Featured · August 28, 2026
Frequency Converters: Specifying the Whole Module
A converter is a mixer plus everything that makes the mixer usable. What the preselector, the LO and the IF stage each set, and how to specify them together.
Evidence-led publishing
RF & Microwave Component Engineering Guides
Independent technical resources covering YIG oscillators, microwave filters, frequency synthesizers, converters and high-frequency signal-chain design.
Explore by section
Sections
4 guides
Microwave and RF Components
Component-family guides covering YIG oscillators and filters, microwave synthesizers, DROs, frequency converters, mixers and multipliers.
4 guides
YIG Technology
How yttrium iron garnet resonators, tuning coils and drivers work, and how YIG oscillators and filters compare with VCO, DRO and cavity alternatives.
1 guide
RF Engineering Guides
Reference guides to the parameters that decide a design, including phase noise, spurious content, insertion loss, VSWR, stability and settling time.
2 guides
RF Signal Chain
System-level guides to RF, IF and LO planning, up and downconversion, mixer conversion loss, image rejection and preselection.
1 guide
Microwave Applications
How component choices change across radar, electronic warfare, SATCOM, spectrum monitoring, test equipment and microwave communications.
1 guide
Component Sourcing and Quality
Practical guidance on obsolete RF parts, distributor evaluation, datasheet interpretation, traceability, incoming inspection and counterfeit avoidance.
In progress
Resources
Reference material for RF and microwave work, including a terminology glossary and an index of relevant standards and test methods.
How the parts connect
The RF signal chain
Each stage below leads to the guides covering that part of the chain.
Core technology
YIG Technology
yig technology
How YIG Oscillators Work
A YIG-tuned oscillator is a negative-resistance active device locked to a magnetically tuned resonator, with a coil driver doing most of the work you actually specify.
yig technology
What Is YIG, and Why Microwave Designs Use It
Yttrium iron garnet resonates at a frequency set by an applied magnetic field, which is what makes octave-wide tunable oscillators and filters possible.
yig technology
YIG Filter vs Cavity Filter
Use a YIG-tuned filter when the passband must move and stay a roughly constant absolute width. Use a cavity when the band is fixed and insertion loss or power handling binds.
yig technology
YIG Oscillator vs VCO vs DRO
When a YIG-tuned oscillator, a varactor VCO or a DRO is the right microwave source — decided by tuning range, hop speed and close-in phase noise, not by a headline dBc/Hz figure.
Parameters and testing
RF Engineering Guides
engineering
Understanding Phase Noise
What L(f) actually measures, why the offset frequency matters more than the headline number, and how phase noise relates to jitter.
Where it is used
Microwave Applications
applications
Radar RF Component Selection
How a radar waveform decides the LO, the preselector and the converter — wideband and hopping plans lean YIG; fixed-channel plans lean DRO and cavity.
Buying and verifying
Component Sourcing and Quality
sourcing quality
Sourcing Obsolete RF and Microwave Components
Why RF parts go obsolete early, how the authorized and open-market channels differ, and what traceability, inspection and testing to require before fitting one.
Recently published
Latest guides
components
Microwave Frequency Synthesizers: Architecture and Selection
How a phase-locked microwave synthesizer trades resolution against lock time and spurious content, and where a YIG oscillator earns its place as the loop VCO.
signal chain
RF, IF and LO Explained
The three frequencies in a heterodyne receiver, why the image sits 2 × IF from the wanted signal, and how that plan decides the preselector and the local oscillator.
signal chain
Upconverter vs Downconverter
Downconverters translate RF to a lower IF; upconverters translate IF to RF. Same mixing identity, opposite direction — the unused product is a frequency-plan problem in both.
components
YIG-Tuned Filters: Selection and Specification
What stage count, coupling and coil current actually set on a YIG filter, and when a cavity or a switched bank is the better preselector.
components
YIG Oscillators: Selection and Specification
What each YIG-tuned oscillator specification actually constrains, how the driver changes the answer, and when a VCO or DRO is the better choice.
Editorial disclosure
How this publication works
MicroSource Insights is an independent technical publication. It is not affiliated with MicroSource, Inc., Gresham Worldwide, or any manufacturer referenced on this website.