Class / Patent application number | Description | Number of patent applications / Date published |
455196100 | Including variation of local oscillator frequency | 13 |
20090186587 | TUNING A SECOND ORDER INTERCEPT POINT OF A MIXER IN A RECEIVER | 07-23-2009 |
20090197552 | BANDWIDTH TUNABLE MIXER-FILTER USING LO DUTY-CYCLE CONTROL - The present invention relates generally to a bandwidth tunable mixer and more particularly but not exclusively to a mixer having a bandwidth that is tunable in response to a variation in the duty-cycle of a local oscillator. | 08-06-2009 |
20100056089 | Mechanical tuning of a radio - In one implementation, a receiver may have an analog front end with an amplifier to receive a radio frequency (RF) signal and a mixer to downconvert the signal to a baseband signal. Then, a demodulator may receive the baseband signal and obtain an audio signal therefrom. Still further, a controller may be coupled to receive a control signal corresponding to a variable impedance level, and control a local oscillator coupled to the mixer responsive to the control signal. The variable impedance may be controlled by a user to tune to the channel. | 03-04-2010 |
20110053534 | CLOCK GENERATION FOR INTEGRATED RADIO FREQUENCY RECEIVERS - Systems of clock generation for integrated radio frequency receiver. In an integrated radio frequency receiver, a mixer is often used to down convert the incoming radio frequency signal. The down converted signal is then digitized and digital signal processing circuitry is used for efficient and flexible implementation of various functions to receive the underlying audio and/or data information. The mixer requires clock generation circuitry to provide a proper local oscillator signal for a selected channel. On the other hand, the digital signal processing circuitry requires its separate digital clock for proper operations. The clock generation system utilizes single local oscillator generation circuitry to provide the local oscillator signals required by the mixer and the digital clock signals required by the digital signal processing circuitry. In order to maintain a fixed frequency for the digital clock signal regardless channel selection, a fractional divider coupled with sigma-delta circuitry is used to derive the digital clock signal. | 03-03-2011 |
20110081877 | DUAL CONVERSION RECEIVER WITH PROGRAMMABLE INTERMEDIATE FREQUENCY AND CHANNEL SELECTION - A dual conversion receiver architecture that converts a radio frequency signal to produce a programmable intermediate frequency whose channel bandwidth and frequency can be changed using variable low-pass filtering to accommodate multiple standards for television and other wireless standards. The dual conversion receiver uses a two stage frequency translation and continual DC offset removal. The dual conversion receiver can be completely implemented on an integrated circuit with no external adjustments. | 04-07-2011 |
20110136455 | Signal Processing Device and Method - A processing device ( | 06-09-2011 |
20110151813 | MULTI CARRIER LEAKAGE TUNING BY ERROR POWER DETECTION - A communication device and method of removing an LO leakage signal from a signal path on the fly is disclosed. The signal path may be that of a transmitter or receiver. An initial RF output signal, containing a desired RF output signal and an LO leakage signal, is supplied from a feedforward path to a combiner/splitter on a feedback path. A 180° out-of-phase copy of the desired RF output signal is also supplied to the combiner/splitter. The resulting LO leakage signal is down-converted and the power of the down-converted signal determined and used to suppress the LO leakage signal. The resulting LO leakage signal is also supplied to the feedforward path of the feedback loop. | 06-23-2011 |
20110212698 | SYSTEM AND METHOD FOR ADAPTIVE RADIO FREQUENCY FILTERING - A system and method provide adaptive filtering of radio frequency (RF) signals. Multiple signals are received in a predetermined RF spectrum, the signals including a desired signal and multiple potentially interfering signals. A first signal of the potentially interfering signals is down-converted to a baseband signal, and a power of the baseband signal is determined. When the power exceeds a predetermined threshold power, a first notch filter, corresponding to a frequency of the first signal, is activated. | 09-01-2011 |
20130288627 | Method And Apparatus For Controlling A Harmonic Rejection Mixer - In one embodiment, the present invention includes a method for receiving a radio frequency (RF) signal and mixing the RF signal with a master clock to obtain a mixed signal, cyclically rotating the mixed signal to each of N gain stages for at least one cycle of the master clock, and summing the outputs of the N gain stages to provide an output signal. | 10-31-2013 |
20150372704 | RECEPTION DEVICE AND ELECTRONIC APPARATUS - There is provided a reception device including first and second reception circuits configured to receive transmission signals, a first oscillation circuit configured to generate a differential signal having a predetermined frequency on the basis of an oscillation signal acquired from a connected crystal oscillator, and to supply the generated differential signal to the first reception circuit as a reference frequency signal, and a second oscillation circuit configured to be supplied with an oscillation signal having one of phases in the differential signal acquired by the first oscillation circuit, to generate a differential signal having a predetermined frequency on the basis of the supplied oscillation signal, and to supply the generated differential signal to the second reception circuit as a reference frequency signal. | 12-24-2015 |
455197100 | By simultaneous control with signal selection | 3 |
455197200 | Variable capacitor tuned | 2 |
455197300 | Including additional tuning circuit | 2 |
20140378077 | DOWN-CONVERSION CIRCUIT - A down-conversion circuit for a receiver circuit is disclosed, the down-conversion circuit comprises a first passive switching mixer arranged to down-convert a received radio frequency, RF, signal with a first local oscillator, LO, signal (LO | 12-25-2014 |
20150147992 | INTEGRATED RECEIVER AND INTEGRATED CIRCUIT HAVING INTEGRATED INDUCTORS AND METHOD THEREFOR - In one form, an integrated receiver includes a tracking bandpass filter, a tunable lowpass filter, and a mixer formed on a single integrated circuit chip. The tracking bandpass filter has an input for receiving a radio frequency (RF) input signal, and an output, and comprises a variable capacitor having a capacitance that varies in response to a bandpass frequency control signal, in parallel with an integrated inductor. The integrated inductor comprises a plurality of windings formed in a plurality of metal layers. The tunable lowpass filter has an input coupled to the output of the tracking bandpass filter, and an output and having a tuning input for receiving a cutoff frequency signal. The mixer has a signal input coupled to the output of the tunable lowpass filter, a local oscillator input for receiving a local oscillator signal, and a signal output for providing a converted RF signal. | 05-28-2015 |
455199100 | Discrete frequency types (e.g., channel switching) | 1 |
20140024326 | RECEIVING APPARATUS AND RECEIVING METHOD - A first high frequency processing unit detects a first broadcasting wave transmitted using a first frequency band, and extracts a first high frequency signal. Further, a second high frequency processing unit detects a second broadcasting wave transmitted using a second frequency band different from the first frequency band, and extracts a second high frequency signal. Furthermore, at least one local oscillator generates a local oscillation signal used in the first high frequency processing unit and the second high frequency processing unit. | 01-23-2014 |