S t a r t

S t o p

C a m e r a

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

L a s e r

Figure

Camera

Optics 

with

Camera

V

ertically

Displaced

from

the

Laser

set

of

timing

signals

for

the

digital

b

oard 

This

planar

scanning

system

w

orks

w

ell

for

the

application

of

scanning

a

smart

surface 

but

could

b

e

redesigned

to

scan

other

geometries 

Quadrature

Clo

c

k

Generator

The

quadrature

clo

c

k

generator

is

used

to

generate

t

w

o

clo

c

k

signals 

degrees

out

of

phase 

The

initial

clo

c

k

signal

is

generated

b

y

a

MHz

crystal

oscillator 

The

signal

is

split

and

fed

in

to

t

w

o

  F  

X

OR

gates 

One

is

con gured

as

a

bu er

and

the

other

as

an

in

v

erter 

This

is

to

k

eep

the

propagation

dela

ys

the

same

for

b

oth

signals 

These

signals

are

wired

to

t

w

o

  F  

D

 ip  ops 

con gured

as

toggle

 ip  ops 

The

clo

c

k

signals

are

connected

to

the

clo

c

k

inputs 

The

D

output

is

connected

to

the

Q

input 

Since

one

of

the

clo

c

ks

is

in

v

erted 

one

 ip  op

is

triggered

on

the

rising

edge

while

one

is

triggered

on

the

falling

edge 

This

creates

t

w

o

  MHz

clo

c

k

signals