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A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 8054127 | Feedforward distortion compensation amplifier A feedforward distortion compensation amplifier includes an adjusting unit for adjusting a gain and a phase of an input signal, a first amplifier for amplifying a signal outputted from the adjusting unit, a delay unit for delaying the input signal, and a coupler for... | 11/08/2011 |
| 8030998 | Active feed forward amplifier An exemplary embodiment of the feed forward amplifier replaces traditional distributed directional couplers, splitters, and delay lines. Moreover, an exemplary feed forward amplifier architecture combines active implementations of RF couplers, power splitters, and/o... | 10/04/2011 |
| 7902922 | Feedforward amplifier and control method thereof In a feedforward amplifier (200) including a signal cancellation circuit (10) and a distortion eliminating circuit (20), a harmonic reaction amplifier (130) is used as a main amplifier of the signal cancellation circuit. A controller (... | 03/08/2011 |
| 7791413 | Linearizing technique for power amplifiers Embodiments described herein relate to amplification circuits. In some embodiments the amplification circuit includes a power amplifier, a feedforward error compensation loop, and phase feedback and amplitude feedback error compensation loops nested within the feedf... | 09/07/2010 |
| 7679441 | High frequency power amplifier A high frequency power amplifier comprises: an amplifier that amplifies signals received from a first input terminal and outputs amplified signals to an output terminal; a bypass route that connects a second input terminal to the output terminal without passing thro... | 03/16/2010 |
| 7679440 | Feedforward amplifier There is disclosed a feedforward amplifier for compensating for distortion produced in an amplifier. The feedforward amplifier controls the phase in a vector adjuster effectively. The feedforward amplifier has a first variable phase shifter PH1— | 03/16/2010 |
| 7646239 | Feed-forward amplifier There is provided a feed-forward amplifier which enables a predistortion circuit to obtain sufficient distortion compensation effects even if ambient temperature or the like changes. The feed-forward amplifier includes a variable attenuator for controlling the amoun... | 01/12/2010 |
| 7642850 | Feedforward linearization of RF power amplifiers RF amplifier system (200) incorporating feedforward linearization. The system includes a digital waveform source (202) generating digital data s(t) representative of at least one analog signal. The system also includes a feedforward linearization circu... | 01/05/2010 |
| 7459974 | System and method for distortion cancellation in amplifiers A distortion cancellation amplifier is described having a main amplifier and an error amplifier. The main amplifier, in response to an input signal, generates an output signal having an amplified signal component and a distortion signal component. The error amplifie... | 12/02/2008 |
| 7436259 | Amplification apparatus An amplification apparatus that has a distortion detection loop that detects distortion components contained in an amplified signal to be amplified that is amplified by an amplifier 3, and a distortion removal loop that removes distortion components from the ... | 10/14/2008 |
| 7403070 | Band selection type feed forward amplifier The present invention has for its object to provide, in an environment where plural radio systems coexist, a feed forward amplifier capable of adaptively selecting a frequency band. The feed forward amplifier of the present invention comprises a distortion detection... | 07/22/2008 |
| 7382187 | Semiconductor integrated circuit and amplifier for suppressing pop sound while minimizing voltage transition settling time A semiconductor integrated circuit includes a capacitor element which defines a prescribed decay time constant with one or more resistors, an MOS transistor connected to the capacitor element via its gate, and a constant current generating element which generates a ... | 06/03/2008 |
| 7362168 | Audio amplifier In a first aspect, the invention provides an audio amplifier. A regulator reference signal corresponding to an input audio signal is generated by regulator reference generator. A power signal is generated corresponding to the regulator reference signal by a voltage ... | 04/22/2008 |
| 7359680 | Delay calibration in polar modulation transmitters A method and apparatus for dynamically compensating for delay mismatch between a supply signal and an input signal of a power amplifier in polar modulation transmitters. One exemplary polar modulation transmitter according to the present invention comprises a power ... | 04/15/2008 |
