RF
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.
Application Notes
- AN-0996 : The Advantages of Using a Quadrature Digital Upconverter (QDUC) in Point-to-Point Microwave Transmit Systems
(pdf, 219 kB)
- AN-0987 : Designing a Wireless Transceiver System to Meet the Wireless M-Bus Standard
(pdf, 140 kB)
- AN-952 : ADG9xx Wideband CMOS Switches: Frequently Asked Questions
(pdf, 162 kB)
- AN-939 : Super-Nyquist Operation of the AD9912 Yields a High RF Output Signal
(pdf, 221 kB)
- AN-935 : Designing an ADC Transformer-Coupled Front End
(pdf, 363 kB)
- AN-927 : Determining if a Spur is Related to the DDS/DAC or to Some Other Source (For Example, Switching Supplies)
(pdf, 170 kB)
- AN-873 : Lock Detect on the ADF4xxx Family of PLL Synthesizers
(pdf, 207 kB)
- AN-860 : 0: Using an External VCO with the ADF7010
(pdf, 160 kB)
- AN-859 : RF Port Impedance Data, Matching, and External Component Selection for the ADF7020-1
(pdf, 333 kB)
- AN-849 : Using Op Amps as Comparators
(pdf, 117 kB)
- AN-837 : DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance
(pdf, 313 kB)
- AN-835 : Understanding High Speed ADC Testing and Evaluation
(pdf, 1326 kB)
- AN-826 : A 2.4 GHz WiMAX Direct Conversion Transmitter
(pdf, 417 kB)
- AN-691 : Operation of RF Detector Products at Low Frequency
(pdf, 778 kB)
- AN-588 : AD7416/AD7417/AD7418 Power-On Reset Circuit
(pdf, 29 kB)
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. - AN-584 : Using the AD813X Differential Amplifier
(pdf, 174 kB)
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-561 : AD7416 Connects to the PIC16F84 via Emulated I²C™ Interface
(pdf, 74 kB)
- AN-257 : Careful Design Tames High Speed Op Amps
(pdf, 611 kB)
- AN-30 : Ask the Applications Engineer - PLL Synthesizers
(pdf, 184 kB)
Ask the Experts
- Analog Devices, Inc. Application Engineering Department
For technical support and additional information, please contact our experienced applications engineers who are readily available to assist you.
Thank you.
Evaluation Boards/Tools
- AD6620 Filter Design Software and Evaluation Board
- AD6623 (AD6622) Analog-to-Digital: Stand Alone Board Evaluation Tools (AD6623S/PCB)
- AD6624/AD6624A Evaluation Board and Software
- AD6634 Evaluation Board and Software
- AD6635 Evaluation Board and Software
- AD6636 Evaluation Board and Software
- AD9860/AD9862 Evaluation Tool
- AD9864 and AD9874 Evaluation Kit
- AD9877: Broadband Modem MxFE™
- ADL5541 S-Parameters
(zip, 43 kB)
- EVAL-ADG936EB/EVAL-ADG936REB: Evaluation Board for Wideband CMOS Dual SPDT
(pdf, 117 kB)
- Evaluation Board for the AD9856
- SoftCell Filter Design Software
Product Reviews
- Quadrature Modulator ICs Span 250-MHz to 4-GHz
(eeProduct Center, 5/8/06)
Technical Articles
- ADI Buys Korean Mobile TV Chip Maker
(EE Times, 6/7/2006) - Assessing Multicarrier Direct-Conversion Transmitters
By Eamon Nash, Analog Devices,Inc. (Microwaves and RF, Feb 2004) - 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) - DDS Device Provides Amplitude Modulation
by Mary McCarthy, Analog Devices, Inc.
(EDN, September 2, 1999) - DDS IC Plus Frequency-To-Voltage Converter Make Low-Cost DAC
by Noel McNamara, Analog Devices, Inc. (EDN Design Idea, 2/5/2004) - Design a Logamp RF Pulse Detector
(pdf, 338 kB)
by Eamon Nash
(Microwaves & RF, January 1, 2000) - Digital Potentiometers Vary Amplitude In DDS Devices
(Electronic Design, Ideas for Design, 5/29/2000) - Fan Speed Control in PCs and Servers
(pdf, 114 kB)
by David Hanrahan
(Analog Dialogue, Vol. 34, No. 4) - 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) - Log Amps and Directional Couplers Enable VSWR Detection
by Anil Rachakonda and Larry Hawkins, Analog Devices, Inc. (RF Design, 1/1/2007) - Measuring the RF Power in CDMA2000 and W-CDMA High Power Amplifiers (HPAs)
By Larry Hawkins, Analog Devices, Inc. (MPD Digest, Nov. 2005) - Measuring VSWR and Gain in Wireless Systems
By Eamon Nash, Analog Devices Inc., (Microwave Journal, Nov 2005) - Optimizing Receiver Performance Through Error Vector Analysis
by Eric Newman, Analog Devices Inc. (Microwave Product Digest, October 2004) - Phase Locked Loops for High-Frequency Receivers and Transmitters – Part 1
(pdf, 68 kB)
- Phase Locked Loops for High-Frequency Receivers and Transmitters – Part 3
(pdf, 76 kB)
- Phase-Locked Loops for High-Frequency Receivers and Transmitters - Part 2
(pdf, 107 kB)
- Simplifying Direct-Conversion Tx Paths in Wireless Designs
(CommsDesign, 11/6/2002) - Single Chip Realizes Direct-Conversion Rx
(pdf, 2518 kB)
... 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) - Single-Sideband Upconversion of Quadrature DDS Signals to the 800-to-2500MHz
(pdf, 328 kB)
- 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) - Two DDS ICs Implement Amplitude-shift Keying
by Noel McNamara, Analog Devices, Inc. (EDN Design Idea, 12/25/2003) - Voltage Level Setting Requirements in RF Power Control Circuits
by James Caffrey, Analog Devices, Inc. (ECN, 6/1/2004)