Dynamic pull-down circuits for bidirectional voltage translators
AssigneeTexas Instruments Incorporated
InventorsAnkur Kumar Singh, Kanteti Amar, Rashmi Shahu
Life of this patent
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Abstract
An example apparatus includes: an output terminal, pull-down circuitry coupled to the output terminal, the pull-down circuitry including: a resistor with a first resistor terminal and a second resistor terminal, the first resistor terminal coupled to the output terminal, a capacitor with a first capacitor terminal and a second capacitor terminal, the first capacitor terminal coupled to the output terminal, a first transistor coupled to the second resistor terminal, a second transistor coupled to the first transistor and the second resistor terminal, and a third transistor coupled to the second transistor.
Claims15
An apparatus comprising:
- pull-down circuitry having an output and a first input, a second input and a third input, the pull-down circuitry including:
- a resistor with a first resistor terminal and a second resistor terminal, the first resistor terminal coupled to the output;
- a capacitor with a first capacitor terminal and a second capacitor terminal, the first capacitor terminal coupled to the output and the second capacitor terminal coupled to ground;
- a first transistor having a first current terminal, a second current terminal and a control terminal, wherein the first current terminal of the first transistor is coupled to the second resistor terminal, the second current terminal of the first transistor is coupled to ground and the control terminal of the first transistor is coupled to the first input;
- a second transistor having a first current terminal, a second current terminal and a control terminal, wherein the first current terminal of the second transistor is coupled to the second resistor terminal and the control terminal of the second transistor is coupled to the second input;
- and
- a third transistor having a first current terminal, a second current terminal and a control terminal wherein the first current terminal of the third transistor is coupled to the second current terminal of the second transistor, the second current terminal of the third transistor is coupled to ground and the control terminal of the third transistor is coupled to the third input.
A transceiver comprising:
- first transceiver path circuitry having a first input, and output;
- and
- second transceiver path circuitry coupled to the first input and the output, and having a second input and a third input, the second transceiver path circuitry including:
- a resistor with a first resistor terminal and a second resistor terminal, the first resistor terminal coupled to the output;
- a capacitor with a first capacitor terminal and a second capacitor terminal, the first capacitor terminal coupled to the output and the second capacitor terminal coupled to ground;
- a first transistor having a first current terminal, a second current terminal and a control terminal, wherein the first current terminal of the first transistor is coupled to the second resistor terminal, the second current terminal of the first transistor is coupled to ground and the control terminal of the first transistor is coupled to the first input;
- a second transistor having a first current terminal, a second current terminal and a control terminal, wherein the first current terminal of the second transistor is coupled to the second resistor terminal and the control terminal of the second transistor is coupled to the second input;
- and
- a third transistor having a first current terminal, a second current terminal and a control terminal wherein the first current terminal of the third transistor is coupled to the second current terminal of the second transistor, the second current terminal of the third transistor is coupled to ground and the control terminal of the third transistor is coupled to the third input.
Dependencies are inferred from the claim text.