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Integrating EM Simulation Technologies within an RFIC Design Flow

July 13, 2016
Electromagnetic (EM) simulation is an indispensable tool for characterizing the on-chip passive structures found in radio-frequency integrated circuit (RFIC) designs. However, when it comes to full-chip analysis, the diversity of structure geometries and scale pose a significant challenge for any single EM simulation technology. Successful characterization of an RFIC generally requires three different types of simulators: parasitic extraction, planar EM, and full (arbitrary) 3D solvers.
richardson

Pulsed GaN Power Transistors

April 17, 2013

This paper explains the pulsed RF operation of Microsemi pulsed GaN HEMT RF power transistors using as an example the 1011GN-700ELM 1030 MHz Mode-S Enhanced Message Length (ELM) avionics device. General descriptions are presented detailing both the pulsed gate bias operation and the bias sequencing operation of the pulser circuit used on the Microsemi evaluation test fixtures.

Understanding VCO Concepts

January 16, 2013
This application note looks at VCO fundamentals, for typical oscillator designs through tuning sensitivity characteristics. Examples of a Colpitts and Clapp circuit are presented.

High Voltage Inverting Charge Pump Produces Low Noise

December 15, 2012

Dual-polarity supplies are commonly needed to operate electronics such as op amps, drivers, or sensors, but there is rarely a dual-polarity supply available at the point of load. The LTC®3260 is an inverting charge pump (inductorless) DC/DC converter with dual low noise LDO regulators that can produce positive and negative supplies from a single wide input (4.5V to 32V) power source. It can switch between high efficiency Burst Mode® operation and low noise constant frequency mode, making it attractive for both portable and noise-sensitive applications.

Biasing Constant Current MMICs

December 7, 2012

The Mini-Circuits family of microwave monolithic integrated circuit (MMIC) Darlington amplifiers offers the RF designer multi-stage performance in packages that look like a discrete transistor.

Small-Signal Intermodulation Distortion in OFDM Transmission Systems

August 13, 2012
A system that utilizes OFDM/OFDMA, such as the E-UTRA (LTE) downlink or the IEEE 802.11a/g and the IEEE 802.16 physical layers, transmits OFDM symbols, each comprising a number of modulated sub-carriers carrying data or pilot symbols, with inter-subcarrier spacing being equal to or an integer multiple of a fixed frequency. The channel bandwidth (B) is determined by the number of 'occupied' (modulated) subcarriers and the subcarrier spacing.

Harmonic Mixer Primer: The Gateway to the Millimeter Wave Frontier is Harmonic Mixer Technology

July 17, 2012
The next frequency frontier is the millimeter wave (mm-wave) band, which occupies the 30 GHz to 300 GHz spectrum (wavelengths from 10 to 1 mm). Emerging applications now span radio astronomy, communication, imaging, space research, and homeland security, and are starting to seriously populate this vast spectrum resourse. Market forecast and limited available spectrum suggest that attractive growth is just over the horizon so explorers are naturally migrating to stake their claim in this next frontier.

Small-Signal Intermodulation Distortion in OFDM Transmission Systems

June 13, 2012
The small-signal nonlinear distortion of a system can be described with sufficient accuracy using a third order Volterra expansion of the output in terms of the input. This simple model assumes a memoryless, frequency independent amplifier system, whereby the amplifier characteristics remain constant over the operation bandwidth or, stated equivalently, the operation bandwidth is small compared with the available amplifier system bandwidth....

LO Harmonic Effects on TRF3705 Sideband Suppression

May 14, 2012
The LO harmonic effects on I/Q errors and sideband suppression (SBS) in the RF modulator was analyzed in application report SLWA059. This application report further investigated LO harmonic effects when attempting to achieve an increased level of SBS performance.

New Low-Profile Hermetic LTCC Mixer Series Raises the Bar for Reliability, Performance, and Price

March 14, 2012
A new family of ultra-reliable mixers, developed by Mini-Circuits, combines low-temperature cofired ceramic (LTCC) circuitry and specially selected semiconductor dice in a hermetically sealed case at 1/10th the price of comparable products on the market. Fully automated, tightly-controlled, and highly repeatable processes ensure excellent performance at temperatures up to 125 degrees C.