S t a r t

S t o p

L a s e r

S c a n n i n g   M i r r o r

eram

Ca

Figure

Camera

Optics

with

Hole

in

Mirror

and

Coplanar

Camera

and

Laser

degrees

out

of

phase 

th

us

pro

viding

our

I

and

Q

references 

The

clo

c

k

signals

are

then

bu ered

b

y

using

the

un

used

X

OR

gates 

One

in phase I 

clo

c

k

signal

is

connected

to

a

di eren

tial

line

driv

er

to

driv

e

a

cable

to

the

laser 

One

in phase I 

and

one

quadrature Q 

signal

are

also

coupled

to

the

m

ultipliers

for

demo

dulation

b

y

t

w

o

toroidal

transformers 

a

v

oiding

a

direct

ground

connection

th

us

pro

viding

the

least

amoun

t

of

noise

and

clo

c

k

feed

through 

Demo

dulator

The

demo

dulator

is

the

k

ey

to

the

quadrature

phase

detection

circuitry

It

is

where

the

high

and

lo

w

frequency

sections

of

the

b

oard

meet 

A

photo

of

the

completed