Multi-Domain Signal Capture for mmWave RF Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing oscilloscopes face limitations in analyzing mmWave RF signals due to frequency limitations, requiring high sampling rates and specialized mixers or downconverters, which are not practical for conventional instruments, and spectrum analyzers are inadequate for wideband analysis.
Innovation Solution
A measurement apparatus with time, frequency, and logic domain channels, utilizing a controller to coordinate operations among these domains, including a local oscillator for frequency downconversion and logic levels to trigger and control signal acquisition, enabling efficient analysis of mmWave RF signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct digitization is used for mmWave RF signals, then signal capture is possible, but very high sampling rates are required which are not practical for most inexpensive oscilloscopes
Solution Approach 1:
The patent introduces an intermediate frequency conversion stage using a mixer and local oscillator to convert mmWave RF signals to a lower intermediate frequency before digitization. This intermediary conversion enables practical sampling rates while maintaining signal capture capability, resolving the contradiction between measurement precision and device complexity.
2Adaptability or versatility
If analog downconversion is used for frequency domain analysis, then frequency translation is achieved, but wideband analog frequency translation stages are limited in input frequency to a few GHz
Solution Approach 1:
The patent changes the operating parameters of the mixer and local oscillator to enable frequency translation at mmWave frequencies. By adjusting these parameters, the system achieves wideband frequency analysis capability beyond the traditional few GHz limitation of analog downconversion stages.
3Adaptability or versatility
If digital down-conversion is used, then frequency domain processing is enabled, but the digitizer must process full bandwidth which requires higher sampling rates than instantaneous bandwidth
Solution Approach 1:
The patent uses an intermediary mixer stage to perform frequency translation before the signal reaches the digitizer. This allows the digitizer to process only the translated intermediate frequency signal at practical sampling rates, rather than requiring the full bandwidth capability for direct digital down-conversion of mmWave signals.
4Adaptability or versatility
If multiple domain channels are added to the oscilloscope, then analysis capability is improved, but device complexity increases
Solution Approach 1:
The patent implements a unified signal processing architecture where a single mixer and local oscillator serve multiple functions across different domain channels. This multi-functional approach enables time domain, frequency domain, and logic domain analysis capabilities while minimizing the increase in device complexity through shared components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables effective analysis of mmWave RF signals by minimizing bandwidth requirements and maintaining signal integrity through coordinated domain operations, overcoming frequency limitations of conventional instruments.
Implementation Method 1
The frequency domain channel includes analog frequency downconversion, with optional filtering of incoming signals prior to digitization
Data Source
AI summary
A measurement apparatus for measuring signals from a DUT includes a time domain receiver for receiving from the DUT a DUT time domain output signal in a time domain and providing a time domain input signal; a logic domain receiver for receiving from the DUT a DUT logic domain output signal including logic levels over time; an LO for generating an LO signal; a mixer for receiving from the DUT a DUT frequency domain output signal in a frequency domain and for mixing the DUT frequency domain output signal and the LO signal to provide a frequency downconverted frequency domain signal; a frequency domain receiver for receiving the frequency downconverted frequency domain signal and providing a frequency domain input signal; and a controller for determining control signals in response to the logic levels from the DUT logic domain output signal for controlling at least one operation of the LO.