Abstract: A system and method is used to tune filters, for example, analog filters in a sigma-delta modulator ADC. A known dither signal is used, for example a digital dither signal. Through adding of the dither to the modulator loop, the digital output of the sigma delta modulator ADC contains a filtered version of the digital dither. This signal can be used to reveal characteristics of the modulator-loop, including characteristics of a continuous-time filter in the modulator. Therefore, using the known digital dither signal and the output signal of the modulator, the continuous-time loop filter can be tuned. The tuning can be done in multiple ways, for example, by using standard LMS adaptive filter techniques to estimate the actual response of the continuous-time loopfilter and adjust the continuous-time loopfilter to the desired response.

Abstract: A pipeline ADC includes a pipeline structure having a plurality of analog-to-digital converting units cascaded in series; and a correcting unit coupled to the pipeline structure for correcting an output value of the pipeline structure according to a set of calibration constants. One of the analog-to-digital converting units contains a capacitor switching circuit. During error measurement of the pipeline ADC, the capacitor switching circuit switches to change capacitance allocation of the analog-to-digital converting unit so as to obtain the set of calibration constants.

Abstract: An integration type A/D converter has two sets of integration type A/D converter sections which can be periodically switched over at a predetermined period, with one converter section integrating an input signal to give an integral output voltage and another converter section performing A/D conversion of the integral output voltage. Further, use is made of a residual time interval in the period of A/D conversion, for the integration of the ground voltage and a reference voltage and for A/D conversions of the integrated voltages. The inventive A/D converter permits accurate measurement of continuous integral values of a given input signal.

Abstract: A system for reducing the number of programmable architecture elements in a look-up table required for implementing Boolean functions or operations that are identical or logically equivalent is provided. The system may include a single set of storage elements connected to the inputs of multiple decoders, and the storage elements may be concurrently accessed by the decoders to provide simultaneous multiple outputs thereto.

Abstract: A data sampling apparatus includes plural stages of first variable delay elements for sequentially delaying a data signal by a first delay amount, plural stages of second variable delay elements for sequentially delaying a strobe signal by a second delay amount which is larger than the first delay amount, and a plurality of timing comparators for sampling a plurality of data signals delayed by the plural stages of first variable delay elements by the strobe signal delayed by the second variable delay element of the same stage, wherein the timing comparator includes a dynamic D-FF circuit for latching and outputting the data signal by its parasitic capacitance based on the strobe signal, a buffer for delaying the strobe signal, and a positive feed-back D-FF circuit for latching and outputting the output signal outputted by the dynamic D-FF circuit by its positive feed-back circuit based on the strobe signal delayed.

Abstract: A method and apparatus for delivering media to a group of target communication devices provides for multicasting media to the group of target communication devices to save network resources. The disclosed embodiments provide for a significant reduction in network traffic and media processing time by transmitting media in multicast transport mode, where a single copy of the media destined for a group of target recipients is transmitted to a wireless infrastructure over the multicast path. The wireless infrastructure replicates and transmits one copy of the media to each of the target recipients that are assigned to dedicated channels, but multicasts one copy of the media to the target recipients that are assigned to a shared channel.

Abstract: A switched capacitor circuit includes an amplifier, a first switched capacitor network, and a second switched capacitor network. Either the first or second switched capacitor network is switched in a sampling configuration or a gain configuration according to connection states of the switches thereof. The amplifier includes a first transistor and a second transistor coupled to the first switched capacitor network, and a third transistor and a fourth transistor coupled to the second switched capacitor network. A first switch is coupled to a first connection point of the first and second transistors, and a second switch is coupled to a second connection point of the third and fourth transistors.

Abstract: A method and apparatus for packet-data header decompression, particularly advantageous for use in connection with broadcast and multicast messages being transported through a radio telecommunication system operable according to the CDMA 2000 standard. When a mobile subscriber desires broadcast content from a content server, the mobile station sets up a PPP session for submitting the request and negotiating security protocols. When a subscription is granted, the mobile station receives broadcast content that has undergone header compression. In order to synchronize its decompressor, the mobile station receives a full header from a PDSN. The full header is preferably sent out on a periodic basis just for this purpose.

Abstract: In an A/D conversion device, one level shift circuit shifts an input voltage to the low potential side by Vt1, and another level shift circuit shifts the input voltage to the high potential side by Vt2. A multiplexer selects either of the shifted voltages to an A/D converter. In a correction mode, a correction data holding circuit holds values of reference voltages that are also A/D converted after being passed through the one level shift circuit and values of reference voltages that are A/D converted by being passed through the other level shift circuit, as correction values. A correction control circuit corrects the A/D converted value using the correction values.

Abstract: A two part cellular radio telephone in which a separable part is charged from a cellular transceiver portion.

Abstract: An operational amplifier with selectable performance characteristics is provided. The operational amplifier provides a sleep mode (e.g., fully disabled) in addition to providing a number of different levels of awake operation (e.g., different performance characteristics). As such, the op-amp can allow a system to use only the power needed to obtain a required level of performance at any point in time. For example, the op-amp may be operated at a minimum power mode, an awake at mid-level power mode, or an awake at maximum power mode.

