Low-Noise Chopper-Stabilized Multi-Path Operational Amplifier with Nested Miller Compensation for High-Precision Sensors

Low-Noise Chopper-Stabilized Multi-Path Operational Amplifier with Nested Miller Compensation for High-Precision Sensors

Blog Article

This paper presents a low-noise multi-path operational amplifier for high-precision sensors.A chopper stabilization technique is applied to the amplifier to remove offset and flicker noise.A ripple reduction loop (RRL) is designed to remove the ripple generated in the process of up-modulating the flicker noise and offset.

To cancel the notch in the overall transfer function due to the RRL operation, a multi-path architecture using both a low-frequency path (LFP) and high-frequency path (HFP) is implemented.The low frequency path amplifier Soccer Balls is implemented using the chopper technique and the RRL.In the high-frequency path amplifier, a class-AB output stage is implemented to improve the power efficiency.

The transfer functions of the LFP and HFP induce a first-order frequency response in the system through nested Miller compensation.The low-noise multi-path amplifier was fabricated using a 0.18 µm 1P6M complementary metal-oxide-semiconductor (CMOS) process.

The power consumption of the proposed low-noise operational amplifier is 0.174 mW with a 1.8 V supply and an active area of 1.

18 mm2.The proposed low-noise amplifier has a unit gain bandwidth (UGBW) of 3.16 MHz, an input referred noise of 11.

8 nV/√Hz, and Cosmetic Bag a noise efficiency factor (NEF) of 4.46.