Class 455/256 - Combined with other control

Subclass of Class 455 - Telecommunications
Definition: Subject matter including significantly claimed details of
No. of patents: 39
Last issue date: 03/27/2012

Number	Title	Issue Date
8145170	Low-cost receiver using tracking bandpass filter and lowpass filter A receiver (400) includes a tracking bandpass filter (420), a tunable lowpass filter (434), a local oscillator (442), and a mixer (444). The tracking bandpass filter (420) has an input for receiving a radio frequency (RF) in...	03/27/2012
7386289	Microwireless integrated environmental sensor and transmitter system The invention is a microminiature wireless environmental sensor that has integrated both sensor and transmitter functions into one function. The basic operating principle for the device is that variable components of an RF circuit can be interfaced to the outside wo...	06/10/2008
7356312	Fractional frequency synthesizer A frequency synthesizer circuit generates an output clock signal having a desired frequency relationship with an input reference signal, and offers essentially arbitrary relational values and adjustment resolution within any applicable circuit limits. The frequency ...	04/08/2008
7321755	Dual-mode clock for improved power management in a wireless device A dual mode clock for providing first and second clock signals to a wireless interface unit. The first and second clock signals correspond to first and second operating states of the wireless interface unit. In the first operating state, the transceiver in the RF an...	01/22/2008
7218179	Methods and apparatus for calibrating gm-Z In one embodiment of the present invention, an apparatus includes a plurality of gain stages each having a gain greater than one, and which are coupled to create a positive feedback at an oscillation frequency. The gain stages may be formed of transconductance gain ...	05/15/2007
7215936	Super-regenerative receiver including phase-locked loop An improved low-cost super-regenerative receiver includes sampling phase-locked loop. Phase sampling is controlled by the quench signal (264). In the preferred embodiment, logic state HIGH to logic state LOW transition of the quench signal (264) define...	05/08/2007
7184745	Wireless receiver operation A method and apparatus that monitors at least one environmental characteristic associated with a location of a wireless signal receiver (102). A determination is then made as to whether the wireless signal receiver (102) is likely to receive a wireless...	02/27/2007
7181178	Automatic gain control A method of controlling the gain of a receiver of a radio device suitable for use in a spread spectrum communication system comprising at least two base stations and a radio device, the method comprising estimating the extent to which received signal strength will d...	02/20/2007
7133647	Chiprate correction in digital transceivers A transceiver for a code division multiple access communication system comprises a receiver to receive coded information signals and a transmitter to transmit coded information signals. A local oscillator provides a time and frequency reference for the receiver and ...	11/07/2006
7098748	Integrated CMOS high precision piezo-electrically driven clock A clock oscillator embedded in an integrated circuit, including a piezoelectric resonator formed on the integrated circuit; a clock generator coupled to the on-chip piezoelectric resonator, one or more sensors adapted to sense one or more environmental parameters af...	08/29/2006
7020180	Method and apparatus for acquiring pilots over code space and frequency errors in a CDMA communication system Techniques to acquire pilots over code space and/or frequency errors. In one aspect, pilot acquisition is performed using a number of substages, and some of the substages are pipelined and performed in parallel using different processing elements. A searcher initial...	03/28/2006
6975941	Method and apparatus for intelligent acquisition of position information Improved methods and systems for position acquisition and/or monitoring are disclosed. The position acquisition and/or monitoring can be performed with improved intelligence so that data acquisition, transmission and/or processing is reduced. As a result, the positi...	12/13/2005
6975839	Apparatus, and associated method, for estimating frequency offset using filtered, down-sampled likelihood polynomials Apparatus, and an associated method, for facilitating frequency offset estimation between communication stations operable in a communication system. A likelihood polynomial is calculated and provided to a filter. The filter forms a filtered representation of the lik...	12/13/2005
6946917	Generating an oscillating signal according to a control current Generating an oscillating signal according to a control current includes receiving a control current corresponding to an oscillation frequency. A first differential signal and a second differential signal are generated by switching a first load according to the cont...	09/20/2005
6934524	Fine-stage automatic frequency compensation in post-detection short-range wireless applications A data-pattern feedback mechanism is introduced into the peak detection process of an automatic frequency compensation system in a Gaussian Frequency Shift Keying (GFSK) modulated system, providing fast and accurate fine-stage automatic frequency compensation (AFC)....	08/23/2005
6928275	Method and apparatus for compensating local oscillator frequency error The frequency error of an oscillator is minimized by characterizing the oscillator. A reference signal from an external source containing a minimal frequency error is provided to an electronic device. The external signal is used as a reference frequency to estimate ...	08/09/2005
6748199	Portable telephone apparatus and stablly supplying method of reference frequency A portable telephone apparatus includes a reference frequency generating section capable of suitably changing frequency accuracy of an output signal in accordance with an input control voltage, and a high-accurate reference frequency generating section having accura...	06/08/2004
6522871	Method and apparatus for compensating local oscillator frequency error through environmental control The frequency error of an oscillator is minimized by characterizing the operating environment of the oscillator. An electronic device monitors parameters that are determined to have an effect on the frequency accuracy of the internal frequency source. Tem...	02/18/2003
6324228	Method and apparatus for robust frequency tracking in strong channel interference using carrier signal relative strength and frequency error The present invention is a method and apparatus for tracking a frequency of a signal. The received signal is converted to an intermediate frequency (IF) signal using a frequency reference. An automatic gain control (AGC) is provided to the IF signal. The ...	11/27/2001
