Class 379/401 - Voltage boosting circuit

Subclass of Class 379 - Telephonic communications
Definition: Subject matter which increases the magnitude of a voltage
No. of patents: 40
Last issue date: 08/05/2008

Number	Title	Issue Date
7408993	Digital communication extender system and method An extender circuit for handling a communication signal transmitted over a transmission line includes a voltage clamp and a current booster circuit. The voltage clamp is connected to a receive end of the transmission line and is operable to clamp a reflection signal...	08/05/2008
7386117	Efficient handling of ISDN connections by a packet-oriented exchange The invention relates to the representation, independent of access type, of ISDN accesses (PRA, BRA) in the central core (cVst) of a packet-oriented exchange (P-Vst). By adapting the signaling information transmitted by ISDN accesses in a peripheral unit (PE) it is ...	06/10/2008
7269254	Integrated driver circuitry A linear amplifier architecture includes first, second, and third stages. The first stage is a transconductance stage. The third stage is a current amplification stage. The second stage is an interfacing stage between the first and third stages. The interfacing stag...	09/11/2007
7212502	Method and apparatus for dynamically adapting telephony analog loss based on channel content A method is provided for introducing analog loss to an information-bearing signal being transmitted to or from end-user terminal equipment over a communication system such as a cable network The method begins by establishing a communication path to the terminal equi...	05/01/2007
7155008	Power offloading for a subscriber line interface circuit A power offload network has a first node for receiving a first supply V1 and a second node for receiving a second supply V2. The power offload network includes a plurality of switches and a power offload element providing a supply drop of VR. The switc...	12/26/2006
7149246	Method and apparatus for reducing oscillator pull in a CMOS wireless transceiver integrated circuit A monolithic transceiver integrated circuit that includes a substrate, a transmitter subsystem of one or more subcircuits on the substrate, and a receiver subsystem of one or more subcircuits on the substrate. Also included is a bias current supply coupled to the re...	12/12/2006
6940970	Ring boost circuit to extend ringing range of telephone SLICs A ring boost circuit has a first switching device coupled to a ring node. The first switching device is responsive to a ring operation. A charge pump is connected to the ring node, and the charge pump provides a voltage offset to enhance a differential voltage betwe...	09/06/2005
6920218	Combination clock and charge pump for line powered DAA Disclosed is a method and apparatus which facilitates the use of existing power that is ordinarily unused or discarded to provide power to a telephone interface circuit when the circuit is in the on-hook state, thereby alleviating the need to use loop current to pow...	07/19/2005
6912282	Enabling Cisco legacy power to support IEEE 802.3 AF standard power An apparatus and method for enabling Cisco legacy power to support IEEE 802.3 AF standard power. A network power system capable of delivering data terminal equipment power via a media dependent interface includes power source equipment according to Cisco legacy powe...	06/28/2005
6873702	Telephone subscriber system A subscriber's telephone system is presented that includes at least one driver circuit connected to Tip and Ring terminals. An additional network is connected between an output of the driver circuit and the Ring terminal. This additional network includes a suitably ...	03/29/2005
6823066	Digital access arrangement circuitry and method having current ramping control of the hookswitch A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end to provide a communication path for signals to and from the phone lines. Briefly described, a means for providing a proper hookswitch transition ...	11/23/2004
6782096	Subscriber line driver and termination A subscriber line driver (SLD) is provided for the continuous and automatic transformation of the characteristics of a communication system signal so that the signal conforms to a power spectral distribution (PSD) standard. The signal is transformed by the SLD which...	08/24/2004
6665339	Method and apparatus for reducing oscillator pull in a CMOS wireless transceiver integrated circuit A monolithic transceiver integrated circuit that includes a substrate, a transmitter subsystem of one or more subcircuits on the substrate, and a receiver subsystem of one or more, subcircuits on the substrate. Also included is a bias current supply coupl...	12/16/2003
6654462	Line terminal circuit for controlling the common mode voltage level on a transmission line A line terminal circuit comprises a buffer section (A, D) for connection to a transmission line (TL) and for performing at least one of the functions receiving signals from said transmission line and transmitting signals via said transmission line; a cont...	11/25/2003
6519339	Method of regulating power transfer across an isolation barrier An efficient method and circuitry for transferring various levels of power across a high voltage isolation barrier. In one embodiment of the invention, a data access arrangement (DAA) is provided with system side circuitry that provides power to line side...	02/11/2003
6144647	Communication system, mobile services switching center and method for establishing a multi-dialogue communication between subscriber stations A communication system, a mobile services switching center and a method is described, for allowing a multi-dialogue communication to take place between a first subscriber station (MS1, MS2, . . . MSn) and a second subscriber station (ISDN ST1) through a m...	11/07/2000
5960075	Switchmode power converters for telephone subscriber line interface circuits A power converter forming part of a telephone subscriber line interface circuit selectively generates a ringing signal waveform, for supply to the line, or a supply voltage for a driver circuit for providing loop current on the line. First and second fixe...	09/28/1999
5889854	Technique for compensating for signal attenuation on a telephone line An apparatus compensates for an attenuation of a signal on a telephone line in a communication system connected to the telephone line via a transformer. A photo coupler detects a loop current at a primary winding of the transformer. A controller generates...	03/30/1999
5862213	Circuit arrangement for generating charge pulses A circuit arrangement for generating charge pulses during digital telecommunications is indicated, whereby subscribers (Tln) of a telephone network are connected by cables with an exchange. The subscriber telephones are connected by electric service lines...	01/19/1999
