An apparatus comprising a functional circuitry on a first die. Said function circuitry configured to drive an RF voltage isolation link with an RF signal responsive to receipt of a logic signal at a first logic state. Control circuitry modifies the frequency of the RF signal to spread harmonics to other than a fundamental frequency.

Spread spectrum isolator

An integrated circuit having voltage isolation capabilities includes a first area of the integrated circuit containing functional circuitry that is located in the substrate of the integrated circuit. A second area of the integrated circuit contains an integrated RF isolation circuitry for voltage isolating the functional circuitry. The RF isolation circuitry is located in the metal layers of the integrated circuit.

On chip transformer isolator

A technique to provide a higher resolution DAC architecture for converting an N-bit digital word to a corresponding analog voltage signal without increasing chip area and switching capacitance. In one example embodiment, this is accomplished by using a triple string converter. In the triple string converter, a triple switching tree is coupled to a triple resistor string and to an analog output. Each switching tree includes a plurality of switches and each resistor string includes a plurality of corresponding resistors. A logic decoder coupled to the triple switching tree receives an N-bit digital word and generates a digital signal. The plurality of switches in each switching tree is substantially simultaneously controlled by the digital signal to output a range of corresponding analog voltage signals when the triple resistor string is connected across a voltage supply.

Triple resistor string DAC architecture

An integrated circuit having voltage isolation capabilities comprising a first galvanically isolated area of the integrated circuit containing a first group of functional circuitry for processing a data stream. The first group of functional circuitry located in a substrate of the integrated circuit. Capacitive isolation circuitry located in conductive layers of the integrated circuit provides a high voltage isolation link between the first group of functional circuitry and a second group of functional circuitry connected to the integrated circuit through the capacitive isolation circuitry. The capacitive isolation circuitry includes a differential transmitter for transmitting data in a differential signal to the second group of functional circuitry via the capacitive isolation circuitry. A differential receiver receives data within the differential signal from the second group of functional circuitry via the capacitive isolation circuitry. A detector circuit within the differential receiver detects the received data. The detector circuit monitors the differential signal and generates a first logical output when a voltage generated responsive to the differential signal exceeds a programmable voltage threshold level and generates a second logical output when the voltage generated responsive to the differential signal falls below the programmable voltage threshold level.

Capacitive isolation circuitry with improved common mode detector

A system for providing voltage isolation includes the first and second chips, each containing functional circuitry The chips are interconnected via at least one RF isolation link that provides voltage isolation between the first chip and the second chip and limits common mode signals therebetween

RF isolator with differential input/output

A digital-to-analog converter having series-connected transistors forming high impedance current sources for respective segmented resistor strings. A series transistor forming a current sink for one resistor string presents a high output impedance by utilizing a negative feedback amplifier. The effects of a headroom resistor and an offset resistor in one resistor string are negated by configuring an output amplifier with appropriate gain resistors. A highly accurate D/A conversion can be achieved by utilizing all resistors of the main and sub-resistor strings with the same value.

Douglas R. Holberg

Papers

Segemented D/A converter with enhanced dynamic range