137results about "Discontnuous tuning with seperate pretuned circuits" patented technology

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 a source; a first integrated capacitive circuit controllably coupled across one of the primary and secondary windings and when so coupled operable to resonate with the integrated coupling transformer at a frequency in a first frequency band; and a second integrated capacitive circuit coupled across a second one of the primary and the secondary windings that is operable to resonate with the integrated coupling transformer at a frequency in a second frequency band. The method is in an IC and includes providing and coupling an input signal within alternatively a first frequency band and a second frequency band to a primary winding of an integrated coupling transformer; controlling an integrated switched capacitor network, coupled to the transformer, to provide a coupling network that is alternatively and respectively resonant at a first and second frequency within the first and second frequency band thus selectively providing an output signal at a secondary winding of the transformer; and down converting the output signal.

An analogue single conversion tuner comprises a plurality of channels (1, 2, 3) for covering the whole of a desired reception bandwidth. Each tuner comprises an image reject mixer (18) connected to the tuner input (4) by a single tracking filter (16), for example of the single-tuned type.

A variable frequency oscillator (VFO) circuit having an increased frequency tuning range to selectively obtain operating frequencies above and below a set frequency. The circuit includes a tank inductor connected in parallel with a tank capacitor for primarily defining the set oscillating frequency of the VFO circuit. A switchable capacitor is included for selectively providing a predetermined step-wise decrease of the oscillating frequency to a frequency value below the set frequency of the circuit, and a varactor is included for accommodating selective tuning of the oscillating frequency within a range of frequency values below the set frequency. The inventive circuit selectively includes a switchable inductance element which is selectively electromagnetically coupled to the tank inductor to decrease the overall inductance value of the VFO circuit and, thereby, selectively increase the oscillating frequency above the set frequency value.

Aspects of a method and system for configuring a transformer embedded in a multi-layer integrated circuit package are provided. In this regard, a windings ratio of a transformer embedded in a multi-layer IC package bonded to an IC may be configured, via logic, circuitry, and/or code in the IC, based on signal levels at one or more terminals of the transformer. The transformer may comprise a plurality of inductive loops fabricated in transmission line media. The integrated circuit may be flip-chip bonded to the multi-layer package. The IC may comprise a signal strength indicator enabled to measure signal levels input to or output by the transformer. The windings ratio may be configured via one or more switches in the IC and/or in the multi-layer package. The IC and/or the multi-layer package may comprise ferromagnetic material which may improve magnetic coupling of the transformer.

A voltage-controlled oscillator device with an LC-resonant circuit, in particular for implementing integrated voltage-controlled oscillators for the lower GHz range, is disclosed. The device achieves continuous frequency tunability in a wide range in particular with a low level of phase noise and phase jitter. In the voltage-controlled oscillator, a second inductor can be periodically switched in parallel and/or in series with at least one first inductor of the LC-resonant circuit by way of a switching means actuated with the oscillator frequency. A control input of the switching means is connected to a variable dc voltage. In that respect the relationship of the duration of the conducting state and the duration of the non-conducting state of the switching means is variable within an oscillation period of the oscillator in dependence on the value of the control voltage. In accordance with the relationship of the duration of the conducting state and the duration of the non-conducting state of the switching means within an oscillation period of the oscillator the time-averaged effective inductance is variable in dependence on the value of the control voltage.

In a channel selection device of the invention used in a digital/analog broadcasting receiver, in instructing changing a channel, either one of the UP/DOWN key pair or the RIGHT/LEFT key pair can be used to change a main channel while changing the other pair to change a sub-channel. Thus, by using the keys distributed between the main channel and the sub-channels, a correlation can be given between the key operations and the channels' hierarchical construction to thereby facilitate the changing and selection of the main channels and the sub-channels in the hierarchical construction in digital/analog broadcasts.

A display device capable of easily selecting or controlling an object of a web page displayed on a TV screen by using a remote controller while automatically converting a remote controller mode according to the sort or type of object, and a method thereof. The display device includes an input unit (100) for receiving a remote control signal generated when a user uses the remote controller, a remote controller mode management unit (200) receiving the remote control signal from the input unit (100) in order to check a key code value of the remote control signal, and in order to judge and convert a present remote controller mode, and a control unit (300) for controlling an operation of the remote controller based on the remote control signal inputted from the user and controlling a remote controller mode according to a sort or type of object selected by the user.

