一种高精度宽压域电流镜系统
By using a high-precision wide-voltage-range current mirror system that shares the gate and source voltages of transistors, and combining a reference current module and a voltage follower module, the balance between the dynamic range and accuracy of the output voltage in the current mirror system is solved, achieving high-precision current mirror matching and current transfer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING ZHILINGXIN TECH CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-17
AI Technical Summary
Existing current mirror systems struggle to balance output voltage dynamic range and accuracy, especially in low-voltage applications or wide dynamic range scenarios where they exhibit significant shortcomings.
Employing a high-precision wide-voltage-range current mirror system, by sharing the gate and source voltages of the transistor, and combining a reference current module and a voltage follower module, the system ensures a precise mirror match between the output current and the reference current, maintaining high accuracy under varying power supply voltages and loads.
It achieves the same maximum output voltage operating range as the traditional architecture, while ensuring precise matching between the output current and the reference current, improving the integrity and accuracy of current transmission. The reference current can be adjusted arbitrarily according to requirements.
Smart Images
Figure CN224519206U_ABST
Abstract
Claims
1. A high precision wide voltage range current mirror system, characterized by, The current mirror system includes: Reference current module, used to generate reference current; A current mirror module is used to replicate the reference current to generate the output current; A voltage follower module is used to make the voltages at each output terminal of the current mirror module equal; The current mirror module includes a first transistor and a second transistor. The gates of the first transistor and the second transistor are respectively connected to the reference current module. The sources of the first transistor and the second transistor are connected to an external circuit supply voltage. The drains of the first transistor and the second transistor are respectively connected to the voltage follower module; or, The current mirror module includes a fourth transistor and a fifth transistor. The gates of the fourth transistor and the fifth transistor are respectively connected to the reference current module. The sources of the fourth transistor and the fifth transistor are grounded. The drains of the fourth transistor and the fifth transistor are respectively connected to the voltage follower module.
2. The high precision wide voltage range current mirror system of claim 1, wherein: When the current mirror module includes a first transistor and a second transistor, the voltage follower module includes a first operational amplifier and a third transistor. The drain of the first transistor is connected to the inverting input terminal of the first operational amplifier, the source terminal of the third transistor, and the substrate, respectively. The drain of the second transistor is connected to the non-inverting input terminal of the first operational amplifier. The output terminal of the first operational amplifier is connected to the gate terminal of the third transistor. The drain of the third transistor is connected to the reference current module.
3. The high precision wide voltage range current mirror system of claim 2, wherein: The reference current module includes a first resistor and a second operational amplifier. The drain of the third transistor is connected to one end of the first resistor and the non-inverting input of the second operational amplifier, respectively. The other end of the first resistor is grounded. The inverting input of the second operational amplifier is connected to an external reference voltage. The output of the second operational amplifier is connected to the gates of the first transistor and the second transistor, respectively.
4. The high precision wide voltage range current mirror system of claim 2, wherein: The first transistor and the second transistor are both P-type MOS transistors; the third transistor is a depletion-type PMOS transistor.
5. The high precision wide voltage range current mirror system of claim 1, wherein: When the current mirror module includes a fourth transistor and a fifth transistor, the voltage follower module includes a third operational amplifier and a sixth transistor. The drain of the fourth transistor is connected to the inverting input of the third operational amplifier, the source of the sixth transistor, and the substrate, respectively. The drain of the fifth transistor is connected to the non-inverting input of the third operational amplifier. The output of the third operational amplifier is connected to the gate of the sixth transistor. The drain of the sixth transistor is connected to the reference current module.
6. The high precision wide voltage range current mirror system of claim 5, wherein: The reference current module includes a second resistor and a fourth operational amplifier. The drain of the sixth transistor is connected to one end of the second resistor and the non-inverting input of the fourth operational amplifier, respectively. The other end of the second resistor is connected to an external circuit power supply voltage. The inverting input of the fourth operational amplifier is connected to an external reference voltage. The output of the fourth operational amplifier is connected to the gate of the fourth transistor and the gate of the fifth transistor, respectively.
7. The high precision wide voltage range current mirror system of claim 5, wherein: The fourth transistor and the fifth transistor are both N-type MOS transistors; the sixth transistor is a depletion-type NMOS transistor.