabilization blocks connected in series, with respect to a signal to be amplified, with an amplification element; parallel stabilization blocks connected in parallel with the amplification element, with respect to a sig... | 03/24/2009 |
| 7501897 | High-power amplifier A high-power amplifier changes matching conditions of an output matching circuit 5 connected between a final stage amplifying element 3 and an output terminal 8 in response to the output power of the amplifying element 3. Thus, the effici... | 03/10/2009 |
| 7468636 | Radio frequency power amplifier A radio frequency power amplifier 1 includes a former-stage transistor 2, a latter-stage transistor 3, and an inter-stage matching circuit 4 for connecting the former-stage transistor 2 and the latter-stage transistor 3. The... | 12/23/2008 |
| 7453321 | Amplifier arrangement and method of signal amplification An amplifier arrangement is proposed which has an amplifier with adjustable amplification having an output. An impedance transformer circuit is connected to the output. Said circuit is designed for transforming a high output impedance of the adjustable amplifier int... | 11/18/2008 |
| 7443236 | CDMA power amplifier design for low and high power modes An amplifier circuit responsive to a power mode signal improves efficiency at low power levels without compromising efficiency at high power levels. At low power levels, high impedance is presented with suitable adjustment in the phase of the signal. Also, providing... | 10/28/2008 |
| 7439802 | Unilateral feedback power amplifier and method for realizing the same A unilateral feedback power amplifier utilizes new feedback techniques and devices to make the amplified high-frequency signal unilateral, let the output power, power gain and impedance matching simultaneously accomplish the optimal values, and enhance the stability... | 10/21/2008 |
| 7436257 | High-efficiency mixed-mode power amplifier Provided is a power amplifier of a low-power consumption system that has linearity at a peak output power while increasing efficiency in a most frequently used range, and thereby enables a battery to last longer. The power amplifier includes an input impedance match... | 10/14/2008 |
| 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 |
| 7425873 | Radio frequency amplification apparatus An intermodulation distortion which is output from a final-stage amplifier 15 is fed back to an inter-stage matching circuit 14 via a first control circuit 16 and a second control circuit 17. The first control circuit 16 and the se... | 09/16/2008 |
| 7420424 | Power amplifier transmission line transformer Disclosed herein is a power amplifier which is used in a wireless communication system and is capable of improving efficiency in an entire output power range and extending the dynamic range without additional switches, by including a drive amplification unit and a p... | 09/02/2008 |
| 7417504 | Startup and shutdown click noise elimination for class D amplifier A method of minimizing an audible click noise from a speaker in a Class D audio power amplifier upon shutdown or startup of a switching stage having two switches series connected at a node, the speaker being connected to the node via an output filter comprising an i... | 08/26/2008 |
| 7417508 | Multiple RF path amplifiers An amplifier is disclosed for providing processing of a variable RF signal, the amplifier comprising a first parallel gain stage and a plurality of second parallel gain stages electrically disposed between an input fixed impedance matching circuit and an output fixe... | 08/26/2008 |
| 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 |
