IF Receiver Path Attenuation for Temperature-Stable RF Measurement
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Solution Overview
Problem
Existing measurement devices with receiver paths suffer from inaccuracies and inefficiencies due to temperature dependence, particularly in radio frequency measurements, as existing configurations fail to efficiently compensate for temperature changes.
Innovation Solution
A receiver path with a voltage variable attenuator in the intermediate frequency signal path that adjusts attenuation to compensate for ambient temperature fluctuations, eliminating the need for gain re-adjustment and digital recalculations, and incorporating a positive intrinsic negative diode to maintain consistent signal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common receiver path is used for radio frequency measurements, then device simplicity is maintained, but measurement accuracy deteriorates due to temperature changes
Solution Approach 1:
The patent applies parameter changes by implementing a voltage variable attenuator that dynamically adjusts the attenuation parameter in response to temperature changes. The attenuator's attenuation value is modified based on detected temperature variations, compensating for temperature-induced gain changes and maintaining measurement accuracy without requiring a complete redesign of the receiver path structure.
2Measurement precision
If temperature compensation is implemented using voltage variable attenuator, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent introduces a temperature detector as an intermediary component that senses temperature changes and provides control signals to the voltage variable attenuator. This intermediary mechanism enables automatic temperature compensation without requiring complex control systems or multiple additional components, as the temperature detector directly interfaces with the attenuator to adjust its attenuation value based on real-time temperature conditions.
3Measurement precision
If gain readjustment is performed during temperature fluctuations, then measurement accuracy is maintained, but measurement efficiency decreases due to restart requirements
Solution Approach 1:
The patent implements continuous temperature compensation by maintaining the voltage variable attenuator in an always-active state, continuously adjusting its attenuation value in response to temperature changes. This eliminates the need to interrupt measurements for gain readjustment or system restarts, as the compensation operates continuously and automatically throughout the measurement process, thereby maintaining both accuracy and efficiency.
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
Ensures high accuracy and efficiency by maintaining consistent signal levels and reducing inaccuracies and inefficiencies, allowing for continuous operation without digital scalers and improved signal-to-noise ratio.
Implementation Method 1
the voltage variable attenuator is adapted to change its attenuation to compensate ambient temperature changes
Implementation Method 2
a mixer for generating an intermediate frequency signal by mixing the radio frequency input signal with a local oscillator signal
Data Source
AI summary
A receiver path for a measurement device is provided. Said receiver path comprises a radio frequency input path for inputting a radio frequency input signal, a mixer for generating an intermediate frequency signal by mixing the radio frequency input signal with a local oscillator signal, and an intermediate frequency signal carrying path for carrying the intermediate frequency signal. In this context, the intermediate frequency signal carrying path comprises a voltage variable attenuator.