US 12,738,974 B2Granted

Can transmitter circuit with current smoothing

AssigneeTexas Instruments Incorporated

InventorsJitender Kapil, Akshay Sanadhya, Lokesh Kumar Gupta, Shishir Goyal, Deep Banerjee, Atul Kumar Singh

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Abstract

In described examples, a device includes a bias voltage circuit, an output circuit, and multiple current source circuits. A first plurality of the current source circuits is coupled between a first output of the bias voltage circuit and a first input of the output circuit. A second plurality of the current source circuits is coupled between a second output of the bias voltage circuit and a second input of the output circuit. Each of the current source circuits includes first and second resistors, first and second switches, and a transistor. The first switch is coupled between a gate of the transistor and the bias voltage circuit. The second switch is coupled between the gate of the transistor and a first terminal of the transistor. The second terminal of the transistor is coupled to the output circuit.

Claims20

Dependent claims

A device comprising:

a bias voltage circuit having a first output and a second output;
an output circuit having first and second inputs and first and second outputs;
and
multiple current source circuits each respectively having a first input, a second input, and an output, the first inputs of a first plurality of the current source circuits coupled to the first output of the bias voltage circuit, the first inputs of a second plurality of the current source circuits coupled to the second output of the bias voltage circuit, the outputs of the first plurality of the current source circuits coupled to the first input of the output circuit, and the outputs of the second plurality of the current source circuits coupled to the second input of the output circuit, each of the current source circuits including:
a first resistor having first and second terminals, the first terminal of the first resistor coupled to the first input of the current source circuit;
a second resistor having first and second terminals;
a first switch having first and second terminals and a control terminal, the first terminal of the first switch coupled to the second terminal of the first resistor;
a second switch having first and second terminals and a control terminal, the first terminal of the second switch coupled to the second terminal of the second resistor;
and
a transistor having first and second terminals and a control terminal, the first terminal of the transistor coupled to the first terminal of the second resistor and to the second input of the current source circuit, the second terminal of the transistor coupled to the output of the current source circuit, and the control terminal of the transistor coupled to the second terminal of the first switch and the second terminal of the second switch.

7 more elements

A device comprising:

a bias voltage circuit having a first output and a second output;
a first current source circuit having an input and an output, the input of the first current source circuit coupled to the first output of the bias voltage circuit;
a second current source circuit having an input and an output, the input of the second current source circuit coupled to the second output of the bias voltage circuit;
an output circuit having a first input, a second input, a third input, a first output, and a second output, the first input of the output circuit coupled to the output of the first current source circuit, and the second input of the output circuit coupled to the output of the second current source circuit;
a first transistor having a first terminal, a second terminal, and a control terminal;
a second transistor having a first terminal, a second terminal, and a control terminal;
a third transistor having a first terminal, a second terminal, and a control terminal, the first terminal of the third transistor coupled to the first terminal of the first transistor, and the control terminal of the third transistor coupled to the control terminal and the second terminal of the first transistor and to the control terminal and the first terminal of the second transistor;
a fourth transistor having a first terminal, a second terminal, and a control terminal;
a fifth transistor having a first terminal, a second terminal, and a control terminal, the second terminal of the fifth transistor coupled to the second terminal of the second transistor;
and
a sixth transistor having a first terminal, a second terminal, and a control terminal, the first terminal of the sixth transistor coupled to the first terminal of the fourth transistor, the second terminal of the sixth transistor coupled to the second terminal of the third transistor and the third input of the output circuit, and the control terminal of the sixth transistor coupled to the control terminal and the second terminal of the fourth transistor and to the control terminal and the first terminal of the fifth transistor.

8 more elements

Dependencies are inferred from the claim text.