Bias Voltage Circuit Topology for Threshold-Variation Stability
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Solution Overview
Problem
Existing electronic devices face challenges in accurately generating bias voltages due to variations in transistor threshold voltages, which affect the stability and accuracy of output voltages.
Innovation Solution
The proposed solution involves a bias voltage generating device with a reference bias section and a driving section, utilizing diode-connected transistor pairs and impedance elements to stabilize the output voltage, and incorporating a sense section and gain section to further enhance stability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional voltage generation methods are used, then the device structure is simple, but the output voltage accuracy deteriorates due to transistor threshold voltage variations
Solution Approach 1:
The voltage generation device is divided into multiple functional sections: a reference bias section containing first and second transistor pairs, and a driving section containing third and fourth transistor pairs. Each section independently generates and processes bias voltages, allowing the system to achieve high accuracy through modular functional decomposition while maintaining manageable structural complexity.
Solution Approach 2:
Impedance elements are introduced as intermediary components connected between the reference bias section and the driving section. These impedance elements act as mediators that isolate and stabilize the bias voltage signals, preventing direct coupling of threshold voltage variations from affecting the final output voltage accuracy.
2Stability of the object's composition
If transistor threshold voltage variations are present, then the device structure remains simple, but the output voltage stability deteriorates
Solution Approach 1:
The reference bias section generates reference bias voltages that are fed into the driving section, creating a feedback mechanism. The diode-connected transistor pairs in both sections establish feedback loops that automatically compensate for threshold voltage variations, maintaining stable output voltages without requiring complex external control circuits.
Solution Approach 2:
Diode-connected transistor pairs are used to create equipotential conditions at critical nodes in the circuit. By connecting the gate and drain of transistors in parallel, the circuit maintains equal potentials that cancel out threshold voltage variations, thereby stabilizing the output voltages through inherent potential equalization.
Data Source
AI summary
A bias voltage generating device includes a reference bias circuit and a first transistor. The reference bias circuit includes a first diode-connected transistor pair and a second diode-connected transistor pair serially connected between a first voltage and a second voltage. The first diode-connected transistor pair includes a diode-connected p-type transistor and a diode-connected n-type transistor. The first transistor is coupled to the reference bias circuit, and configured to provide a third voltage based on the first voltage and the second voltage. Gates of the diode-connected p-type transistor and the diode-connected n-type transistor of the first diode-connected transistor pair are connected to a gate of the first transistor.