RFID Digital Power Amplifier Using Driver-Block Sinusoid Synthesis
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Solution Overview
Problem
High-voltage digital power amplifiers used in RFID devices have a large number of discrete components in their adaptation circuits, increasing size and manufacturing costs, and these components cannot be integrated due to high inductive reactance and capacitance requirements.
Innovation Solution
A digital power amplifier with an integrated circuit that includes a digital control section with wave-forming contacts and driver blocks to generate increments of sinusoidal output current, eliminating the need for external filter means by producing an analogue sinusoidal output directly at the output pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If external filter means and resonance means with high inductive reactance and capacitance are used to generate sinusoidal output current, then the output signal quality meets spurious emission regulations, but the number of discrete components increases and integration becomes impossible
Solution Approach 1:
The patent combines the filter means and resonance means into a single integrated resonance circuit that is directly coupled to the output stage of the power amplifier. This merging eliminates the need for separate external filter components while maintaining the sinusoidal output current quality required to meet spurious emission regulations.
Solution Approach 2:
The patent introduces a specifically designed resonance circuit as an intermediary element between the power amplifier output stage and the RFID antenna. This resonance circuit acts as a mediator that shapes the output current into a sinusoidal waveform while being directly integrable with the amplifier, thus reducing the number of discrete components needed.
2Object-affected harmful factors
If external filter means and resonance means are used to adapt the output signal, then the sinusoidal output current is achieved, but the size and manufacturing costs increase
Solution Approach 1:
The patent merges the filter and resonance functions into a single integrated circuit block that can be manufactured as part of the power amplifier chip itself. This integration reduces manufacturing costs by eliminating the need for separate discrete components and simplifying the assembly process.
Solution Approach 2:
The patent replaces the traditional mechanical/discrete component-based filter and resonance circuit with an integrated electronic circuit implementation. This substitution enables direct integration into the power amplifier chip, reducing size and manufacturing complexity while maintaining the required sinusoidal output current quality.
3Speed
If high inductive reactance and capacitance components are used in the adaption circuit, then the transmission resonance frequency is achieved, but integration into the integrated circuit becomes substantially not possible
Solution Approach 1:
The patent changes the design parameters of the resonance circuit to use lower inductance and capacitance values that are compatible with integrated circuit fabrication processes. By adjusting these parameters, the resonance frequency is maintained while the components become small enough to be integrated directly into the power amplifier chip.
Solution Approach 2:
The patent replaces traditional discrete inductors and capacitors with integrated electronic implementations using on-chip inductors, capacitors, or equivalent circuit topologies that can be fabricated using standard CMOS or bipolar process technologies. This substitution enables direct integration while maintaining the required transmission resonance frequency.
Data Source
AI summary
A digital power amplifier comprises: an integrated circuit (IC2); an adaption circuit of discrete components connected to first and second transmission output pins of an integrated circuit to adapt the output signal and feed a substantial sinusoidal output current with a transmission resonance frequency to an RFID antenna. IC2 comprises a digital control section with N wave-forming contacts to output a digital wave-forming bit combination of N bits with a clock frequency M-times the transmission resonance frequency; N driver blocks each connected with a first contact to one of the wave-forming contacts and N/2 of them connected with a second contact to the first transmission output pin and the other N/2 of them connected with their second contact to the second transmission output pin. The driver blocks provide increments of the substantial sinusoidal output current to the first and second transmission output pins.