Transmitter power supply with selective source and regulation
First Claim
Patent Images
1. An apparatus for powering an electrical circuit, comprising:
- a first voltage input configured to receive power from a first voltage source;
a second voltage input configured to receive power from a second voltage source, wherein the second voltage source has a lower constant voltage than the first voltage source;
a voltage regulator connected to the first voltage input; and
a first voltage output configured to switchably receive first constant regulated power from the first voltage input through the voltage regulator or constant unregulated power from the second voltage input based on a length of a single data channel connected to the first voltage output, and to power the electrical circuit,wherein the first voltage output receives the first constant regulated power from the first voltage input through the voltage regulator when the length of the single data channel is greater than a threshold length, andwherein the first voltage output receives the constant unregulated power from the second voltage input when the length of the single data channel is less than or equal to the threshold length.
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Abstract
An apparatus for powering an electrical circuit includes a first voltage input configured to receive power from a first voltage source, a second voltage input configured to receive power from a second voltage source, wherein the second voltage source has a lower voltage than the first voltage source, a voltage regulator connected to the first voltage input, and a voltage output configured to switchably receive power from the first voltage input through the voltage regulator or from the second voltage input.
9 Citations
20 Claims
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1. An apparatus for powering an electrical circuit, comprising:
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a first voltage input configured to receive power from a first voltage source; a second voltage input configured to receive power from a second voltage source, wherein the second voltage source has a lower constant voltage than the first voltage source; a voltage regulator connected to the first voltage input; and a first voltage output configured to switchably receive first constant regulated power from the first voltage input through the voltage regulator or constant unregulated power from the second voltage input based on a length of a single data channel connected to the first voltage output, and to power the electrical circuit, wherein the first voltage output receives the first constant regulated power from the first voltage input through the voltage regulator when the length of the single data channel is greater than a threshold length, and wherein the first voltage output receives the constant unregulated power from the second voltage input when the length of the single data channel is less than or equal to the threshold length. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 20)
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13. A method for powering a transmitter, comprising:
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determining whether a constant high amplitude voltage or a constant low amplitude voltage is needed to power the transmitter based on a length of a single data channel connected to an output of the transmitter; when the constant high amplitude voltage is needed, switching off a low voltage supply input, switching on a high voltage supply input, and enabling voltage regulation of constant regulated power from the high voltage supply input to yield a voltage output having the constant high amplitude voltage; when the constant low amplitude voltage is needed, switching off the high voltage supply input, disabling the voltage regulation of the constant regulated power from the high voltage supply input, switching on the low voltage supply input, and passing the constant low amplitude voltage from the low voltage supply input to the voltage output; and powering the transmitter with the voltage output, wherein the constant high amplitude voltage is needed when the length of the single data channel is greater than a threshold length, and wherein the constant low amplitude voltage is needed when the length of the single data channel is less than or equal to the threshold length. - View Dependent Claims (14, 15, 16, 17)
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18. A device comprising:
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a power supply for selecting from a first supply voltage and a second supply voltage based on a length of a single data channel, enabling and disabling a voltage regulator connected to the first supply voltage based on the selecting, and i) providing a constant regulated output voltage derived from the voltage regulator to an output of the power supply if the length of the single data channel is above a threshold length or ii) providing a constant unregulated voltage from the second supply voltage to the output of the power supply if the length of the single data channel is at or below the threshold length; a serializer for converting a parallel data signal to a serial data signal; and a transmitter for driving a signal derived from the serial data signal over the single data channel, wherein the transmitter is powered by the output of the power supply. - View Dependent Claims (19)
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Specification