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| Number | Title | Issue Date |
| 8159309 | Windowing to narrow a bandwidth of an amplitude modulation power supply input signal The present disclosure relates to using windowing to reduce the bandwidth of an amplitude modulation (AM) power supply input signal (PSIS), which is fed to an AM power supply to provide envelope power to an RF power amplifier stage via an AM power supply output sign... | 04/17/2012 |
| 7538632 | Method and apparatus for controlling adaptive circuits A feed-forward amplifier having a signal cancellation loop including a cancellation node that includes a gain controller and a phase controller. Each controller provides a discrete tap steering signal and modulates the corresponding tap steering signal with a discre... | 05/26/2009 |
| 7382887 | Method and device for reducing high frequency error components of a multi-channel modulator A method and device for reducing error components of a multi-channel modulator. The method comprises the steps of inverting substantially half of the channels of a modulator, and reducing error components between said inverted channels and said non inverted channels... | 06/03/2008 |
| 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 |
| 7327202 | Optimization for an IQ modulator An IQ modulator's performance is optimized through determination of suitable control parameters by the application of known DC biases as the I and Q inputs. Also known are the relative amplitude and actual phase of the sine and cosine carriers to be modulated before... | 02/05/2008 |
| 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 |
| 7259630 | Elimination of peak clipping and improved efficiency for RF power amplifiers with a predistorter A predistorer configured for use with an RF power amplifier having an input loop configured to be coupled to the input of the RF power amplifier and peak control circuit. Such an input loop includes a look-up table containing predistortion values to be applied to an... | 08/21/2007 |
| 7224302 | Integrated PM/FM modulator using direct digital frequency synthesis and method therefor A PM/FM modulator (100) includes an analog-to-digital converter (110) having an input terminal for receiving an analog input signal, and an output terminal, and a direct digital frequency synthesizer (120) having an input terminal coupled to the... | 05/29/2007 |
| 7212581 | Up / down conversion circuitry for radio transceiver A multi-channel RF receiver uses an image rejection mixer (e.g. double quadrature mixer) in the IF down conversion stage for image side band rejection (whereby use of an IF narrow band filter for image rejection may be omitted if desired) and comprises a simplified ... | 05/01/2007 |
| 7209717 | Apparatus for radio telecommunication system and method of building up output power A polar loop based radio telecommunication apparatus which has a phase control loop for controlling the phase of a carrier outputted from an oscillator for transmitter, and an amplitude control loop for controlling the amplitude of a transmission output signal outpu... | 04/24/2007 |
| 7187911 | Calibrated PLL for wide band communication semiconductor integrated polar loop transmitter The invention provides a communication semiconductor integrated circuit (RF IC) that, when a transmission oscillator is incorporated into a semiconductor chip, secures the oscillation operation over a wide frequency range, prevents a deterioration of a transmission ... | 03/06/2007 |
| 7103327 | Single side band transmitter having reduced DC offset A single side band transmitter having reduced DC offset includes a current source modulation module, a current mirror module, a 1st mixing module, a 2nd mixing module, a summing module, and a power amplifier. The current source module is operab... | 09/05/2006 |
| 7095799 | Systems and methods for providing baseband-derived predistortion to increase efficiency of transmitters Systems and methods for providing baseband predistortion within a transmitter. In a simplified embodiment, the transmitter contains a main signal path that receives an input signal and generates a main signal in response thereto. A filter in the main signal path is ... | 08/22/2006 |
| 6924711 | Multimode modulator employing a phase lock loop for wireless communications A phase-amplitude modulator for mobile communications employs a phase lock loop as an input to a nonlinear power amplifier providing phase information with amplitude information used to modulate the power amplifier output to synthesize phase-amplitude for the RF tra... | 08/02/2005 |
| 6844788 | Polar loop transmitter A polar loop transmitter circuit arrangement includes a circuit input, a circuit output, a controllable signal source, a modulator connected between the signal source and the output, a first amplifier having its input connected to the circuit input, a second amplifi... | 01/18/2005 |
| 6680658 | Modulation circuit for wireless installation A modulation circuit includes a band restriction filter 2, an attenuator 3, a modulator 4, a reference voltage generator 8, a comparing reference voltage generator 9, a voltage comparator 10 and an attenuator controller 7. The band restriction filter 2 re... | 01/20/2004 |
| 6522213 | SSB transmitter In an SSB transmitter, a problem such that the central frequency of a BPF for extracting one of sideband signals from the modulated signals obtained by modulating a carrier frequency signal by an input sound signal is changed by temperatures, causing a dr... | 02/18/2003 |
| 6501805 | Broadcast transmission system with single correction filter for correcting linear and non-linear distortion In a digital broadcast transmission system (60), a power amplifier (66) amplifies an information signal to a power level suitable to excite an antenna to emit a broadcast signal. Prior to, an subsequent to, the amplification processing circuitry (68, 70) ... | 12/31/2002 |
| 6400415 | System and method for predistorting signals to be amplified A system and method for predistorting a signal which is to be amplified by a non-linear amplifier. The system and method uses additional predistortion circuits to eliminate the predistortion caused by amplifier input circuits and amplifier output circuits... | 06/04/2002 |
| 6373901 | Method and apparatus for conditioning modulated signals using window expansion A modulated signal, having a varying magnitude signal envelope, is conditioned, such as to facilitate amplification (500). Minimum values are determined values for portions of the signal envelope (520, 530), and a window expansion function applied to scal... | 04/16/2002 |
