Quotables
"To place a man in a multi-stage rocket and project him into the controlling gravitational field of the moon where the passengers can make scientific observations, perhaps land alive, and then return to earth--all that constitutes a wild dream worthy of Jules Verne. I am bold enough to say that such a man-made voyage will never occur regardless of all future advances."
Lee deForest, American radio pioneer ; 1957
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| Number | Title | Issue Date |
| 8174333 | Power-efficient spectrum shaping for a magnetic link Various embodiments relate to a transmission circuit and related method of shaping the transmission spectrum of a carrier signal. The transmission circuit may comprise a plurality of switching amplifier stages that are controlled by a modulation sequence produced by... | 05/08/2012 |
| 8106720 | Polar modulation apparatus and method with common-mode control The present invention relates to a polar modulation apparatus and method, in which a polar-modulated signal is generated based on separately processed phase modulation (PM) and amplitude modulation (AM) components of an input signal. An amplified polar modulated out... | 01/31/2012 |
| 8085108 | Digital polar radio frequency transmitting device with a radiofrequency reference oscillator and an integrated circuit comprising such device A radiofrequency transmitting device delivers output signals having a chosen radiofrequency from input data split up into complementary phase data and amplitude data. This device includes a radiofrequency reference oscillator for outputting a reference signal having... | 12/27/2011 |
| 7936229 | Local oscillator incorporating phase command exception handling utilizing a quadrature switch A novel and useful apparatus for and method of local oscillator generation employing an exception handling mechanism that permits an oscillator having a limited modulation range to handle the large modulation ranges demanded by modern wideband wireless standards suc... | 05/03/2011 |
| 7830220 | Modulator arrangement and method for signal modulation A modulator arrangement includes a power amplifier which receives a carrier signal and has a current control input and a voltage supply input. The modulator arrangement further includes a supply voltage modulator having an output coupled to the voltage supply input ... | 11/09/2010 |
| 7812684 | Communication apparatus A communication apparatus has a local oscillator which performs phase modulation based on a phase component of a baseband signal and outputs a phase modulated signal, a controlling circuit which is supplied with an integer portion included in an amplitude component ... | 10/12/2010 |
| 7764139 | Polar modulation with extended AM Apparatus and methods for adjusting spectral characteristics of a polar modulation signal in a polar modulator are described. A detection circuit is configured to determine when an FM signal component of the modulation signal exceeds a threshold value. The output of... | 07/27/2010 |
| 7760043 | Polar modulation apparatus Provided is a polar modulation apparatus capable of performing power limit with a simple configuration even when controlling a transmission power and increasing the transmission signal output power control range. A polar modulation device (1) includes an ampl... | 07/20/2010 |
| 7755444 | Polar modulation apparatus and method using FM modulation The present invention relates to a polar modulation apparatus and method, in which an in-phase and a quadrature-phase signal are processed in the analog domain to generate an analog signal corresponding to a derivative of a phase component of said polar-modulated si... | 07/13/2010 |
| 7746187 | Self-calibrating modulator apparatuses and methods A self-calibrating modulator apparatus includes a modulator having a controlled oscillator and an oscillator gain calibration circuit. The oscillator gain calibration circuit includes an oscillator gain coefficient calculator configured to calculate a plurality of f... | 06/29/2010 |
| 7688156 | Polar modulation transmission circuit and communication device A transmission circuit for outputting transmission signals with a low distortion and a high efficiency over a wide range of output power is provided. A signal generation section (11) generates an amplitude signal and a phase signal. An angle modulation sectio... | 03/30/2010 |
| 7619487 | Polar modulation without analog filtering This disclosure relates to systems and methods for polar modulation without analog filters. Digitals filters, a second order hold interpolator and a reconfigurable third order noise shaper can be used instead of the analog filters used in conventional polar modulato... | 11/17/2009 |
