Differential Rectifier Peak Detector With Shared Full-Wave Circuit
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Solution Overview
Problem
Existing rectifier and peak-detector circuits for analog signals require replication of circuit branches, leading to high area occupation and potential mismatches, resulting in offsets and increased ripple amplitude due to half-wave rectification.
Innovation Solution
A signal-processing circuit with four voltage-controlled current generators and resistors that utilize both differential input signals to achieve full-wave rectification, reducing ripple amplitude and allowing for a single integrated circuit design with improved component matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate detection circuit branches are used for each differential signal, then each signal can be processed independently, but area occupation increases and component mismatches occur
Solution Approach 1:
The patent combines the detection of both differential signals into a single shared detection circuit branch. The operational amplifier, diode, and capacitor are共用 by both signals, eliminating the need for separate circuit branches. This merging reduces circuit area while maintaining detection accuracy through differential input stages that process both signals simultaneously.
Solution Approach 2:
The detection circuit branch is designed to handle both differential signals VP(t) and VM(t) through its differential inputs. The operational amplifier and associated components serve multiple functions: detecting positive peaks from one signal and negative peaks from the other signal, thereby reducing the need for duplicate circuitry.
2Adaptability or versatility
If separate detection circuit branches are used, then independent processing is achieved, but component mismatches lead to offsets
Solution Approach 1:
By merging the detection circuit into a single branch with differential inputs, the patent ensures that both signals share the same operational amplifier, diode, and capacitor. This shared architecture eliminates component mismatches between separate branches, as all components are identical and共用, thereby improving measurement precision while maintaining adaptability through differential processing.
3Device complexity
If half-wave rectification is used in separate branches, then circuit simplicity is maintained, but ripple amplitude increases
Solution Approach 1:
The patent inverts the traditional approach by using a single detection branch with differential inputs instead of separate half-wave rectifier branches. The operational amplifier configuration with diode and capacitor detects both positive and negative peaks through differential processing, effectively performing full-wave rectification functionality while maintaining circuit simplicity. This inversion reduces ripple amplitude by utilizing both signal half-cycles.
4Reliability
If multiple separate circuit branches are replicated, then complete signal coverage is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple detection functions into a single integrated circuit branch with differential inputs. This single branch processes both differential signals simultaneously, eliminating the need to replicate entire circuit branches. The integration is simplified as all components (operational amplifier, diode, capacitor) are共用, reducing manufacturing complexity while maintaining complete signal detection coverage through differential processing.
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 circuit effectively detects both positive and negative peak amplitudes of differential signals with reduced ripple, enabling efficient processing and integration while maintaining accurate signal matching and reduced component values.
Implementation Method 1
an operational amplifier 5a, 5b having its non-inverting input connected to the first/second input 2a, 2b and its inverting input connected in feedback mode to the first/second output 4a, 4b
Implementation Method 2
a diode 6a, 6b connected between the output of the operational amplifier 5a, 5b and the first/second output 4a, 4b
Implementation Method 3
a capacitor 8a, 8b, connected between the third input 2c and the anode/cathode of the corresponding diode 6a, 6b
Implementation Method 4
a current generator 9a, 9b connected between the first/second output 4a, 4b and, respectively, a reference voltage GND and a supply voltage VDD
Data Source
AI summary
A signal-processing circuit has a first and a second input, which receive a first and a second differential signal, a third input, which receives a common-mode signal, the first and second differential signals having an equal and substantially opposite trend with respect to the common-mode signal, and a first output supplying a first processed signal, equivalent to the first differential signal rectified with respect to the common-mode signal, and satisfying throughout its course a first relation of comparison with the common-mode signal. The processing circuit is provided with first formation means for formation of the first processed signal, which operate on the basis of the first differential signal, and second formation means for formation of the first processed signal, which operate on the basis of the second differential signal; the first and second formation means co-operate in the formation of the first processed signal.