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National Instruments Corporation
2-1
2
Hardware Overview
This chapter includes an overview of the NI 5911, explains the operation of
each functional unit making up the NI 5911, and describes the signal
connections. Figure 2-1 shows a block diagram of the NI 5911.
Figure 2-1.
NI 5911 Block Diagram
Differential Programmable Gain Input Amplifier (PGIA)
The analog input of the NI 5911 is equipped with a differential
programmable gain input amplifier. The PGIA accurately interfaces to and
scales the signal presented to the ADC regardless of source impedance,
source amplitude, DC biasing, or common-mode noise voltages.
Differential Input
When measuring high dynamic range signals, ground noise is often a
problem. The PGIA of the NI 5911 allows you to make noise-free signal
measurements. The PGIA differential amplifier efficiently rejects any
noise present on the ground signal. Internal to the PGIA, the signal
Protect/
Calibration
Mux
Calibration
Generator
PGIA
Noise
Shaper
Reference
Clock
Data
A/D Converter
100 MHz, 8-Bit
Digital Signal
Processor
Digital I/O
Connector
Analog Input
Connector
AC/DC Coupling
Capture
Memory
Timing I/O,
Memory Control
