Baseband Receiver Filter Calibration Without a Process Monitor
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Solution Overview
Problem
Conventional receiver filter calibration techniques require a process monitor and fail to account for non-idealities in operational amplifiers, leading to incomplete and inaccurate calibration.
Innovation Solution
A method and circuit configuration that disconnects amplifier stages, injects signals to calibrate resistors and capacitors within the receiver circuit, adjusting their values to match predefined frequency responses, thereby accounting for amplifier non-idealities without a process monitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional receiver filter calibration techniques using a process monitor are employed, then calibration can be performed, but the circuit complexity increases and amplifier non-idealities are not accounted for
Solution Approach 1:
The patent extracts and removes the process monitor from the calibration system, replacing it with a method that uses the receiver circuit's own components (amplifier stages, resistors, capacitors) for self-calibration. This eliminates the need for external monitoring equipment while maintaining calibration accuracy by directly measuring and adjusting the actual circuit components.
Solution Approach 2:
The receiver circuit performs self-calibration by using its own amplifier stages and components to measure and adjust its performance characteristics. The calibration process leverages the circuit's intrinsic properties rather than relying on external process monitors, making the system self-sufficient and reducing overall complexity.
2Measurement precision
If conventional calibration methods that do not disconnect amplifier stages are used, then the circuit remains continuous, but calibration accuracy is reduced due to amplifier non-idealities
Solution Approach 1:
The calibration process is segmented into distinct phases where amplifier stages are temporarily disconnected during measurement and adjustment, then reconnected for operational mode. This segmentation allows independent calibration of each stage without interference from amplifier non-idealities, improving accuracy while maintaining operational simplicity through automated switching.
Data Source
AI summary
Methods and apparatus for baseband receiver circuits are disclosed. An example receiver circuit includes a first amplifier stage to receive input signals and generate intermediate signals responsive to the one or more input signals and based at least in part on one or more amplifiers, one or more capacitors, and one or more resistors of the first amplifier stage, a second amplifier stage to receive the intermediate signals and generate output signals responsive to the one or more intermediate signals based at least in part on one or more amplifiers, one or more capacitors, and one or more resistors of the second amplifier stage, and calibration logic configured to disconnect the first amplifier stage from the second amplifier stage, inject one or more first signals into at least the first amplifier stage and calibrate at least the first amplifier stage based at least in part on a frequency response of the first amplifier stage to the injected one or more first signals.