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| Number | Title | Issue Date |
| 8121574 | Loop-type directional coupler A loop directional coupler having a first waveguide, particularly a hollow, planar, or a coaxial conductor in the form of a half loop antenna having first and second antenna branches for the contact-free extraction of an incoming signal “a” on a second waveguide... | 02/21/2012 |
| 8064864 | RFID using an hybrid on-chip-off-chip transformer A radio frequency identification (RFID) system includes an RFID reader and an RFID tag. The RFID reader is coupled to transmit first electromagnetic signal via an off-chip winding section of a hybrid on-chip-off-chip transformer. The RFID tag is coupled to receive t... | 11/22/2011 |
| 7979043 | Programmable antenna interface with adjustable transformer and methods for use therewith A programmable antenna interface for coupling an antenna to a transceiver having a receiver section and a transmitter section, includes a transformer that is adjustable in accordance with a control signal. A transmit/receive module couples the transformer to the rec... | 07/12/2011 |
| 7751790 | Hybrid on-chip-off-chip transformer A hybrid on-chip-off-chip transformer includes an off-chip winding section and an on-chip winding section. The off-chip winding section is coupled to produce a first electromagnetic signal from a reference source. The on-chip winding section is coupled to derive a s... | 07/06/2010 |
| 7546106 | Electronic circuit An electronic circuit capable of carrying out communications by inductive coupling with minimum power consumption between substrates. Although the amplification factor of the amplifier 10a is 1, the amplification factors of the amplifiers 10b... | 06/09/2009 |
| 7366487 | Receiving band switching circuit with reduced signal loss upon switching receiving band A receiving band switching circuit includes a first high frequency circuit through which a first frequency band signal passes, a second high frequency circuit through which a second frequency band signal passes, and a third high frequency circuit that is provided in... | 04/29/2008 |
| 7365602 | Multilevel power amplifier architecture using multi-tap transformer A multi-level power amplifier architecture using a multi-tap transformer implemented on a single CMOS integrated circuit wireless communications device is described. By providing a multi-tap transformer for coupling a plurality of power amplifiers to a shared output... | 04/29/2008 |
| 7336939 | 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... | 02/26/2008 |
| 7324796 | Low temperature co-fired ceramic sub-harmonic mixer A sub harmonic mixer has improved electrical performance in a small package size. The mixer has a low temperature co-fired ceramic substrate. Coupled lines are located within the substrate and connected to an LO port, an RF port and an intermediate frequency port. T... | 01/29/2008 |
| 7315192 | CMOS-based receiver for communications applications A receiver and receiver front end having multiple independent differential inputs, multiple independent differential low-noise amplifiers, and two sets of double-balanced IQ mixers. The double-balanced mixers include cross-coupled PMOS devices that dynamically injec... | 01/01/2008 |
| 7302247 | Spread spectrum isolator A circuit package includes first and second units containing functional circuitry. At least one RF isolation link interconnects the first and second units and provides voltage isolation between the first and second units. The RF isolation link provides data between ... | 11/27/2007 |
| 7263343 | Frequency converter and radio communication device using same A frequency converter that performs dual frequency conversion is provided. The frequency converter restricts noise occurrence and enables signal transfer with good linearity. The frequency converter performs dual conversion of a first signal (RF(+) and RF(−)) by u... | 08/28/2007 |
| 7248844 | Radio frequency integrated circuit electo-static discharge circuit The radio frequency integrated circuit (RFIC) electrostatic discharge (ESD) circuit includes an integrated circuit pin and a radio frequency (RF) ESD circuit. The integrated circuit pin provides coupling to an antenna. The RF ESD circuit is operably coupled to the i... | 07/24/2007 |
| 7239243 | RFID tag imager In one embodiment, a system for obtaining an image of an RFID tag comprising a transponder and a tag antenna is provided, the system comprising: a plurality of inductors, each inductor being associated with a capacitor to form a resonant tank circuit, wherein each r... | 07/03/2007 |
