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| Number | Title | Issue Date |
| 8190115 | Transmission line coupled to circuits and Q-enhancement cell Various example embodiments are disclosed. According to an example embodiment, an apparatus may comprise a first circuit, a second circuit, a transmission line coupled between the first circuit and the second circuit, and a Q-enhancement cell coupled to the transmis... | 05/29/2012 |
| 8190114 | Frequency-dependent filtering for wireless communications transmitters A method of transmitting information in a wireless communications system can be provided by selectively applying filtering to transmission of a carrier signal of a first band of frequencies of a wireless communications system based on a frequency separation distance... | 05/29/2012 |
| 8185081 | High linearity tunable bandpass filter A tunable bandpass filter (10) is provided. An RF signal is provided at an input of the tunable bandpass filter, and a level shifted control signal (V1, V2) inputted to the tunable bandpass filter (10) switches a first arrangement and a s... | 05/22/2012 |
| 8170521 | Method and apparatus for sampling RF signals The invention provides a method and apparatus used in a receiver for sampling RF signals, particularly to provide a method and apparatus for greatly decrease the sampling rate performed in RF band. The invention provides an apparatus for sampling a RF signal includi... | 05/01/2012 |
| 8165555 | Method and apparatus for filtering Aspects of the disclosure can provide a second order low pass filter. The second order low pass filter can work in current domain, and have high linearity for in-band signals and out-of-band signals. The second order low pass filter can include a MOS transistor havi... | 04/24/2012 |
| 8150357 | Smoothing filter for irregular update intervals A technique for determining a received signal strength from multiple messages filters noise from the received signal to provide an accurate signal strength value. Advantageously, the more accurate output signal strength value can be used to identify movement of a st... | 04/03/2012 |
| 8145175 | Sampling filter apparatus The sampling filter apparatus 100 includes the first sampling switch 130, the second sampling switch 131, the first integrator 1500 for integrating the charge input from the first sampling switch, the second integrator 1501 for int... | 03/27/2012 |
| 8131246 | High-frequency circuit having filtering function and reception device A high-frequency circuit includes a dielectric substrate, a stripline formed on a surface of the dielectric substrate, a ground conductor provided on a back surface of the dielectric substrate, in which a pattern cut-out portion through which a part of the back surf... | 03/06/2012 |
| 8131247 | Method and system for an intermediate frequency (IF) channel select filter with an integrated alternate adjacent channel interference (AACI) filter An alternate adjacent channel interference (AACI) filter is integrated into an intermediate frequency (IF) channel select filter to filter received RF signals. The IF channel select filter is an IF staged structure comprising successive IF stages. Each of the succes... | 03/06/2012 |
| 8116715 | Filter circuit and communication semiconductor device using the same The present invention intends to provide a filter circuit in which an area occupied by the circuit can be reduced by suppressing the scale of its circuit configuration while a predetermined vicinity disturbance wave rejection ratio is maintained and a communication ... | 02/14/2012 |
| 8041327 | Wideband resistive input mixer with noise-cancelled impedance A radio frequency (RF) mixing circuit including a quadrature mixer that receives non-overlapping in-phase and quadrature local oscillator (LO) signals, and a plurality of low noise amplifiers (LNAs) operatively connected to the quadrature mixer, the plurality of LNA... | 10/18/2011 |
| 8036624 | Off-line channel tuning amplitude slope matched filter architecture A tuning control system and associated method is provided for continuously and automatically tuning a lobed amplitude slope matching filter (ASMF) to a band center of an interfering signal to provide improved rejection of an interfering signal coupled from a transmi... | 10/11/2011 |
| 8032103 | Tuning amplitude slope matched filter architecture A tuning control system and associated method is provided for continuously and automatically tuning a lobed amplitude slope matching filter (ASMF) to a band center of an interfering signal to provide improved rejection of an interfering signal coupled from a transmi... | 10/04/2011 |
