Document:

Exhibit 10.33

JOINDER AGREEMENT

This
Joinder Agreement (this “Agreement”) is by
and between VI ACQUISITION
CORP., a Delaware corporation
(the “Company”) and JEFFRY
L. GUIDO (“Guido”).

RECITALS

A.            Pursuant to the terms of a
Management Agreement between the Company and Guido dated of even date herewith
(the “Management Agreement”), Guido is acquiring from the Company 10,948 shares
of the Company’s Common Stock, par value $4.53 per share Common Stock.

B.            The Company requires execution of
this Joinder Agreement as a condition to the sale of the shares under the
Management Agreement.

NOW,
THEREFORE, in consideration of the foregoing and for other good and valuable
consideration, the receipt and sufficiency of which are acknowledged by the
parties hereto, the parties agree as follows:

1.             Registration Rights Agreement

a.             Guido is hereby made a party to the
Registration Rights Agreement dated as of June 13, 2003, by and among the
Company and the other parties thereto (the “Registration Rights Agreement”) in
the capacity of an “Executive” (as such term is defined in the Registration
Rights Agreement), and Guido hereby agrees to be bound by all of the terms and
conditions set forth in the Registration Rights Agreement applicable to Guido
as an Executive, as to all shares purchased under the Management Agreement.

b.             Guido shall execute a signature
page to the Registration Rights Agreement in the form attached hereto as Schedule
1.b., which signature page shall be attached to and made a part of the
Registration Rights Agreement.

c.             The Schedule of Security Holders to
the Registration Rights Agreement shall hereby be replaced with Schedule 1.c
attached hereto.

2.             Stockholders Agreement

a.             Guido is hereby made a party to the
Stockholders Agreement dated as of June 13, 2003, by and among the Company
and the other parties thereto (the “Stockholders Agreement”) in the capacity of
an “Executive” and a “Stockholder” (as such terms are defined in the
Stockholders Agreement), and Guido hereby agrees to be bound by all of the
terms and conditions set forth in the Stockholders Agreement 

applicable to him
as an Executive and a Stockholder, as to all shares purchased under the
Management Agreement.

b.             Guido shall execute a signature
page to the Stockholders Agreement in the form attached hereto as Schedule 2,
which signature page shall be attached to and made a part of the Stockholders
Agreement.

3.             The Agreement is binding upon the
parties hereto and their permitted successors and assigns.

4.             This Agreement may be executed in
one or more counterparts, and by facsimile signature, each of which shall be
deemed an original, but all of which when taken together, shall constitute one
and the same instrument.

5.             This Agreement shall be governed by
and construed in accordance with the laws of the State of Delaware.

IN WITNESS WHEREOF, the
parties have executed this Agreement as of the               day
of May, 2006.

	
  Company:

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
  VI ACQUISITION CORP.

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
  By:

  	
   

  	
   

  	
   

  
	
   

  	
  Debra Koenig, President

  	
   

  	
  JEFFRY L. GUIDO

  

 

 2

SCHEDULE
1.b.

	
  

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
  

  	
   

  	
  JEFFRY L. GUIDO

  	
   

  

 

VI Acquisition
Corp.

Registration Rights Agreement

Joinder Signature Page

SCHEDULE
1.c

SCHEDULE OF SECURITY HOLDERS

WIND
POINT PARTNERS IV, L.P.

WIND
POINT PARTNERS V, L.P.

WIND
POINT IV EXECUTIVE ADVISOR PARTNERS, L.P.

WIND
POINT ASSOCIATES IV, LLC

676 N. Michigan
Avenue, Suite 3700

Chicago, IL 60611

Fax:  (312) 255-4820

Tel.: (312)
255-4800

Attn.:   Michael J. Solot

With a
copy to:

Sachnoff & Weaver,
Ltd.

30 S. Wacker
Drive, 29th Floor

Chicago, Illinois
60606

Fax:  (312) 207-1000

Tel:  (312) 207-6400

Attn:   Seth M. Hemming, Esq.

