Hardware Overview; Differential Programmable Gain Input Amplifier; Differential Input - National Instruments NI PCI-5911 User Manual

Hardware Overview

Analog Input
Connector
Calibration
Generator
Digital I/O
Connector
Differential Programmable Gain Input Amplifier (PGIA)

Differential Input

© National Instruments Corporation
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.
AC/DC Coupling
Protect/
Calibration
Mux
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.
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
PGIA
Noise
Shaper
Digital Signal
Processor
Figure 2-1. NI 5911 Block Diagram
2-1
2
A/D Converter
100 MHz, 8-Bit
Timing I/O, Reference
Memory Control
Clock
Capture
Memory
Data
NI PCI-5911 User Manual