| 6373902 | Device and method for linearizing transmitter in digital communication system A device for linearizing a transmitter in a digital radio communication system. In the device, a predistortion lookup table stores predistortion data determined by measuring in advance distortion characteristics of the transmitter with respect to input ba... | 04/16/2002 |
| 6373346 | Laser driver pre-emphasis and de-emphasis method and/or architecture with tuning and duty cycle control An apparatus comprising a modulator circuit, a first and a second control circuit. The modulator circuit may be configured to generate a modulated differential output signal in response to a differential input signal. The first control circuit may be conf... | 04/16/2002 |
| 6256482 | Power- conserving drive-modulation method for envelope-elimination-and-restoration (EER) transmitters A method and a circuit for high-efficiency linear RF-power amplification over a wide range of amplitudes from zero to peak output includes a final RF-power amplifier operating at or near saturation, an RF driver amplifier, a high-level amplitude modulator... | 07/03/2001 |
| 6236267 | Linearization for power amplifiers using feed-forward and feedback control The present invention is a method and apparatus for linearizing an output signal which is generated by a power amplifier (PA). A phase compensation on the output signal is performed using a phase feed-forward path and a phase feedback path. An amplitude c... | 05/22/2001 |
| 6236284 | RF power amplifier system having distributed modulation encoding An RF power amplifier system is presented herein. It includes a plurality of RF power amplifier modules. At least two encoders are provided. Each encoder is associated with and controls the operation of some of the plurality of power amplifier modules. Ea... | 05/22/2001 |
| 6208217 | Ask modulator with frequency dependent voltage divider An ASK modulator including a switching diode connected in series to a carrier signal transmitting path, a first resistor connected between one end of the switching diode and a digital signal input end and a second resistor connected between one end of the... | 03/27/2001 |
| 6091303 | Method and apparatus for reducing oscillator noise by noise-feedforward A circuit for reducing phase noise in a transmitted radio signal includes a first phase-locked loop circuit including a first controlled oscillator generating a first output signal at a first desired frequency, and a first phase comparator developing a fi... | 07/18/2000 |
| 6078628 | Non-linear constant envelope modulator and transmit architecture A constant envelope modulator and transmit architecture for a wireless communication system is provided and a method for operating the same. The constant envelope modulator includes a differential encoder which receives data to be transmitted and creates ... | 06/20/2000 |
| 5896182 | Amplitude modulator Amplitude modulator comprising a differential input pair receiving a modulating input signal, and a Gilbert cell multiplying a carrier signal by the modulating input signal; and a second differential pair of transistors receiving the carrier signal, and t... | 04/20/1999 |
| 5857001 | Off chip driver with precompensation for cable attenuation A digital data waveform precompensated for off-chip cable attenuation includes peaks with exponential tails at signal transitions. A driver output stage generating the waveform includes an output transistor pulling the output to a peak voltage level when ... | 01/05/1999 |
| 5847619 | Method and system for calibrating a quadrature phase modulator A calibration system for calibrating a quadrature phase modulator comprises a signal generator for generating a pair of sine-wave signals which are quadrature in phase, an adjusting section for adjusting the amplitude and phase of the pair of sine-wave si... | 12/08/1998 |
| 5847623 | Low noise Gilbert Multiplier Cells and quadrature modulators A Gilbert Multiplier Cell includes an emitter-coupled transistor pair and a pair of cross-coupled emitter-coupled transistor pairs. A filter couples the emitter-coupled transistor pair to the pair of the cross-coupled emitter-coupled transistor pairs. The... | 12/08/1998 |
| 5727026 | Method and apparatus for peak suppression using complex scaling values A method of peak suppression includes buffering (401) a plurality of modulation samples, yielding a plurality of buffered samples. A peak sample is determined (403) from among the plurality of buffered samples. A complex scaling value is determined (405).... | 03/10/1998 |
| 5694433 | Efficient linear power amplification A method and apparatus for producing amplified signals for communications having reduced adjacent channel energy involving generating a first signal having an undesired amount of adjacent channel energy, generating a second signal corresponding to the und... | 12/02/1997 |
| 5675611 | Output power control and envelope shaping for a pulsed transmitter Some mobile station cellular networks use either amplitude modulation or constant envelope modulation depending on the situation. The pulsed transmitter of the mobile station is switched on and off by a first control signal (TXP) and the output power enve... | 10/07/1997 |
| 5638403 | Low-splatter peak-to-average signal reduction with interpolation A method of low-splatter peak-to-average reduction for a linear communication system includes the step of sampling (1201) an input signal at a first rate, yielding a plurality of input samples. When at least one (1401, 1403, and 1405) of the plurality of ... | 06/10/1997 |
| 5463357 | Wide-band microwave modulator arrangements A wide-band microwave modulator arrangement for an information transmission system, such as a video signal distribution system, in which signals from a microwave carrier signal source are split and directed over a first path comprising an attenuator and a... | 10/31/1995 |
| 5454013 | Amplitude modulation method and broadcasting apparatus for carrying out the method An amplitude modulation system. An input analog signal indicating audio, etc., is converted into a digital form and the low-order bits of the resultant digital signal are converted into analog form. The resultant analog signal is used to control a gain of... | 09/26/1995 |
| 5450444 | Digital AM transmitter A digital AM transmitter according to the invention converts a audio signal to a digital audio signal of a plurality of bits by an A/D converter, outputs a logical code signal of "1" from each of those output terminals of a code unit, whose number corresp... | 09/12/1995 |
| 5392007 | Modulator having improved encoding A pulse step modulator includes a plurality of N series connected unit step modules each including a DC voltage source having a value V. A plurality of M series connected binary step modules are connected together in series with the series connected unit ... | 02/21/1995 |
