Receiver Control Loop Management During Bias Transitions
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Solution Overview
Problem
High performance receivers face challenges in maintaining proper operation due to changes in bias current and other characteristics, which can disrupt circuit operations and lead to malfunctions, especially when dealing with jammers or varying signal conditions.
Innovation Solution
The techniques involve modifying the operation of control loops, such as disabling or changing the time constant of DC and AGC loops, and waiting for the receiver to settle before enabling them again, in conjunction with adjusting bias current and linearity states, to ensure stable operation across different conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bias current is changed to improve linearity when jammers are present, then linearity is improved, but control loops may be disrupted causing receiver malfunction
Solution Approach 1:
The patent applies preliminary action by disabling control loops (DC offset correction loop and AGC loop) before changing bias current. This prevents the control loops from being disrupted by the bias current transition, ensuring reliable receiver operation while still allowing linearity improvement. The control loops are re-enabled after the bias current change completes, maintaining both performance and stability.
2Loss of energy
If bias current is reduced to decrease power consumption, then power consumption is reduced, but receiver performance may deteriorate
Solution Approach 1:
The patent implements dynamics by making bias current adjustable based on operating conditions. The receiver can switch between high bias current (for high performance when jammers are present) and low bias current (for low power consumption when jammers are absent). The control loop disabling mechanism ensures smooth transitions between these dynamic states without performance degradation.
3Stability of the object's composition
If control loops are continuously enabled to maintain receiver stability, then receiver stability is maintained, but transient errors during bias current changes cannot be mitigated
Solution Approach 1:
The patent applies preliminary anti-action by disabling control loops before bias current changes occur. This prevents the control loops from generating transient frequency errors during the transition. After the bias current change completes, the control loops are re-enabled to restore stability. This approach simultaneously maintains both stability and frequency accuracy.
Data Source
AI summary
Techniques for controlling operation of control loops in a receiver are described. The operation of at least one control loop is modified in conjunction with a change in operating state, which may correspond to a change in linearity state, gain state, operating frequency, antenna configuration, etc. A change in linearity state may occur when jammers are detected and may cause bias current of analog circuit blocks to be adjusted. The at least one control loop to be modified may include a DC loop, an AGC loop, etc. The operation of a control loop may be modified by disabling the control loop or changing its time constant prior to changing operating state, waiting a predetermined amount of time to allow the receiver to settle, and enabling the control loop or restoring its time constant after waiting the predetermined amount of time.