Document:

Exhibit 10.1

SILICON LABORATORIES INC.

AMENDMENT TO STOCK OPTIONS AGREEMENT

This Amendment to Stock Options Agreement (this “Amendment”)
dated effective as of July 19, 2007 is entered into between Silicon
Laboratories Inc. (the “Corporation”) and William G. Bock (“Optionee”).

WHEREAS, by their original
terms, certain stock options held by Optionee would cease to be exercisable on
November 8, 2007 (the expiration of the 12-month period measured from Optionee’s
cessation of Board service).

WHEREAS, Optionee is continuing
to provide Service to the Corporation and Optionee and the Corporation intend
that the exercisability of those stock options that were held by Optionee and
vested upon Optionee’s cessation of Board service should be tied to Service (as
defined in Plan) rather than Board service.

NOW, THEREFORE, it is hereby
agreed as follows:

1.             Amendment
of Options. 
This Amendment amends the terms of Stock Option Agreements listed below
(the “Option Agreements”):

	
  

  	
  Grant No.

  	
   

  	
   

  	
  Grant Date

  	
   

  	
  Number of Shares

  	
   

  	
  Exercise Price

  	
   

  
	
  2000119

  	
   

  	
  3/23/2000

  	
   

  	
   

  	
  23,000

  	
   

  	
   

  	
   

  	
  $

  	
  31.00

  	
   

  	
   

  
	
  2000678

  	
   

  	
  4/24/2002

  	
   

  	
   

  	
  5,000

  	
   

  	
   

  	
   

  	
  $

  	
  30.15

  	
   

  	
   

  
	
  2000998

  	
   

  	
  4/24/2003

  	
   

  	
   

  	
  5,000

  	
   

  	
   

  	
   

  	
  $

  	
  31.15

  	
   

  	
   

  
	
  2001811

  	
   

  	
  12/10/2004

  	
   

  	
   

  	
  5,000

  	
   

  	
   

  	
   

  	
  $

  	
  31.77

  	
   

  	
   

  
	
  2001876

  	
   

  	
  4/21/2005

  	
   

  	
   

  	
  5,000

  	
   

  	
   

  	
   

  	
  $

  	
  31.23

  	
   

  	
   

  
	
  2001405

  	
   

  	
  4/29/2004

  	
   

  	
   

  	
  5,000

  	
   

  	
   

  	
   

  	
  $

  	
  50.03

  	
   

  	
   

  

 

Section 5 of
each of the Option Agreements is hereby amended and restated in its entirety as
follows:

“Cessation of Service.  The option term specified in Paragraph 2
shall terminate (and this option shall cease to be outstanding) prior to the
Expiration Date should any of the following provisions become applicable:

(i)            Should Optionee
cease to remain in Service for any reason (other than death, Permanent
Disability or Misconduct) while this option is outstanding, then this option
shall remain exercisable until the earlier of (i) the expiration of
the three (3)-month period measured from the date of such cessation of Service
or (ii) the Expiration Date.

(ii)           Should Optionee die
while holding this option, then Optionee’s Beneficiary shall have the right to
exercise this option until the earlier of (A) the expiration of the
twelve (12)-month period measured from the date of Optionee’s death or
(B) the Expiration Date.

(iii)          Should Optionee
cease Service by reason of Permanent Disability while this option is
outstanding, then this option shall remain exercisable until the earlier of
(i) the expiration of the twelve (12)-month period measured from the date
of such cessation of Service or (ii) the Expiration Date.

(iv)          During the
applicable post-Service exercise period, this option may not be exercised in
the aggregate for more than the number of vested Option Shares for which the
option is exercisable on the date of Optionee’s cessation of Service.  Upon the expiration of the applicable
exercise period or (if earlier) upon the Expiration Date, this option shall
terminate and cease to be outstanding for any vested Option Shares for which
the option has not been exercised. 
However, this option shall, immediately upon Optionee’s cessation of
Service for any reason, terminate and cease to be outstanding to the extent
this option is not otherwise at that time exercisable for vested shares.

(v)           Should Optionee’s
Service be terminated for Misconduct or should Optionee engage in Misconduct
while this option is outstanding, then this option shall terminate immediately
and cease to be outstanding.”

2.             Acknowledgement.  Optionee has consulted with Optionee’s own
tax and legal advisors regarding this Amendment and is not relying upon the
Corporation for any advice in connection herewith.

3.             Full Effect.  Except as amended by this Amendment, the
remaining terms of the Option Agreement shall remain in full force and
effect.  All capitalized terms in this
Amendment shall have the meaning assigned to them in the Option Agreement
unless otherwise defined herein.

IN WITNESS WHEREOF, the parties have executed this
Amendment to be effective as of the date first set forth above.

Silicon
Laboratories Inc.

