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| Number | Title | Issue Date |
| 7436260 | Controlling the ratio of amplification factors between linear amplifiers An electronic device where the ratio between two amplification factors of two amplifiers, called main amplifiers, is adjusted using a control means. The control means constantly equalizes the output signals of the two main amplifiers by adapting one of the control s... | 10/14/2008 |
| 7362171 | High-frequency amplifier It is an object of this invention to provide a high-frequency amplifier which can efficiently amplify an input signal in a plurality of different frequency bands in a simple configuration. The high-frequency amplifier is configured such that an RF signal having n fr... | 04/22/2008 |
| 7362170 | High gain, high efficiency power amplifier An amplifier has a main amplifier circuit with multiple amplification stages, including a driving stage and an auxiliary amplifier circuit with multiple amplification stages, including a driving stage. A splitter circuit splits an input signal to provide path asymme... | 04/22/2008 |
| 7339426 | High efficiency linear amplifier employing dynamically controlled back off A high efficiency radio frequency (RF) power amplifier having dynamically controlled back off is disclosed. The RF input voltage is sampled by an adaptive analog signal processing circuit. The adaptive analog signal processing circuit controls the supply voltage to ... | 03/04/2008 |
| 7315206 | Travelling-wave amplifier A traveling-wave amplifier includes amplifiers coupled anti-parallel to transmission lines. Phase(s) of the amplifiers provide phase matching, which may additionally or alternately be provided by couplers or spatial offset of the amplifiers and couplers. The traveli... | 01/01/2008 |
| 7301395 | Doherty amplifier A Doherty amplifier is described which comprises: a power splitter (120) having a first output and a second output, wherein the first output is connected to a main power splitter (392) having first and second outputs which differ in phase by 90°; and ... | 11/27/2007 |
| 7295065 | High efficiency doherty amplifier with a segmented main amplifier A Doherty amplifier that includes a main amplifier device and an auxiliary amplifier device. The main amplifier device includes a plurality of independently controllable amplifier segments. The system further includes a coupler for coupling an input signal to each o... | 11/13/2007 |
| 7263334 | Directional coupler for use in VCO unequal power splitting A transceiver is provided that includes a TX path mixer that up converts, a RX path mixer that down converts, and a local oscillator that provides a mixing frequency for the TX and RX mixers. The transceiver further provides a directional coupler having an input pat... | 08/28/2007 |
| 7254374 | Switchable multi-transmitter combiner and method A transmitter-combining broadcast system and method is provided that allows IBOC-compatible broadcast with simple analog-to-IBOC upgradeability with high efficiency. At full power, a standard analog signal and an IBOC-compatible digital signal are transmitted by com... | 08/07/2007 |
| 7248129 | Microstrip directional coupler A microwave directional coupler includes a microstrip conductor formed on a dielectric substrate and forming a main transmission line having in and out ports that receive signals to be coupled. A substantially U-shaped microstrip conductor is formed over the dielect... | 07/24/2007 |
| 7239122 | Multi-channel radiometer imaging system A radiometer system includes a housing and an RF board contained within the housing. Balanced radiometer channels receive an unknown signal and known reference. Each balanced radiometer channel includes at least one quadrature hybrid and amplifier circuit to provide... | 07/03/2007 |
| 7227430 | Multichip module A bondwire transition arrangement for interconnecting a signal port on one IC of a multichip module with a signal port on another, adjacent, IC of the same module employs a distributed signal-transition process in which the signal on one port appears as subsignals a... | 06/05/2007 |
| 7221221 | Power amplifier with pre-distorter Amplifier apparatus comprising a power amplifier (4) having an operating frequency in the radio frequency (‘RF’) or microwave or higher ranges and a pre-distorter (2), the characteristics of the power amplifier (4) comprising a distortion fr... | 05/22/2007 |
| 7221915 | Electromagnetic wave transmitter, receiver and transceiver systems, methods and articles of manufacture The invention relates to a system for electromagnetic processing of an input wave involving receiving a modified signal derived from two or more signals that represent the input wave when combined; and regulating the modified signal using at least one analog signal ... | 05/22/2007 |
| 7221139 | Multi-channel radiometer imaging system A radiometer system includes a housing and an RF board contained within the housing. Balanced radiometer channels receive an unknown signal and known reference. Each balanced radiometer channel includes at least one quadrature hybrid and amplifier circuit to provide... | 05/22/2007 |
| 7199570 | Multi-channel radiometer imaging system A radiometer includes a housing and an RF board carried by the housing. A hybrid and amplifier circuit receives an unknown signal and a known reference signal. A switch receives signals as inputs from the hybrid and amplifier circuit and switches between the inputs.... | 04/03/2007 |
| 7190240 | Multi-section coupler assembly A coupler assembly may include first and second electromagnetic couplers connected together. In some examples, the couplers may be connected in cascade configuration, with at least the second coupler including at least third and fourth couplers connected in tandem c... | 03/13/2007 |
| 7183843 | Electronically tuned power amplifier A power amplifier apparatus that includes a main power amplifier circuit and an injection power amplifier circuit is provided. The main amplifier includes a pair of quadrature coupled amplifiers. Similarly, the injection power amplifier also includes pair of quadrat... | 02/27/2007 |
| 7171171 | GaAs RF signal detection circuit with operational amplifier A mobile terminal senses transmitted power in a Gallium Arsenide (GaAs) circuit. The GaAs circuit provides a steady reference voltage through the use of an operational amplifier and feedback circuit. The operational amplifier drives the bases of two transistors to c... | 01/30/2007 |
| 7161425 | Radio frequency power amplifier for lossless power combining An amplifier device (40) includes at least one amplifier (42) having an output. A plurality of conductors (48, 50, 52) are coupled to the output in parallel with each other. The plurality of conductors (48, 50, 52) each has an electrical ... | 01/09/2007 |
