Document:

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                                                                    EXHIBIT 10.9

                                        October 11, 2000

William Numann

RE:      EMPLOYMENT TERMS

Dear William,

Volterra is pleased to offer you the position of Vice President of Marketing on
the following terms.

You will report to Jeffrey Staszak. You will work at our facility located at
3839 Spinnaker Court in Fremont, California. Of course, Volterra may change your
position, duties, and work location from time to time as it deems necessary.

Your compensation will be $6,346.15 bi-weekly ($165,000 per year), less payroll
deductions and all required withholdings. You will be eligible for the following
standard Company benefits: medical, dental, life, and vision, 401(k), vacation
and sick leave, and holidays. You will receive options on 155,000 shares of
common stock pursuant to the Company's stock option plan. Your benefits and
options will begin to accrue on the 1st day of the first month following your
start date. Details about these benefit plans are available for your review.
Volterra may modify your compensation and benefits from time to time as it deems
necessary.

As a Volterra employee, you will be expected to abide by Company rules and
regulations, and sign and comply with a Proprietary Information and Inventions
Agreement, which prohibits unauthorized use or disclosure of Volterra
proprietary information.

Normal working hours are from 8:00 a.m. to 5:00 p.m., Monday through Friday. As
an exempt salaried employee, you will be expected to work additional hours as
required by the nature of your work assignments.

You may terminate your employment with Volterra at any time and for any reason
whatsoever simply by notifying Volterra. Likewise, Volterra may terminate your
employment at any time and for any reason whatsoever, with or without cause or
advance notice. This at-will employment relationship cannot be changed except in
writing signed by a Company officer.

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The employment terms in this letter supersede any other agreements or promises
made to you by anyone, whether oral or written. As required by law, this offer
is subject to satisfactory proof of your right to work in the United States.

Please sign and date this letter, and return it to me by October 31, 2000 if you
wish to accept employment at Volterra, under the terms described above. If you
accept our offer, we would like you to start on November 27, 2000.

We look forward to your favorable reply and to a productive and enjoyable work
relationship.

Sincerely,

/s/ Jeffrey Staszak

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Jeffrey Staszak
President/CEO

ACCEPTED:

/s/ William Numann

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William Numann

October 27, 2000

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[Date]<PAGE>

                                                                   EXHIBIT 10.10

                                       September 13, 2000

Daniel Wark

RE: EMPLOYMENT TERMS

Dear Dan,

Volterra is pleased to offer you the position of Vice President of Operations on
the following terms.

You will report to Jeff Staszak. You will work at our facility located at 3839
Spinnaker Ct, in Fremont, California. Of course, Volterra may change your
position, duties, and work location from time to time as it deems necessary.

Your compensation will be $5,846.15 bi-weekly ($152,000 per year), less payroll
deductions and all required withholdings. You will be eligible for the following
standard Company benefits: medical, dental, life, and vision insurance, 401(k),
Personal Time Off (PTO), and holidays. You will receive options on 150,000
shares of common stock pursuant to the Company's stock option plan. Your
benefits and options will begin to accrue on the 1st day of the first month
following your start date. Additional details about these benefit plans are
available for your review. Volterra may modify your compensation and benefits
from time to time as it deems necessary.

As a Volterra employee, you will be expected to abide by Company rules and
regulations, and sign and comply with a Proprietary Information and Inventions
Agreement, which prohibits unauthorized use or disclosure of Volterra
proprietary information.

Normal working hours are from 8:00 a.m. to 5:00 p.m., Monday through Friday. As
an exempt salaried employee, you will be expected to work additional hours as
required by the nature of your work assignments.

You may terminate your employment with Volterra at any time and for any reason
whatsoever simply by notifying Volterra. Likewise, Volterra may terminate your
employment at any time and for any reason whatsoever, with or without cause or
advance notice. This at-will employment relationship cannot be changed except in
writing signed by a Company officer.

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The employment terms in this letter supersede any other agreements or promises
made to you by anyone, whether oral or written. As required by law, this offer
is subject to satisfactory proof of your right to work in the United States.

Please sign and date this letter, and return it to me by September 20, if you
wish to accept employment at Volterra, under the terms described above. If you
accept our offer, we would like you to start October 2.

We look forward to your favorable reply and to a productive and enjoyable work
relationship.

Sincerely,

/s/ Jeff Staszak

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Jeff Staszak
President & CEO

ACCEPTED:

/s/ Dan Wark

---------------------------
Dan Wark

September 20, 2000

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Date<PAGE>

                                                                   EXHIBIT 10.11

Anthony Stratakos

RE:      EMPLOYMENT TERMS

Dear Mr. Stratakos:

Berkeley Integrated Technologies, Inc. is pleased to offer you the position of
Design Engineer, on the following terms.

You will be responsible for product and technology development. You will work at
our facility located at 2201 Broadway, Oakland, CA. Of course, Berkeley
Integrated Technologies, Inc. may change your position, duties, and work
location from time to time as it deems necessary.

