Level shifting input buffer circuit

Details Level shifting input buffer circuit Level shifting input buffer circuit

2007-10-02

2007-10-02

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C326S063000

Reexamination Certificate

active

10964040

ABSTRACT:
An input circuit (200) operating at a predetermined power supply voltage (VPW) can level shift a high voltage input signal (VINHV) from a higher voltage value to the lower power supply voltage (VPW) level. An input circuit (200) can include input transistors (206-0and206-1) having a source-follower configuration. A first input transistor (206-0) receives a high voltage input signal (VINHV) and a second input transistor (206-1) receives a reference voltage (VREF), which can both reach levels greater than power supply voltage (VPW). A compare circuit (204) can reduce duty cycle distortion to generate a lower voltage input signal (VINLV). Input circuit (200) can provide level shifting from LVTTL levels to low voltage CMOS levels without the need for multiple power supply voltages.

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