The invention provides a novel radio frequency receiving tuner system. The system comprising the following modules: a signal link module which is in charge of amplification, frequency conversion and filtering of a radio frequency input signal, and a frequency synthesizer module which is in charge of generating a local oscillation signal needed for frequency conversion. Moreover, a digital control unit is arranged in the system so as to realize communication with a digital baseband module or a microcontroller. The novel radio frequency receiving tuner system has the following positive effects: supporting a complete single chip integrated satellite digital television tuner, needing no assistive devices, such as an external LNA (Low Noise Amplifier), a Saw Filter and a crystal oscillation circuit; supporting multi-band receiving, such as 950MHz-1450MHz (ABS-S band), 950MHz-1750MHz (ABS-S expansion band) and 950MHz-2150MHz (DVB-S band); using simple 3.3V single supply in a power management system; being integrated with an I2C bus controller, and providing a software control interface; being integrated with automatic calibration circuits for frequency, gain, bandwidth and the like, and being free from manual testing and manual debugging.

Between a mixer and an intermediate frequency amplifying circuit, there are an intermediate frequency tuning circuit which, for reception of a TV signal, is tuned between a chrominance subcarrier frequency and a video intermediate frequency in an intermediate frequency band, and for reception of an FM broadcasting signal, is tuned nearly to the chrominance subcarrier frequency, and a first trap circuit which attenuates a sound intermediate frequency of an adjacent channel. Next to the intermediate frequency amplifying circuit, there is a second trap circuit which, for reception of a TV signal, brings about attenuation between the video intermediate frequency in the intermediate frequency band and the sound intermediate frequency of the adjacent channel and, for reception of an FM broadcasting signal, brings about attenuation around the video intermediate frequency.

A television tuner includes a mixer circuit for receiving a television signal or an FM signal, and a local oscillator circuit for generating an oscillation signal received by the mixer circuit. When the television signal is received, a television intermediate-frequency signal is generated by the mixer circuit. When the FM broadcast signal is received, an FM intermediate-frequency signal having a frequency converted to about 10.7 MHz is generated by the mixer circuit.

A television (TV) tuner includes a first mixer having an input terminal coupled to a received RF signal for producing an intermediate frequency signal, a notch filter having an input terminal coupled to the intermediate frequency signal for removing a first range of signals centered at a first center frequency in the intermediate frequency signal, a band-pass filter having an input terminal coupled to the intermediate frequency signal for passing a second range of signals centered at a second center frequency in the intermediate frequency signal, and a second mixer having inputs coupled to a filtered intermediate frequency signal for producing a first output signal. The filtered intermediate frequency signal is received from an output of the notch filter and the band-pass filter.

A communication device that incorporates the subject disclosure may include, for example, a conductive cover, an antenna structure, and a circuit. The antenna structure can comprise a first portion of the conductive cover having a first slot formed therein. The first portion can form a first antenna element for converting between first electromagnetic signals and first electrical signals. The first slot can define a shape of a trade dress design in the conductive cover. The circuit can be communicatively coupled to first edges of the first slot to define a first port. The circuit can perform operations comprising transmitting the first electronic signals into the first antenna element. Other embodiments are disclosed.

An information processing apparatus having a non-contact IC portion which performs radio communication with a reader/writer is provided. The non-contact IC portion includes: capacitors connected so that capacitance can be changed between multiple stages; a coil connected to the capacitors; and a switching portion which turns on/off connection of the capacitors so that a resonance frequency expressed based on capacitance of the capacitors and inductance of the coil is set within a given effective resonance frequency range.

The embodiment of the invention discloses a switch, a tuner of an antenna and a radio frequency device, and therefore transmission efficiency of the switch comprising a plurality of series transistors is adjusted comprehensively, and a leakage current is restrained. The switch comprises the 2N transistors which are sequentially connected in series. According to the 2N transistors which are sequentially connected in series, the control ends of any two transistors with the odd sequence numbers closest to each other are coupled through a first resistor, and the control ends of any two transistors with the even sequence numbers closest to each other are coupled through a second resistor; the control end of the nth transistor is coupled to a first control signal in switch control signals, and the control end of the (n+1)th transistor is coupled to the first control signal, wherein n is an integer which is greater than or equal to one and less than or equal to 2N-1, N is an integer greater than or equal to two, and the first control signal is used for controlling switching-on or switching-off of the switch.