Your compensation will be $6,000 per month, less payroll deductions and all
required withholdings. $3,600 per month of your compensation will be deferred
until September 27, 1997. You will be paid monthly and you will be eligible for
the following standard Company benefits as plans are established by the company:
medical insurance, vacation, sick leave, holidays. Details about these benefit
plans are available for your review. Berkeley Integrated Technologies, Inc. may
modify compensation and benefits from time to time as it deems necessary.

As a Berkeley Integrated Technologies, Inc. employee, you will be expected to
abide by Company rules and regulations, and sign and comply with a Proprietary
Information and Inventions Agreement which prohibits unauthorized use or
disclosure of Berkeley Integrated Technologies, Inc. proprietary information.

Normal working hours are from 9:00 a.m. to 5:00 p.m., Monday through Friday. As
an exempt salaried employee, you will be expected to work additional hours as
required by the nature of your work assignments.

You may terminate your employment with Berkeley Integrated Technologies, Inc. at
any time and for any reason whatsoever simply by notifying Berkeley Integrated
Technologies, Inc. Likewise, Berkeley Integrated Technologies, Inc. may
terminate your employment at any time and for any reason whatsoever, with or
without cause or advance notice. This at-will employment relationship cannot be
changed except in a writing signed by a Company officer.

If the Company terminates your employment without Cause, as defined below, the
vesting of your restricted stock, pursuant to the applicable Restricted Stock
Purchase Plan, which are unvested as of the termination date (the "Restricted
Stock") shall accelerate, and one-half of the stock shall be fully vested on the
termination date. For purposes of this letter, Cause shall mean misconduct,
including: (i) conviction of any felony or any crime involving moral turpitude
or dishonesty; (ii) participation in a fraud or act of dishonesty against the
Company; (iii) breach of the Company's policies; (iv) damage to the Company's
property; (v) breach of your Proprietary Information and Inventions Agreement;
or (vi) conduct which in the good faith and reasonable

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determination of the Company demonstrates unacceptable job performance or gross
unfitness to serve. Physical or mental disability shall not constitute Cause.

The employment terms in this letter supersede any other agreements or promises
made to you by anyone, whether oral or written. As required by law, this offer
is subject to satisfactory proof of your right to work in the United States.

Please sign and date this letter, and return it to me if you wish to accept
employment at Berkeley Integrated Technologies, Inc. under the terms described
above.

We look forward to your favorable reply and to a productive and enjoyable work
relationship.

Sincerely,

/s/ Greg Hildebrand

--------------------------
Greg Hildebrand

ACCEPTED:

/s/ Anthony Stratakos

--------------------------
Anthony Stratakos

September 27, 1996

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Date

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                                                                   EXHIBIT 10.12

                                       September 27, 1996

Craig Teuscher

RE:      EMPLOYMENT TERMS

Dear Mr. Teuscher:

Berkeley Integrated Technologies, Inc. is pleased to offer you the position of
Systems Engineer, on the following terms.

You will be responsible for systems integration and technical marketing. You
will work at our facility located at 2201 Broadway, Oakland, CA. Of course,
Berkeley Integrated Technologies, Inc. may change your position, duties, and
work location from time to time as it deems necessary.

Your compensation will be $3,000 per month, less payroll deductions and all
required withholdings. $1,800 per month of your compensation will be deferred
until September 27, 1997. You will be paid monthly and you will be eligible for
the following standard Company benefits as plans are established by the company:
medical insurance, vacation, sick leave, holidays. Details about these benefit
plans are available for your review. Berkeley Integrated Technologies, Inc. may
modify compensation and benefits from time to time as it deems necessary.

As a Berkeley Integrated Technologies, Inc. employee, you will be expected to
abide by Company rules and regulations, and sign and comply with a Proprietary
Information and Inventions Agreement which prohibits unauthorized use or
disclosure of Berkeley Integrated Technologies, Inc. proprietary information.

Normal working hours are from 9:00 a.m. to 5:00 p.m., Monday through Friday. You
will be scheduled to work two-and-a-half days per week. However, as an exempt
salaried employee, you will be expected to work additional hours as required by
the nature of your work assignments.

You may terminate your employment with Berkeley Integrated Technologies, Inc. at
any time and for any reason whatsoever simply by notifying Berkeley Integrated
Technologies, Inc. Likewise, Berkeley Integrated Technologies, Inc. may
terminate your employment at any time and for any reason whatsoever, with or
without cause or advance notice. This at-will employment relationship cannot be
changed except in a writing signed by a Company officer.

The employment terms in this letter supersede any other agreements or promises
made to you by anyone, whether oral or written. As required by law, this offer
is subject to satisfactory proof of your right to work in the United States.

Please sign and date this letter, and return it to me if you wish to accept
employment at Berkeley Integrated Technologies, Inc. under the terms described
above.

<PAGE>

We look forward to your favorable reply and to a productive and enjoyable work
relationship.

Sincerely,

/s/ Greg Hildebrand

--------------------------
Greg Hildebrand

ACCEPTED:

/s/ Craig Teuscher

--------------------------
Craig Teuscher

September 27, 1996

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Date

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