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Comment

Sep 5, 2006 - patent is extended or adjusted under 35. 6,670,859 B1 12/2003 ... (74) Attorney, Agent, or F irmiDorsey & Whitney, LLP. (51) Int. Cl. GIIC 7/10.

US007102932B2

(12)

United States Patent

(10) Patent N0.: US 7,102,932 B2 (45) Date of Patent: Sep. 5, 2006

Baker (54)

INPUT AND OUTPUT BUFFERS HAVING SYMMETRICAL OPERATING

5,703,519 A

FROM VOLTAGE VARIATIONS

5,898,341 A

4/1999 Miyashita ..

330/253

5,907,261 A

5/1999

Jones ...... ..

330/254

Takahashi .... ..

365/205

Inventor‘ .

(73)

.

5,982,689 A

R‘ Jacob Baker’ Bolse’ ID (Us) ,

.

Asslgn?’Z Mlcr‘m Technology’ Inc-a B0155” ID (Us) _

(*)

8/1994 Perraud .................... .. 330/252 4/1996 Moraveji et a1. . 330/267

CHARACTERISTICS AND IMMUNITY

_

(75)

5,339,044 A 5,510,754 A

*

_

_

_

11/1999

6,060,922 A

5/2000 Chow et a1. .... ..

6,204,980 B1

3/2001

6,281,731 B1

8/2001 Fi?eld et a1.

6,300,836 B1

_

Notice:

12/1997 Crook et a1. .... ..

6,525,604

B1

10/2001 2/2003

327/175

MomtaZ et a1.

360/29

327/205

Belyi ............. .. Eckert et a1.

. ... .

330/288 . . . ..

330/69

SubJectto any dlsclalmer, thetenn ofthls

6,665,354 B1

12/2003 Drapkin et a1.

patent is extended or adjusted under 35

6,670,859 B1

12/2003 Sanduleanu ................ .. 331/57

U.S.C. 154(b) by 109 days,

6,779,097 B1

8/2004 Gillingham et a1. ...... .. 711/167

6,856,197 B1

2/2005

(21)

Appl, NQ; 10/927,763

(22)

Filed.

6,956,779

B1*

10/2005

Humphrey ......... .. Tran . . . . . . . . . .

6,956,781 B1* 10/2005 Oyama Aug 27, 2004

(65)

327/387

2003/0103400 A1*

Prior Publication Data

US 2006/0044905 A1

.. 375/316

330/252 . . . . . .. 365/205

365/185.21

6/2003 Van Tran ............. .. 365/18905

* cited by examiner

Mar. 2, 2006

Primary ExamineriTuan T. Nguyen

(74) Attorney, Agent, or FirmiDorsey & Whitney, LLP (51)

(52) (58)

Int. Cl. GIIC 7/10

(2006.01)

(57)

ABSTRACT

US. Cl. ........................... .. 365/189.05; 365/185.21 Field of Classi?cation Search ......... .. 365/ 189.05,

A pair Of self_bjased di?eremjal ampli?ers having a non symmetrical topology are combined to provide a self-biased

365/185-21 See application ?le for complete search history.

diiTerential ampli?er having a symmetrical topology. Each of the combined differential ampli?ers includes a pair of

(56)

References Cited

translstors coupled to each other as a current m1rror. The current mirror transistors are coupled in series With a respec

U8. PATENT DOCUMENTS

tive one of a pair of diiTerential input transistors. A current source transistor is coupled to the diiTerential input transis tors, and it is self-biased by one of the current mirror transistors.

4,247,791 A

4,546,476 A

1/1981

Rovell ....... ..

5,045,806 A

9/1991

Yan ........... ..

5,227,671

7/1993

Ehrlich

A

5,337,090 A

307/355

10/1985 Shaw et a1. ..

372/6 330/252

. ... ... .

. . . ..

307/261

8/1994 Ogino et a1. .............. .. 348/626

36 Claims, 9 Drawing Sheets

VIN+ o—