| 7576623 | Amplitude modulation driver A circuit includes a first semiconductor device and a second semiconductor device. The first semiconductor device has a first source region, a first gate region, and a first drain region. The first gate region and the first drain region are separated by a first dist... | 08/18/2009 |
| 7545232 | Polar modulator arrangement and polar modulation method A polar modulator arrangement has a first and a second node to receive a digital signal with a first and a second component corresponding to a digital amplitude component and a digital phase component. A digital interpolation filter generates an interpolated first c... | 06/09/2009 |
| 7518461 | Method of configuring a polar-based modulator using a parameter look-up table A polar-based modulator includes an amplitude signal generator operating at a set gain and a command module that selects an appropriate one parameter lookup table based on an identification of the current network communication system. The command module receives a d... | 04/14/2009 |
| 7427903 | Polar modulator and a use thereof A polar modulator has a low AM-AM and AM-PM distortion comprises a phase locked loop. The phase locked loop is designed for outputting a high-frequency signal with a frequency derived from a phase modulation signal at an actuating input of the phase locked loop. A f... | 09/23/2008 |
| 7412213 | Envelope limiting for polar modulators Envelope limiting for a polar modulator. A system is provided that intelligently compresses the amplitude modulation in a polar modulator so that it can be implemented with a single-stage variable gain amplifier. Limiting the amplitude modulation range on the low si... | 08/12/2008 |
| 7378918 | Two-point modulation type phase modulation apparatus, polar modulation transmission apparatus, wireless transmission apparatus and wireless communication apparatus There provides a two-point modulation phase modulation apparatus capable of obtaining an RF phase modulation signal of superior modulation precision with low power consumption and a simple configuration even in the event of inputting a wide band baseband modulation ... | 05/27/2008 |
| 7358829 | Transmission apparatus, communication apparatus and mobile radio apparatus Transmission apparatus capable of reducing distortion of the vector modulation wave that is the transmission output to a sufficiently small level is provided. An amplifying section (105) generates a vector modulation wave based on an amplitude component modul... | 04/15/2008 |
| 7333554 | Communication system with frequency modulation and a single local oscillator A signal processing unit is described relates to a communication system by radio waves with frequency modulation comprising a signal processing unit, a transmission stage for transmitting a transmission signal in response to a modulated control signal and in respons... | 02/19/2008 |
| 7330503 | Signal generator with frequency offset unit in the base band A signal generator comprises at least one first base band unit and a second base band unit, generating a digital base band signal. At least one first frequency offset unit, connected to the first base band unit, which adds the output signal form the second base band... | 02/12/2008 |
| 7324787 | Method of ramping up output level of power amplifier of radio communication system, communication semiconductor integrated circuit, and radio communication system In a radio communication system having a phase control loop for phase modulation and an amplitude control loop for amplitude modulation and being capable of time divisional transmission and reception under a predetermined time management, when transmission in a firs... | 01/29/2008 |
| 7313175 | Method for avoiding interference radiation of AM transmitters used in digital transmission A method for avoiding spurious emissions in an AM transmitter for digital transmission includes converting a digital modulation for controlling the AM transmitter into an amplitude signal and a phase-modulated RF signal. Non-linear distortions in an amplitude respon... | 12/25/2007 |
| 7289005 | Polar modulator and a method for modulation of a signal A polar modulator contains a phase locked loop which is designed to emit a radio-frequency signal at one frequency to one output, with the frequency being derived from the reference signal and from a phase modulation signal at a control input of the phase locked loo... | 10/30/2007 |
| 7280003 | Modulation device and transmitter comprising such a device A signal modulation device comprises a delta-sigma modulator disposed for transforming an amplitude-modulation signal in baseband into a pulse signal. It also comprises a phase modulator receiving, at its input, analogue phase-modulation signals in baseband. The pul... | 10/09/2007 |
| 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 |
