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US 12,278,625 B2Granted
Driver circuit
AssigneeNippon Telegraph and Telephone Corporation
InventorsTeruo Jo, Munehiko Nagatani, Hideyuki Nosaka
Life of this patent
Estimating the term…
Abstract
The driver circuit includes DC cut capacitors, an input buffer, input termination resistors connected in series between differential input signal terminals and an ESD protection circuit connected to a connection point of the input terminal resistors. The ESD protection circuit includes diodes.
Claims8
A driver circuit comprising:
- a first input signal terminal;
- a second input signal terminal;
- an Electro-Static Discharge protection circuit connected to the first input signal terminal and the second input signal terminal;
- a first capacitor and a second capacitor each having a first end connected to the Electro-Static Discharge protection circuit;
- and
- an input buffer having a first input terminal and an inverting input terminal, the first input terminal of the input buffer being connected to a second end of the first capacitor and the inverting input terminal connected to a second end of the second capacitor of the input buffer, wherein the Electro-Static Discharge protection circuit includes:
- a plurality of first diodes each having a cathode connected to a power supply voltage;
- a plurality of second diodes each having anodes connected to ground;
- a first transmission line having an input end connected to the first input signal terminal and an output end connected to the first end of the first capacitor;
- a second transmission line having an input end connected to the second input signal terminal and an output end connected to the first end of the second capacitor;
- a plurality of first input termination resistors arranged along the first transmission line and having a first end connected to the first transmission line;
- and
- a plurality of second input termination resistors arranged along the second transmission line and having a first end connected to the second transmission line and a second end connected to a second end of the first input termination resistor.
10 more elements
A driver circuit comprising:
- a first output signal terminal;
- a second output signal terminal;
- an output circuit having a first output terminal connected to the first output signal terminal and a second output terminal connected to the second output signal terminal;
- a first Electro-Static Discharge protection circuit connected to the first output signal terminal and the second output signal terminal, wherein the output circuit includes:
- a first transistor and a second transistor each having a base terminal to which a differential signal is input;
- a third transistor having a collector terminal connected to the first output signal terminal and an emitter terminal connected to a collector terminal of the first transistor;
- and
- a fourth transistor having a collector terminal connected to the second output signal terminal and an emitter terminal connected to the collector terminal of the second transistor;
- and
- a second Electro-Static Discharge protection circuit connected to a base terminal of the third transistor and a base terminal of the fourth transistor, wherein the second Electro-Static Discharge protection circuit includes:
- a first diode having an anode connected to ground and a cathode connected to the base terminal of the third transistor;
- and
- a second diode having an anode connected to ground and a cathode connected to the base terminal of the fourth transistor.
10 more elements
Dependencies are inferred from the claim text.