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High-PSRR low-power single supply OTA

High-PSRR low-power single supply OTA

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A CMOS single supply operational transconductance amplifier (OTA) is reported. It has high power supply rejection capabilities over the entire gain bandwidth. The OTA is fabricated using the AMI 0.5 µm CMOS process. Measurements show power supply rejection ratio (PSRR) of 120 dB to 10 kHz. At 10 MHz, PSRR is 40 dB. The high performance PSRR is achieved using a high impedance current source and two noise reduction techniques. The OTA offers very low current consumption of 25 µA from a 3.3 V supply. It is suitable for applications such as low drop out voltage regulators.

Inspec keywords: CMOS analogue integrated circuits; operational amplifiers

Other keywords: frequency 10 MHz; size 0.5 mum; current 25 muA; CMOS single supply operational transconductance amplifier; voltage 3.3 V; noise reduction techniques; noise figure 120 dB; high impedance current source; low-power single supply OTA; power supply rejection capabilities; power supply rejection ratio; low drop out voltage regulators

Subjects: CMOS integrated circuits; Amplifiers

References

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