Isolation communications channel using direct demodulation and data-edge encoding
AssigneeSkyworks Solutions, Inc.
InventorsHuanhui Zhan, Krishna Pentakota
Life of this patent
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Abstract
An apparatus for communicating across an isolation barrier includes a differential pair of input terminals. The apparatus includes a bandpass filter circuit configured to receive a received signal on the differential pair of input terminals and to provide a received differential signal on a differential pair of nodes. The apparatus includes a demodulator directly coupled to the bandpass filter circuit and configured to directly demodulate the received differential signal on the differential pair of nodes to provide a demodulated received signal.
Claims18
An apparatus for communicating across an isolation barrier, the apparatus comprising:
- a differential pair of input terminals;
- a bandpass filter circuit configured to receive a received signal on the differential pair of input terminals and to provide a received differential signal on a differential pair of nodes;
- a demodulator directly coupled to the bandpass filter circuit and configured to directly demodulate the received differential signal on the differential pair of nodes to provide a demodulated received signal;
- and
- a transmitter path including an oscillator circuit configured to provide an oscillating signal to a differential pair of output terminals in response to a control signal, wherein the bandpass filter circuit includes a first inductor and a first capacitor matched to a second inductor and a second capacitor of the oscillator circuit.
An apparatus for communicating across an isolation barrier, the apparatus comprising:
- a differential pair of input terminals;
- a bandpass filter circuit configured to receive a received signal on the differential pair of input terminals and to provide a received differential signal on a differential pair of nodes;
- a demodulator directly coupled to the bandpass filter circuit and configured to directly demodulate the received differential signal on the differential pair of nodes to provide a demodulated received signal, the demodulator including a differential pair of transistors, each transistor of the differential pair of transistors having a corresponding source terminal coupled to a corresponding node of the differential pair of nodes;
- and a reference transistor having a first size greater than a sum of second sizes of transistors of the differential pair of transistors.
A method for communicating across an isolation barrier, the method comprising:
- bandpass filtering a received signal on a differential pair of input terminals to provide a received differential signal on a differential pair of nodes;
- directly demodulating the received differential signal on the differential pair of nodes to provide a demodulated received signal;
- selectively configuring a first instantiation of an LC circuit on a first integrated circuit die as an LC oscillator circuit;
- and
- selectively configuring a second instantiation of the LC circuit on a second integrated circuit die as a bandpass filter circuit.
Dependencies are inferred from the claim text.