Joannes Mathilda Josephus Sevenhans

A novel active feedback flyback with only 100-mV inductive overshoot for a standard low-voltage CMOS inductive load driver, in a single-chip controller for 73 relays in a POTS/ADSL splitter application

This paper presents an inductive load driver. The circuit is realized in a standard low-voltage CMOS process: as the coil freewheels when the driver is switched off, the circuit clamps the output voltage at 100 mV above the power supply. Hence, no high-voltage technology or high-voltage tolerant circuit is required. 73 drivers are integrated in an ASIC, controlling 73 relays for a test access function on a POTS/ADSL splitter filter board. The driver also performs output voltage slope control and has an elegant, effective short-circuit protection.

A novel active feedback flyback [inductive load driver]

This paper presents an inductive load driver. The circuit is realised in a standard low-voltage CMOS process. As the coil free-wheels when the driver is switched off, the circuit clamps the output voltage at 100 mV above the power supply. Hence no high-voltage technology or high-voltage tolerant circuit is required. 73 drivers are integrated in an ASIC, controlling 73 relays for a test access function on a POTS/ADSL splitter filter board. The driver also performs output voltage slope control and has an elegant, effective short-circuit protection.

An integrated Si bipolar RF transceiver for a zero IF 900 MHz GSM digital mobile radio frontend of a hand portable phone

A single-chip solution for a GSM 900-MHz RF TX quadrature modulator and RX quadrature demodulator is designed and fabricated in a 9-GHz silicon bipolar technology. The transmit modulator is a direct upconverter and the receive demodulator operates in a zero IF architecture. This device is a component of a pocket-size hand-portable phoneset for application in the GSM pan-European digital mobile radio system. The consumption from the battery is 25 mA in RX mode and 45 mA in TX mode. The circuit is powered from a 5-V regulated supply voltage.<<ETX>>

An analog telephone subscriber chipset integrating 16 lines with fully programmable central office impedance

This paper describes the chipset (3 ASICs) for an analog telephone subscriber line circuit: a 16 channel digital circuit performing speech band filtering, echo cancellation, A-law//spl mu/-law coding and controlling interface, an 8 channel analog/digital circuit performing the A/D and D/A conversion with analog filtering, and an analog high voltage BICMOS circuit covering the SLIC (Subscriber Line Interface Circuit) function with special attention for the integration of software programmable synthesized AC and DC impedances.

A clock/data extraction device for use in ATM electro-optical networks

A device designed for clock extraction in an ATM optical network for a fiber in the loop system operating at 155/622 Mb/s is presented. The device applies a new clock phase alignment technique to recover the clock/data signal from up to 16 remote nodes.<<ETX>>