| 7224231 | Method for transforming output signals of a low-noise amplifier of a wireless transceiver A method for transforming single-ended signals outputted from a low-noise amplifier of a wireless transceiver into differential signals. The method includes: providing a transformer according to a default requirement of the wireless transceiver; transferring the sin... | 05/29/2007 |
| 7200375 | Radio receiver system A radio receiver system having a plurality of receiving antennas and a plurality of receivers is described in which antenna signals of a multiplicity of the plurality of receiving antennas are fed to each of the plurality of receivers. The plurality of receiving ant... | 04/03/2007 |
| 7190153 | System, circuit and method for tuning a resonant circuit A circuit may be tuned to resonate at a driving frequency. The circuit includes a source that provides an output at a drive frequency and a resonant circuit having an input coupled to the source, an output, and first and second selectable resonant frequencies. The f... | 03/13/2007 |
| 7184735 | Radio frequency integrated circuit having symmetrical differential layout A radio frequency circuit includes a first differential RF path and a second differential path. The first differential RF path includes at least one RF block that includes a first differential section and a second differential section, wherein the first differential... | 02/27/2007 |
| 7158771 | Integrated circuit transponder having a plurality of high-gain radio frequency signal inputs A high gain input stage for a radio frequency transponder uses an amplifier for increasing a magnitude of an input signal. A DC bias circuit is used for controlling the operation of the amplifier. A resonant circuit is coupled between the amplifier and the DC bias c... | 01/02/2007 |
| 7132946 | Variable frequency radio frequency identification (RFID) tags Various radio frequency identification (RFID) tags are described that dynamically vary their resonant frequency to reduce or eliminate the potential effects of electromagnetic “tag-to-tag” coupling. An RFID tag, for example, includes a main antenna tuned to a fi... | 11/07/2006 |
| 7088982 | Gilbert cell and method thereof A stacked Gilbert cell mixer performs two frequency conversions in at least one of a wireless transmitter and receiver and includes a first stage of the stacked Gilbert cell mixer that converts a voltage signal input to the stacked Gilbert cell mixer to a current si... | 08/08/2006 |
| 7084713 | Programmable capacitor bank for a voltage controlled oscillator A programmable capacitor bank includes multiple tuning elements. Each tuning element includes two tuning capacitors and a pass transistor that electrically connects or disconnects the capacitors to/from common nodes. For a thermometer decoded capacitor bank, the tun... | 08/01/2006 |
| 7076206 | System for wireless transmission of electrical power, a garment, a system of garments and method for the transmission of signals and/or electrical energy The invention describes a system for electrical transmission in the field of garments and a corresponding transmitter for this. Electrical circuits in garments are coupled, preferably inductively in a wireless manner with electrical devices and/or electrical circuit... | 07/11/2006 |
| 7039381 | On-chip differential inductor and applications thereof An on-chip differential inductor includes a 1st interwound winding having a substantially octagonal shape, or rectangular octagonal shape, and a 2nd interwound winding having a substantially octagonal shape, or rectangular octagonal shape, that... | 05/02/2006 |
| 7030940 | Tuner that suppresses outside radiation of inside oscillated signal An integrated circuit is mounted on a printed board in a state in which a first edge thereof is located to face to a first side of the printed board and a second edge adjacent to the first edge is located to face to a second side adjacent to the first side of the pr... | 04/18/2006 |
| 7010279 | Radio frequency integrated circuit electro-static discharge circuit The radio frequency integrated circuit (RFIC) electrostatic discharge (ESD) circuit includes a transformer balun, an impedance matching circuit and a clamping circuit. The balun is operably coupled to transpose a single-ended radio frequency (RF) signal and differen... | 03/07/2006 |
| 6993313 | Integrated structure of inductances with shared values on a semiconductor substrate An integrated circuit including a structure of inductances on a semiconductor substrate, intended for operating at frequencies greater than several hundreds of MHz, including a first inductance formed by a conductive track and having first and second terminals respe... | 01/31/2006 |
