Closed-Loop Attenuator Circuit for Stable Phased Array Beam Steering
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Solution Overview
Problem
Phased array antennas' attenuators suffer from accuracy degradation due to shifting process parameters across manufacturing lots and temperature variations, leading to inaccuracies in beam formation and steering.
Innovation Solution
A closed-loop attenuator circuit with active circuit devices and a feedback mechanism that controls on-resistance based on voltage and resistance values, ensuring consistent attenuation across different lots and temperatures, thereby improving accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional attenuators are used in phased array antennas, then the device complexity is low, but the measurement precision degrades due to process parameter shifts and temperature variations
Solution Approach 1:
The patent implements a feedback mechanism where the on-resistance of active circuit devices is controlled based on voltage and resistance values sensed from the circuit. This closed-loop control compensates for process parameter shifts and temperature variations, maintaining accurate attenuation despite environmental changes and manufacturing variations.
Solution Approach 2:
The patent dynamically adjusts the on-resistance of active circuit devices by changing voltage and current parameters in response to detected conditions. This allows the attenuator to adapt its electrical characteristics to maintain precision across different operating conditions and manufacturing lots.
2Reliability
If conventional attenuators are used, then the ease of manufacture is high, but the reliability decreases due to temperature variations and process parameter shifts
Solution Approach 1:
The feedback mechanism continuously monitors voltage and resistance values and adjusts the on-resistance accordingly, compensating for temperature variations and process parameter shifts. This maintains consistent attenuation performance across different operating conditions and manufacturing lots, improving reliability without requiring tighter manufacturing tolerances.
Solution Approach 2:
The attenuator circuit performs self-adjustment by using its own operating parameters (voltage, current, on-resistance) to automatically compensate for drift and variations. This self-correcting mechanism ensures reliable operation without requiring external calibration or adjustment.
Data Source
AI summary
A circuit for attenuating a signal has an input configured to receive an input signal, an output configured to transmit an output signal, a first attenuation path (having a first active circuit device) between the input and the output, and a second attenuation path between the input and the output. The circuit also has an operational amplifier that, like most operational amplifiers, has a first op-amp input, a second op-amp input, and an op-amp output. In addition, the circuit has a voltage control device coupled with the first op-amp input, and a second active circuit device having a first active terminal coupled with the second op-amp input. A feedback loop is coupled between the op-amp output and a second active terminal of the second active circuit device. Moreover, the op-amp output also is coupled with the first active circuit device.