A16 Spam Board (Analog Description) - Keysight Technologies N5247B Service Manual

Theory of Operation
Receiver Group Operation
Table 5-10 PULSE I/O Connector Pin Assignments
DB-15 Female Connector
Pin Name
3 IFGateCin
4 IFGateDin
5 IFGateRin
6 DCOM
7 PulseSyncIn
8 RFPulseModIn
9 DCOM
10 Pulse1Out
11 Pulse2Out
12 Pulse3Out
13 Pulse4Out
14 NC
15 DCOM

A16 SPAM Board (Analog Description)

The A16 SPAM board contains digital and analog circuitry. For digital
descriptions, refer to
In this assembly, the IF signals (A, B, C, D, and R for 4-port models and A, B,
R1, and R2 for 2-port models) from the A24 IF multiplexer board go through a
gain stage where small signals are amplified to ensure that they can be
detected by the analog-to-digital converter (ADC).
All input signals are sampled simultaneously by the ADCs, where they are
converted to digital form. The ADC conversions are triggered by timing signals
from the digital signal processor (DSP) in response to commands from the
central processing unit (CPU). The digitized data is processed into magnitude
and phase data by the DSP and sent to the CPU random access memory (RAM)
by way of the peripheral component interconnect (PCI) bus.
Keysight N5247B Service Guide
Description
IF pulse gate input C (TTL)
IF pulse gate input D (TTL)
IF pulse gate input R (TTL)
Digital ground
Pulse generator synchronization trigger input (TTL)
RF source pulse modulation drive input (TTL)
Digital ground
Programmable pulse train output #1 (TTL)
Programmable pulse train output #2 (TTL)
Programmable pulse train output #3 (TTL)
Programmable pulse train output #4 (TTL)
No connect
Digital ground
"A16 SPAM Board (Digital Description)" on page 5-62.
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