Simulation Based Analysis of Low-Voltage-Tunable Biquad Filter Using Operational Transconductance Amplifiers

ABSTRACT

A CMOS realisation of a voltage tunable biquad filter using only MOSFET-based operational transconductance amplifier (OTA) and capacitors has been designed using silicon-based CMOS technology. It operates at a low supply voltage of $0.25$ V at a $500$ MHz frequency. The filter is theoretically analysed and then simulated using commercially available Cadence Virtuoso tools at $0.18$ $\mathit{\mu m}$ CMOS technology parameters. The proposed design is used to implement second-order low pass, highpass, bandpass, and bandreject filters with the same circuit simply by tuning the input voltage. The bandwidth and cut-off frequency also can be changed by changing the capacitor values.

KEYWORDS:

• Biquad filter
• low voltage
• Operational Transconductance Amplifier (OTA)

Acknowledgments

Authors are thankful to National Institute of Technology Patna for providing the computational resources.

Disclosure statement

No potential conflict of interest was reported by the author(s).