MID
OAKS INVESTMENTS LLC

750 Lake Cook
Road, Suite 440

Buffalo Grove,
Illinois  60089

Fax:  (847) 215-3421

Tel:  (847) 215-3420

Attn:   Wayne C.
Kocourek

With a copy to:

GREENBERG
TRAURIG, LLP

77 West Wacker
Drive

Suite 2500

Chicago,
Illinois  60601

Fax:  (312) 456-8435

Tel:  (312) 456-8400

Attn:   David W.
Schoenberg

A.G. EDWARDS PRIVATE EQUITY
PARTNERS QP II, L.P.

A.G. EDWARDS PRIVATE EQUITY
PARTNERS II, L.P.

A.G. Edwards
Capital, Inc.

One North
Jefferson

St. Louis, MO  63103

Fax:  (314) 955-8095

Tel:  (314) 955-3971

Attn:   Patricia
A. Dahl

WALTER VAN BENTHUYSEN

17 Tartan Lakes Ct.

Westmont, IL 
60559

ALLIED CAPITAL CORPORATION

401 N. Michigan Ave., Suite 2050

Chicago, IL 
60611

Attn:  Ed Ross,
Managing Director

With a copy to:

Moore & Van Allen PLLC

100 North Tryon Street, Suite 4700

Charlotte, North Carolina 28202

Attn:  John
Chinuntdet

GLEACHER MEZZANINE FUND I,
L.P.

GLEACHER MEZZANINE FUND P,
L.P.

660 Madison Avenue, 17th Floor

New York, NY 
10021

Attn:   Mary
Gay, Managing Director

With a copy to:

Moore & Van Allen PLLC

100 North Tryon Street, Suite 4700

Charlotte, North Carolina 28202

Attn:   John
Chinuntdet

SUNTRUST BANKS, INC.

C/O SUNTRUST EQUITY PARTNERS

303 Peachtree Street, N.E., 25th Floor

Atlanta, GA 
30308

Attn:   Palmer
Henson, Director

With a copy to:

Moore & Van Allen PLLC

100 North Tryon Street, Suite 4700

Charlotte, North Carolina 28202

Attn:   John
Chinuntdet

 2
 

IF TO THE FOLLOWING EXECUTIVES, at the address
appearing in the Company’s records:

Debra Koenig

Timothy Kanaly

Daniel Gresham

Mark Hampton

Donald Prismon

VI Acquisition
Corp.

Stockholders Agreement

Schedule of Security Holders

 3

SCHEDULE
2

	
  

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
  

  	
   

  	
  JEFFRY L. GUIDO

  	
   

  

 

VI Acquisition
Corp.

Stockholders Agreement

Joinder Signature PageExhibit
10.1

Silicon
Laboratories Inc.

2007
Bonus Plan

Overview

Silicon Laboratories Inc. (“Silicon Labs”) is
committed to sharing its success with the people who make it possible — the
Silicon Labs employees.  The Compensation Committee of the Board of Directors
approved this 2007 Bonus Plan (the “Plan”) to encourage participation by
Silicon Labs employees in achieving company goals and to permit Silicon Labs
employees to share in the rewards of our success.  The term of this Plan
is for the 2007 fiscal year.

Eligible Employees

To be eligible to participate in the Plan, a
person must be a regular full-time or part-time employee of Silicon Labs or one
of its wholly-owned subsidiaries and not a participant in any other bonus plan
or cash incentive plan (including any sales commission plan) unless
participation under the Plan is permitted under the terms of such other plan.

Bonus Calculation

Our business strategy has always been for
Silicon Labs to be a growth company with strong profitability. 
Accordingly, bonuses under the Plan will be largely dependent on Silicon Labs’
adjusted operating income as a percentage of revenue, rounded to the nearest
tenth of a percent with 0.05% rounded up (the “Adjusted Operating Income %”). 
Adjustments will be made from time to time at the sole discretion of the
Compensation Committee to include or exclude certain items.  An example of
a potential adjustment would be the exclusion of an expense item such as stock
compensation.  Bonuses may also be made dependent on individual or company
performance criteria as established by the Compensation Committee (or its
designee).  In addition to adjusted operating income, such alternative
criteria may include, without limitation, revenue, revenue by product area(s),
gross margin, gross margin by product area(s) or management-based objectives
set by the Compensation Committee (or its designee) such as the introduction of
new products.

