Power Amplifier Bias Calibration After Dummy-Pulse Warm-Up
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Solution Overview
Problem
Existing power amplifier calibration methods fail to accurately determine the bias signal for high-power amplifiers, particularly in radar systems, leading to transient responses and improper bias settings due to cold start conditions.
Innovation Solution
A power amplifier calibration system and method that warms up the amplifier using dummy pulses to reach a steady state, then sweeps gate voltages to measure and set a desired drain current, ensuring a proper bias signal is established for future operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If power amplifier calibration is performed at cold start, then calibration speed is improved, but measurement precision deteriorates due to transient responses
Solution Approach 1:
The patent applies preliminary action by performing a warm-up phase before calibration. Dummy pulses are sent to the power amplifier to bring it to steady-state operating conditions before the actual bias calibration measurement begins. This preliminary warming up eliminates transient responses that would otherwise corrupt the calibration measurement, ensuring both speed and precision.
2Measurement precision
If dummy pulses are sent to warm up power amplifier, then measurement precision is improved, but duration of action increases
Solution Approach 1:
The patent uses periodic action by sending a sequence of dummy pulses at a specific repetition rate to the power amplifier during the warm-up phase. This periodic pulsing efficiently brings the amplifier to steady-state conditions faster than continuous operation would, optimizing the balance between precision and time.
Data Source
AI summary
Power amplifier calibration systems and methods are disclosed. In one aspect, the method is well-suited for use in calibrating a high-power amplifier such as might be used in a radar installation. The method warms up the power amplifier by sending a realistic signal, including dummy pulses to the power amplifier for a period of time until the power amplifier reaches an approximate steady state of operation. A calibration tool then sweeps a voltage level at a gate of the power amplifier through a range of voltages until a desired drain current is measured. The voltage corresponding to the desired drain current is then used as a bias voltage for future operation. By allowing the power amplifier to reach the steady state, transient responses that may occur at a cold start are avoided and a proper bias signal determined.