Lower voltage switching of current mode logic circuits
AssigneeTexas Instruments Incorporated
InventorSteven Ernest FINN
Life of this patent
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Abstract
A circuit includes a first transistor comprising a first control input and first and second current terminals, the first control input coupled to receive a first input control signal, and the first current terminal coupled to a first power supply node. The circuit also includes a first resistor coupled to the first control input of the first transistor, a first capacitor coupled between the second current terminal of the first transistor and the first resistor and a second transistor comprising a second control input and third and fourth current terminals, the third current terminal coupled to the first resistor and to the first capacitor.
Claims20
A circuit, comprising:
- a first transistor comprising a first control input and first and second current terminals, the first control input coupled to receive a first input control signal, and the first current terminal coupled to a first power supply node;
- a first resistor coupled to the first control input of the first transistor;
- a first capacitor coupled between the second current terminal of the first transistor and the first resistor;
- and
- a second transistor comprising a second control input and third and fourth current terminals, the third current terminal coupled to the first resistor and to the first capacitor.
A circuit, comprising:
- a first transistor comprising a first control input and first and second current terminals, the first control input coupled to receive a first input control signal, and the first current terminal coupled to a first power supply node;
- a first resistor coupled to the first control input of the first transistor;
- a first capacitor coupled between the second current terminal of the first transistor and the first resistor;
- a second transistor comprising a second control input and third and fourth current terminals, the third current terminal coupled to the first resistor and to the first capacitor;
- a third transistor comprising a third control input and seventh and eighth current terminals, the third control input coupled to receive a second input control signal, the second input control signal being reciprocal to the first input control signal;
- and
- a second resistor coupled to the third control input;
- a second capacitor coupled between the sixth current terminal and the second resistor;
- and
- a fourth transistor comprising a fourth control input and seventh and eighth current terminals, the seventh current terminal coupled to the second resistor and to the second capacitor.
A circuit, comprising:
- a first transistor comprising a first control input and first and second current terminals, the first control input coupled to receive a time-varying first input control signal;
- a first resistor coupled to the first control input of the first transistor;
- and
- a first high pass filter coupled to the second current terminal and to the first resistor at a first output node, the first high pass filter having a first cut-off frequency;
- the voltage on the second current terminal of the first transmitter provided through the first high pass filter to the first output node at frequencies of the time-varying first input control signal above the first cut-off frequency;
- and
- at frequencies of the time-varying first input control signal below the first cut-off frequency, the voltage on the first output node being a voltage drop across the first resistor less than the time-varying first input control signal.
Dependencies are inferred from the claim text.