Universal Transadmittance Filter Using OTAs and Its Sinusoidal Oscillator Application
Garima Varshney and Richa Srivastava
In present work, a universal operational transconductance amplifier (OTA) based transadmittance mode (TAM) first order is presented. It provided high-paass (HP), low-pass (LP) and all-pass (AP) filter functions based on input excitation. It uses two OTAs and only one grounded energy storing element. Further, the filter parameter possesses electronic tunability through bias current of OTA. SPICE simulations are used. The input and output impedance of the proposed TAM filter are high, a property which is used to transform the circuit to a sinusoidal oscillator by using an additional energy storing element. The operation of the proposal is investigated using SPICE simulations and 180 nm CMOS technology parameters.
Keywords: Universal filter, OTA, transadmittance mode filter, APF as oscillator, Monte-Carlo