Broadcast Receiver LNA Power Path for Stable RF Sensitivity
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Solution Overview
Problem
Broadcasting receiving apparatuses face challenges in extending their receive sensitivity range and maintaining stable sensitivity due to the lack of effective power supply to Low Noise Amplifiers (LNAs), which are not adequately controlled, leading to noise amplification and instability in signal reception across varying electric field strengths.
Innovation Solution
A broadcasting receiving apparatus with a supply unit connected in parallel to the RF attenuating unit to provide DC voltage to the LNA, allowing active control of the LNA based on electric field strength, enabling the extension of receive sensitivity range and maintaining stable sensitivity by selectively amplifying or bypassing the signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the LNA is not provided with a power supply path in the RF attenuator, then the device complexity is reduced, but the receive sensitivity range cannot be extended and stable receive sensitivity cannot be maintained
Solution Approach 1:
The RF attenuator is designed to perform dual functions: both signal attenuation and power supply delivery. By integrating the power supply path within the existing RF attenuator structure, the component serves multiple purposes without adding separate dedicated power supply circuits, thereby extending receive sensitivity range while avoiding increased device complexity.
Solution Approach 2:
The power supply path is merged with the RF signal path in the RF attenuator. The same physical structure that attenuates RF signals also provides the power supply connection to the LNA, combining two previously separate functions into a single integrated component.
2Reliability
If the LNA is not effectively controlled, then the ease of operation is improved, but the receive sensitivity stability deteriorates
Solution Approach 1:
An automatic gain control (AGC) system is implemented that provides feedback control of the LNA power supply. The RF attenuator receives an AGC control signal and adjusts the power supply voltage to the LNA accordingly, enabling automatic adaptation to varying signal conditions and maintaining stable receive sensitivity without complex manual control mechanisms.
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 solution effectively extends the receive sensitivity range and ensures stable sensitivity by actively controlling the LNA, improving signal amplification for weak signals and adjusting attenuation for strong signals, thereby enhancing the overall performance of the broadcasting receiving apparatus.
Implementation Method 1
a low noise amplifier low-noise-amplifying a signal received through an antenna
Implementation Method 2
an RF attenuating unit attenuating the received RF signal to output the attenuated RF signal
Implementation Method 3
a supply unit supplying a DC voltage to the low noise amplifying unit, wherein the supply unit is connected in parallel to both sides of the RF attenuating unit
Implementation Method 4
a control unit controlling an output of the DC voltage depending on a change of an electric field strength of the received signal
Data Source
AI summary
Provided are a broadcasting receiving apparatus and a broadcasting receiving method using the same. The broadcasting receiving apparatus including: a low noise amplifying unit low-noise-amplifying an RF signal received from an antenna; an RF attenuating unit attenuating the received RF signal to output the attenuated RF signal; a supply unit supplying a DC voltage to the low noise amplifying unit; and a control unit controlling an output of the DC voltage depending on a change of an electric field strength of the received signal.