Process Voltage Temperature Independent Current Generator Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional current and voltage reference circuits in integrated circuits face challenges in maintaining stability and low power consumption, especially at reduced operating voltages, and require significant area and power, limiting their integration into smaller devices.
Innovation Solution
A current generator apparatus using a single amplifier to provide a constant current through a transistor, with a bias line controlled by an output voltage from the amplifier, which adjusts to process, voltage, and temperature changes, maintaining a temperature-independent current and reducing power consumption and area requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional current and voltage reference circuits are used, then stable reference voltage output is achieved, but power consumption increases and area requirements increase
Solution Approach 1:
The patent changes the operating parameters of the reference circuit to achieve stable reference voltage at lower power consumption. Specifically, it uses a single amplifier instead of multiple amplifiers, and operates at reduced voltage levels (1.0V-1.35V) while maintaining temperature independence through careful circuit design and transistor biasing arrangements.
Solution Approach 2:
The patent combines multiple functions into a single amplifier circuit, merging the roles of voltage regulation, current mirroring, and temperature compensation that were previously handled by separate circuits. This consolidation reduces the total number of active components, thereby reducing power consumption and area while maintaining reference stability.
2Stability of the object's composition
If conventional current and voltage reference circuits are used, then stable reference voltage output is achieved, but area requirements increase
Solution Approach 1:
The patent merges multiple reference circuit functions into a compact configuration using a single amplifier. The circuit integrates voltage reference generation, current mirroring, and temperature compensation in one unified structure, significantly reducing the area required compared to conventional separate circuits while maintaining stability.
Solution Approach 2:
The single amplifier in the patent performs multiple functions simultaneously: it regulates the reference voltage, maintains current mirroring accuracy, and provides temperature compensation. This multi-functionality allows the circuit to achieve stable reference output with minimal area occupation.
3Use of energy by stationary object
If operating voltage is reduced, then power consumption decreases, but maintaining temperature-independent current becomes more difficult
Solution Approach 1:
The patent carefully selects and adjusts operating parameters including transistor biasing conditions, resistor ratios, and amplifier operating points to achieve temperature-independent current generation at reduced voltages. The circuit is designed to operate in a specific voltage range (1.0V-1.35V) where temperature compensation can be effectively implemented.
Solution Approach 2:
The single amplifier provides negative feedback that automatically compensates for temperature-induced variations in transistor parameters. The feedback mechanism adjusts the reference voltage to maintain constant current flow through the mirrored transistors, ensuring temperature independence even at reduced operating voltages.
Data Source
AI summary
Apparatuses, methods, and current generators that generate current are described. An example apparatus includes a current source configured to provide a current. The current source may be coupled to a voltage source via a transistor. The transistor may be configured to provide the voltage source to the current source based on a voltage of a gate of the transistor. The example apparatus may further include an amplifier configured to provide a voltage to the gate of the transistor based on a voltage differential between two inputs. The voltage differential between the two inputs may adjust due to process, voltage or temperature changes such that the current provided by the current source remains constant.