Common mode feedback in high speed differential output circuits
OwnerHector Torres, Mark Morgan +1inventors
InventorsHector Torres, Mark Morgan, Allan Bass
Life of this patent
Estimating the term…
Abstract
A driver circuit comprises a driver portion, differential voltage input terminals, feedback circuitry, and differential voltage output terminals. The feedback circuitry connects a sample portion of the driver portion to a mixer portion of the driver portion. The sample portion may comprise an internal connection to the driver portion, for example, at a midpoint between differential outputs by the driver portion before regulation of the same differential voltages.
Claims19
A driver circuit comprising:
- differential voltage input terminals;
- a driver portion comprising a differential amplifier, a sample portion, and a mixer portion;
- feedback circuitry connecting the sample portion to the mixer portion;
- and
- differential voltage output terminals;
- wherein the sample portion has a signal point within the driver portion at which a signal is sensed for use in the feedback circuitry.
A driver circuit for driving a signal of a low voltage differential signalling (LVDS) repeater, the circuit comprising:
- differential voltage input terminals to receive a differential voltage input;
- a driver portion to drive an initial input from the differential voltage input terminals to remaining portions of the driver circuit, the driver portion comprising a differential amplifier, a sample portion from which a signal can be sampled based on the initial input, and a mixer portion into which a feedback signal is fed;
- feedback circuitry connecting the sample portion to the mixer portion;
- and
- differential voltage output terminals.
Dependencies are inferred from the claim text.