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CMOS differential amplifier for a delta sigma modulator applicable for an analog-to-digital converter

  • US 6,018,262 A
  • Filed: 04/27/1998
  • Issued: 01/25/2000
  • Est. Priority Date: 09/30/1994
  • Status: Expired due to Term
First Claim
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1. A CMOS differential amplifier comprising:

  • a CMOS operational amplifier; and

    at least one amplitude-limiting circuit connected between an input terminal and an output terminal of said CMOS operational amplifier, wherein said at least one amplitude-limiting circuit comprises first and second PMOS transistors and first and second NMOS transistors, wherein said first PMOS transistor and said first NMOS transistor are connected in parallel to said second PMOS transistor and said second NMOS transistor,wherein said first PMOS transistor and said first NMOS transistor each further comprise a drain, a source, and gate,wherein said the source of said first PMOS transistor and the drain of said first NMOS transistor are commonly connected to the input terminal of said CMOS operational amplifier and the gates of both of said first PMOS transistor and said first NMOS transistor are commonly connected to the input terminal of said CMOS operational amplifier,wherein said second PMOS transistor and said second NMOS transistor each further comprise a drain, a source, and gate, andwherein said the source of said second PMOS transistor and the drain of said second NMOS transistor are commonly connected to the output terminal of said CMOS operational amplifier and the gates of both of said second PMOS transistor and said second NMOS transistor are commonly connected to the output terminal of said CMOS operational amplifier.

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