RF Amplifier Pulse Modulation With Fast Charge Discharge
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Solution Overview
Problem
Existing radio frequency modulators lack an efficient mechanism to discharge stored charge when the amplifier is turned off, leading to residual voltage that takes time to dissipate, which can cause inefficiencies and prolong the amplifier's high impedance state.
Innovation Solution
A radio frequency modulator system with a first switching circuit to couple and decouple a dc voltage to the amplifier's output electrode and a second switching circuit to discharge stored charge when the voltage is decoupled, utilizing synchronized transistors and networks to manage the charging and discharging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a separate discharge circuit is added to discharge stored charge, then the discharge efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent combines the discharge circuit with the existing switching circuit by using the same control signal to simultaneously control both the switching transistor and the discharge transistor. This integration allows the discharge function to be added without requiring completely separate control logic, thereby improving discharge efficiency while minimizing the increase in device complexity.
Solution Approach 2:
The control signal serves multiple functions: it controls both the switching transistor for normal operation and the discharge transistor for charge discharge. This multi-functionality reduces the need for additional dedicated discharge control circuits, achieving efficient charge discharge without proportionally increasing system complexity.
2Loss of energy
If the amplifier is turned off, then power consumption is reduced, but residual voltage remains for an extended period
Solution Approach 1:
The discharge transistor is activated simultaneously with the switching transistor when the amplifier is turned off, creating a dedicated discharge path that immediately begins removing residual charge. This preliminary action ensures that residual voltage is discharged quickly rather than waiting for natural dissipation, thereby reducing the time the amplifier remains in a high impedance state while maintaining low power consumption.
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
The system ensures rapid and efficient discharge of stored charge, reducing the time the amplifier remains in a high impedance state and improving the overall efficiency of the amplification process by using synchronized switching circuits to manage the charging and discharging of the amplifier's output electrode.
Implementation Method 1
a first switching circuit response to an input pulse for coupling a dc voltage relative to a reference potential to the output electrode when the radio frequency signal is to be amplified
Implementation Method 2
A second switching circuit is responsive to the input pulse for discharging the stored charge when the dc voltage is decoupled from the output electrode
Implementation Method 3
wherein charge is stored in the storage element when the dc voltage is coupled to the output electrode
Data Source
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AI summary
A radio frequency modulator system having a radio frequency amplifier controlled by a pulse modulator. The pulse modulator includes: a first switching circuit response to an input pulse for coupling a dc voltage relative to a reference potential to the output electrode when the radio frequency signal is to be amplified by the radio frequency amplifier and for decoupling the dc voltage from the output electrode when the radio frequency signal is to be decoupled from the output electrode wherein charge is stored in the storage element when the dc voltage is coupled to the output electrode; and: a second switching circuit responsive to the input pulse for discharging the stored charge when the dc voltage is decoupled from the output electrode.