Bandgap Reference Circuit Startup via Bias Current
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Solution Overview
Problem
Existing bandgap reference circuits face challenges in simplifying circuit design and reducing power consumption, particularly due to sensitivity to process, voltage, and temperature (PVT) variations, and require complex starting circuits that consume additional power.
Innovation Solution
A bandgap reference power generation circuit comprising a bias circuit and a bandgap reference core circuit, where the bias circuit provides a starting current based on a bias voltage to stabilize the bandgap reference core circuit, eliminating the need for additional power consumption and detection circuits, thereby simplifying the design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a voltage detection starting circuit based on an inverter is used, then the circuit structure is simple and requires few devices, but the threshold is very difficult to control and may easily reach or even exceed ±50% under the effect of PVT
Solution Approach 1:
The patent changes the detection parameter from voltage to current. The starting circuit detects current at key nodes instead of voltage, which has a smaller detection threshold and is less sensitive to PVT variations. This current-based detection approach maintains circuit simplicity while significantly improving threshold control reliability.
2Reliability
If a voltage detection starting circuit based on a comparator with reference voltage is used, then the threshold may be controlled by a reference voltage, but an additional circuit is needed to obtain the reference voltage, the number of circuit devices is larger, and the static power consumption is larger
Solution Approach 1:
The patent merges the starting circuit functionality with the existing bandgap reference circuit nodes. Instead of adding separate reference voltage generation circuits, the starting circuit utilizes current detection at existing key nodes within the bandgap circuit, thereby achieving threshold control without increasing device count or power consumption.
Solution Approach 2:
The starting circuit performs self-service by using internal current detection within the bandgap circuit itself. The circuit detects its own operating state through current monitoring at key nodes, eliminating the need for external reference voltage circuits and achieving autonomous startup control.
3Device complexity
If a current detection starting circuit is used, then the threshold current can be simply expressed as a ratio of power supply voltage to resistance, but the current of the FET used is equal to that of a triode used, and power consumption is large
Solution Approach 1:
The patent applies partial action by using current detection only at specific key nodes during the startup phase, rather than continuously monitoring all currents. The detection is activated only when needed for startup, and the detection threshold is set to activate only under specific conditions, thereby reducing overall power consumption while maintaining simple circuit design.
Data Source
AI summary
The present disclosure discloses a bandgap reference power generation circuit and an integrated circuit. The bandgap reference power generation circuit includes a bias circuit and a bandgap reference core circuit. The bias circuit is configured to provide starting current according to a bias voltage. The bandgap reference core circuit is connected to the bias circuit to receive the starting current and goes into a stable operating state according to the starting current to output a preset voltage or preset current. The integrated circuit includes the bandgap reference power generation circuit. By the aforementioned method, the present disclosure can simplify a circuit design and reduce power consumption.