Output buffer circuit
First Claim
1. An output buffer circuit with a compensation capacitive load, comprising:
- an input part having two input terminal receiving differential input voltage signals;
an output part increasing a gain of the differential input voltages;
a current source biasing the output part; and
a slew rate increasing part connected to the output part and the compensation capacitive load, the slew rate increasing part including a switching element to be turned off so as to increase a slew rate of the output buffer circuit when upslewing or downslewing differential input voltages are received;
wherein the differential input voltages are settling differential input voltages; and
wherein the slew rate increasing part turns on the switching element when the settling differential input voltages are received.
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Accused Products
Abstract
Provided is an output buffer circuit having a slew rate increasing part configured with a switching element. The output buffer circuit can obtain an output voltage having a high slew rate even though a smaller amount of a bias current than that required in a conventional output buffer is used. Therefore, the output buffer circuit can reduce power consumption. In the output buffer circuit with a compensation capacitive load, an input part has two input terminal receiving differential input voltage signals, and an output part increases a gain of the differential input voltages. A current source biases the output part, and a slew rate increasing part is connected to the output part and the compensation capacitive load. The slew rate increasing part includes a switching element to increase a slew rate of the output buffer circuit.
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Citations
12 Claims
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1. An output buffer circuit with a compensation capacitive load, comprising:
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an input part having two input terminal receiving differential input voltage signals; an output part increasing a gain of the differential input voltages; a current source biasing the output part; and a slew rate increasing part connected to the output part and the compensation capacitive load, the slew rate increasing part including a switching element to be turned off so as to increase a slew rate of the output buffer circuit when upslewing or downslewing differential input voltages are received; wherein the differential input voltages are settling differential input voltages; and wherein the slew rate increasing part turns on the switching element when the settling differential input voltages are received.
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2. An output buffer circuit with a compensation capacitive load, comprising:
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an input part having two input terminals receiving differential input voltage signals; an output part increasing a gain of the differential input voltages; a floating current source biasing the output part; a summing circuit connected to the input part and the floating current source, the summing circuit being configured to sum a current supplied from the input part and an internal current supplied from the floating current source; and a slew rate increasing part connected to the input part and the summing circuit, the slew rate increasing part including a plurality of switching elements to increase a slew rate of the output buffer circuit. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification