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| Number | Title | Issue Date |
| 8190108 | Method and system for frequency up-conversion A method and system is described wherein a signal with a lower frequency is up-converted to a higher frequency. In one embodiment, the higher frequency signal is used as a stable frequency and phase reference. In another embodiment, the invention is used as a transm... | 05/29/2012 |
| 8185067 | Modulation method and apparatus A modulation circuit for use in a radiofrequency transmitter includes a local oscillator circuit configured to generate one or more local oscillator signals at a desired frequency and with a duty cycle at or about twenty-five percent, and a modulator configured to g... | 05/22/2012 |
| 8175552 | Filter circuit, wireless transmitter, and wireless receiver A filter circuit is constructed of a passive mixer and a frequency response device. The passive mixer generates a frequency-converted signal by mixing an input signal transmitted through a transmission line and a local oscillation signal, and outputs the frequency-c... | 05/08/2012 |
| 8165541 | Radio transmitter for modulating a carrier wave A radio transmitter for modulating a carrier wave in a predetermined frequency with given information to transmit the modulation signal through an antenna having a predetermined resonance frequency f1 has a frequency changing section that changes the frequenc... | 04/24/2012 |
| 8160516 | Low flicker noise active mixer and method thereof A low flicker noise active mixer comprises a trans-conductance section, a switching quad, and a load section. The trans-conductance section converts a voltage signal pair into a first current signal pair. The switching quad converts the first current signal pair int... | 04/17/2012 |
| 8145155 | Passive mixer and high Q RF filter using a passive mixer A passive mixer include a switching architecture configured to generate differential in-phase (I) and differential quadrature-phase (Q) signals using differential components of the in-phase (I) and quadrature-phase (Q) signals operating on transitions of an approxim... | 03/27/2012 |
| 8055218 | Wireless transmitter circuit and transceiver using the same This invention provides a wireless transmitter circuit for mobile communication apparatus and this circuit can be configured with fewer components and is suitable for downsizing. A single PLL synthesizer serves as both RF frequency band PLL and IF frequency band PLL... | 11/08/2011 |
| 8045938 | Discrete filter, sampling mixer, and radio device Provided is a discrete filter capable of increasing degree of freedom of design including a DC gain. A sampling mixer (100) includes: a control signal generation unit (104) which generates a control signal including an SO signal; a Ch (6) which ... | 10/25/2011 |
| 8041314 | Signal amplifier structure for radio transmitter There is provided a modular amplifier structure that includes a plurality of parallel amplifier sub-units. Each amplifier sub-unit is configured to amplify a received payload signal under control of at least one received control signal. Outputs of the amplifier sub-... | 10/18/2011 |
| 8036611 | Polar transmitter, method and apparatus for phase modulation A phase modulation method with a polar transmitter. A target frequency is first designated by comparing the RF signal with a reference frequency and the phase sample. An oscillator control word is generated based on the target frequency. A digital oscillator can mod... | 10/11/2011 |
| 8032094 | Discrete filter, sampling mixer, and radio device Provided is a discrete filter capable of adjusting the number of notches and the notch frequency and easily eliminating a particular frequency component. In a sampling mixer (100), a control signal generation unit (104) generates a plurality of control... | 10/04/2011 |
| 8019291 | Method and system for frequency down-conversion and frequency up-conversion A method and system is described wherein a signal with a lower frequency is up-converted to a higher frequency. In one embodiment, the higher frequency signal is used as a stable frequency and phase reference. In another embodiment, the invention is used as a transm... | 09/13/2011 |
| 7991368 | Integrated RF-IF converter A frequency conversion apparatus includes a frequency generation circuit, which is based on a first semiconductor material having a first elemental composition and is coupled to generate one or more Local Oscillator (LO) signals. The apparatus further includes a con... | 08/02/2011 |
| 7986926 | Integrating an FM transmitter into a cellular telephone A system includes a cellular radio and an FM transmitter that are fabricated in the same semiconductor. The FM transmitter includes at least one mixer, a filter and an antenna tuning network. The mixer(s) translate an intermediate carrier frequency of an input signa... | 07/26/2011 |
| 7912429 | LO 2LO upconverter for an in-phase/quadrature-phase (I/Q) modulator An upconverter includes a switching architecture configured to receive an input signal, a first local oscillator (LO) signal, and a second local oscillator (2LO) signal that is at a frequency that is twice a frequency of the local oscillator (LO) signal, wherein the... | 03/22/2011 |
| 7904036 | Modulation method and apparatus A modulation circuit for use in a radiofrequency transmitter includes a local oscillator circuit configured to generate one or more local oscillator signals at a desired frequency and with a duty cycle at or about twenty-five percent, and a modulator configured to g... | 03/08/2011 |
| 7904037 | Adaptive radio transceiver with offset PLL with subsampling mixers An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 03/08/2011 |
| 7877065 | Signal processing circuit and communication device using the same A signal processing circuit having a modulator having frequency conversion circuits, each having a local oscillator and a mixer. The circuit multiplies a signal having a first frequency and a local oscillation signal from the local oscillator at the mixer to convert... | 01/25/2011 |
| 7840195 | Multifunction-RF-circuit A multifunction RF circuit on a single semiconductor chip. The multifunction RF circuit includes a power amplifier circuit, a mixer circuit forming an integral part of the power amplifier circuit and a low-pass filter circuit. The power amplifier circuit may include... | 11/23/2010 |
| 7831224 | Radio-frequency IC for a mobile radio transmitter A radio-frequency IC (3) for a mobile radio transmitter (1) has an analogue/digital converter unit (5) for digitizing baseband signals (AB), a recovery unit (6, 7, 8, 9, 10) for recovering determined data information (Rot, TxSymbPhase) on... | 11/09/2010 |
