See stability
Loop gain and phase margin in power supplies and control loops ultimately reduce to a Bode plot.
MEASUREMENT INSTRUMENTS
See frequency response
more clearly.
RadiLab is developing the FRA-100, a frequency response and impedance analyzer for components, circuits, and systems. Two-channel stepped-sine sweeps, FPGA processing, and Ethernet SCPI make frequency-domain measurement more direct.
2 CH two-channel
1 Hz–120 MHz target range
1 GbE SCPI
Engineering prototype
TRACE
-0.17 dB · 0.00°
Gain / Phase
SWEEP
201 pts
current default
Form factor and UI are illustrative; final product subject to change.
WHY FREQUENCY RESPONSE
Read the whole system from one sweep
Frequency response describes gain and phase versus frequency; impedance reveals how components and networks behave across frequency. Putting both into one measurement workflow makes selection, debugging, and validation more efficient.
See components
The impedance of capacitors, inductors, resonators, and sensors changes with frequency, revealing ESR/ESL and resonance.
See the signal chain
Magnitude, phase, and group delay of filters, amplifiers, and cables determine how a signal passes through the system.
CORE CAPABILITIES
Four foundations for frequency-domain measurement
FRA-100 starts with reliable two-channel measurement, then extends toward impedance, calibration, and VNA.
Two-channel ratiometric measurement
ADC1/ADC0 are sampled in sync. The ratio cancels common source and clock errors, keeping the result focused on the DUT.
Stepped-sine sweeps
Narrow-band detection at each point rejects out-of-band noise. Linear or logarithmic, start/stop or center/span, 201 points by default and up to 20,001.
FPGA real-time processing
Digital down-conversion and a single-bin DFT run inside the instrument; results return over 1 GbE.
Open control interface
TCP 5025 SCPI and a Windows host app; continuous sweeps, cursors, CSV/PNG export.
WORKFLOW
From connection to result in five steps
The current prototype covers connection, configuration, sweep, readout, and export. Calibration and fixture de-embedding are on the roadmap.
01
Connect
Connect over 1 GbE and set the instrument IP address.
02
Configure
Choose start/stop or center/span, linear or logarithmic spacing, point count, and receiver bandwidth.
03
Sweep
Run a single or continuous sweep and watch magnitude and phase traces update.
04
Read
Use the left and right cursors for frequency, magnitude, phase, and delta readouts.
05
Export
Save CSV data or a PNG image for further analysis.
Calibration / normalization (in development): Open/Short/Load/Thru and fixture de-embedding will arrive with the impedance release.
APPLICATIONS
From components to systems
Each scenario is marked as available now or available with the impedance release, so you can judge fit for the current stage.
Filter and amplifier response
Measure input-to-output transfer, -3 dB bandwidth, resonance, and phase shift.
Circuit transfer functions
Measure node-to-node magnitude and phase with probes or injection.
Power-supply loop stability
Measure loop gain and phase margin to assess stability; an injection transformer is required.
L/C/R, ESR and ESL
Four-terminal impedance measurements reveal equivalent series parameters and self-resonance.
Piezoelectric, ceramic and sensors
Impedance and resonance curves, Q factor, and resonant frequency.
Education and research
Frequency-response labs, data export, and further analysis.
DEVELOPMENT ROADMAP
One instrument, built in stages
We first make gain and phase measurement reliable, then add impedance, calibration, and VNA. Every stage is validated on real hardware.
Proof of concept
Stepped-sine source, two-channel ratio measurement, and the FPGA processing chain.
DoneEngineering prototype
Two-channel gain/phase sweeps, 1 GbE SCPI, host software, and data export.
Current stageImpedance and calibration
Four-terminal vector-cancellation balanced bridge (HC/HP/LC/LP), OSL/Thru, and fixture de-embedding.
In developmentVNA and wider bandwidth
Full two-port S-parameters, Smith/Nyquist, 1 Hz–120 MHz target.
PlannedABOUT RADILAB
From RF and electronics to measurement instruments that keep evolving
Wuxi Ruilei Electronic Technology Co., Ltd. was founded in 2019 in Wuxi, Jiangsu. We work on electronics and RF technologies and now focus on measurement instruments.
FRA-100 is our first product. We started with frequency-response measurement and built a platform that combines the analog front end, FPGA signal processing, host software, and calibration methods.
2019
Founded
Wuxi
Jiangsu, China
FRA-100
First product
Measured: 10 Hz–10 MHz, 2,000 points, 100 Hz RBW, 50 Ω.
Want to validate a measurement scenario with us?
We are looking for early partners and test scenarios. Talk to us about prototype evaluation, joint testing, and distribution.