Abstract: A method for accurately extracting capacitance and inductance parasitics from an electrical network representing a three-dimensional wiring of an integrated circuit chip or module is described. The extraction process can be performed either prior to or after completing a detailed wiring of the chip. In the former case, the method utilizes congestion information and approximate wiring length data to estimate the probability of encountering a particular pattern and the most accurate estimated capacitance which can arrived at. In the latter case, the wiring is partitioned into three-dimensional recognizable patterns, and a database of precomputed parasitics for each pattern is queried in order to obtain highly accurate parasitics within a limited number of machine cycles. The number of patterns is assumed to be sufficiently small to be memory and time efficient and to be arrived at in real-time.

Abstract: A cordless modem comprises a radio pair interfaced to a standard data/fax modem which allows a user of a personal computer to wirelessly connect to a telephone line. One end of the radio pair is a remote unit interfaced to the modem contained within the PC while the other end is a base unit connected to a standard telephone wall jack. The base unit can selectively discriminate and adjust for signals received from a telephone voice handset or data signals received from the cordless modem remote unit. Upon receiving an off-hook signal or an incoming call signal, the base unit identifies the type of data (i.e., voice or computer modem data) and adapts accordingly by placing an FM modulator in either of a narrow band deviation or a wide band deviation covering the required range of the particular signal combined with local echo. That is, when voice data is present, a low deviation, narrow filter combination is selected.

Abstract: A portable or notebook type computer communication interface that permits portable computers to be reliably used in a data processing network. The interface involves communication circuitry, special device inputs and power monitoring and charging. A flexible portable computer wireless time and frequency division network is formed using a time and frequency division multiplexed communication channel assignment feature that together with a wireless link establishes a unique direct communication channel between data processing devices on different levels with data packet type transmission security. The principle permits each portable computer in the network to communicate with any other and any and all can transmit and receive at the same time.

Abstract: A cordless modem comprises a radio pair interfaced to a standard data/fax modem which allows a user of a personal computer to wirelessly connect to a telephone line. One end of the radio pair is a remote unit interfaced to the modem contained within the PC while the other end is a base unit connected to a standard telephone wall jack. This arrangement allows the user the convenience and freedom of using a PC, laptop, personal digital assistant, etc., within several hundred feet of a phone jack without being encumbered by a cord. A warning alarm on the remote unit informs the user when the signal strength between the radio pair is below a threshold value. Additionally, the base unit may be equipped with two spatially separated antennas to help mitigate the effects of signal fading.

Abstract: The antenna is a hybrid microstrip and reflector antenna having a planar patch antenna mounted to an upper surface of an insulated planar substrate. The substrate is coupled to a ground plane by one or more insulated couplers so as to form an airgap therebetween. A coaxial cable connectable to a transceiver is coupled to the bottom surface of the ground plane at the outer conductor thereof and the inner conductor is coupled to a feed pin which passes through the ground plane and protrudes through the surface of the patch. The feed pin is secured to the patch by soldering.

Abstract: An antenna is integrated into the laptop to increase the efficiency, convenience and ruggedness of radio frequency transmission. The antenna extends from the laptop's cover when in use for maximum efficiency but retracts when not in use for ruggedness and convenience. The antenna is a multi-modal antenna to permit efficient transmission and reception in more than one range of frequencies. The multi-modal antenna is made up of multiple segments for transmitting and receiving at different frequencies that are matched to a single terminating circuit.

Abstract: A high-Q monolithic inductor structure formed using conventional silicon technology and having a first complete lower inductor spiral formed on a substrate and a second complete upper formed on a insulating layer over the first inductor spiral. Central portions of the inductor spirals are connected through a via hole in the insulating layer. The inductor spirals are oriented such that the current flows in the first and second spirals are in the same direction.

Abstract: There is disclosed a planar antenna for very low frequencies. The antenna has a high impedance and can be matched to 50 ohm or higher impedance stages. The antenna may be used for applications which require a short range such as a wireless peripheral. The antenna operates only in its near-field and does not require a complex lossy impedance matching network, since the input impedance is large.

Abstract: A multilayer antenna includes a first layer which is a ground plane and which has a plurality of first clearance holes. A first dielectric layer is positioned over the first layer and a second layer is positioned over the first dielectric layer and has a plurality of quarter wave transformers. A second dielectric layer is positioned over the second layer and a third layer ground plane is positioned over the second dielectric layer and has a plurality of second clearance holes for a feed structure. A third dielectric layer is positioned over the third layer and a fourth layer is positioned over the third dielectric layer and has a cross shape. The first and third layers are coupled together via plated-through holes.

Abstract: A method of designing a high Q inductor for implementation in multiple metalization levels in conventional integrated circuit technology uses a software assisted iterative technique to achieve a design Q factor. The inductor turns utilize the multiple metalization levels to reduce inductor resistance.

Abstract: A monolithic high-Q inductor structure is formed with multiple metalization levels in a conventional integrated circuit technology in which inductor turns utilize these multiple levels to reduce the inductor resistance. Inductors with Q values above five can be integrated with this approach at radio and microwave frequencies.