| 7792504 | Transmitter and transceiver, in particular for mobile radio, and transmission method A receiver, in particular for mobile radio, includes a receiver branch with a mixer, downstream of an analog/digital converter. A reference generator generates a reference clock, which is fed to the converters or PLL synthesizers of the mixer by integral multiplicat... | 09/07/2010 |
| 7792503 | High frequency module A high frequency module includes: a line substrate having a first high-frequency signal line on a first surface thereof and a second high-frequency signal line on a second surface being a surface on the opposite side of the first surface, the second high-frequency s... | 09/07/2010 |
| 7738844 | Radio communication device A radio communication device includes: a local oscillator; an amplifier amplifying an output signal of the local oscillator and outputting a local oscillation frequency and a harmonic wave component thereof; and a harmonic mixer receiving an output signal of the amp... | 06/15/2010 |
| RE41207 | Fully integrated ALL- CMOS AM transmitter with automatic antenna tuning A monolithic AM transmitter is disclosed. An external antenna forms part of a resonance network so that the antenna resonance point is automatically tuned to the transmit frequency. This provides flexibility with no added cost to the transmitter. ... | 04/06/2010 |
| 7620378 | Method and system for frequency up-conversion with modulation embodiments A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In ... | 11/17/2009 |
| 7555271 | Single side band transmissions A method for single side band transmissions begins by mixing, in a current domain, an in-phase component of outbound formatted data with an in-phase component of a local oscillation to produce a first mixed signal. The method continues by mixing, in the current doma... | 06/30/2009 |
| 7546096 | Frequency up-conversion using a harmonic generation and extraction module A method and system is described wherein a signal with a lower frequency is up-converted to a higher frequency. In one embodiment, the higher frequency signal is used as a stable frequency and phase reference. In another embodiment, the invention is used as a transm... | 06/09/2009 |
| 7542739 | Up converter mixer linearization improvement An up conversion mixer has a Gilbert cell arrangement including an input amplification part for producing an amplified signal coupled to a multiplication part, the multiplication part being arranged to multiply the amplified signal by a local oscillator signal and o... | 06/02/2009 |
| 7512385 | GPS RF front end IC with programmable frequency synthesizer for use in wireless phones A GPS RF Front End IC containing a Programmable Frequency Synthesizer is disclosed. The GPS RF front end IC having a programmable frequency synthesizer allows a relatively fixed internal frequency plan while able to use a number of different reference frequencies pr... | 03/31/2009 |
| 7499680 | Translational loop transmitter architecture employing channel power ratio measurements for modulation accuracy calibration A Radio Frequency RF transmitter includes a translational loop architecture that supports non-constant envelope modulation types and includes by adjusting the envelope of the translational loop at the translational loop output. The RF transmitter includes an Interme... | 03/03/2009 |
| 7463868 | Adaptive radio transceiver with offset PLL with subsampling mixers An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 12/09/2008 |
| 7439895 | Linear amplifier using digital feedforward A signal amplification system including a plurality of digital signal inputs coupled to a signal combination devices, wherein each of the plurality of digital signal inputs correspond to a separate digital signal, a signal conversion device coupled to the signal com... | 10/21/2008 |
| 7440732 | Apparatus and method of local oscillator leakage cancellation A transmitter includes a first mixer to generate a first output signal by up-converting a first baseband signal having a first DC offset component. A second mixer generates a second output signal by up-converting a second baseband signal having a second DC offset co... | 10/21/2008 |
| 7428308 | Transmitting and reproducing stereophonic audio signals Apparatus and method for transmitting and reproducing stereophonic audio signals are disclosed. The method comprises splitting first and second channels into two frequency bands, combining the lower frequency band signals of the two channels, and transmitting the co... | 09/23/2008 |
| 7424274 | Digital transmitter and method A transmitter and method is provided for digitally upconverting a baseband digital signal to a modulated intermediate frequency (IF) digital signal and sigma-delta modulating the IF digital signal. The baseband digital signal is split into N phases, as can be accomp... | 09/09/2008 |
| 7424064 | Polar transmitter with digital to RF converter A polar transmitter, operable in linear mode or switched mode, uses a conversion module to convert baseband signals into amplitude data and phase data. The phase data is used to phase modulate a carrier frequency in a radio frequency conversion module. The module co... | 09/09/2008 |
| 7421250 | Radio frequency integrated circuit A radio frequency (RF) integrated circuit (IC) includes a local oscillation module, analog radio receiver, analog radio transmitter, digital receiver module, digital transmitter module, and digital optimization module. The local oscillation module is operably couple... | 09/02/2008 |
| 7409192 | Method and apparatus for frequency synthesis in direct-conversion transmitters A method and apparatus for direct-conversion transmission generates a first frequency signal that is non-harmonically related to a transmit frequency signal, divides the first frequency signal to obtain a mixing frequency signal, divides the first frequency signal t... | 08/05/2008 |
| 7409196 | RFIC transmit power control An RFIC transmitter includes a digital transmit processing module, a digital to analog converter, a filter and gain module, an up-conversion module, a power amplifier, and a transmit signal strength module. The transmit signal strength module is coupled to generate ... | 08/05/2008 |
| 7398074 | Integrated transceiver circuit with low interference production and sensitivity An integrated transceiver circuit has a reception path, which in turn has a mixer unit for demodulation of a received signal. An analog/digital converter unit is connected in the reception path downstream from the mixer unit. A first frequency divider is connected b... | 07/08/2008 |
