Agilent Technologies 856290216 service manual Simplified Synthesizer Section

The HSCAN signal uses Q2 to reset the ramp. Q2 shorts the integrator and sets its output nominally to ground.

--------m---

A l 4 F R E Q U E N C Y

1

,CONTROL

A S S E M B L Y

A l l

I

YTO

-----

1

J 5

1 4 . 5

T O 1 8 . 5 dE!m

A7 SWITCHED LO

__) 1ST LO OUT

IDIST A M P L I F I E R

TO FRONT PANEL

I

J2 13 TO 16 dBn

I

----+ LOW BAND MIXER OUT

-1; - -

TO A8

J3 13 TO 16 d&n

I

I

----+ HIGH BAND MIXER OUT

F R A C N +

TO A10

L-

PLL

J 4

- 9

T O

- 2

d&n

-

- - -

-

- -

-

- -

-

-

-

I m-----I

3

T O

6 . 8

GHz

;

J301

SAMPLER OUT

I

J304

TO A15

FRAC N TEST

AAPPROX

- 10

dh

6 0 0 MHz

60 TO 96

MHz

APPROX 0 dh

w34

BLACK

T O A l 3

W32

SECOND

(:RAY/VIOLET

CONVERTER

SAMPLER IF

JlO

-1 0 T O +5 d&n /

60 TO 96 MHz

WHEN LOCKED, SAME

AS FRACTIONAL N FREO

10MHz

APPROX OdaTl

4 J30

w37

GRAY/GREEN

sll21e

4J305

w49

$?I O;!q

I( D E L E T E D

OPT’y03) I

I

I

I

0

I 1 ---v--J

Figure 1 l- 10. Simplified Synthesizer Section

Synthesizer Section 11-47