| 7359682 | Apparatus and method for improving efficiency of power amplifier operating under large peak-to-average power ratio An apparatus and method for improving the efficiency of a power amplifier operating on the basis of a signal of a large peak-to-average power ratio (PAR). A main amplification part detects envelope values of an input baseband signal, reduces a peak value of the enve... | 04/15/2008 |
| 7348909 | Reconfigurable mixed-signal VLSI implementation of distributed arithmetic Disclosed herein is a reconfigurable mixed signal distributed arithmetic system including: an array of tunable voltage references operable for receiving a delayed digital input signal; a combination device in electrical communication with the array of tunable floati... | 03/25/2008 |
| 7348843 | Predistortion linearizer using cascaded lower-order linearizers A predistortion linearizer for predistorting a radiofrequency (RF) signal includes a first third-order predistortion linearizer having an input for receiving the RF signal, and a second third-order predistortion linearizer connected in cascade with the first lineari... | 03/25/2008 |
| 7342446 | Apparatus and method for controlling feed-forward amplifiers An apparatus and method for operating a feed-forward amplifier in which, after the signal-cancellation and intermodulation-cancellation loops have initially been nulled, the feed-forward amplifier is operated so that both loops are controlled so as to minimize inter... | 03/11/2008 |
| 7342442 | Variable gain amplifying apparatus and wireless communication apparatus A variable gain amplifying apparatus has an amplifier, one or more first switching elements connected in parallel to the amplifier, and a phase shifter connected in series to the first switching element. The first switching element is enabled if the level of an inpu... | 03/11/2008 |
| 7340265 | Method and apparatus for transient frequency distortion compensation Transient distortion is compensated for by multiplying an exponentially-decaying phase shift onto the distorted waveform. The exponentially decaying phase shift waveform is patterned after the transient which typically takes the form of an exponential and occurs upo... | 03/04/2008 |
| 7340007 | Apparatus, methods and articles of manufacture for pre-emphasis filtering of a modulated signal The invention is directed to a system for determining a transfer function for emphasizing an electromagnetic signal prior to being processed by determining a discrete transfer function for a processing system, such as a wideband phase modulator; determining a target... | 03/04/2008 |
| 7336725 | Digital predistortion system and method for high efficiency transmitters A system for digitally linearizing the nonlinear behaviour of RF high efficiency amplifiers employing baseband predistortion techniques is disclosed. The system provides additive or multiplicative predistortion of the digital quadrature (I/Q) input signal in order t... | 02/26/2008 |
| 7336128 | Feed forward amplifier for multiple frequency bands The present invention has for its object to provide, in an environment where plural radio systems coexist, a feed forward amplifier for multiple frequency bands, capable of adaptively selecting the frequency band which is used. The feed forward amplifier of t... | 02/26/2008 |
| 7333561 | Postdistortion amplifier with predistorted postdistortion A postdistortion amplifier that produces a postdistortion amplifier output signal based on a signal input to the postdistortion amplifier reduces distortion in the postdistortion amplifier output signal by digitally predistorting an error signal. The postdistortion ... | 02/19/2008 |
| 7333810 | Method and system for provisioning services in a telecommunications network The present invention is a telecommunication system, comprising of at least one base station connected to a telecommunication network, a plurality of subscriber stations each cooperating with the base station to establish a connection between a user device operably ... | 02/19/2008 |
| 7330704 | Electrical signal pre-conditioning A method and circuitry for pre-conditioning an electrical signal. The method comprises limiting the strength of the signal to not exceed a limit signal strength corresponding to the onset of substantial non-linear response of an amplifier to which the limited signal... | 02/12/2008 |
| 7330073 | Arbitrary waveform predistortion table generation Predistortion that will compensate for distortion introduced by a power amplifier circuit is determined by applying a time-varying reference signal to the power amplifier circuit, wherein at each moment the time-varying reference signal has a reference amplitude and... | 02/12/2008 |
| 7323922 | Digitally controlled gain stage having an analogue control input A signal processing system has a first, digitally controlled, gain element, a second, analogue controlled, gain element and a gain control unit configured to receive a gain request signal and to generate a first gain control signal to be input to the first gain elem... | 01/29/2008 |
| 7321635 | Linearization of amplifiers using baseband detection and non-baseband pre-distortion In an amplifier system that linearizes an amplifier by pre-distorting the input signal prior to amplification, a baseband pre-distortion processor processes the input signal in a digital baseband domain to generate one or more pre-distortion parameters based on the ... | 01/22/2008 |
| 7321752 | Linear amplification arrangement with non-linear amplifier element for a mobile radio device A system and method to optimize the efficiency of an amplifier device is provided by the including a non-linear amplifier in a mobile radio device. A phase displaced signal in relation to the input signal is respectively produced in the amplifier device with a non-l... | 01/22/2008 |
| 7317353 | Amplification device An amplifier apparatus in which a signal is amplified by an amplifier and distortion produced by the amplifier is compensated for, that can continue to operate even in cases where the amplitude of a distortion component contained in the amplified signal after distor... | 01/08/2008 |
| 7313370 | Intermodulation product cancellation in communications Intermodulation products in the amplifier circuitry of a communications device are cancelled. A primary carrier is processed in a first main branch of amplifier circuit. The primary carrier is coupled to a secondary branch through a first signal splitters. Intermodu... | 12/25/2007 |
| 7308234 | Feedforward spur cancellation approach using low IP amplifier A power amplifier circuit (40) that includes an error correction loop (44) having a lower IP3 error correction amplifier (54) than a main power amplifier (46) in a main signal path (48). A first attenuator (52) in the error ... | 12/11/2007 |
| 7301396 | System and method for distortion cancellation in amplifiers A distortion cancellation amplifier is described having a main amplifier and an error amplifier. The main amplifier, in response to an input signal, generates an output signal having an amplified signal component and a distortion signal component. The error amplifie... | 11/27/2007 |
| 7301397 | Enhanced efficiency feed forward power amplifier with delay mismatched error cancellation loop A delay mismatched feed forward power amplifier is disclosed. Loop 1 includes a main amplifier and is used to derive a carrier cancelled sample of the main amplifier output. Loop 2 includes an error amplifier used to amplify the carrier cancelled signa... | 11/27/2007 |
| 7295074 | Doherty power amplifier with phase compensation A Doherty power amplifier is provided that includes a main amplifier device and an auxiliary amplifier device. The Doherty power amplifier further includes a phase compensation network. The phase compensation network is configured to maintain a substantially constan... | 11/13/2007 |
| 7289575 | Signal processing means A non-linearity generator operates on a signal between a frequency converter and an amplifier and acts as a postdistorter for the component it follows and as a predistorter for the component it precedes, thus linearizing the overall input-output characteristic of th... | 10/30/2007 |
| 7289773 | Digital transmitter system employing self-generating predistortion parameter lists and adaptive controller A method and apparatus for digital predistortion of power amplifiers are disclosed. Successful digital predistortion parameter settings are correlated with the operating conditions that affect the distortion of an amplifier. These operating conditions may include in... | 10/30/2007 |
| 7276985 | Transmission modulation apparatus, communication apparatus and mobile wireless apparatus Provided is a transmission modulation apparatus, using polar modulation of two-point modulation scheme, capable of completing a timing adjustment of a BB phase modulation signal and BB amplitude modulation signal in a short time. A phase modulation section (10 | 10/02/2007 |
| 7272366 | Method and apparatus for reducing RF filter induced distortion in a wide bandwidth wireless system by the use of channel-dependent RF filter compensation A mobile station is constructed to include a transceiver comprising a transmitter circuit having a transmit RF filter that passes a transmit band of frequencies that is partitioned into transmit frequency channels and a receiver circuit having a receiver RF filter t... | 09/18/2007 |
