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US 8,138,806 B2Granted
Driver circuit for high voltage differential signaling
AssigneeTexas Instruments Incorporated
InventorsJayesh Gangaprasad Wadekar, Sumantra Seth, Kartik Reddy
Life of this patent
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Abstract
Driver circuit for high voltage differential signaling. The circuit includes a first positive driver that generates a first positive transition at a first output in response to an input. The circuit also includes a first current element coupled to the first positive driver to enable generation of a current. Further, the circuit includes a first negative driver coupled to the first current element, and responsive to the input and the current, due to the first current element, to generate a first negative transition, at a second output, at a rate similar to that of the first positive transition.
Claims21
A circuit comprising:
- a first positive driver that generates a first positive transition at a first output in response to an input;
- a first negative driver coupled to the first current element, and responsive to the input and the current, due to the first current element, to generate a first negative transition, at a second output, at a rate similar to that of the first positive transition;
- a first current element coupled to the first positive driver and a second negative driver;
- and
- a second current element coup led to a second positive driver and the first negative driver.
2 more elements
A circuit comprising:
- a first positive driver that generates a first positive transition at a first output in response to an input;
- a first current element coupled to the first positive driver to enable generation of a current;
- and
- a first negative driver coupled to the first current element, and responsive to the input and the current, due to the first current element, to generate a first negative transition, at a second output, at a rate similar to that of the first positive transition
- a second positive driver that is capable of generating a second positive transition at the second output in response to another input;
- a second current element coupled to the second positive driver and that is capable of enabling generation of the current;
- and
- a second negative driver coupled to the second current element and that is capable of generating a second negative transition at the first output in response to the another input and the current, due to the second current element, at a rate similar to that of the second positive transition.
5 more elements
A circuit comprising:
- a first positive driver that generates a first positive transition at a first output in response to an input;
- a first current element coupled to the first positive driver to enable generation of a current;
- a first negative driver coupled to the first current element, and responsive to the input and the current, due to the first current element, to generate a first negative transition, at a second output, at a rate similar to that of the first positive transition
- a clamp circuit coupled to the first positive driver and the first negative driver, and responsive to completion of the first positive transition and of the first negative transition to maintain voltages at a gate of the first positive driver and at a gate of the first negative driver within respective predefined range.
1 more element
A circuit comprising:
- a first positive driver that generates a first positive transition at a first output in response to an input;
- a first current element coupled to the first positive driver to enable generation of a current;
- a first negative driver coupled to the first current element, and responsive to the input and the current, due to the first current element, to generate a first negative transition, at a second output, at a rate similar to that of the first positive transition:
- a level-shifter circuit;
- and
- a pre-driver circuit, coupled to the level-shifter circuit, that in conjunction with the level-shifter circuit generates a signal to drive at least one of the first and second negative drivers.
3 more elements
A driver circuit for generating a transition at an output, the driver circuit comprising:
- a first feedback capacitor coupled to a load;
- a first driver transistor having gate coupled to the first feedback capacitor and pre-biased at a first predefined voltage to control slew rate at the output at start of a first transition in response to a first input;
- a first transistor coupled between the first feedback capacitor and drain of the first driver transistor in a cascode connection and biased at a second predefined voltage to isolate a first feedback capacitance of the first driver transistor, due to the first feedback capacitor, from gate-to-drain capacitance of the first driver transistor and to prevent voltage at a drain of the first driver transistor from exceeding a first predefined value;
- a first switch coupled to source of the first driver transistor and responsive to a first control signal to render the first driver transistor to generate the first transition at the output;
- a second feedback capacitor coupled to the load;
- a second driver transistor having gate coupled to the second feedback capacitor and biased at a third predefined voltage to control slew rate at the output at start of a second transition in response to a second input;
- a second transistor coupled between the second feedback capacitor and drain of the second driver transistor in a cascode connection and biased at a fourth predefined voltage to isolate a second feedback capacitance of the second driver transistor, due to the second feedback capacitor, from gate-to-drain capacitance of the second driver transistor and to prevent voltage at a drain of the second driver transistor from exceeding a second predefined value;
- and
- a second switch coupled to source of the second driver transistor and responsive to a second control signal to render the second driver transistor to generate the second transition at the output.
6 more elements
A method for controlling slew rate in a driver circuit, the method comprising:
- pre-charging a first driver to a first predefined voltage and a second driver to a second predefined voltage, wherein the first driver and second driver are cross coupled through a current element;
- driving a current through the first driver and the second driver;
- and
- generating a first output, by the first driver, and a second output, by the second driver, in response to an input, the second output having a slew rate equivalent to that of the first output.
1 more element
Dependencies are inferred from the claim text.