Bias-Voltage-Adjustable RF Communications Apparatus
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Solution Overview
Problem
The implementation of single-ended signal transmission between the RF part and the baseband processor in communications apparatuses poses challenges due to the high dynamic input range requirements for analog-to-digital converters, leading to increased complexity and costs.
Innovation Solution
A bias-voltage-adjustable communications apparatus is introduced, featuring an RF part, an analog-to-digital converter, a digital baseband communications processor, a voltage controller, and a voltage generator, which allows for adjustment of bias voltages to reduce the difference between them, enabling the analog-to-digital converter to operate within a smaller dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-ended signal transmission is used between RF part and baseband processor, then hardware complexity and interface costs are reduced, but the dynamic input range requirement for analog-to-digital converter increases significantly
Solution Approach 1:
The patent applies preliminary action by adjusting the bias voltage of the RF part before signal transmission to match the dynamic input range of the analog-to-digital converter. The voltage controller pre-adjusts the bias voltage based on the difference between the RF part's bias voltage and the ADC's reference voltage, ensuring the ADC receives signals within its optimal input range before conversion occurs.
Solution Approach 2:
The patent changes the bias voltage parameter of the RF part to resolve the contradiction. By dynamically adjusting the bias voltage through the voltage controller and voltage generator, the system adapts the RF part's output characteristics to match the ADC's input requirements, thereby reducing the required dynamic input range while maintaining single-ended transmission simplicity.
2Device complexity
If single-ended signal transmission is used, then the number of interfaces is reduced from 4 to 2, but the design and manufacturing costs of analog-to-digital converter increase
Solution Approach 1:
The patent changes the bias voltage parameter to reduce the ADC's design burden. By adjusting the RF part's bias voltage to match the ADC's reference voltage, the system reduces the voltage swing and dynamic range requirements for the ADC, making it easier to design and manufacture while maintaining the cost-saving benefit of reduced interface count.
Solution Approach 2:
The patent implements feedback through the voltage controller, which continuously monitors the difference between the RF part's bias voltage and the ADC's reference voltage. The controller adjusts the bias voltage based on this feedback signal, ensuring optimal operating conditions for the ADC and reducing design complexity without requiring additional interfaces.
3Ease of operation
If bias voltage difference between RF part and analog-to-digital converter is large, then single-ended transmission can be implemented, but the analog-to-digital converter requires large dynamic input range making implementation complicated
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the bias voltage of the RF part to minimize the difference with the ADC's reference voltage before signal transmission. This preliminary voltage matching simplifies the ADC's design requirements while preserving the ease of single-ended transmission operation.
Solution Approach 2:
The voltage controller acts as an intermediary between the RF part and the ADC, mediating the bias voltage difference. It receives feedback about the voltage difference and adjusts the RF part's bias voltage accordingly, enabling single-ended transmission while keeping the ADC's design complexity manageable through intermediate voltage adjustment.
Data Source
AI summary
A bias-voltage-adjustable communications apparatus including a radio frequency RF part, an analog-to-digital converter, a digital baseband communications processor, a voltage controller, and a voltage generator. The RF part is coupled to the analog-to-digital converter and the voltage controller. The voltage generator is coupled to the analog-to-digital converter and the voltage controller. The analog-to-digital converter is coupled to the digital baseband communications processor. In an adjustment mode, the RF part is configured to generate a single-ended reference signal, where the single-ended reference signal includes a first bias voltage; the voltage generator is configured to generate a second bias voltage; and the voltage controller is configured to obtain a difference between the first bias voltage and the second bias voltage, and generate a control signal based on the difference, where the control signal is configured to adjust the first bias voltage or the second bias voltage to decrease the difference.