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Low voltage rail-to-rail CMOS output stage

  • US 6,353,363 B1
  • Filed: 02/29/2000
  • Issued: 03/05/2002
  • Est. Priority Date: 02/29/2000
  • Status: Expired due to Term
First Claim
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1. An output stage suitable for low voltage operation and capable of providing a substantially symmetrical rail-to-rail output voltage, the output stage comprising:

  • a first field effect device having a first source, first drain, and first gate, the first source being coupled to a power supply VCC;

    a second field effect device complementary to the first field effect device, wherein the second field effect device includes a second source, second drain, and second gate, and wherein the second source is coupled to a power supply having a nominal voltage supply of VEE and wherein the second drain is coupled to the first drain;

    an output sink network coupled to the second gate, wherein the output sink network drives the second field effect device such that a product of a first current in the first field effect device and a second current in the second field effect device is essentially equal to a predetermined constant during operation of the out put stage; and

    said first and second field effect devices and said output sink network producing a symmetrical rail-to-rail output voltage of no more than on VGS and two VDSAT from either rail.

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