NFC Chip Ground-Resistor Switching for Stable Receive Voltage
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Solution Overview
Problem
Existing near field communication (NFC) apparatuses exhibit poor performance consistency due to deviations in antenna, matching network, and chip manufacturing, leading to inconsistent user experiences and low yield.
Innovation Solution
A near field communication chip with a power amplifier module containing a ground resistor and control switch, transitioning between low-power and high-power modes based on receive end voltage thresholds, to stabilize received voltage and improve consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If near field communication apparatuses are manufactured with standard components (antenna, matching network, chip), then production cost and complexity are reduced, but performance consistency deteriorates due to manufacturing deviations
Solution Approach 1:
The patent introduces a ground resistor with a specific resistance value range (0.1-10 ohms) in the power amplifier module to compensate for manufacturing deviations. By adjusting this parameter within the specified range, the system can adapt to variations in antenna and matching network components, thereby maintaining performance consistency without requiring precise manufacturing of all components.
Solution Approach 2:
The patent implements a feedback mechanism where the control switch monitors the received voltage at the receive end and adjusts the connection state of the ground resistor accordingly. When the received voltage exceeds the first threshold, the control switch connects the transmission end to the ground resistor, creating a feedback loop that stabilizes performance despite component variations.
2Reliability
If screening is applied to remove poor performance apparatuses, then performance consistency is improved, but yield deteriorates
Solution Approach 1:
The patent incorporates a ground resistor with optimized resistance value (0.1-10 ohms) as a compensating element that proactively counteracts the adverse effects of component deviations before they result in poor performance. This beforehand cushioning approach allows apparatuses with varying component qualities to maintain acceptable performance, reducing the need for aggressive screening and improving yield.
3Reliability
If the transmission end is always connected to ground for stability, then performance consistency is improved, but power consumption increases
Solution Approach 1:
The patent employs a control switch that dynamically adjusts the connection state of the ground resistor based on real-time monitoring of received voltage. The switch connects the transmission end to ground only when necessary (when received voltage exceeds the first threshold), rather than maintaining a constant connection. This dynamic adjustment maintains performance consistency while minimizing unnecessary power consumption.
Solution Approach 2:
The control switch operates periodically by monitoring the received voltage and switching the ground resistor connection state accordingly. This periodic action ensures the system maintains stability when needed while remaining in a low-power state during normal operation, thus balancing performance consistency with power consumption.
Data Source
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AI summary
A near field communication chip, an apparatus, an electronic device and a method are provided. The chip includes a power amplifier module and a transmission control module. The power amplifier module comprises a ground resistor and a control switch. One end of the control switch is connected to the transmission end, the other end of the control switch is connected to the ground resistor, the control switch controls the transmission end to be connected to the ground resistor or be floating based on a control signal. When a received voltage at the receive end is greater than or equal to a first threshold, the near chip transitions from a low-power mode to a high-power mode. The transmission control module transmits the control signal to control the transmission end to be connected to the ground resistor, and the first threshold is set based on receive sensitivity of the receive end.