	
  By:

  	
   

  	
  /s/ Diane M. Williams

  	
   

  	
   

  
	
  Name:

  	
   

  	
  Diane M. Williams

  	
   

  	
   

  
	
  Title:

  	
   

  	
  Sr. Director of Human Resources

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
  /s/ William G. Bock

  	
   

  	
   

  
	
  William G. Bock

  	
   

  	
   

  

 

 2Exhibit
10.1

FOURTH
AMENDMENT

TO

AAR CORP. STOCK BENEFIT PLAN

WHEREAS, the Company maintains
the AAR CORP. Stock Benefit Plan, amended and restated effective
October 1, 2001 and further amended effective June 26, 2003,
April 11, 2005, and July 12, 2005 (the “Plan”); and

WHEREAS, the Company now desires
to further amend the Plan to revise the definition of Retirement;

NOW THEREFORE, the Company
hereby amends the first paragraph of Section 2.21 of the Plan as follows,
effective as of June 1, 2006:

“2.21  “Retirement” means the
voluntary termination by the Key Employee, or a termination by the Company
without Cause of a Key Employee, who, at the date of such termination of
employment, is at least (i) age sixty-five (65) or
(ii) age fifty-five (55) and whose age plus the number of
consecutive years of employment with the Company is at least equal to seventy-five (75).  Notwithstanding the preceding sentence, with
respect to a grant of an Award made to a Key Employee on or before May 31,
2006, Retirement shall also include the voluntary termination of employment of
a Key Employee who is at least fifty-five (55) years of age and
whose age, at the date of such termination, plus the number of consecutive
years of employment with the Company is at least equal to sixty-two (62).”

IN WITNESS WHEREOF, this Fourth
Amendment has been executed on this 23rd day of June, 2006.

	
  

  	
   

  	
  AAR CORP.

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  /s/ Timothy O. Skelly

  
	
   

  	
   

  	
   

  	
   

  

FIFTH AMENDMENT

TO

AAR CORP.
STOCK BENEFIT PLAN

WHEREAS, the Company maintains
the AAR CORP. Stock Benefit Plan, amended and restated effective October 1,
2001 and further amended effective June 26, 2003, April 11, 2005, July 12,
2005, and June 1, 2006 (the “Plan”); and

WHEREAS, the Company now desires
to further amend the Plan to require that any grants/awards made to the
Chairman, President and CEO be recommended by the Compensation Committee and
approved by the Board of Directors;

NOW THEREFORE, the Company
hereby amends Section 3.2 of the Plan as follows, effective as of January 23,
2007:

“3.2         The
Committee shall have plenary authority with respect to Key Employees, subject
to the provisions of the Plan, to determine when and to whom Awards shall be
granted, the Term of each Award, the number of Shares covered by it, the effect
of participation by the Grantee in other plans, and any other terms or
conditions of each such Award.  The
number of Shares, the Term and other terms and conditions of a particular kind
of Award need not be the same even as to Awards made at the same time.  The Committee’s actions in making Awards and
fixing their size, Term, and other terms and conditions shall be conclusive on
all persons, except in the case of Awards to the Chairman, President and CEO of
the Company, where recommendations will be made by the Compensation Committee
and approved by the Board of Directors.”

IN
WITNESS WHEREOF, this Fifth Amendment has been executed as of
the 23rd day of January, 2007.

	
  

  	
   

  	
  AAR CORP.

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  /s/ Timothy O. Skelly

  
	
   

  	
   

  	
   

  	
  Timothy O. Skelly, Vice PresidentExhibit
10.5

FIRST AMENDMENT TO

AAR CORP.
SUPPLEMENTAL KEY EMPLOYEE RETIREMENT PLAN

(As
Amended and Restated Effective January 1, 2005)

WHEREAS, AAR
CORP., a Delaware corporation (the “Company”), maintains the AAR CORP.
Supplemental Key Employee Retirement Plan, as amended and restated effective
January 1, 2005 (the “Plan”); and

WHEREAS, pursuant
to Section 7.1, the Company has reserved the right to amend the Plan and now
deems it appropriate to do so.

NOW,
THEREFORE, the Plan is hereby amended, effective April 18,
2007, as follows:

1.                                       By
amending Section 1.11 to read as follows:

“1.11       “Normal
Retirement Date” shall mean the first day of the calendar month coincident with
or next following a Participant’s “Normal Retirement Age”, as that term is
defined in the AAR CORP. Retirement Plan.”

2.                                       By
amending the Vesting provision in the Appendix to read as follows:

“Vesting

An applicable Participant shall fully vest in the
balance of his Additional Supplemental Company Account upon the earlier of the
date Participant attains calendar year age 65 or the date a Participant’s
calendar year age plus Years of Service equals 75.”

IN
WITNESS WHEREOF, the Company has caused this First Amendment
to be executed on its behalf, by its officer, duly authorized, on this 11th day
of July, 2007.

	
  

  	
  AAR CORP.

  	
   

  	 

	
   

  	
   

  	
   

  	 

	
   

  	
   

  	
   

  	 

	
   

  	
  By:

  	
    /s/ Timothy O. Skelly

  	
   

  
	
   

  	
   

  	
  Timothy O. Skelly, Vice President

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