According to an example embodiment, an apparatus is provided that produces a small-step switchable capacitor, which can have steps that are smaller in value than the smallest capacitor used in the system. In one embodiment, an input signal is connected to a switchable capacitor system that includes at least one and/or a plurality of small-step, switchable capacitors. In an example embodiment, a capacitor system may be provided that includes a first capacitance block coupled in series with a second capacitance block. In an example embodiment, the second capacitance block may include one or more switchable capacitors to provide a step in capacitance for the capacitor system between a first setting and a second setting using the one or more switchable capacitors. Also, in an example embodiment, the step in capacitance of the capacitor system may be determined based, at least in part, on a ratio of the capacitance of the second capacitance block to the capacitance of the first capacitance block.

Disclosed herein is a method for adjusting the tuning frequency of a tuning circuit, which is implemented as a parallel circuit of a coil and series circuits Ai each including a capacitor Ci and a switch device Qi (i=one to n, where n denotes an integer at least equal to two), by varying the tuning frequency through control to turn on and off the switch devices Qi in accordance with control data bi, the method for adjusting the tuning frequency of a tuning circuit including the steps of: finding control data bi for a desired tuning frequency from control data bi for a tuning frequency equal to a first frequency and control data bi for a tuning frequency equal to a second frequency; and applying the control data bi found for the desired tuning frequency to the switch devices Qi.

The invention relates to an agile ultrashort wave numerical control tracking tuning amplifying circuit with high anti-interference, and the amplifying circuit provided by the invention mainly comprises a front-end protective circuit, a sectional electric tuning concentrated selection narrow-band tracking filter, a gain control low-noise amplifier, a sectional electric tuning tracking filter, an electric tuning digital-analog converter, a gain control digital-analog converter, a data memory and a controller, wherein after the tracking frequency selection is carried out via the front-end protective circuit by the sectional electric tuning concentrated selection narrow-band tracking filter, an ultrashort wave radio signal received by an antenna is amplified by the gain control low-noise amplifier and is output after being subjected to frequency selection by the sectional electric tuning tracking filter; the data after tracking filtering and gain control is stored in the data memory and is converted into a voltage control value by the gain control digital-analog converter; and the waveband conversion, the tracking tuning and the amplitude equalization are carried out by the controller. According to the amplifying circuit provided by the invention, the capability of an ultrashort wave radio receiver for dealing with a complicated electromagnetic environment can be reinforced, and the amplifying circuit is suitable for a frequency hopping receiver and enables the frequency hopping receiver to have the characteristic of anti-interference.

The invention relates to an implementation method and circuit of multi-carrier/multiband frequency selection, which are used for implementing frequency selection of multi-carrier/multiband communication equipment. In the implementation method, each path of carrier/band uses the same local oscillator frequency Fo to carry out hybrid frequency in an upper link or a down link; and if the starting frequency of the ith path of carriers/bands of the multi-carrier/multiband communication equipment is shown as Fsi and the stop frequency of the ith path of carriers/bands of the multi-carrier/multiband communication equipment is shown as Fei, the centre frequency Fci of an intermediate-frequency filter which is used by the ith path of carriers/bands is equal to (Fei +Fsi)/2-Fo. The invention also provides a circuit of multi-carrier/multiband frequency selection. According to the method and circuit, one local oscillator circuit, one upper-conversion mixer and one down-conversion mixer can be shared by the multiple carriers/bands, thus decreasing equipment volume, reducing power consumption, reducing cost and shortening production time.

A microwave lens having an array of electronic inductive capacitive cells wherein each cell includes an electrically conductive pattern which responds to incident microwave electromagnetic energy as an LC resonator. At least one of the cells includes at least one MEMS device which is movable in response to an electrical bias to thereby vary the resonant frequency of that cell. In order to bias the MEMS device, an electrical insulating layer extends along a portion of the pattern of the cell and to both sides of the MEMS device. An electrically conductive strip then extends over the insulating layer so that the conductive strip is electrically insulated from the pattern while electrically connected to the MEMS device.