Back-to-Back Unity-Gain Voltage Network for Low-Noise Accuracy
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Solution Overview
Problem
Existing voltage delivery networks struggle to achieve both high accuracy and low noise simultaneously due to the trade-off between using large resistors and capacitors, which cause voltage drops and noise, respectively.
Innovation Solution
A voltage delivery network utilizing a back-to-back connection topology of unity gain amplifiers, serial resistors, and shunt capacitors to maintain DC level equality and suppress noise, employing a low-pass filter configuration to ensure accuracy and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large resistor and large capacitor are used in the RC low-pass filter to ensure low noise, then the noise filtering performance is improved, but the voltage drop (IR drop) increases causing the DC level accuracy to deteriorate
Solution Approach 1:
The voltage delivery network is segmented into multiple functional blocks: a first voltage delivery network delivering bias voltage to a first node, and a second voltage delivery network delivering filtered voltage to a second node. This segmentation allows independent optimization of each network's parameters, enabling the first network to prioritize accuracy while the second network prioritizes noise filtering.
Solution Approach 2:
A buffer circuit is introduced as an intermediary between the bias voltage delivery network and the slave circuit. The buffer circuit isolates the two networks, allowing the RC low-pass filter to operate with large R and C values for noise filtering without directly affecting the DC accuracy of the bias voltage delivery path.
2Measurement precision
If a small resistor is used in the RC low-pass filter to maintain DC level accuracy, then the voltage drop is reduced, but the noise filtering performance deteriorates
Solution Approach 1:
The voltage delivery system is divided into separate functional networks, allowing the RC filter to use small resistor values for accurate DC voltage delivery while the buffer circuit and filter capacitor collectively provide the necessary noise filtering function.
Solution Approach 2:
The patent changes the operating parameters of the RC filter by using smaller resistor values compared to conventional designs. This parameter change is compensated by the buffer circuit's ability to drive the filter capacitor, maintaining noise filtering effectiveness while improving DC accuracy.
3Object-affected harmful factors
If a large capacitor is used in the RC low-pass filter to achieve low corner frequency and low noise, then the noise filtering is improved, but the circuit complexity and component size increase
Solution Approach 1:
The buffer circuit serves multiple functions simultaneously: it acts as a voltage follower for accurate DC voltage delivery, provides current buffering capability, and works with the RC filter to achieve noise filtering. This multi-functionality reduces the need for additional dedicated filtering components.
Solution Approach 2:
The patent employs dynamic compensation techniques where the buffer circuit actively maintains the desired voltage level at the filter output despite variations in load conditions. This dynamic adjustment allows the use of smaller, more practical capacitor values while maintaining effective noise filtering.
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 network achieves high accuracy and low noise by maintaining DC level equality and effectively suppressing noise through a combination of unity gain amplifiers and low-pass filters, ensuring precise voltage delivery with minimal noise.
Implementation Method 1
A common way of noise filtering is using a RC (which means resistor-capacitor) low-pass filter
Implementation Method 2
a first capacitor inserted between the second node and a DC (direct current) node
Implementation Method 3
a first resistor inserted between the third node and the second node
Data Source
AI summary
A voltage delivery network includes a first unity gain amplifier and a second unity gain amplifier configured in a back-to-back connection topology to receive a first voltage and a second voltage at a first node and a second node, respectively, and jointly output a third voltage at a third node. The network delivery network further includes a first resistor inserted between the third node and the second node; and a first capacitor inserted between the second node and a DC (direct current) node.