Capacitive isolation circuitry with improved common mode detector
First Claim
1. 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 providing 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 further comprising;
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 for receiving data within the differential signal from the second group of functional circuitry via the capacitive isolation circuitry; and
a detector circuit within the differential receiver for detecting the received data, the detector circuit monitoring the differential signal and generating a first logical output when a voltage generated responsive to the differential signal exceeds a programmable voltage threshold level and generating a second logical output when the voltage generated responsive to the differential signal falls below the programmable voltage threshold level.
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Accused Products
Abstract
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.
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Citations
20 Claims
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1. An integrated circuit having voltage isolation capabilities, comprising:
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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 providing 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 further comprising; 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 for receiving data within the differential signal from the second group of functional circuitry via the capacitive isolation circuitry; and a detector circuit within the differential receiver for detecting the received data, the detector circuit monitoring the differential signal and generating a first logical output when a voltage generated responsive to the differential signal exceeds a programmable voltage threshold level and generating a second logical output when the voltage generated responsive to the differential signal falls below the programmable voltage threshold level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An integrated circuit having voltage isolation capabilities, comprising:
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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 ; a second area galvanically isolated of the integrated circuit containing a second group of functional circuitry for processing the data stream, the second group of functional circuitry located in the substrate of the integrated circuit capacitive isolation circuitry located in conductive layers of the integrated circuit providing a high voltage isolation link between the first group of functional circuitry and the second group of functional circuitry through the capacitive isolation circuitry, the capacitive isolation circuitry further comprising; a differential transmitter associated with each of the first area and the second area for transmitting data in a differential signal to the second group of functional circuitry via the capacitive isolation circuitry; a differential receiver associated with each of the first area and the second area for receiving data within the differential signal from the second group of functional circuitry via the capacitive isolation circuitry; and a detector circuit associated with each of the first area and the second area within the differential receiver for detecting the received data, the detector circuit monitoring the differential signal and generating a first logical output when a voltage generated responsive to the differential signal exceeds a programmable voltage threshold level and generating a second logical output when the voltage generated responsive to the differential signal falls below the programmable voltage threshold level. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A detector circuit, comprising:
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a pair of inputs for receiving a differential signal; an output for providing data detected within the received differential signal; and circuitry for monitoring the differential signal and generating a first logical signal at the output when a voltage generated responsive to the differential signal received at the pair of inputs exceeds a programmable voltage threshold level and generating a second logical signal at the output when the voltage generated responsive to the differential signal received at the pair of inputs falls below the programmable voltage threshold level; a first current branch for generating a first current signal into a voltage node wherein the first current signal is generated in response to the differential signal; a second current branch for generating a second current signal into the voltage node wherein the second current signal is generated in response to the first current signal, further wherein the voltage threshold level is set at a gate of a transistor within the second current branch; and bias circuitry connected to the voltage node. - View Dependent Claims (18, 19, 20)
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Specification