Abstract: The present invention relates to a method in a communication system. The system comprises a controller arranged to control transmission power of stations, a first station and a second station, the controller being arranged to provide the first station with a target for use in control of the transmission power of the second station, monitoring means, and means for preventing use of a target for the transmission parameter that exceeds a limit value. The controller provides the first station with the target and the first station adjusts the transmission power of the second station on basis of the target. A predefined condition is monitored, and upon occurrence of the predefined condition, use of a target for the transmission parameter exceeding a limit value for the target for the transmission parameter is prevented.

Abstract: Method for transmitting an information representative of the number of spreading codes allocated to the mobile stations in communication with a base station of a mobile telecommunication system, wherein it includes the step of: forming a word, said transmitted word, the content of which is representative of the number of spreading codes allocated, including in each transmission burst a general midamble resulting from the sum of selected midambles among all the available midambles, said selection being done by said base station in relation with said transmitted word so that a selected midamble corresponds to a binary element of said transmitted word equal to a first value and a non-selected midamble corresponds to a binary element of said transmitted word equal to second value, considering a received word the elements of which are in one-to-one relationship with the temporal positions of the estimations respectively corresponding to said available midambles.

Abstract: Remote units within a first communication system (121) utilizes frequencies (channels) from a second communication system (120) when placing a call. When a first remote unit (106) wants to call a second remote unit (107) using the channels, the first remote unit sends a base station (103) a list of top N traffic channel blocks from the second communication system along with the identity of the second remote unit. The base station then pages the second remote unit using a signaling channel reserved by second system. The second remote unit responds to the page with its list of best traffic channel blocks/chunks. The base station then picks the best overlap of idle channels from the list received by the remote units, and sends the list to the remote units instructing them use those traffic channels. Once the remote units receive the available channels, they can begin their call.

Abstract: A Gray code decoder for decoding input numbers includes a first select circuit that selects an M-bit Gray code number from a M-bit Gray code having a one-bit separation I and a two-bit separation J. A second select circuit selects an N-bit Gray code number from a N-bit Gray code, wherein K=M+N, M?N, and at least one of I and J is greater than, or equal to, 2N. A concatenate circuit concatenates the selected M-bit Gray code number and the selected N-bit Gray code number to produce a K-bit Gray code number.

Abstract: An analogue amplifier with multiplexing capability, without the need to incorporate a multiplexor, comprising an input port, a test input port, an output port, a control input to switch the amplifier between a normal amplifying mode and a test mode, wherein a analogue signal introduced to the input port is amplified to the output port in normal mode, and a test signal on the test port is routed to the output port when the amplifier is in test mode.

Abstract: Two computer systems in a network each have a local store that contains a copy of a data item that is to be synchronized. One of the computer systems may be, for example, a mobile device while the other may be a synchronization server. In order to determine whether to synchronize a data item, and what synchronization mechanism to use, one of the computer systems references a flexible set of rules that may be influenced by instructions from a network administrator or a mobile device user. The flexible set of rules takes into consideration the value of the data, the cost associated with synchronization, the security of the synchronization mechanisms, the security of the mobile device, as well as the location of the mobile user in dictating whether and how to synchronize.

Abstract: Location-based grouping according to the present invention enables grouping of wireless network subscribers (S1–S4) based on their location within a coverage area (24, 26) and offering services based on their respective group affiliations. Specifically, the location-based grouping defines a plurality of zones (Z1–Z3), identified by coordinates, within a network coverage area (24, 26) and assigns a dynamic network subscriber group number to each zone. The location-based grouping of the present invention requires that a service provider (14) maintain both a static network subscriber group database containing network-wide subscriber subscription parameters and a dynamic network subscriber group database containing zone-specific network subscriber subscription parameters, and that a network subscriber (S1–S4) register when the network subscriber enters into one of the plurality of zones (Z1–Z3) within the network coverage area (24, 26).

Abstract: The invention protects the security of a communication between a mobile radio and a radio access network (RAN). A connection is established through the RAN to support a communication with the mobile radio. The connection is configured with a first security configuration. One or more messages are sent over the connection using the first security configuration, each message having a message sequence number. When the connection needs to be configured to a second security configuration, an activation message sequence number associated with the reconfiguration is set. When the reconfiguration process is complete and the second security configuration is to be activated, the next message is sent over the connection with the activation message sequence number. Until that time and during the reconfiguration, when the mobile radio transmits a message with a message sequence number lower than the activation message sequence number to the RAN, it uses the first security configuration.

Abstract: A method and an apparatus for analyzing performance of a multi-stage radio frequency amplifier are described. The method simplifies the multi-stage radio frequency amplifier into equivalent input parts, output parts and mid-stage parts. The mid-stage parts are temporarily unset. Therefore, the equivalent input parts and output parts will be adjusted to make best gain performance and the mid-stage parts will be the next targets for analysis. Repeating the above-mentioned methods for decomposing the circuit can systemize the method for analyzing circuits and problems in each part of the circuit may be found more quickly.