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US 7,002,367 B2Granted
Method and apparatus for low capacitance, high output impedance driver
AssigneeRambus Inc.
InventorsLeung Yu, Roxanne T. Vu, Benedict C. Lau, Huy M. Nguyen, James A. Gasbarro
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Abstract
An apparatus is described having a feedback loop. The feedback loop has an output that approaches a steady state as a data line voltage approaches a reference voltage. The apparatus also includes a driving transistor that drives the data line. The driving transistor has an output impedance that is controlled by the feedback loop output, the feedback loop output keeps the driving transistor output impedance within a high output impedance region when the feedback loop output reaches the steady state.
Claims26
An apparatus, comprising:
- a) a feedback loop having an output that approaches a steady state as a data line voltage approaches a reference voltage;
- and
- b) a driving transistor that drives said data line, said driving transistor having an output impedance that is controlled by said feedback loop output, said feedback loop output keeping said driving transistor output impedance within a high output impedance region when said feedback loop output reaches said steady state.
A method, comprising:
- a) comparing a data line voltage with a reference voltage;
- and
- b) regulating, in response to said comparing, an output impedance of a driving transistor that drives said data line, said regulating keeping said driving transistor within a high output impedance region when said data line voltage reaches said reference voltage, said regulating approaching a steady state as said data line voltage approaches said reference voltage.
Dependencies are inferred from the claim text.