5721766	Communication apparatus able to call plural designated destinations A communication apparatus capable of designating plural destinations in a simple manner. The communication is automatically initiated after the lapse of a predetermined time from the designation of at least one destination, so that the operator is not req...	02/24/1998
5553132	Method and an arrangement for generating a ringing signal To generate a ringing signal by means of a subscriber line interface circuit having two final stages, each for supplying an individual subscriber line wire, one of the subscriber line wires is connected to one of the input terminals of an operational ampl...	09/03/1996
5396553	Automatic loss control circuit Disclosed is a circuit for providing an appropriate amount of on-hook loss in a digital loop carder transmission system serving telephone customers. The resistance of the customer loop is measured while the customer is off-hook and an amount of loss is ad...	03/07/1995
5359655	Supply circuit for a telecommunication line, providing highly symmetrical and rapid response to line voltage disturbances A supply circuit for a two-wire telecommunication line includes a voltage adjusting circuit section coupled between one of the wires and a first reference potential point and further includes a current source coupled between the second wire and a second r...	10/25/1994
5349640	Option bus adapter A method and apparatus for connecting a programmable computing device to a digital telephone via an adapter. The digital telephone includes an option bay connection, having a hierarchical control protocol. The option bay connection makes available several...	09/20/1994
5315653	Current limited subscriber interface circuit An electronic interface circuit between a telephone subscriber line and a telephone main exchange is disclosed which forms, with the main exchange battery, a supply bridge for the telephone line, with limitation of the line current to a predetermined thre...	05/24/1994
5280525	Adaptive frequency dependent compensation for telecommunications channels The quality of speech being transmitted in a telecommunication channel is enhanced by adaptively compensating for frequency dependent attenuation in the telecommunication channel. The frequency dependent attenuation in the telecommunication channel is dyn...	01/18/1994
5274702	Wideband telephone line interface circuit An active impedance line interface circuit for connection to a two-wire telephone line comprises tip and ring unity gain d.c. amplifiers having outputs d.c. coupled via feed resistors to tip and ring wires respectively. Loop current and common mode curren...	12/28/1993
5274703	Automatic loss control circuit A circuit is proposed for adjusting the loss provided to loops in digital loop carrier transmission systems. A constant current is supplied to the loop and the resulting voltage is measured to determine the resistance of the loop. This value is fed to a m...	12/28/1993
5051980	Data communication interface device A Data Communication Device permits extended range RS-232 communications between two devices by utilizing a current loop between the remote device and the Data Communication Device. The Data Communication Device may be used for any mix of signal or contro...	09/24/1991
4931988	Communication apparatus with a remotely adjustable signal level function A communication control system of a communication apparatus, such as a facsimile machine, which uses an analog communication network, such as the public telephone network, includes setting means for setting a signal transmitting level in accordance with i...	06/05/1990
4431869	Telephone line feed In a telephone line feeding arrangement, the line current is monitored by a multi-resistor network (Rp Rs) and the output of the network applied to the inputs of an operational amplifier (A3). The output of this amplifier, which is a...	02/14/1984
4205204	Telephone loop extending apparatus A subscriber loop extender for a telephone system in which a variable shunt conductance (41) is placed across the loop in response to a loop current indicating an off hook condition (32). An optical coupler (39) using a photo-resistor (41) or a photo-tran...	05/27/1980
4140881	Telephone loop extending apparatus An electrical apparatus for use with telephone equipment to extend the effective length of an electrical circuit such as a subscriber loop or the like. The disclosed apparatus includes a variable resistance in shunt across the loop between the central off...	02/20/1979
4130735	Loop extender A loop extender for adding a series-aiding boost voltage to a subscriber loop of a telephone system and having a d.c. boost voltage supply, an amplifier circiit having an active device connecting the voltage supply in series with a conductor of said loop ...	12/19/1978
4127747	Voltage boost circuit for telephone systems In a voltage boost circuit, for telephone systems where reverse battery supervision is employed, optically coupled semiconductor devices are used to control both the polarity and the charge on a nonpolar capacitor. This capacitor is powered from a DC to D...	11/28/1978
4122312	Loop extender A loop extender is used in conjunction with a pair of telephone lines extending from a telephone central office to a subscriber location in order to insert a booster DC potential on the telephone lines in such a manner as to aid the flow of DC current pro...	10/24/1978
4061883	Repeater for transmission lines of differing lengths A circuit for varying the amplification afforded to a-c signals transmitted through a transmission line in accordance with the a-c losses of that transmission line. Gain control circuitry is provided which varies the magnitude of amplifying voltages and c...	12/06/1977
4024351	Telephone line battery boost circuit Transmission and signaling range of a telephone transmission line is extended by controllably inserting boost potentials into the line to series aid an applied central office battery. Insertion of the potentials is realized by sensing the direction of cur...	05/17/1977
3992591	Telephone line battery boost circuit Transmission and signaling range of a telephone transmission line is extended by controllably inserting boost potentials into the line to series aid an applied central office battery. Insertion of the potentials is realized by sensing the direction of cur...	11/16/1976
3955052	Subscriber unit particularly useful for time-division-multiplex system A line circuit for connecting telephone subscriber terminals to a signal transmission network which includes constant current sources for driving the subscriber terminals and an isolated line transformer for connecting the terminals to the transmission ne...	05/04/1976

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Class 379/401 - Voltage boosting circuit