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| Number | Title | Issue Date |
| 7949072 | Local oscillator with injection pulling suppression and spurious products filtering A single sideband mixer circuit includes a voltage controlled oscillator operable a tunable frequency f1. The mixer circuit outputs a frequency signal at a frequency f1±f2. A tracking filter operates to filter the frequency signal and generate ... | 05/24/2011 |
| 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 |
| 7308240 | Numerical control oscillator, digital frequency converter and radio frequency unit A numerical control oscillator (NCO) for reducing a circuit size and power consumption while maintaining a desired frequency deviation, and suppressing generation of a spurious as much as possible. The NCO comprises a phase accumulator for accumulating input phase d... | 12/11/2007 |
| 7272170 | Single oscillator transceiver A frequency plan is provided for particular use in a transceiver. Advantageously, a single oscillator may be used to generate desired frequency signal. One or more power splitters receive the signal and equally divide the signal into first and second signals having ... | 09/18/2007 |
| 7236765 | Data communication over power lines A system for receiving and processing signals received from a plurality of endpoints. Each endpoint includes an endpoint transmitter in electrical communication with a power distribution line within a power distribution system. The system comprises a power line coup... | 06/26/2007 |
| 7180412 | Power line communication system having time server A system for bi-directional power distribution line communication. The system is configured for data communication with an endpoint transceiver located at a customer premise. The system comprises a time server in electrical communication with the transceiver, the ti... | 02/20/2007 |
| 7145438 | Endpoint event processing system An endpoint processor includes a processor block, a timer block, a memory block, and analog-to-digital converter. The timer block is arranged to provide a time based signal to the processor block. The memory block cooperates with the processor block. The analog-to-d... | 12/05/2006 |
| 7116706 | Single oscillator transceiver frequency plan A frequency plan is provided for particular use in a transceiver. Advantageously, a single oscillator may be used to generate desired frequency signals. One or more power splitters receive the signal and equally divide the signal into first and second signals having... | 10/03/2006 |
| 7057543 | Low power method and interface for generating analog waveforms A low power analog output circuit is disclosed that utilizes a low pass filter driven by a bit stream to render a waveshaped output signal based upon a raw digital data signal. The analog output circuit includes sequential bit pattern selection logic that receives a... | 06/06/2006 |
| 6996165 | Single oscillator transceiver frequency plan A frequency plan is provided for particular use in a transceiver. Advantageously, a single oscillator may be used to generate desired frequency signal. One or more power splitters receive the signal and equally divide the signal into first and second signals having ... | 02/07/2006 |
| 6977980 | Timing synchronization methods and systems for transmit parallel interfaces Transmit parallel interfaces and methods are provided in which a clock signal is generated that maximizes the setup and hold window of input data. In at least some embodiments, a divider circuit provides a clock signal in one clock domain that has a rising edge loca... | 12/20/2005 |
| 6944250 | Variable rate modulator Digital data signals at a variable input frequency are converted by a numerically controlled oscillator and an interpolator to a signal at a fixed output sampling frequency. The conversion of the variable input frequency to the fixed output sampling frequency may be... | 09/13/2005 |
| 6677862 | Transmitter tolerant to crystal variations A transmitter to transmit data from an end-point includes a reference oscillator; a low pass filter coupled to the reference oscillator; a modulation filter to provide an over-sampled modulated signal; a synthesizer coupled to the low pass filter and the ... | 01/13/2004 |
| 6674334 | Oscillator having surface acoustic wave resonator and oscillation circuit An oscillator is provided that can be flexibly retrofitted to become usable for a wide range of applications, that is compatible with different users'requests, and that enables a user to design a high-frequency unit using the oscillator without concerns. ... | 01/06/2004 |
| 6674823 | Variable rate modulator Digital data signals at a variable input frequency are converted by a numerically controlled oscillator and an interpolator to a signal at a fixed output sampling frequency. The conversion of the variable input frequency to the fixed output sampling frequ... | 01/06/2004 |
| 6546060 | Direct modulating FSK transmitter for MCA A direct modulating frequency shift keying transmitter for multi channel access is constructed so that a transmission signal from a voltage controlled oscillator (VCO) in a phase lock loop frequency synthesizer is output through a buffer amplifier and a t... | 04/08/2003 |
| 6498823 | Variable rate modulator Digital data signals at a variable input frequency are converted by a numerically controlled oscillator and an interpolator to a signal at a fixed output sampling frequency. The conversion of the variable input frequency to the fixed output sampling frequ... | 12/24/2002 |
| 6434187 | Digital radiofrequency transceiver A method for radiofrequency (RF) transmission of digital information includes generating an RF signal using a voltage-controlled oscillator (VCO), stabilizing the RF signal from the VCO by providing an error signal from a phase-locked loop (PLL) to an inp... | 08/13/2002 |
| 6434135 | Adaptive RF amplifier prelimiter The invention reduces transient peaks in signals transmitted in CDMA communication systems. A plurality of spread spectrum data signals are combined into a combined signal having fluctuating power level corresponding to the combination of the data signals... | 08/13/2002 |
| 6392499 | Frequency shift modulation circuit A frequency shift modulation circuit has a direct digital synthesizer DDS and a phase-locked loop PLL. DDS stores output signal frequency data in a plurality of registers. DDS selects the register storing the frequency data in accordance with a frequency ... | 05/21/2002 |
