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| Number | Title | Issue Date |
| 8145147 | Power amplifier edge evaluation-alternative envelope modulator A modulator includes a power driver, a power amplifier, and a heterojunction bipolar transistor (HBT) type device. The power driver is for receiving an amplitude modulation signal and for providing a control signal. The power amplifier is for receiving a phase modul... | 03/27/2012 |
| 8140030 | Adaptive impedance converter adaptively controls load impedance A transmitter generates first and second constant-envelope radio frequency (RF) component signals having first and second phase angles. The first and second phases are controlled by a phase controller. First and second nonlinear power amplifiers (PAs) are modulated ... | 03/20/2012 |
| 8073406 | Amplitude modulation circuit in polar transmitter and method for calibrating amplitude offset in polar transmitter An amplitude modulation circuit in a polar transmitter and a method for calibrating amplitude offset in the polar transmitter are provided. The amplitude modulation circuit includes a digital-to-analog converter (DAC), a low pass filter (LPF), a gm stage, and a cali... | 12/06/2011 |
| 8005441 | DC offset correction of a power detector used with a continuous transmission radio frequency signal The present invention relates to estimating a direct current (DC) offset of a power detection circuit when an estimated instantaneous amplitude of a continuous-transmission amplitude-modulated (AM) radio frequency (RF) signal is below a first threshold. The power de... | 08/23/2011 |
| 8005442 | Wireless network connection system and method using injection locked oscillators A wireless network connection system remotely connects to a network without the use of crystal reference oscillators. This provides communication at long range using a low transmit Effective Isotropic Radiated Power (EIRP). Operation is obtained through a combinatio... | 08/23/2011 |
| 7991366 | Methods and apparatus for reconstructing amplitude modulation signals in polar modulation transmitters Methods and apparatus for reconstructing discrete-time amplitude modulation signals in polar modulation transmitters. An exemplary polar modulation transmitter includes a symbol generator, a rectangular-to-polar converter, a peak phase detector, and an amplitude mod... | 08/02/2011 |
| 7945223 | Polar modulator with signed amplitude reducing phase transitions A polar modulator including a signal converter configured to provide a phase signal and an amplitude signal based on at least one received signal is disclosed. A digital-to-analog converter is coupled to the signal converter, the digital-to-analog converter configur... | 05/17/2011 |
| 7937048 | Signal transmission apparatus and signal transmission method A signal transmission apparatus of the invention comprises: a correlator 12 for shaping a spectrum of a signal; and a precoder 12 disposed on a previous stage of the correlator and including an adder which subtracts an output signal of a feedback filte... | 05/03/2011 |
| 7925226 | Transmission circuit A transmission circuit capable of transmitting a modulated wave signal using polar modulation in a broad band and with low power consumption is provided. The transmission circuit generates an amplitude signal and a phase signal based on data to be transmitted, and s... | 04/12/2011 |
| 7822393 | Transmission apparatus and communication apparatus The transmission apparatus according to the present invention can reduce transmission output noise leaking into the receiving apparatus even when the transmission apparatus is applied to wireless equipment using the W-CDMA scheme. Transmission apparatus (100)... | 10/26/2010 |
| 7805115 | Variable filter systems and methods for enhanced data rate communication systems A radio frequency output power control system is disclosed for use in communication systems that use a modulation scheme having a non-constant amplitude envelope. The system includes a power amplifier having a radio frequency input node for receiving a radio frequen... | 09/28/2010 |
| 7715808 | Polar modulating circuit, polar coordinate modulating method, integrated circuit and radio transmission device This invention intends to provide a polar modulating circuit, a polar modulating method, an integrated circuit and a radio transmission device capable of compensating for a delay difference between paths of a phase signal and an amplitude signal while suppressing an... | 05/11/2010 |
| 7702299 | Modulation circuit device, modulation method and radio communication device The amplitude modulator comprises: an angle modulator for angle-modulating a phase signal to be inputted; a waveform shaping means in which, (1) when the magnitude of an amplitude signal to be inputted becomes smaller than a first prescribed value, a waveform of the... | 04/20/2010 |
| 7702300 | Envelope modulator saturation detection using a DC-DC converter In an embodiment of the invention, a system provides for efficient polar and linear signal modulation. The system has a controller coupled to a voltage converter and a modulator. The system also has an amplifier coupled to the voltage converter and the phase modulat... | 04/20/2010 |
| 7693496 | Polar transmitter arrangement and method A transmitter arrangement, a polar modulator arrangement, a polar modulation method and a polar transmitter arrangement are disclosed. A polar modulator arrangement includes a polar generator to provide a phase component and an amplitude component of a complex signa... | 04/06/2010 |
| 7620377 | Bandwidth enhancement for envelope elimination and restoration transmission systems Systems and methods for increasing bandwidth capability of an envelope elimination and restoration (EER) transmitter. A frequency response of a power supply modulator of the transmitter is approximated. An inverse response is applied to the envelope signal prior to ... | 11/17/2009 |
| 7587179 | 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... | 09/08/2009 |
| 7583940 | Transmission circuit and communication apparatus employing the same A transmission circuit is provided which can output a stable transmission signal independently of the temperature characteristics of an amplitude modulating section. A signal generating section generates an amplitude signal and a phase signal. A regulator supplies a... | 09/01/2009 |
| 7565118 | Polar modulation transmission apparatus and wireless communication apparatus A polar modulation transmission apparatus for realizing a wide control range for transmission power, maintaining the modulation precision and the distortion characteristic at a superb level even at a low output, and providing a high power efficiency is provided. An ... | 07/21/2009 |
