Analog Signal Processing
Analog signal processors have long been used to provide simple signal manipulation that could be very complicated to handle any other way. Comparators are used to provide level triggers accurate down to microvolts with response times in the picoseconds. Analog filters provide anti-aliasing in sampled data systems as inputs to ADCs and outputs from DACs, and are used as pre-filters in audio and communications systems. Analog multipliers and dividers are used to provide simple gain control, ratiometric functions, or continuous power measurement, with accuracy on the order of 1%. Over-voltage protection applications are used to protect the front-end of analog transmission/receiver
systems, multiplexers, and power supplies that have multiple outputs.
Application Notes
- AN-952 : ADG9xx Wideband CMOS Switches: Frequently Asked Questions
- AN-935 : Designing an ADC Transformer-Coupled Front End
- AN-931 : Understanding PulSAR ADC Support Circuitry
This application note discusses in general the pitfalls that occur regularly when using SAR ADCs and, more importantly, how to easily prevent them. - AN-927 : Determining if a Spur is Related to the DDS/DAC or to Some Other Source (For Example, Switching Supplies)
- AN-925 : Sensors for the AD7147 and AD7148 CapTouch Controllers
- AN-923 : Designing a System Using the ADAU1701/ADAU1702 in Self-Boot Mode
- AN-920 : Gain, LO, and Phase Compensation in a Single Sideband Transmitter Using the AD9788 TxDAC and ADL5372 Quadrature Modulator
- AN-892 : Temperature Measurement Theory and Practical Techniques
- AN-880 : 0: ADC Requirements for Temperature Measurement Systems
- AN-873 : Lock Detect on the ADF4xxx Family of PLL Synthesizers
- AN-849 : Using Op Amps as Comparators
- AN-793 : ESD/Latch-Up Considerations with iCoupler® Isolation Products
- AN-756 : Sampled Systems and the Effects of Clock Phase Noise and Jitter
- AN-742 : Frequency Domain Response of Switched-Capacitor ADCs
- AN-741 : Little Known Characteristics of Phase Noise
- AN-729 : Evaluation Kit for the AD5254 Quad 256-Position I2C-Compatible Nonvolatile Memory Digital Potentiometer
- AN-713 : The Effect of Long-Term Drift on Voltage References
- AN-649 : Using the Analog Devices Active Filter Design Tool
- AN-584 : Using the AD813X Differential Amplifier
The AD813x differs from conventional op amps by the external presence of an additional input and output. The additional input, VOGM, controls the output common mode voltage. - AN-501 : Aperture Uncertainty and ADC System Performance
A Key Concern in IF Sampling is that of Aperture Uncertainty (Jitter) - AN-417 : Fast Rail-to-Rail Operational Amplifiers Ease Design Constraints in Low Voltage High Speed Systems
Movement towards lower power supply voltages is driven by the demand that systems consume less and less power coupled with the desire to reduce the number of power supply voltages in the system. The following applications are discussed: Single-Ended and Differential Input ADC Input Circuits, Video Line Driver, Active Filter, HDSL Transceiver, and Transformer Drive Circuits. - AN-411 : Acceleration to Frequency Circuits
- AN-410 : 0: Overcoming Converter Nonlinearities with Dither
- AN-402 : 02: Replacing Output Clamping Op Amps with Input Clamping Amps
So far most clamping amplifiers have relied upon an output clamping architecture and are called output clamp amps (OCAs). A new architecture called an input clamp amp (ICA) offers superior clamping accuracy and lower distortion. - AN-359 : Settling Time of Operational Amplifiers
- AN-358 : Noise and Operational Amplifier Circuits
- AN-357 : Operational Integrators
- AN-356 : User's Guide to Applying and Measuring Operational Amplifier Specifications
- AN-348 : Avoiding Passive-Component Pitfalls
The Wrong Passive Component Can Derail Even the Best Op Amp or Data Converter. Here Are Some Basic Traps to Watch For. - AN-3 : AB-3: Digital Nulling of Precision Op Amps
- AN-257 : Careful Design Tames High Speed Op Amps
- AN-256 : Accurately Testing Op Amp Settling Times
- AN-253 : Find Op Amp Noise with Spreadsheet
- AN-25 : Applying the OP06 Op Amp As a High Precision Comparator
- AN-138 : SPICE-Compatible Op Amp Macro-Models
- AN-117 : OP-42 Advanced SPICE Macro-Model
- AN-113 : AB-113: Precision Ramp Generator
- AN-112 : AB-112: Single Resistor Controls Wien Bridge Oscillator Frequency
Frequency control can be added to the conventional Wien Bridge Circuit by adding an op amp inverter. - AN-111 : AB-111: Single-Supply Wien Bridge Oscillator
Wien Bridge Oscillators require only one op amp, important in battery-operation. This circuit operates from a single 9V battery. - AN-109 : AB-109: High Speed Precision Rectifier
The low offsets and excellent load driving capability of the OP-27 are key advantages in this precision rectifier circuit. - AN-106 : 06: A Collection of Amp Applications
Examines Some of the Numerous and Widely Used Applications of the Operational Amplifier
Evaluation Boards/Tools
- AD1852 Evaluation Board
- ADCMP572/573/580/581/582 Evaluation Tools
This document should be used in conjunction with the ADCMP57x/ADCMP58x data sheets that contain full technical details on the device specifications and operation. - ADCMP565 Evaluation Tools
- ADCMP551/ADCMP552/ADCMP561/ADCMP562/ADCMP563/ADCMP564 Evaluation Tools
Technical Articles
- Auto-Zero Amplifiers
A wide variety of electronic applications, especially those involving very small input signals, require signal paths with very low offset voltage and offset voltage drift over time and temperature. - Simple circuit provides precision ADC interface
(EDN, 08/21/03) - Circuit Measures True-rms and Average Value
(EDN, Design Ideas, 9/26/2002) - Circuit Provides ISFET-Sensor Bias
by Brian Harrington, Analog Devices, Inc. (EDN Design Idea, 6/10/2004) - Analog Devices AD7725 16-Bit Delta-Sigma ADC
... Analog Devices' New 16-Bit Sigma Delta ADC Features On-Chip Programmable Post Processor -- Post processor runs 130 million multiply-accumulate operations per second to free up external processing requirements. (ChipCenter Product Review, Product of the Week) - Make a Truly Linear RF-Power Detector
(EDN, Design Ideas, 9/19/2002) - Demystifying Auto-Zero Amplifiers Part 2
by Eric Nolan and Reza Moghimi (Analog Dialogue, May 2000) - Single IC provides gains of 10 and –10
by Moshe Gerstenhaber and Charles Kitchin, Analog Devices, Inc. (EDN, 8/7/2003) - Protecting Instrumentation Amplifiers
... All data acquisition board designs have to contend with ESD, EMI, and overvoltages. Can one solution protect the circuitry against all three hazards?
(First published in the April 2000 issue of Sensors Magazine) - DDS Circuit Generates Precise PWM Waveforms
by Colm Slattery, Analog Devices, Inc. (EDN, 10/2/2003) - High-Voltage Monitor Features High Accuracy
... Article is on page 3 of PDF.
(Electronic Design, Ideas for Design, 8/19/2002) - Isolation in Medical Applications
by Rich Ghiorse and Steve Ranta, Analog Devices, Inc. (Power Electronics-Europe, 7/2005)