Slope Generation; Fixed Transition; Linear And Gaussian Transitions - HP 8112A Operating, Programming And Servicing Manual

Slope Generation

Figure 10.3-3. Slope IC block diagram
Refer to Figure 10.3-5 and Figure 10.3-3. When triggered by the
output of the width generator, the Slope IC U301 operates in one of
two transition modes.

Fixed Transition

In fixed mode (fixed 4.5 ns transitions), an ECL trigger output is
used by the Shaper IC (See Chapter 10.4) to produce fixed transition
time output pulses.
With fixed mode selected, the input trigger signal on pin 1 is
passed via ECL circuitry to the EECL output, pin 21. See Figure
Figure 10.3-3. An error output is available at pin 23, this goes active
if a trigger input is detected whilst the IC output is still active.

Linear and Gaussian Transitions

In linear and gauss slope modes, a differential output (OUT, OUT)
is used to drive the Shaper IC (See Chapter 10.4) to produce output
pulses with variable transition times.
When linear or gaussian mode is selected, the slope generator relies
on four current sources and a switched range capacitor network
to produce variable transition time leading and trailing edges,
depending on the LEE and TRE DACs in the control section (See
Chapter 10.5). The slope ramp value is controlled internally, or
externally, according to the condition of pin 10 (EXT).
Servicing the Timing and 10.3-7
Slope Generators