ABSTRACT
Frequency filters are linear electric circuits that are used in wide area of electronics. They are also the basic building blocks in analogue signal processing. In the last decade, a huge number of active building blocks for analogue signal processing were introduced. However, there is still the need to develop new active elements that offer new possibilities and better parameters. The current, voltage or mixed-mode analog circuits and their various aspects are discussed in the Paper. This work reflects the trend of low-power (LP) low-voltage (LV) circuits for portable electronic and mobile communication systems and the problems of their design. The need for high performance LV circuits encourages the analog designers to look for new circuit Architectures and new LV techniques. This paper presents a high-performance current differencing transconductance Amplifier (CDTA), a recently reported active element, especially suitable for analog signal processing applications. A high linearity CMOS configuration for a CDTA is made up of high linearity input and output stages. It is a resistor less circuit, so it is beneficial to IC implementation in terms of space consideration. The circuit is a second order single input multiple output (SIMO) current-mode filter. This filter can simultaneously realize all basic filter functions high pass, low pass and band pass Responses without any component-matching conditions. All the active and passive sensitivities are low presents a voltage-mode universal filter using a CDTA. It has two inputs and one output. The circuit can simultaneously realize low-pass, band pass, and high pass, band reject and all pass filter functions without changing the circuit topology and passive elements. A voltage-mode Oscillator using CDTA is presented, in which Oscillator has high input impedance and employs four active elements, two grounded capacitors and there is no resistor. Based on the generalized description of the structure various solutions are presented and compared. Universal filter, Adder, Integrator, Second order butterworth filter these circuits are designed in Tanner tool and all results are verified with the help of T Spices imulation results are Included to verify and demonstrate the feasibility of the Oscillator. All the simulation Results using a TSMC 0.35-μm CMOS process model were included to verify the Expected values.
