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US 8,803,611 B2Granted
Current mode logic circuit and method
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorWei Chih Chen
Life of this patent
Estimating the term…
Abstract
A circuit includes a bias generating circuit, an operational amplifier, and a current mode logic circuit. The operational amplifier has a first input terminal, a second input terminal, and an output terminal. The bias generating circuit is configured to provide a first bias voltage to the first terminal. The second terminal is configured to receive a second bias voltage. The second terminal and the output terminal are configured to form a negative feedback loop. The output terminal is coupled with the current mode logic circuit.
Claims20
A circuit comprising:
- a bias generating circuit;
- an operational amplifier having a first input terminal, a second input terminal, and an output terminal;
- a first resistive device and a second resistive device, wherein a first end of each first resistive device and second resistive device is configured to receive a supply voltage, resulting in a first current flowing through the first resistive device and the first input terminal and a second current flowing through the second resistive device and the second input terminal;
- and
- a current mode logic circuit,
- wherein
- the bias generating circuit is configured to provide a first bias voltage to the first terminal;
- the second input terminal is configured to receive a second bias voltage;
- the second input terminal and the output terminal are configured to form a negative feedback loop;
- and
- the output terminal is coupled with the current mode logic circuit.
8 more elements
A circuit comprising:
- a current source;
- a first current mirror;
- an adjustment circuit;
- and
- a current mode logic circuit,
- wherein
- the current source is configured to provide a first current on a first current path;
- the adjustment circuit comprises a second current path coupled with a first input terminal of the adjustment circuit and a third current path coupled with a second input terminal of the adjustment circuit;
- the second current path comprises a first resistance value and a second current;
- the third current path comprises a second resistance value and a third current;
- the first current mirror is configured to minor the first current to the second current;
- the adjustment circuit is configured to adjust at least one of the first resistance value, the second resistance value, the second current, or the third current such that a voltage at the first input terminal is substantially equal to a voltage at the second input terminal;
- and
- a current path of the current mode logic circuit carries a current having a current value substantially equal to a current value of the third current.
11 more elements
A circuit comprising:
- a current source;
- a first current mirror;
- a second current mirror;
- an operational amplifier;
- a first resistive device;
- a second resistive device;
- a first transistor;
- and
- a current mode logic circuit,
- wherein
- the current source is configured to generate a reference current;
- the first current mirror is configured to mirror the reference current to a first current;
- the second current mirror is configured to mirror the first current to a second current flowing between a supply voltage node, the first resistive device, and a first terminal of the operational amplifier;
- the operational amplifier includes a third current flowing between the supply voltage node, the second resistive device, and a second terminal of the operational amplifier;
- the operational amplifier, the first transistor, and a second transistor are configured to form a feedback loop between the second terminal and an output terminal of the operational amplifier;
- and
- an output of the operational amplifier is configured to control the current mode logic circuit.
14 more elements
Dependencies are inferred from the claim text.