Dynamic Receiver Linearity Control for Power Reduction
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Solution Overview
Problem
CDMA-based mobile stations face a conflict between achieving high amplifier linearity and low phase noise, which increases power consumption, while consumers demand longer talk times, necessitating a reduction in power consumption without compromising performance.
Innovation Solution
Implement a dynamic optimization of amplifier linearity and frequency synthesizer single sideband phase noise by adjusting current consumption based on input signal levels and gain settings, using a digital signal processor to control current in various receiver components, such as the LNA, mixer, and voltage-controlled oscillator, while maintaining acceptable performance parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver is designed to achieve high amplifier linearity and low phase noise, then performance is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the receiver parameters (amplifier linearity and phase noise) adjustable rather than fixed. The system dynamically changes the linearity and phase noise characteristics based on the detected signal conditions, allowing optimal performance at different operating points. This resolves the contradiction by enabling the receiver to adapt its power consumption and performance characteristics to match the actual environmental conditions.
Solution Approach 2:
The patent changes physical parameters (amplifier linearity and frequency synthesizer phase noise) based on operating conditions. By detecting signal levels and adjusting the receiver parameters accordingly, the system achieves high performance when needed while reducing power consumption when signal conditions permit. This parameter adaptation directly resolves the contradiction between maintaining high performance and reducing power usage.
2Reliability
If amplifier linearity is increased to handle harsh wireless environment, then signal quality is improved, but power consumption increases
Solution Approach 1:
The patent changes the amplifier linearity parameter dynamically based on detected signal conditions. When the environment is harsh and signal quality requires high linearity, the system increases it. When conditions are favorable, the system reduces linearity to save power. This conditional parameter adjustment resolves the contradiction between signal quality and power consumption.
Solution Approach 2:
The system makes amplifier linearity dynamic rather than static, allowing it to adapt to changing wireless environment conditions. This dynamic adjustment enables the receiver to maintain signal quality when necessary while conserving power when the harsh environment conditions do not require maximum linearity.
3Reliability
If frequency synthesizer phase noise is reduced to improve receiver performance, then carrier-to-noise ratio is improved, but power consumption increases
Solution Approach 1:
The patent changes the frequency synthesizer phase noise parameter dynamically based on receiver gain settings and signal conditions. When high carrier-to-noise ratio is required, the system reduces phase noise. When conditions permit, the system increases phase noise tolerance to reduce power consumption. This conditional adjustment resolves the contradiction between carrier-to-noise ratio and power consumption.
Data Source
AI summary
A comparison is made in a number of scenarios of a current channel gain setting for a receiver to a threshold. If the current channel gain setting is less than the threshold, then current within at least a portion of the receiver is decreased. In one scenario, the comparison is only made in event that no single tone interferer is detected. In another scenario, the comparison is made to a tolerable single tone blocker threshold, and if greater then current is decreased. In another scenario, the comparison is made to an acceptable intermodulation response rejection threshold, and if greater then current is decreased. In yet another scenario, the comparison is made to an acceptable spurious free dynamic range threshold, and if greater then current is decreased. The portions of the receiver for which current decreases are implemented include a low noise amplifier, mixer, voltage controlled oscillator and variable gain amplifiers.