Systems and methods for powering circuits for a communications interface
First Claim
1. An electronic circuit comprising:
- transmission line driver circuitry coupled with a transmission line, the transmission line coupled with a first power supply through an impedance;
digital data circuitry coupled with the transmission line driver circuitry and configured to transmit data over the transmission line using the transmission line driver circuitry, the digital data circuitry configured to receive power from a second power supply;
current regulator circuitry coupled with the transmission line driver circuitry and configured to regulate a current received from the first power supply through the transmission line driver circuitry to be approximately constant; and
voltage regulator circuitry coupled with the current regulator circuitry and configured to provide the second power supply having an approximately constant voltage, the second power supply supplying current received from the first power supply through the current regulator circuitry to at least the digital data circuitry.
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Accused Products
Abstract
Embodiments include systems and methods of powering data communications transmitter circuitry using current sinked from biasing circuitry used to bias a transmission line between the data communications transmitter circuitry and data communications receiver circuitry. In some embodiments, the current sinked from the biasing circuitry is sourced by a power supply configured to power the data communications receiver circuitry. The current sinked from the biasing circuitry is then re-used to power the data communications transmitter circuitry. The data communications transmitter circuitry can be operated using less power overall than the prior art by re-using the current first used to bias the transmission line to power the data communications transmitter circuitry. Various embodiments include HDMI transceivers, DVI transceivers, and DisplayPort transceivers.
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Citations
19 Claims
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1. An electronic circuit comprising:
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transmission line driver circuitry coupled with a transmission line, the transmission line coupled with a first power supply through an impedance; digital data circuitry coupled with the transmission line driver circuitry and configured to transmit data over the transmission line using the transmission line driver circuitry, the digital data circuitry configured to receive power from a second power supply; current regulator circuitry coupled with the transmission line driver circuitry and configured to regulate a current received from the first power supply through the transmission line driver circuitry to be approximately constant; and voltage regulator circuitry coupled with the current regulator circuitry and configured to provide the second power supply having an approximately constant voltage, the second power supply supplying current received from the first power supply through the current regulator circuitry to at least the digital data circuitry. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for data communications comprising:
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data communications transmitter circuitry configured to transmit data via a transmission line; biasing circuitry configured to bias the transmission line at a bias voltage by sinking current from a first power supply; and voltage regulator circuitry coupled with the biasing circuitry and configured to regulate an approximately constant voltage at a second power supply, the second power supply coupled with the data communications transmitter circuitry, the voltage regulator circuitry being further configured to supply current sinked by the biasing circuitry from the first power supply to the data communications transmitter circuitry via the second power supply. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for powering circuits for a communications interface comprising:
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biasing a transmission line using biasing circuitry coupled with the transmission line and configured to draw current from a first power supply; sinking the current from the first power supply through the biasing circuitry; regulating a voltage of a second power supply to be approximately constant, the second power supply configured to power circuitry for a communications interface; and supplying current sinked from the first power supply to the circuitry for the communications interface via the second power supply. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification