HP 8112A Operating, Programming And Servicing Manual page 226

10.4-2 Servicing the Shaper and Output Amplifier
!NP
INPUT
Fff'L I TUIE
AO.JUST
Figure 1 0.4-1. Shaper IC Block Diagram
Table 1 0.4-1. Shaper IC Output Modes
Inputs
WFl WF2
LO
LO
HI
HI
The main inputs are differential current inputs INP or INP . The
single-ended EECL voltage input (0 V to -0.6 V) generates an output
pulse with fast, but fixed, transition times.
Wave Forming
In Linear transition mode, the waveform block within the shaper IC
acts as a linear amplifier upon the input from the slope generator
(See Chapter 10.3).
In shaped ( Gaussian) mode, the linear slopes of the input pulses are
given gaussian characteristics controlled by the inputs on pins 1 and
24 of the shaper IC.
For fixed transitions, the single ended EECL input is used to provide
fast, fixed mode output pulses having a fixed transition of 4.5 ns.
CONTROL
SELECT
I
NORWCO.-F'L
NPUT N . C .
NORM/COl"PL
OF"f"SET
ADJUST
2 1
+SV -5 . 2. V
SELECT
Input
Selected
LO Differential
Differential
HI
LO Not used
HI EECL (0 V, -0.6 V) Fast Pulse
AP'F'LI TUOC
/ "
SYP+£TRY
VERNIER
ADJUST CONTROL VOL TAG£
ADJUST N . C .
POS t£G
RfoFl... . ITUOC
RD.JUST
Output
Signal
Linear
Shaped
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