| 6957057 | Switched capacitor mixer circuit to attain high gain and linearity in radio frequency receivers By implementing the sampling process at an AC ground node, rather than at a signal side, and adding a gated transistor (610 and 620) in the signal path, the present invention reduces the interdependency between gain and linearity in a switched capacito... | 10/18/2005 |
| 6952573 | Wireless receiver with stacked, single chip architecture A monolithic wireless receiver suitable for use in a global positioning system (GPS) or other radio frequency (RF) application suitably includes a mixed-mode integrated circuit and a stacked memory device. The mixed mode integrated circuit appropriately includes a d... | 10/04/2005 |
| 6947717 | High isolation mixer A mixer with improved isolation between the RF and local oscillator frequency signals. The mixer has a substrate. A pair of cores are mounted to the substrate. Windings are wound on the cores to from a pair of baluns. A diode ring is connected between the baluns. Th... | 09/20/2005 |
| 6919858 | RF antenna coupling structure An RF antenna coupling structure includes a first transformer, a second transformer, and a transformer balun. The first transformer includes a primary winding and a secondary winding, wherein the primary winding of the first transformer is operably coupled to a powe... | 07/19/2005 |
| 6889036 | Integrated frequency selectable resonant coupling network and method thereof An integrated center frequency selectable resonant coupling network suited for use in an integrated circuit is disclosed. The network includes an integrated coupling transformer having a secondary winding for coupling to a load and a primary winding for coupling to ... | 05/03/2005 |
| 6871059 | Passive balun FET mixer A FET mixer uses a balun having a primary and secondary, with the primary coupled to an radio frequency signal input. The mixer also includes a pair of field effect transistors (FETs), wherein the gates are coupled to one another and to a local oscillator input. One... | 03/22/2005 |
| 6600910 | Radio frequency transformer and its use A radio frequency transformer has the two lines which constitute it on at least four levels of a printed circuit. Two of the four levels correspond to each line. In one variant the lines are wrapped onto a cube. The levels corresponding to one line are in... | 07/29/2003 |
| 6516182 | High gain input stage for a radio frequency identification (RFID) transponder and method therefor A high gain input stage for a Radio Frequency Identification (RFID) transponder uses an amplifier for increasing a magnitude of an input signal. A DC bias circuit is used for controlling the operation of the amplifier. A resonant circuit is coupled betwee... | 02/04/2003 |
| 6393265 | Method and apparatus for two dimensional filtering in a communications system using a transformer system A transformer system comprises a transformer star winding to be coupled to an antenna system, and a transformer delta winding disposed with said transformer star winding. The transformer star winding includes a set of star elements and the transformer del... | 05/21/2002 |
| 6275687 | Apparatus and method for implementing a low-noise amplifier and mixer Disclosed is an apparatus for modifying a radio frequency signal. In one embodiment, the apparatus includes a mixer, an amplifier module and an interface circuit. The mixer is configured to receive a first signal having a first frequency and a second sign... | 08/14/2001 |
| 6219529 | Wireless communication system using only the magnetic field component In order to eliminate the unnecessary power consumption caused by the increase in frequency associated with wireless communication systems using electromagnetic induction techniques, the wireless communication system of the present invention modulates and... | 04/17/2001 |
| 6157822 | Tuned low power/low noise mixer A tuned low noise mixer (200) for use in radio frequency (RF) communications includes a transconductance amplifier (203) for amplifying an RF input signal (201). An impedance matching network (207) is formed using an impedance matching transformer with a ... | 12/05/2000 |
| 5986617 | Multiband antenna matching unit An unbalanced to balanced antenna matching unit (AMU) is capable of operating over a relatively large frequency range by utilizing multiple transformers connected in series, with a set of bypass switches used to control the number of transformers that are... | 11/16/1999 |
