Signal Generation
The generation of precision clock signals, clock derivatives, and the distribution of these signals is a central part of modern communication systems. Direct digital synthesis (DDS) devices can generate precisely defined frequencies for frequency agile systems and modulation up to about 1GHz. Phase-lock loop devices (PLL) can generate fractional or super multiples of a reference clock with very low jitter at frequencies up to several GHz. Clock distribution devices are needed to transfer precision clocks accurately and with low jitter.
ADIsim Design & Simulation Tools
Application Notes
- AN-953 : Direct Digital Synthesis (DDS) with a Programmable Modulus
- AN-939 : Super-Nyquist Operation of the AD9912 Yields a High RF Output Signal
- AN-873 : Lock Detect on the ADF4xxx Family of PLL Synthesizers
- AN-849 : Using Op Amps as Comparators
- AN-847 : Measuring a Grounded Impedance Profile Using the AD5933
- AN-843 : Measuring a Loudspeaker Impedance Profile Using the AD5933 (Rev. A, 6/07)
- AN-826 : A 2.4 GHz WiMAX Direct Conversion Transmitter
- AN-759 : Expanding the Number of DAC Outputs on the ADuC8xx and ADuC702x Families (uC012)
- AN-759 Companion Code (zip, 3,464 bytes) (zip, 3 kB)
- AN-756 : Sampled Systems and the Effects of Clock Phase Noise and Jitter
- AN-741 : Little Known Characteristics of Phase Noise
- AN-715 : A First Approach to IBIS Models: What They Are and How They Are Generated
- AN-649 : Using the Analog Devices Active Filter Design Tool
- AN-621 : Programming the AD9832/AD9835
This application note details how to program 5 MHz on the output of the AD9832/AD9835 parts. The frequency register,defer register,and command sequence are explained in detail. - AN-600 : 00: Embedding Temperature Information in the ADXL202's PWM Outputs
- AN-585 : AD5232–Programmable Oscillator Using Digital Potentiometers
- AN-580 : 0: Programmable Oscillator Uses Digital Potentiometers
- AN-501 : Aperture Uncertainty and ADC System Performance
A Key Concern in IF Sampling is that of Aperture Uncertainty (Jitter) - 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-328 : Generate 4 Channels of Analog Output Using AD7542 12-Bit DAC and Control the Lot with Only 2 Wires
- AN-324 : Simple DAC-Based Circuit Implements Constant Linear Velocity Motor Speed Control
- AN-322 : Improve Function Generators with Matched D/A Converters
AD7528 Dual 8-Bit CMOS Multiplying DAC Makes Function Generation Practical and Affordable - AN-318 : AD7528 Dual 8-Bit CMOS Multiplying DAC
This Application Note details a myriad of circuit applications made possible by the multiplying characteristics and/or resistor ladder matching characteristics of the AD7528. - AN-30 : 0: Ask the Applications Engineer - PLL Synthesizers
- AN-3 : AB-3: Digital Nulling of Precision Op Amps
- AN-282 : Fundamentals of Sampled Data Systems
- AN-256 : Accurately Testing Op Amp Settling Times
- AN-253 : Find Op Amp Noise with Spreadsheet
- AN-138 : SPICE-Compatible Op Amp Macro-Models
- AN-137 : A Digitally Programmable Gain and Attenuation Amplifier Design
- 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
Design Calculators
Evaluation Boards/Tools
- ADIsimCLK™ Design and Evaluation Software
- AD9912 Evaluation Tools
- AD9912 Schematic, Rev. A (pdf, 399 kB)
- AD9912 Gerber Files, Rev. A (zip, 268 kB)
- AD9912 Evaluation Software, Rev. 1.02 (zip, 5878 kB)
- AD9912 Evaluation Board Data Sheet, Rev. 0 (pdf, 558 kB)
- AD9549 Evaluation Tools
- AD9549 Schematics, Rev. E (pdf, 505 kB)
- AD9549 Gerber Files, Rev. E (zip, 329 kB)
- AD9549 Evaluation Software, Rev. 1.02 (zip, 5878 kB)
Technical Articles
- Direct Digital Synthesis Enables Digital PLLs
by Paul Kern, Analog Devices, Inc.
(RF Design, 7/1/2007) - Circuit Measures True-rms and Average Value
(EDN, Design Ideas, 9/26/2002) - DDS Device Provides Amplitude Modulation
by Mary McCarthy, Analog Devices, Inc.
(EDN, September 2, 1999) - Precision Programmable Current Sources Use Digital Pots
by Peter Khairolomour, Gary Leung, Alan Li, Analog Devices, Inc. (Design Brief, EDN, 3/31/2005) - Demystifying Auto-Zero Amplifiers Part 2
by Eric Nolan and Reza Moghimi (Analog Dialogue, May 2000) - Design A Clock-Distribution Strategy With Confidence
by Demetrios Efstathiou (Electronic Design, April 27, 2006) - Improved DDS Devices Enable Advanced Comm Systems
by Valoree Young, Analog Devices
(Electronic Products, September 2006) - Digital Potentiometers Vary Amplitude In DDS Devices
(Electronic Design, Ideas for Design, 5/29/2000) - Single-Sideband Upconversion of Quadrature DDS Signals to the 800-to-2500MHz