Capacitor current multiplier capacitive feedback circuit
AssigneeIntel Corporation
InventorRobert James Johnston
Life of this patent
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Abstract
Various methods and apparatuses that multiply the effects of feedback current on an amplifier. In an embodiment, a buffer circuit controls the transition rate on an output pad of the buffer circuit. An amplifier has an input terminal and an output terminal. The output terminal couples to the output pad. A feedback component couples feedback current from the output pad to the input terminal. A current mirror multiplies the effects of the feedback current on the input terminal without increasing the feedback current through the feedback component.
Claims22
An apparatus comprising:
- a buffer circuit to control the transition rate on an output pad of the buffer circuit;
- a first amplifier having an input terminal and an output terminal, the output terminal coupled to the output pad;
- feedback component to couple feedback current from the output pad to the input terminal;
- and
- current mirror to multiply effects of the feedback current on the input terminal without increasing the feedback current through the feedback component.
A controlled slew rate buffer circuit, comprising:
- a capacitor coupled between an output terminal of the buffer circuit and a input terminal of a first driver amplifier;
- and
- a first current mirror coupled to the capacitor and between the input terminal and the output terminal.
A method, comprising:
- controlling impedance of an output stage to obtain a predetermined rate of change of voltage at the output stage through use of capacitive feedback between the output stage and a pre-driver circuit;
- and
- mirroring current flow through the capacitive feedback and then multiplying the mirrored current flow.
An apparatus, comprising:
- means for controlling impedance of an output stage to obtain a predetermined rate of change of voltage at the output stage through use of capacitive feedback between the output stage and a pre-driver circuit;
- and
- means for mirroring current flow through the capacitive feedback and then multiplying the mirrored current flow.
An apparatus, comprising:
- an impedance controller to obtain a predetermined rate of change of voltage at an output stage through use of capacitive feedback between the output stage and a pre-driver circuit;
- and
- a current mirror to multiply the effects of the capacitive feedback on the pre-driver circuit in order to decrease a capacitance value of a feedback capacitor used to achieve the predetermined rate of change of voltage.
Dependencies are inferred from the claim text.