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US 6,617,886 B2Granted
Differential pair with high output signal crossover
AssigneeTexas Instruments Incorporated
InventorsWilliam J. Bright, Ranjit Gharpurey
Life of this patent
Estimating the term…
Abstract
A buffer circuit includes a differential pair output switch having an additional NPN device and resistor operational to increase the common mode output voltage of the buffer during a switching event, such that the voltage movement at the common emitter node of the differential pair output switch for the buffer circuit is decreased to substantially reduce distortion of an output signal associated with a DAC that employs the buffer circuit.
Claims9
A buffer circuit comprising:
- a common emitter differential pair output switch having a pair of transistors configured with a common emitter node;
- a current source operational to supply current to the common emitter node in response to a differential input signal applied to the common emitter differential pair output switch;
- and
- a current path control circuit connected to the common emitter node and operational to increase a common mode output voltage associated with the common emitter differential pair output switch during a switching event,
- wherein the current path control circuit comprises solely one transistor type selected from the group consisting of a MOS transistor, an HBT transistor, an NPN transistor, and a PNP transistor.
2 more elements
A buffer circuit comprising:
- a common emitter differential pair output switch having a pair of transistors configured with a common emitter node;
- a current source operational to supply current to the common emitter node in response to a differential input signal applied to the common emitter differential pair output switch;
- and
- a current oath control circuit connected to the common emitter node and operational to increase a common mode output voltage associated with the common emitter differential pair output switch during a switching event,
- wherein the current path control circuit consists of a resistor.
2 more elements
A buffer circuit comprising:
- a differential pair output switch;
- a current source operational to vary a supply current applied to the differential pair output switch in response to a differential input signal applied to the differential pair output switch;
- and
- a control circuit operational to increase a common mode output voltage associated with the differential pair output switch in response to a decreasing differential output voltage associated with the differential pair output switch caused by the differential input signal,
- wherein the control circuit comprises solely a resistive device.
2 more elements
Dependencies are inferred from the claim text.