| 8023921 | Quadratic amplitude control circuit for cosite interference cancellation A quadratic amplitude matching system and associated method with an associated tuning control system is provided for continuously and automatically tuning a quadratic amplitude matching filter (QAMF) to a band center of an interfering signal to provide improved reje... | 09/20/2011 |
| 8019308 | Receiving apparatus A receiving apparatus 10 includes a stereo blend control unit 21 for carrying out a stereo blend process according to the reception state of a broadcast wave, a pilot detecting unit 18 for detecting a pilot signal included in the broadcast wave,... | 09/13/2011 |
| 7986932 | Fixed point FIR filter with adaptive truncation and clipping and wireless mobile station using same A fixed point finite impulse response (FIR) filter comprising: 1) an input stage for receiving an input signal as a sequence of input samples comprising: i) delay elements connected in series for receiving and shifting N sequential input samples; ii) multipliers, ea... | 07/26/2011 |
| 7941119 | Signal processing method and apparatus in digital broadcasting apparatus of wireless terminal An apparatus and method for processing a digital broadcast signal are provided. The method includes cutting off a noise frequency of a received digital broadcast signal and low-noise amplifying the noise cut-off signal, limiting an amplitude of the low-noise amplifi... | 05/10/2011 |
| 7937058 | Controlling the bandwidth of an analog filter A digital tuning system (250) for changing a cutoff frequency of an analog filter (132) includes digital synthesizers (292 and 294) for producing a two-tone calibration signal (196) applied to an input of the filter after a quality... | 05/03/2011 |
| 7933575 | Circuit for settling DC offset in direct conversion receiver The present invention discloses a circuit for settling DC offset and controlling RC time-constant in a direct conversion receiver. The circuit includes a variable resistive unit for providing a continuously or non-continuously variable resistance in the direct conve... | 04/26/2011 |
| 7917118 | Receiver apparatus and method of processing received signal which attain optimum SNR A receiver apparatus includes a band-pass filter having a variable frequency band coupled to a node for receiving a received signal including a plurality of channels to output at an output node thereof a limited-band signal made by limiting a frequency band of the r... | 03/29/2011 |
| 7904048 | Multi-tap direct sub-sampling mixing system for wireless receivers A multi-tap direct sub-sampling mixing system for wireless receivers is provided with a dynamically configurable passive switched capacitor filter. A front end amplifier is connected to receive a signal. The passive switched capacitor filter is connected to receive ... | 03/08/2011 |
| 7899428 | Radio receiver and radio receiver front-end A radio receiver front-end includes first and second RF receiver sections and an RF combining module. The first RF receiver section is coupled to receive an inbound RF signal and provide to a first representation of the inbound RF signal, wherein the inbound RF sign... | 03/01/2011 |
| 7885629 | Circuit with Q-enhancement cell having programmable bias current slope Various embodiments are disclosed relating to Q-enhancement cells. According to an example embodiment, a circuit may include an inductor with a quality factor (Q), and a Q-enhancement cell coupled to the inductor. The Q-enhancement cell may include a current source ... | 02/08/2011 |
| 7881690 | System and method for zero intermediate frequency filtering of information communicated in wireless networks A circuit for communicating information in a wireless network includes a filtering circuit in communication with a zero intermediate frequency (ZIF) transceiver circuit. The filtering circuit includes a first mixer in communication with an output of the ZIF transcei... | 02/01/2011 |
| 7865163 | Time constant automatic adjusting circuit, filter circuit system, and method of automatically adjusting time constant A time constant automatic adjusting circuit comprises: a filter circuit varying a phase of an clock signal to be input so as to output the clock signal; a phase comparison circuit comparing a phase of an output signal of the filter circuit with the phase of the cloc... | 01/04/2011 |
| 7860479 | FM receiver An FM receiver that is suitable for reducing a transmission bandwidth WF of a bandpass filter to remove adjacent-channel interference, and increasing WF to prevent audio distortion. A detection output signal SOUT is inputted to an HP... | 12/28/2010 |
| 7860478 | Poly-phase filter Provided is a poly-phase filter capable of removing an image frequency of a terrestrial digital multimedia broadcasting (T-DMB) receiver in a low intermediate frequency (IF) structure applied to a mobile communication terminal and a receiver having the poly-phase fi... | 12/28/2010 |
| 7860477 | Self-calibrating filter Techniques for self-calibrating filtering circuits with feedback are described herein. ... | 12/28/2010 |
| 7848726 | High-frequency receiver and adjacent interference wave reducing method A high-frequency receiver alleviates an influence of adjacent interference waves in a location where an identical set of broadcast channels can be received with different broadcast waves which are broadcast or relayed in frequency bands different from one another by... | 12/07/2010 |
| 7813710 | Receiving circuit The present invention is a receiving circuit used for a cellular phone that is reduced in size and can realize low power consumption. In a signal reception circuit that is used in a cellular phone that perform transmission and reception of a plurality of band wirele... | 10/12/2010 |
| 7756502 | High-frequency IC and GPS receiver The high-frequency IC according to an embodiment of the invention includes a mixer down-converting the RF signal into an IF signal with a given center frequency lower than that of the RF signal, a first-order low-pass filter with a pass band set narrower than a band... | 07/13/2010 |
| 7715815 | Integrated tracking filters for direct conversion and low-IF single conversion broadband filters A radio frequency (RF) tuner includes a programmable tracking filter bank receiving an RF input and outputting a filtered RF signal. A mixer stage receives the filtered RF signal and outputs a first quadrature component of the filtered RF signal and a second quadrat... | 05/11/2010 |
| 7689193 | Self-aligning resonator filter circuits An embodiment of a self-aligning resonator filter circuit includes a tunable resonator having a filter output node, an oscillator having an oscillator output node, a resistance element connected between the oscillator output node and the filter output node when the ... | 03/30/2010 |
| 7676211 | Reconfigurable baseband filter A reconfigurable baseband filter for use in a multimode communication system is disclosed. One or more filter elements can each be configured as a plurality of sub-elements. The value of each of the filter elements can be varied by switching between at least two of ... | 03/09/2010 |
| 7672657 | Tunable filter apparatus, systems, and methods Embodiments of an active bandpass filter are described. Such a filter includes a transistor; a series-tuned inductive-capacitive (LC) network (STLCN) in a common source circuit associated with the transistor to produce a tuned degenerative filtering of at least one ... | 03/02/2010 |
| 7640001 | System and method for providing distributed gain A system for filtering a signal includes a plurality of filter modules coupled in series. Each filter module includes a filter and a variable gain element. Each filter is capable of. receiving an input signal, attenuating a portion of the input signal that is outsid... | 12/29/2009 |
| 7623837 | Receiver for an integrated heterodyne communication system including BAW-type resonators A heterodyne receiving circuit for a digital communication system including a first band pass filter receiving a signal from an antenna, an amplifying circuit and a second narrow band pass filter for selecting one particular channel within a band of frequencies. The... | 11/24/2009 |
| 7583948 | Time constant automatic adjusting circuit, filter circuit system, and method of automatically adjusting time constant A time constant automatic adjusting circuit comprises: a filter circuit varying a phase of an clock signal to be input so as to output the clock signal; a phase comparison circuit comparing a phase of an output signal of the filter circuit with the phase of the cloc... | 09/01/2009 |
| 7561865 | System and method for determining a resonant frequency in a communications device A communications device including communications circuitry, tunable filter circuitry including a node configured to pass a signal between an antenna and the communication circuitry, and control circuitry configured to cause energy in the tunable filter circuitry to ... | 07/14/2009 |
| 7555278 | Unconditionally stable filter An unconditionally stable on-chip filter includes a filtering section and at least one negative resistance module. The filtering section is operably coupled to filter a signal and includes realizable integrated circuit passive components. The at least one negative r... | 06/30/2009 |