Unless an eligible employee receives written
notice from the CEO of Silicon Labs that different bonus criteria is applicable
to such employee, such employee’s bonus will be determined on a quarterly
basis as follows:

 

	
   

  	
   

  	
  Adjusted Operating Income

  %

  	
   

  	
  Bonus as a percent of

  Eligible

  Earnings for such Quarter

  	
   

  
	
  Maximum

  	
   

  	
  330

  	
  %

  	
  15

  	
  %

  
	
  Target

  	
   

  	
  25

  	
  %

  	
  12

  	
  %

  
	
   

  	
   

  	
  20

  	
  %

  	
  9

  	
  %

  
	
   

  	
   

  	
  15

  	
  %

  	
  6

  	
  %

  
	
  Minimum

  	
   

  	
  10

  	
  %

  	
  3

  	
  %

  
	
  No bonus

  	
   

  	
  <10

  	
  %

  	
  0

  	
  %

  

 

As illustrated by the chart above, the bonus
increases by 0.06% for every 0.1% increase in Adjusted Operating Income % over
the 10% minimum until reaching a maximum bonus payment of 15% at 30% 

Adjusted Operating Income.  The bonus
target is 12% at 25% Adjusted Operating Income.   The bonus shall be rounded to the nearest
tenth of a percent with 0.05% rounded up.

Eligible Earnings

Bonuses are paid as a percentage of Eligible
Earnings earned by such employee during such quarter.  Eligible Earnings
include only an employee’s base salary or hourly wages.  Eligible Earnings
do not include, among other things, disability pay, bonus payments from a
previous bonus period or other payments that are taxable but not considered
regular earnings.  For non-exempt employees, overtime pay would be
considered Eligible Earnings.

Timing of Payments

Bonus checks will generally be issued within
approximately one month after the end of each quarterly period.

General Provisions

· Bonuses are subject to all applicable
taxes and other required deductions.

· The Plan will not be available to
employees subject to the laws of any jurisdiction which prohibits any
provisions of this Plan or in which tax or other business considerations make
participation impracticable in the judgment of the Compensation Committee.

· The Plan
does not constitute a guarantee of employment nor does it restrict Silicon Labs’
rights to terminate employment at any time or for any lawful reason.

· The Plan
does not create vested rights of any nature nor does it constitute a contract
of employment or a contract of any other kind.  The Plan does not create
any customary concession or privilege to which there is any entitlement from
year-to-year, except to the extent required under applicable law.  Nothing
in the Plan entitles an employee to any remuneration or benefits not set forth
in the Plan nor does it restrict Silicon Labs’ rights to increase or decrease
the compensation of any employee, except as otherwise required under applicable
law.

· The Plan
shall not become a part of any employment condition, regular salary,
remuneration package, contract or agreement, but shall remain gratuitous in all
respects.  Bonuses are not to be taken into account for determining overtime
pay, severance pay, termination pay, or any other form of pay or compensation.

· The Plan is
provided at Silicon Labs’ sole discretion and Silicon Labs may modify or
eliminate it at any time, individually or in the aggregate, prospectively or
retroactively, without notice or obligation. In addition, there is no
obligation to extend or establish a similar plan in subsequent years.

· The Plan
shall not be pre-funded. Silicon Labs shall not be required to establish any
special or separate fund or to make any other segregation of assets to assure
the payment of bonuses.

· All
references to a quarterly period refer to fiscal quarters of Silicon Labs.

· This Plan
constitutes the entire arrangement regarding the Plan, supersedes any prior
oral or written description of the Plan and may not be modified except by a
written document that specifically references this Plan and is signed by the
Silicon Labs CEO.

· An employee
must be employed on the first day of the quarter in order to be eligible to
receive a bonus with respect to such quarter.

· Employees
who resign or are terminated prior to the actual payment of a bonus shall not
receive a bonus.

· Employees
who are separated from employment with Silicon Labs due to divestiture,
closure, or dissolution of a business are not eligible to receive a bonus.

· Independent
contractors, consultants, individuals who have entered into an independent
contractor or consultant agreement, temporary employees and contract employees
are not eligible to participate in the Plan.

· The bonus
for an otherwise eligible employee who has died prior to the end of a quarter
while actively employed will be paid to the decedent’s estate.

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