6278867	Methods and systems for frequency generation for wireless devices Methods and systems are provided for frequency generation suitable for use in wireless devices capable of operating at multiple frequencies. Such systems may change the loop gain of an automatic frequency control loop based on the operating frequency of t...	08/21/2001
6243597	Battery-operated communications device with the continuously running reference clock of which the frequency is reduced when a synchronization unit is controlled during a stand-by mode A battery-operated communications device has a radio frequency part, a baseband processing arrangement, a timing control arrangement, a continuously running reference clock that is coupled to the timing control arrangement, and a clock frequency reduction...	06/05/2001
6194975	Dual band VCO with improved phase noise A dual band VCO selects between the oscillator output frequencies by switching the resonant circuit elements in the active circuit. For each output frequency selected, the oscillator produces a single frequency signal and additional energy in the form of ...	02/27/2001
6112068	Phase-locked loop circuit with switchable outputs for multiple loop filters An electronic system, such as a wireless telephone handset (10), having multiple voltage-controlled oscillators (26, 28) so that the system can operate in a selected one of multiple frequency bands, is disclosed. Each of the voltage-controlled oscillators...	08/29/2000
5936480	Selective loading for sideband noise ratio reduction of a voltage controlled oscillator A voltage controlled oscillator (1) comprising a voltage controllable variable resonant circuit (2) having a control input (Vctrl), a positive feedback input (6) and a controllable variable frequency output (7). There is an amplifier (3) having an amplifi...	08/10/1999
5864749	Telecommunication terminal A telecommunications unit has an oscillating crystal as frequency standard, in which the temperature response of the oscillating crystal is counteracted by a compensation mode inserted into the unit's microprocessor prior to execution of the operating pro...	01/26/1999
5696797	Demodulator with baseband doppler shift compensation and method An apparatus and accompanying method for demodulating with baseband Doppler frequency shift compensation. An RF section (20) down-converts received data communication signals (12) to baseband. A/D converters (24, 26) digitize I, Q quadrature baseband sign...	12/09/1997
5448755	Oscillation scheme for a selective calling reception apparatus Disclosed is a selective calling reception apparatus which comprises an intermittent reception oscillator for intermittently receiving a selective calling signal from a base station and a signal processing oscillator for processing the selective calling s...	09/05/1995
5289506	Automatic frequency control circuit An AFC circuit stabilizes the frequency of an intermediate frequency signal to be applied to a demodulation circuit. A frequency conversion circuit responds to a local oscillation signal generated from a voltage-controlled oscillation circuit to convert t...	02/22/1994
5241700	Receiver of an electromagnetic signal with a known nominal frequency, liable to be affected by an unknown variation, in particular by the Doppler shift The invention concerns a feedback control loop comprising a mixer comprising a first input receiving an electromagnetic signal, and a second input receiving a first local signal; an intermediate frequency line mounted between the output of the mixer and t...	08/31/1993
5204975	Digitally-corrected temperature-compensated crystal oscillator having a correction-suspend control for communications service A radio transceiver having digitally-corrected temperature-compensated crystal oscillators (DTCXOs) including digital frequency temperature compensation circuits that are temporarily suspended from being updated, such that temperature compensation updates...	04/20/1993
5107522	Automatic frequency control circuit An AFC circuit stabilizes the frequency of an intermediate frequency signal to be applied to a demodulation circuit. A frequency conversion circuit responds to a local oscillation signal generated from a voltage-controlled oscillation circuit to convert t...	04/21/1992
5081652	Offset correction A radio receiver includes apparatus for correcting phase and frequency offsets in a digitally modulated carrier signal. The receiver includes processing circuitry which outputs a baseband signal at point. The circuitry includes a local oscillator generati...	01/14/1992
4947409	Apparatus for correcting frequency in a coherent receiver Apparatus for correcting the frequency in a coherent receiver associated with a radio communication installation, e.g. a mobile telephone installation for transmitting digital information in time-division multiplex. The receiver includes a controllable lo...	08/07/1990
4858159	Frequency-tuneable filter calibration An apparatus and method for calibrating a yttrium-iron-garnet-tuned filter (YTF) is disclosed. Instead of using both tune+span information from the 1st LO, only the sweep ramp used to span the 1st LO is used for the YTF's s own swept spans, and the YTF ha...	08/15/1989
4691377	Automatic frequency and gain control circuit An AFC/AGC circuit utilized in a receiving apparatus of a ground station for the satellite communication system comprising a digital AFC/AGC controller functioning such that; when the pilot signal is not received, the gain control voltage and the frequenc...	09/01/1987
4653117	Dual conversion FM receiver using phase locked direct conversion IF A receiver for frequency modulated signals, having down-conversion to a baseband, zero intermediate frequency for selectivity, followed by up-conversion to a non-zero IF for amplification, limiting, and demodulation. A phase-lock loop locks the frequency ...	03/24/1987
4509205	Radio receiver comprising a frequency locked loop with audio frequency feedback, and a muting circuit Radio-receiver having a frequency-locked loop which comprises, arranged one after the other, a tunable voltage-controlled oscillator, a mixer stage, a filtering element, as well as a frequency-voltage converter which is connected to the tunable voltage-co...	04/02/1985
4158174	Circuit arrangement for the production of a control signal in a receiving channel which is subject to interference A circuit arrangement for the production of a control signal, in particular a level regulation signal, in a receiving channel which is subject to interference, forms an amplitude-dependent control signal from the phase coded input signal. In the receiving...	06/12/1979
3935534	Converter-tuner for information transmission system An individually addressable converter-tuner station for use in a cable television distribution system for selectively enabling the reception by conversion of at least one secure channel signal on a conventional television receiver. The converter-tuner uti...	01/27/1976

PatentStorm

Did You Know...

PatentStorm News

Class 455/256 - Combined with other control