Low Power Bandgap Reference Using Chopper Amplifier

Kotabagi, Sujata; Hanakanahalli, Chetan; Santra, Abirmoya

doi:10.1007/978-981-16-0275-7_9

Cited by 2 publications

(2 citation statements)

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“…The output resistance of the operational amplifier is the parallel combination of NMOS and PMOS source-follower resistances, resulting in a high output resistance. This ensures that non-dominant poles are far away and do not fall within the gain-bandwidth (GBW) range of the operational amplifier [6][7][8]. The gain of the operational amplifier is:…”

Section: Low-power Operational Amplifier Circuit Design With Chopping...mentioning

confidence: 99%

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A low power and low noise bandgap reference design

Yang,

Yan,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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The bandgap reference circuit is widely used in analog, digital, and various other circuits. However, achieving low noise and power consumption presents challenges. Process variations can cause fluctuations in output voltage. This paper employs resistance trim to correct process-related errors, ensuring precise output voltage. VBE linearization compensation minimizes temperature drift. Simulation results show temperature drift below 10 ppm/°C within -45°C to 125°C. For the operational amplifier, a folded cascode current mirror and chopper structure achieve high gain and low power consumption, which eliminates low-frequency noise. The amplifier draws around 7 uA at 1.8 V, with a gain of about 84 dB, a Gain-Bandwidth Product of 229 kHz, and an output voltage noise of 257.04 nV/√Hz at 10 Hz. The entire circuit operates at 1.8 V, consuming 20.26 uA, with an output voltage noise of 5.38 uV/√Hz at 10 Hz.

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Section: Low-power Operational Amplifier Circuit Design With Chopping...mentioning

confidence: 99%

“…Moreover, the phase margin meets operational requirements. Therefore, the operational amplifier operates stably within the entire bandgap reference circuit [7][8].…”

Section: Circuit Simulation Of Operational Amplifiermentioning

confidence: 99%