| 7496333 | Transmission circuit and communication apparatus employing the same A small-size transmission circuit is provided which outputs a transmission signal having high linearity independently of a magnitude of an output power, and operates with high efficiency. A signal generating section generates quadrature data based on input data. A c... | 02/24/2009 |
| 7457592 | Polar modulation transmission apparatus and wireless communication apparatus Polar modulation transmission apparatus capable of suppressing power loss of a battery supply line to a high-frequency power amplifier regardless of whether transmission power is high or low is provided. Operation control section (120) performing control in s... | 11/25/2008 |
| 7444125 | Communications signal amplifiers having independent power control and amplitude modulation The present invention, generally speaking, provides methods and apparatus for producing an amplitude modulated communications signal, in which a constant-envelope carrier signal is modified in response to a power control signal to produce a modified constant-envelop... | 10/28/2008 |
| 7436308 | Adjusting RFID waveform shape in view of signal from another reader Systems, software, devices, and methods are described for an RFID reader system to communicate with RFID tags. RF energy encountered in conjunction with using a selected channel is detected. The RF energy can be a signal from another RFID reader. The detected signal... | 10/14/2008 |
| 7428407 | Amplitude modulator, in particular for mobile radio, and a method for modulation of a signal An amplitude modulator is provided, which has a first supply connection for supplying a supply potential and a second supply connection for supplying a ground potential. An amplifier stage with a push-pull output stage has a signal input for supplying a signal, and ... | 09/23/2008 |
| 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 |
| 7424276 | Transmitter and wireless communication apparatus using the transmitter In a transmitter of polar-loop architecture having a phase control loop and an amplitude control loop, as loop filters for controlling a loop band of the amplitude control loop, a first filter with lag-lead characteristics (secondary or more filter including a capac... | 09/09/2008 |
| 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 |
| 7395038 | High-efficiency modulating RF amplifier The present invention, generally speaking, provides for high-efficiency power control of a high-efficiency (e.g., hard-limiting or switch-mode) power amplifier in such a manner as to achieve a desired modulation. In one embodiment, the spread between a maximum frequ... | 07/01/2008 |
| 7383028 | Timing adjustment method for wireless communication apparatus The linearity of a transmission signal is improved in a wireless communication device by adjusting a delay difference between paths of two signals that are combined into one after modulation through the paths of different delay amounts, such as an r signal and a θ ... | 06/03/2008 |
| 7383027 | Transmission circuit A transmission circuit capable of transmitting a modulated wave signal using polar modulation in a broad band and with low power consumption is provided. The transmission circuit generates an amplitude signal and a phase signal based on data to be transmitted, and s... | 06/03/2008 |
| 7383025 | Method for processing RF signals for receiving and transmission Methodology for processing of RF signals for receiving and transmission, which varies the frequencies of local oscillators, in order to enable the receivers and transmitters to operate with higher performance in wider or multi-bands. bands. Their integrations into I... | 06/03/2008 |
| 7376396 | Ratiometric transmit path architecture for communication systems A ratiometric transmit path architecture for communication systems and related methods are disclosed. This ratiometric transmit path architecture utilizes a single local oscillator signal and dividers to provide mixing signals for intermediate frequency (IF) mixing ... | 05/20/2008 |
| 7376399 | Weighted mixing circuitry for quadrature processing in communication systems Mixing circuitry for quadrature processing in communication systems and related methods are disclosed. The weighted mixing circuitry allows for arbitrary dividers to be utilized in generating the mixing signals for quadrature processing and thereby provides a signif... | 05/20/2008 |
| 7372831 | Packet transmission acknowledgement in wireless communication system Transmitting an acknowledgement/negative acknowledgement (ACK/NACK) signal in association with a packet transmitted on an uplink is disclosed. The method includes the steps of receiving a packet transmitted from a user equipment, decoding the packet, and determining... | 05/13/2008 |
| 7372908 | Radio communication method, radio transmitting apparatus, and radio receiving apparatus A duplicating section 11 duplicates a bit sequence to be input, and a 16QAM section 121 modulates a bit sequence of a duplicating source to form a symbol, a 16QAM section 122 modulates the duplicated bit sequence to form a symbol, an S/P section... | 05/13/2008 |
| 7369822 | Segmented switching power amplifier A novel transmitter circuit is disclosed for receiving of an input signal and for providing of an amplitude increased RF output signal. Pluralities of switching power amplifiers are disposed along two signal propagating circuit branches and utilized for increasing a... | 05/06/2008 |
| 7369819 | Digital amplitude modulation transmitter with pulse width modulating RF drive A digital amplitude modulation (AM) transmitter with pulse width modulating RF drive is presented. A plurality of RF amplifiers, each, when turned on, amplifies an applied RF drive signal by the same amount to provide a unit step RF output. An encoder supplies turn-... | 05/06/2008 |
| 7365603 | FET amplifier, pulse modulation module, and radar device An FET amplifier includes an FET for amplifying a high-frequency signal to be input to the gate on the basis of a gate bias voltage from a gate bias control circuit. In the FET amplifier, a high-frequency signal input circuit and the output portion of an inverting a... | 04/29/2008 |
| 7366251 | Transmitter for transmitting a combined clock signal and a digital data signal modulated on a carrier wave A transmitter circuit for transmitting a sine wave modulated with digital data, where the sine wave includes a clock signal, and a receiver circuit for demodulating the transmitted sine wave, where the receiver circuit extracts the clock signal and the digital data ... | 04/29/2008 |
| 7366482 | Transmission device, transmission output control method, and radio communications device Either linear operating mode or saturation operating mode is set as the operating mode of a high-frequency power amplifier on the basis of an operating mode set signal. The gain of a variable gain amplifier provided in front of the high-frequency power amplifier and... | 04/29/2008 |
