Integrated low voltage differential signaling (LVDS) and high-speed current steering logic (HCSL) circuit and method of use
First Claim
1. An integrated circuit comprising:
- a low voltage differential signaling (LVDS) output circuit;
a high-speed current steering logic (HCSL) output circuit;
a bias control circuit;
a programmable voltage reference circuit coupled to the bias control circuit;
an output stage circuit coupled to the HCSL output circuit;
a first plurality of switches to switchably couple the bias control circuit to the LVDS output circuit; and
a second plurality of switches to switchably couple the bias control circuit to the output stage circuit and to the HCSL output circuit.
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Accused Products
Abstract
An integrated circuit includes a low voltage differential signaling (LVDS) output circuit, a high-speed current steering logic (HCSL) output circuit, a bias control circuit, a programmable voltage reference circuit coupled to the bias control circuit, an output stage circuit coupled to the HCSL output circuit, a first plurality of switches to switchably couple the bias control circuit to the LVDS output circuit, a second plurality of switches to switchably couple the bias control circuit to the output stage circuit and to the HCSL output circuit and a logic control circuit coupled to the programmable voltage reference circuit, the first plurality of switches and the second plurality of switches. The logic control circuit is configured to activate either the LVDS output circuit or the HCSL output circuit.
129 Citations
19 Claims
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1. An integrated circuit comprising:
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a low voltage differential signaling (LVDS) output circuit; a high-speed current steering logic (HCSL) output circuit; a bias control circuit; a programmable voltage reference circuit coupled to the bias control circuit; an output stage circuit coupled to the HCSL output circuit; a first plurality of switches to switchably couple the bias control circuit to the LVDS output circuit; and a second plurality of switches to switchably couple the bias control circuit to the output stage circuit and to the HCSL output circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An integrated circuit comprising:
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a low voltage differential signaling (LVDS) output circuit; a high-speed current steering logic (HCSL) output circuit; a bias control circuit; a programmable voltage reference circuit coupled to the bias control circuit; an output stage circuit coupled to the HCSL output circuit; a first plurality of switches to switchably couple the bias control circuit to the LVDS output circuit; a second plurality of switches to switchably couple the bias control circuit to the output stage circuit and to the HCSL output circuit; and a logic control circuit coupled to the programmable voltage reference circuit, the first plurality of switches and the second plurality of switches, the logic control circuit to activate either the LVDS output circuit or the HCSL output circuit.
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13. A method comprising:
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providing a voltage reference signal from a programmable voltage reference circuit to a bias control circuit based upon a desired output signaling mode by providing a bandgap current reference signal from a bandgap reference circuit to the programmable voltage reference circuit and providing a control signal from a logic control circuit to the programmable voltage reference circuit, wherein the control signal is based upon the desired output signaling mode and wherein the desired output signaling mode is either a low voltage differential signaling (LVDS) output signaling mode or a high-speed current steering logic (HCSL) output signaling mode; coupling the bias control circuit to a LVDS output circuit if the desired output signaling mode is an LVDS output signaling mode or coupling the bias control circuit to a HCSL output circuit if the desired output signaling mode is an HCSL output signaling mode; and coupling the bias control circuit to an output stage circuit coupled to the HCSL output circuit if the desired output signaling mode is an HCSL output signaling mode. - View Dependent Claims (14, 15)
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16. A method comprising:
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providing a voltage reference signal from a programmable voltage reference circuit to a bias control circuit based upon a desired output signaling mode, wherein the desired output signaling mode is either a low voltage differential signaling (LVDS) output signaling mode or a high-speed current steering logic (HCSL) output signaling mode; coupling the bias control circuit to a LVDS output circuit if the desired output signaling mode is an LVDS output signaling mode or coupling the bias control circuit to a HCSL output circuit by providing a common mode feedback path between the bias control circuit and the HCSL output circuit if the desired output signaling mode is an HCSL output signaling mode; and coupling the bias control circuit to an output stage circuit coupled to the HCSL output circuit if the desired output signaling mode is an HCSL output signaling mode. - View Dependent Claims (17, 18, 19)
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Specification