| 7274748 | AM to FM correction system for a polar modulator A transmitter for a mobile terminal including a polar modulator that compensates for amplitude to frequency distortion (AM to FM distortion) of a power amplifier in the transmit chain is provided. In general, the modulator includes a polar converter that converts an... | 09/25/2007 |
| 7248639 | Method for reducing the out-of-band emission in AM transmitters for digital transmission A method for reducing out-of-band emission in an AM transmitter for digital transmission includes generating, from a digital modulation signal, an amplitude signal and a phase-modulated radio frequency signal configured to control the AM transmitter. A digital modul... | 07/24/2007 |
| 7221239 | Variable power divider A variable power divider and method can vary the RF power between ports in a high power and multi-carrier RF environment, such as is used in controlling signals sent and received in a base station antenna. The variable power divider can include a single-control phas... | 05/22/2007 |
| 7218951 | Continuous closed-loop power control system including modulation injection in a wireless transceiver power amplifier A single continuous closed-loop power control feedback system provides seamless power control for a power amplifier and also enables an AM signal to be injected into the power amplifier through the power amplifiers' control port. The AM signal is developed by an I/Q... | 05/15/2007 |
| 7180384 | Universal signal modulators Universal signal modulators structures are shown which are particularly useful for selectively generating polar-modulated digital sequences from input phase and amplitude symbols and for generating quadrature-modulated digital sequences from input first and second q... | 02/20/2007 |
| 7171170 | Envelope limiting for polar modulators Envelope limiting for a polar modulator. A system is provided that intelligently compresses the amplitude modulation in a polar modulator so that it can be implemented with a single-stage variable gain amplifier. Limiting the amplitude modulation range on the low si... | 01/30/2007 |
| 7162211 | Methods and apparatus for transmitting information between a basestation and multiple mobile stations Methods and apparatus for scheduling mobile stations (MSs) to download data and/or to control the rate of downloading to an MS from a base station (BS) as a function of downlink channel condition information are described. Artificial channel variations, which can be... | 01/09/2007 |
| 7129790 | Phase-locked loop circuit A phase-locked loop circuit has an output amplifier (27) and a main feedback path from the output of the output amplifier (27). A subsidiary feedback path is provided directly from the output of the circuit's VCO (32). At the start of operation,... | 10/31/2006 |
| 7110730 | Apparatus for mobile communication system which performs signal transmission by amplitude modulation and phase modulation A mobile communication system has a mobile phone in which a voltage is set corresponding to the characteristic variation of a PA even when a PA having characteristic variation is used. The mobile phone employs a polar loop method, which comprises an antenna (1 | 09/19/2006 |
| 7099636 | Continuous closed-loop power control system including modulation injection in a wireless transceiver power amplifier A single continuous closed-loop power control feedback system provides seamless power control for a power amplifier and also enables an AM signal to be injected into the power amplifier through the power amplifiers' control port. The AM signal is developed by an I/Q... | 08/29/2006 |
| 7023292 | Polar modulation using amplitude modulated quadrature signals Polar modulators include a phase splitter, a controller, variable current sources, transistor circuits, and a combiner. The phase splitter splits a RF carrier signal into quadrature component signals that are 90 degrees out of phase with each other. The controller g... | 04/04/2006 |
| 7024167 | Method for amplitude modulation of a radio frequency signal, and device therefor The invention provides a method and a device for amplitude modulation of a radio frequency signal using a variable-gain radio frequency power amplifier, for automatic control of the amplifier output signal by generating an error signal between an amplitude modulatio... | 04/04/2006 |
| 7010280 | Linear RF power amplifier and transmitter A transmitter circuit means is arranged to provide linear amplification of non-constant envelope modulated RF signals by directly amplitude modulating the transmitter power amplifier with the amplitude component of the baseband signal. In addition, the signal to be ... | 03/07/2006 |
| 6985703 | Direct synthesis transmitter A direct synthesis transmitter. A very efficient and highly linear direct synthesis transmitter is provided that can be used to directly synthesize and transmit any type of modulated signal. The direct synthesis transmitter includes a phase-locked loop (PLL) with co... | 01/10/2006 |
