Dual Receiver Architecture With Feedback to Suppress DC Offset Noise
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Solution Overview
Problem
Conventional RF receiver architectures, particularly for microwave and millimeter wave systems, face challenges in reducing cost, size, and power consumption while maintaining performance, and they introduce DC offset and 1/f noise, limiting dynamic range. Additionally, they often require complex intermediate frequency conversion and lack effective antenna diversity solutions.
Innovation Solution
A radio frequency receiver architecture that directly converts RF modulated signals to baseband signals without intermediate frequency conversion, incorporating a receiver module that eliminates sidebands, performs analog-to-digital conversion, and uses a synthesizer module with programmable reference signals, along with a controller module that samples and provides feedback signals, and optionally includes a digital detector and temperature compensation. This architecture also supports antenna diversity configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If direct conversion architecture is used to reduce cost, size, and power consumption, then receiver size and power consumption are reduced, but DC offset and 1/f noise are introduced which limits dynamic range
Solution Approach 1:
The receiver is divided into two independent channels: a direct conversion channel for signal reception and a separate feedback channel for generating correction signals. This segmentation allows the harmful DC offset and 1/f noise to be addressed through the feedback channel without compromising the compact direct conversion architecture.
Solution Approach 2:
A feedback mechanism is implemented where a portion of the received signal is routed through a feedback channel that generates correction signals. These correction signals are fed back to cancel the DC offset and 1/f noise in the direct conversion channel, thereby extending the dynamic range while maintaining the compact architecture.
2Object-generated harmful factors
If intermediate frequency conversion is implemented to improve signal processing, then dynamic range is improved, but device complexity and size increase
Solution Approach 1:
A feedback channel acts as an intermediary mechanism that provides indirect signal processing. Instead of using traditional intermediate frequency conversion hardware, the feedback channel processes a portion of the received signal and generates correction signals that indirectly improve dynamic range by canceling harmful components.
3Reliability
If conventional receiver architecture is used to maintain signal quality, then reception reliability is maintained, but cost and power consumption increase
Solution Approach 1:
The feedback channel is merged with the direct conversion architecture in a unified receiver structure. This integration allows the system to maintain signal reception quality through the feedback mechanism while avoiding the need for separate intermediate frequency conversion hardware, thereby reducing 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 proposed solution reduces the size and power consumption of RF receivers, minimizes DC offset and 1/f noise, and enhances dynamic range, while enabling efficient antenna diversity to improve signal reception quality in microwave and millimeter wave systems.
Implementation Method 1
Each branch includes a mixer that initially receives the amplified signal... Each mixer is configured to nonlinearly process the amplified signal and control signal, resulting in output signal components at frequencies equal to the sum and difference of amplified signal and control signal frequencies
Implementation Method 2
A local oscillator 130 generally provides a sine or square wave signal as a control signal to each of the mixers
Implementation Method 3
The signal from the in-phase mixer 111 is then passed through a low pass filter 112 to a baseband amplifier 113 to complete the extraction of the baseband signal
Data Source
AI summary
A radio frequency receiver comprising a receiver module, an intermediate frequency (“IF”) module, a synthesizer module and a controller module. The receiver module receives a radio frequency signal and provides a baseband in-phase signal and a baseband quadrature signal, eliminates a sideband of the in-phase and quadrature signals to create a first and a second signal, downconverts the first and second signal to a first and a second IF signal, and selects one of the first or second IF signals. The IF module receives the first or second IF signal, performs analog-to-digital conversion on the first or second IF signal, and demodulates the digitally converted IF signal. The synthesizer module receives a programmable reference signal, downconverts the reference signal to an IF feedback signal, downconverts the reference signal to a baseband feedback signal, provides the IF feedback signal to the IF module, and provides the baseband feedback signal to the receiver module. The controller module samples the digitally converted IF signal and provides the programmable reference signal to the synthesizer module to thereby provide a demodulated output signal.