Wide Gain Range RF Receiver Using Sliced LNA and Passive Attenuation
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Solution Overview
Problem
Existing RF receivers face challenges in supporting multiple communication standards with separate circuitry, leading to increased product costs and shorter battery life due to the need for multiple transceivers, while also struggling to accommodate varying receive signal strengths effectively.
Innovation Solution
A receiver design incorporating a passive gain stage, sliced LNA stage, mixer, and programmable gain amplifier (PGA) with adjustable source degeneration and gain control mechanisms, allowing for flexible gain adjustment across a wide range of input signal strengths, using a common antenna and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate circuitry is used for each communication standard, then communication compatibility is improved, but product cost increases
Solution Approach 1:
The receiver is designed with a universal front-end circuit that can handle multiple communication standards (WiFi, Bluetooth, Zigbee, NFC) through a single integrated structure. The balanced/unbalanced circuit configuration and variable gain amplifier work together to process signals from different standards without requiring separate dedicated circuitry for each standard, thereby reducing product cost while maintaining multi-standard compatibility.
Solution Approach 2:
The receiver employs dynamic gain control through a variable gain amplifier that can adjust its amplification factor based on the received signal strength. This dynamic adjustment capability allows the same circuit to effectively handle signals from different communication standards with varying power levels, eliminating the need for multiple fixed-gain circuits and reducing overall system complexity and cost.
2Adaptability or versatility
If multiple transceivers are used to support different standards, then communication versatility is improved, but battery life decreases
Solution Approach 1:
Instead of implementing multiple separate transceivers for different communication standards, the invention uses a single universal receiver with a multi-standard capable front-end. This unified approach consolidates the radio frequency processing functions into one energy-efficient transceiver, avoiding the redundant power consumption that would result from running multiple independent transceivers simultaneously or sequentially.
Solution Approach 2:
The invention merges the signal reception and processing functions for multiple communication standards into a single integrated receiver circuit. By combining WiFi, Bluetooth, Zigbee, and NFC reception capabilities into one shared front-end with common LNA, mixer, and variable gain amplifier stages, the system eliminates the power overhead of multiple separate transceiver circuits while maintaining the ability to support all these standards.
3Device complexity
If a common antenna is used for different standards, then device complexity is reduced, but signal strength accommodation becomes difficult
Solution Approach 1:
The receiver incorporates a variable gain amplifier that dynamically adjusts its amplification factor based on the strength of the received signal. This dynamic gain control enables the system to effectively accommodate signals of varying strengths from different communication standards using a common antenna, without requiring multiple antennas or complex switching networks. The VGA compensates for signal strength differences, allowing the single antenna to serve multiple standards effectively.
4Device complexity
If fixed gain amplification is used, then circuit simplicity is maintained, but performance across varying signal strengths deteriorates
Solution Approach 1:
The receiver employs a variable gain amplifier that can dynamically adjust its amplification factor based on the received signal strength. This dynamic gain control ensures consistent performance across a wide range of signal strengths by automatically compensating for weak or strong signals, thereby improving reliability without significantly increasing circuit complexity. The VGA is integrated into the existing signal path, adding minimal complexity while providing substantial performance improvement.
Data Source
AI summary
A receiver comprises a passive gain stage having an input to receive an in-going radio frequency (RF) signal and a gain control signal to produce an adjusted in-going RF signal, a sliced LNA stage comprising a plurality of LNAs coupled to receive the in-going RF signal. Each LNA includes an adjustable source degeneration circuit for receiving a plurality of gain selection and control signals and an output port to produce an amplified in-going RF signal. A mixer is coupled to receive at least one of the amplified in-going RF signals produced by the sliced LNA stage and is configured to produce a converted signal at another frequency. A PGA is coupled to receive the down-converted signal and produces an amplified in-going signal.