Passive Temperature Compensation Circuit for Phased Array Gain Stability
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Solution Overview
Problem
Existing signal processing paths, especially in microwave frequency bands, experience significant gain fluctuations due to temperature changes, which are not effectively compensated by current module-level temperature compensation solutions, leading to instability.
Innovation Solution
A temperature compensation circuit comprising a temperature detection circuit, a temperature conversion circuit, and a passive variable attenuator is introduced, which generates a control signal to adjust the attenuation value in the signal processing path, reducing the impact of temperature changes on gain, and is suitable for time division duplex mobile communications systems to share resources and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If module-level temperature compensation solutions (positive correlation bias or load) are used, then some gain change compensation is achieved, but temperature compensation capability remains limited and gain stability is insufficient in microwave frequency bands
Solution Approach 1:
The patent employs a dynamic temperature compensation approach by using a variable attenuator whose attenuation amount is controlled by a control signal that varies with temperature. Unlike static module-level compensation, this solution dynamically adjusts the attenuation in real-time based on temperature changes, enabling the system to adapt to varying thermal conditions and maintain gain stability across different operating temperatures.
Solution Approach 2:
The invention changes the attenuation parameter of the variable attenuator in response to temperature variations. The control signal adjusts the attenuation amount according to the temperature, thereby compensating for gain changes caused by thermal effects. This parameter-based compensation mechanism provides more flexible and effective temperature compensation compared to fixed module-level solutions.
2Reliability
If active components are used for temperature compensation, then compensation functionality is achieved, but power consumption increases
Solution Approach 1:
The patent introduces a passive variable attenuator as an intermediary element in the temperature compensation path. This attenuator is controlled by a control signal that modulates its attenuation based on temperature, providing compensation functionality without requiring active power-consuming components. The intermediary attenuator bridges the temperature detection and gain control functions while maintaining low power consumption.
Solution Approach 2:
The invention uses a passive circuit implementation that avoids expensive and power-consuming active components. The variable attenuator can be implemented using passive elements such as resistors, capacitors, and inductors, which consume minimal power. This approach prioritizes energy efficiency while achieving the required temperature compensation performance.
3Ease of operation
If unidirectional active components are used, then signal processing in one direction is achieved, but time division duplex systems cannot share compensation circuits between transmitting and receiving paths
Solution Approach 1:
The patent designs a temperature compensation circuit with a passive variable attenuator that can function bidirectionally. The same attenuator and control mechanism can serve both the transmitting path and the receiving path in a time division duplex system. This universal design allows a single compensation circuit to handle multiple functions and signal directions, enabling resource sharing and reducing system complexity.
Solution Approach 2:
The invention overcomes the unidirectional limitation by inverting the approach: instead of using active components that inherently favor one signal direction, it employs a passive attenuator that can process signals in either direction. The control signal mechanism remains the same, but the passive nature of the attenuator allows it to work effectively whether the signal is flowing in the transmit or receive direction, enabling bidirectional functionality.
Data Source
AI summary
Example temperature compensation circuits and a phased array apparatus are described. One example temperature compensation circuit is applied to a signal processing path. The example temperature compensation circuit includes a temperature detection circuit, a temperature conversion circuit, and a passive variable attenuator. The passive variable attenuator is configured to be connected in series in the signal processing path. The temperature detection circuit is configured to generate a temperature signal and a reference signal, and output the temperature signal and the reference signal to the temperature conversion circuit. The temperature signal monotonically changes with a temperature of the signal processing path. The temperature conversion circuit is configured to generate a control signal based on the temperature signal and the reference signal. The passive variable attenuator is configured to adjust, under control of the control signal, an attenuation value of a signal processed by the signal processing path.