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RF devices are used to receive and transmit radio signals from cell phones, Wi-fi networks, and other short range wireless systems such as Bluetooth. RF systems need amplifiers to pick up weak signals or transmit powerful ones, mixers, modulators, and demodulators to retrieve or encode signals, and power detectors to adjust system gain. DSP baseband processors extract coded signals and encode signals for insertion into a wireless network. Direct conversion radios do much of the work on a single chip.
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| Application Notes |
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AN-952: ADG9xx Wideband CMOS Switches: Frequently Asked Questions
(pdf, 166,643 bytes)
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AN-939: Super-Nyquist Operation of the AD9912 Yields a High RF Output Signal
(pdf, 226,651 bytes)
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AN-935: Designing an ADC Transformer-Coupled Front End
(pdf, 372,159 bytes)
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AN-927: Determining if a Spur is Related to the DDS/DAC or to Some Other Source (For Example, Switching Supplies)
(pdf, 174,271 bytes)
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AN-873: Lock Detect on the ADF4xxx Family of PLL Synthesizers
(pdf, 212,404 bytes)
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AN-860: Using an External VCO with the ADF7010
(pdf, 164,847 bytes)
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AN-859: RF Port Impedance Data, Matching, and External Component Selection for the ADF7020-1
(pdf, 985,013 bytes)
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AN-849: Using Op Amps as Comparators
(pdf, 120,169 bytes)
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AN-837: DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance
(pdf, 320,520 bytes)
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AN-835: Understanding High Speed ADC Testing and Evaluation
(pdf, 1,358,339 bytes)
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AN-826: A 2.4 GHz WiMAX Direct Conversion Transmitter
(pdf, 427,904 bytes)
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AN-691: Operation of RF Detector Products at Low Frequency
(pdf, 797,677 bytes)
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AN-588: AD7416/AD7417/AD7418 Power-On Reset Circuit
(pdf, 30,326 bytes)
If a large number of decoupling capacitors are used on the VDD line, re-applying power before VDD has discharged to 0 V can cause
the AD7416/AD7417/AD7418 to reset into an unknown.
state.
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AN-584: Using the AD813X Differential Amplifier
(pdf, 178,358 bytes)
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.
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AN-561: AD7416 Connects to the PIC16F84 via Emulated I²C™ Interface
(pdf, 75,851 bytes)
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AN-257: Careful Design Tames High Speed Op Amps
(pdf, 626,042 bytes)
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AN-30: Ask the Applications Engineer - PLL Synthesizers
(pdf, 189,276 bytes)
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| Technical Articles |
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Single-Sideband Upconversion of Quadrature DDS Signals to the 800-to-2500MHz
(pdf, 335,897 bytes)
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DDS IC Plus Frequency-To-Voltage Converter Make Low-Cost DAC
by Noel McNamara, Analog Devices, Inc. (EDN Design Idea, 2/5/2004)
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Two DDS ICs Implement Amplitude-shift Keying
by Noel McNamara, Analog Devices, Inc. (EDN Design Idea, 12/25/2003)
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DDS and Converter Form Signal Generator
by Colm Slattery (EDN Design Idea, 2/20/03)
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Techniques Simplify Wireless Transmission
... Approaches That Were Once Thought
Too Costly To Implement Now Have New Life, Thanks To The Availability Of Integrated Devices. (Wireless Systems Design, January/February 2003)
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Make a Truly Linear RF-Power Detector
(EDN, Design Ideas, 9/19/2002)
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Simplifying Direct-Conversion Tx Paths in Wireless Designs
(CommsDesign, 11/6/2002)
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Direct Digital Synthesis Enables Digital PLLs
by Paul Kern, Analog Devices, Inc.
(RF Design, 7/1/2007)
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Log Amps and Directional Couplers Enable VSWR Detection
by Anil Rachakonda and Larry Hawkins, Analog Devices, Inc. (RF Design, 1/1/2007)
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ADI Buys Korean Mobile TV Chip Maker
(EE Times, 6/7/2006)
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Measuring VSWR and Gain in Wireless Systems
By Eamon Nash, Analog Devices Inc., (Microwave Journal, Nov 2005)
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Measuring the RF Power in CDMA2000 and W-CDMA High Power Amplifiers (HPAs)
By Larry Hawkins, Analog Devices, Inc. (MPD Digest, Nov. 2005)
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Phase Locked Loops for High-Frequency Receivers and Transmitters – Part 1
(pdf, 70,086 bytes)
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Phase Locked Loops for High-Frequency Receivers and Transmitters – Part 3
(pdf, 78,145 bytes)
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Phase-Locked Loops for High-Frequency Receivers and Transmitters - Part 2
(pdf, 110,000 bytes)
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Optimizing Receiver Performance Through Error Vector Analysis
by Eric Newman, Analog Devices Inc. (Microwave Product Digest, October 2004)
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Will RF Detectors Measure Up To 3G?
by Rick Cory and Eamon Nash
(Wireless Systems Design, July/August 2004)
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Voltage Level Setting Requirements in RF Power Control Circuits
by James Caffrey, Analog Devices, Inc. (ECN, 6/1/2004)
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Assessing Multicarrier Direct-Conversion Transmitters
By Eamon Nash, Analog Devices,Inc. (Microwaves and RF, Feb 2004)
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Integrated DDS Chip Takes Steps To 2.7 GHz
This highly integrated 2.7-GHz source includes all essential DDS circuitry along with a clock driver, divider, high-resolution DAC, and combination phase detector/charge pump. (ED Online, April 2004)
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DDS Device Produces Sawtooth Waveform
Ramp or sawtooth waveforms are useful for a broad range of applications, including automatic-test equipment, benchtest equipment, and actuator control. (EDN Design Idea, 7/10/2003)
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Digital Potentiometers Vary Amplitude In DDS Devices
(Electronic Design, Ideas for Design, 5/29/2000)
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Single Chip Realizes Direct-Conversion Rx
(pdf, 2,578,766 bytes)
... Direct-conversion Rxs offer advantages
in simplicity compared to conventional
superheterodyne approaches, although
attention must be paid to some of the
trade-offs.
(Microwaves & RF, October 2002)
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Design a Logamp RF Pulse Detector
(pdf, 347,021 bytes)
by Eamon Nash
(Microwaves & RF, January 1, 2000)
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DDS Device Provides Amplitude Modulation
by Mary McCarthy, Analog Devices, Inc.
(EDN, September 2, 1999)
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