| 7151913 | Electromagnetic wave transmitter, receiver and transceiver systems, methods and articles of manufacture The invention relates to a system for electromagnetic processing of an input wave involving receiving a modified signal derived from two or more signals that represent the input wave when combined; and regulating the modified signal using at least one characteristic... | 12/19/2006 |
| 7148746 | High efficiency amplifier An amplifier includes a main amplifier circuit with an input and output. At least one auxiliary amplifier circuit has an input and output, and is selectively operable to operate in combination with the main amplifier circuit. A signal combining network is coupled wi... | 12/12/2006 |
| 7149497 | Radio signal receiving device The radio signal receiving device that has an input terminal for inputting an input signal and an output terminal for amplifying the signal inputted to the input terminal and then outputting the signal, comprises an insulating container comprising the input terminal... | 12/12/2006 |
| 7145396 | Method and apparatus for protecting devices in an RF power amplifier A method and apparatus are provided for use with a power amplifier for protecting active devices on the power amplifier. A peak detector is used by control circuitry to detect the presence of a peak voltage that exceeds a threshold voltage. In response to the detect... | 12/05/2006 |
| 7142052 | Travelling wave amplifiers A traveling wave amplifier (TWA) comprising two or more amplification modules, the inputs of adjacent amplification modules being connected together by a first inductance component of a first characteristic impedance, a second inductance component of a second charac... | 11/28/2006 |
| 7138861 | Load mismatch adaptation in coupler-based amplifiers Coupler-based amplifiers provide a measure of load mismatch based on the difference between the two output signal amplitudes from the amplifiers. This measure can be used to control variable matching networks (VMNs) or amplifier supply voltages to maintain constant ... | 11/21/2006 |
| 7135848 | Highly integrated radiometer sensor cell A highly integrated radiometer sensor cell includes a base having opposing surfaces with one surface adapted for surface mounting on a board. A radio frequency (RF) feed receives RF signals and at least one MMIC is operatively connected to the RF feed and receives t... | 11/14/2006 |
| 7126417 | Distributed gain network A system and method for a distribution network is provided wherein cascaded power amplifiers with bypass switching are disposed along the branches of the network. The amplifiers may have an RF modem and a programmable digital computer that enables communication with... | 10/24/2006 |
| 7120555 | Signal statistics determination A signal can be analysed to determine statistical characteristics indicative of, for example, the predictability or time reversibility of the signal. The signal is examined to locate events corresponding to the crossing of predetermined levels with predetermined slo... | 10/10/2006 |
| 7088086 | Multi-channel radiometer imaging system A radiometer includes a housing and an RF board carried by the housing. A hybrid and amplifier circuit receives an unknown signal and a known reference signal. A switch receives signals as inputs from the hybrid and amplifier circuit and switches between the inputs.... | 08/08/2006 |
| 7081785 | Comparing circuit and offset compensating apparatus While a switch SW4 is connected to “a”-terminal side, offset of a differential output voltage “A−” of a D/A converter 500a (500b) is held in a comparator 400, and is reflected to a reference voltage. Thereafter, th... | 07/25/2006 |
| 7078976 | High power Doherty amplifier A high power Doherty amplifier circuit having at least one input terminal and at least one output terminal comprising at least one carrier transistor (30) forming a main amplifier stage; at least one peak transistor (32) forming a peak amplifier stage;... | 07/18/2006 |
| 7064606 | High efficiency amplifier and method of designing same An amplifier includes a main amplifier circuit and at least one auxiliary amplifier circuit. Portions of an RF signal to be amplified are delivered to the main and auxiliary amplifiers. The auxiliary amplifier circuit is selectively operable to operate in combinatio... | 06/20/2006 |
| 7061316 | High frequency power detector with dBm-linear characteristic and method of regulating the power of an electrical HF-oscillation A high frequency power detector includes an input coupling arrangement that couples an electrical HF-oscillation into a basic circuit portion including at least a first diode and a circuit node. The power detector further includes a series circuit of a resistor and ... | 06/13/2006 |
| 7062234 | Pre-distortion cross-cancellation for linearizing power amplifiers In an amplifier system having two or more different amplifier sub-systems, the input signal to at least one of the amplifier sub-systems is pre-distorted based on the combined output signal from the two or more amplifier sub-systems. In one embodiment, each other am... | 06/13/2006 |
| 7038539 | RF amplifier employing active load linearization A method and apparatus for linear amplification of a modulated carrier signal or multi-carrier signal is disclosed. The linearity of the amplifier is improved by employing dynamic load line adjustments. A second current source coupled to the amplifier output load is... | 05/02/2006 |
| 7034516 | Multi-channel radiometer imaging system A radiometer system includes a housing and an RF board contained within the housing. Balanced radiometer channels receive an unknown signal and known reference. Each balanced radiometer channel includes at least one quadrature hybrid and amplifier circuit to provide... | 04/25/2006 |
| 6992546 | Electronic phase shifter with enhanced phase shift performance A varactor based phase shifter that increases phase shift range using a lower characteristic impedance between quadrature ports than is used at its input/output ports. The circuit makes use of a four port coupler arrangement that imbeds a quarter wave impedance tran... | 01/31/2006 |
| 6970025 | Programmable frequency divider Various apparatus and method embodiments are disclosed. One apparatus embodiment, among others, comprises a frequency divider configured to provide an output signal having a period equal to a period of a clock signal multiplied by a programming division ratio, the f... | 11/29/2005 |
| 6949988 | Constant impedance filter A constant impedance filter maintains a constant input impedance for frequencies that are both inside the filter passband and outside the filter passband. The constant input impedance appears as a pure resistance. The constant impedance filter includes a plurality o... | 09/27/2005 |
