Configurable switch voltage drop precision current detection power supply switch circuit structure

Abstract

The invention discloses a configurable switch voltage drop precision current detection power supply switch circuit structure. The power supply switch circuit structure is applied to a communication circuit requiring an external power supply. In some circuit structures, in order to improve the performance of the overall circuit, some high-performance circuit modules are often added into the circuit. The high-performance modules are not easy to integrate, and need a separate power supply. Generally, some power supply switch circuit structures are designed to power the modules. A power supply switch module powers a load module and makes corresponding judgments according to the magnitude of current drawn by the load module. If the load current is less than a certain value, the circuit is considered to work in a state when the load is intervened. If the load current is greater than a value, the circuit works in another state when the load module is accessed. The power supply switch circuit provided by the invention can provide configurable switch voltage drop for the load module, judges the work state of the load circuit according to the magnitude of the load current drawn by the load module, and outputs corresponding state information.

Description

technical field [0001] The invention relates to a circuit structure for supplying power to some unintegrated circuit modules, and belongs to the field of hardware circuits. Background technique [0002] In actual circuit applications, it is often necessary to add some high-performance, difficult-to-integrate modules to improve the overall performance of the circuit. These circuits need to be powered separately during application to avoid crosstalk with other circuits; at the same time, the module responsible for power supply also needs to monitor the current drawn by the load module, so as to judge the working status of the load module according to the magnitude of the load current. For example, in navigation applications, the signal sent by the satellite to the ground is very weak, and changes in the surrounding environment have a greater impact on the receiver that receives and processes the satellite signal. In order to overcome this difficulty, the antenna part that is ...

AI Technical Summary

Problems solved by technology

[0005] But the power switch module of this traditional structure has two problems: the ratio of the current flowing in the M2 tube and the M1 tube current is relatively discrete; the power supply voltage of the load module (that is, the drain potential of the M1 tube) has a relatively large discrete

[0007] Another question: When M1 works in the linear region, the equivalent on-resistance is a value affected by the device process characteristics

Especially in the CMOS process, the discreteness of the device is relatively large, so the power supply voltage of the power switch module will be affected by the value of the M1 on-resistance. This problem needs to be optimized

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