| 6385256 | Method and arrangement for signal modulation The invention relates to a method and arrangement for modulating a signal to be transmitted, the arrangement comprising an encoder and a frequency modulator. In order to enable high rate transmission in a flexible manner in a narrow frequency band, the en... | 05/07/2002 |
| 6317009 | Frequency shift key modulating oscillator The present invention teaches a system for selectably oscillating at a first or a second oscillating frequency. The system comprises an oscillator for providing an oscillating output. Moreover, the system comprises a switching device for selecting a first... | 11/13/2001 |
| 6298093 | Apparatus and method for phase and frequency digital modulation Apparatus for phase/frequency digital modulation includes a digital circuit receiving and processing a digital modulation input signal to generate a digital modulation control signal, a digital-to-analog converter coupled to the digital circuit converts t... | 10/02/2001 |
| 6288618 | Logic-based architecture for FSK modulation and demodulation A cost-effective continuous phase logic-based modulator and demodulator are provided to allow communications using binary frequency shift keying (BFSK) as well as M-ary FSK techniques. The modulator of the 1-bit precision modem architecture is based on a ... | 09/11/2001 |
| 6275539 | System and method for modulating a frequency signal A radio frequency transmitter circuit including a user input switch for producing an input signal, an oscillator for producing a frequency signal having a first frequency, an antenna connected to the oscillator for broadcasting the frequency signal, a cou... | 08/14/2001 |
| 6265948 | Image rejection in logic-based architecture for FSK modulation and demodulation A cost-effective continuous phase logic-based modulator and demodulator are provided to allow communications using binary frequency shift keying (BFSK) as well as M-ary FSK techniques. The modulator of the 1-bit precision modem architecture is based on a ... | 07/24/2001 |
| 6225873 | Frequency shift key modulating oscillator The present invention teaches a system for selectably oscillating at a first or a second oscillating frequency. The system comprises an oscillator for providing an oscillating output. Moreover, the system comprises a switching device for selecting a first... | 05/01/2001 |
| 6163229 | Frequency generator for generating two independent FSK signals A frequency generating circuit scales a warp range of a frequency signal. The frequency generating circuit includes a first frequency signal (10) having a first offset signal with a first frequency relationship to the first frequency signal, and a second ... | 12/19/2000 |
| 6133804 | Transmitter with complex phase comparator A transmitter in which a complex low IF digitised signal is applied in quadrature to a complex phase comparator together with a digitised frequency down-converted version of an analogue signal produced by a transmitter VCO. The low IF digitised signal ser... | 10/17/2000 |
| 6018275 | Phase locked loop with down-conversion in feedback path A transmitter and a phase locked loop (30) for a transmitter are disclosed. The phase locked loop (30) upconverts the frequency of a baseband signal to a frequency for radio transmission. As well as the usual components, the phase locked loop (30) compris... | 01/25/2000 |
| 5926093 | Drive circuit for reactive loads A highly efficient resonant switching driver circuit includes a matching reactance coupled between an output resonant circuit and a driver circuit. The matching reactance performs a series to parallel impedance match from the driver circuit to the output ... | 07/20/1999 |
| 5889443 | Frequency synthesizing circuit using a phase-locked loop A frequency synthesizing circuit has an input on which a bit flow is received, and an output on which a data-modulated output signal is supplied. The circuit moreover comprises a crystal oscillator supplying a reference clock signal, a phase-locked loop (... | 03/30/1999 |
| 5883922 | FSK communication device for digital information A communication device (1) for computer local networks of the cordless type uses a modulator (MOD) able to perform FSK modulation on the data (DDI) to be transmitted, with optimum characteristics thanks to a digital switch (SW) controlled by the data (DDI... | 03/16/1999 |
| 5818880 | MMIC telemetry transmitter A telemetry transmitter having a dielectric resonator for frequency stabilization, a frequency or phase shift keying modulator and a high efficiency power amplifier. The transmitter can be implemented on gallium arsenide or other kinds of substrates The t... | 10/06/1998 |
| 5793261 | Saw stabilized FSK oscillator circuit A digitally-controlled SAW stabilized FSK oscillator circuit having an oscillator and a single-port SAW resonator with a predetermined circuit resonant frequency and being coupled to the oscillator for establishing a first oscillator output frequency, F | 08/11/1998 |
| 5789991 | FSK modulating and demodulating apparatus wherein each binary data is represented by same number of cycles of modulated signal A signal FSK-modulated with a binary data signal has first signal portions representing first logical level data contained in the binary data signal and second signal portions representing second logical level data contained in the binary data signal. Eac... | 08/04/1998 |
| 5732106 | Pulse-shaping filter for modulator monolithic integration Disclosed is a digital pulse shaping circuit for reducing undesirable frequency components in subsequent data modulated transmissions, which circuit can be easily manufactured as a monolithic integrated circuit. In a preferred embodiment, the pulse shapin... | 03/24/1998 |
| 5612650 | Transmitting device for a frequency modulated digital transmission signal A microcomputer includes therein an operation control part which can be operated when a clock signal is applied thereto by an oscillation circuit. If the operation control part reads out an identification code from an EEPROM, then it switches a control si... | 03/18/1997 |
| 5532654 | FSK modulator using saw resonator with switchable capacitors An FSK modulator including an amplifier for oscillation has a surface acoustic wave resonator connected in series with a switching circuit formed without a variable-capacity diode but including a semiconductor switch and one or more fixed-capacity capacit... | 07/02/1996 |
| 5485129 | Method and apparatus for digital modulation using pulse deletion An apparatus (500) for generating first and second output signals having predetermined frequency shifts relative to a frequency provided by a reference signal is included in a system comprising a phase-locked loop (206) coupled to the reference signal for... | 01/16/1996 |
