Abstract
One configuration for realizing voltage-mode multifunction filters and another configuration for realizing current-mode multifunction filters using current feedback amplifiers (CFAs) are presented. The proposed voltage-mode circuit exhibit simultaneously lowpass and bandpass filters. The proposed current-mode circuit exhibit simultaneously lowpass, bandpass and highpass filters. The proposed circuits offer the following features: no requirements for component matching conditions; low active and passive sensitivities; employing only grounded capacitors and the ability to obtain multifunction filters from the same circuit configuration.
Highlights
The current feedback amplifier (CFA) can provide constant bandwidth independent of closed-loop gain and high slew-rate capability
Only one filter function can be obtained in each realization
Critical component matching conditions are not required in the design of all proposed circuits
Summary
The current feedback amplifier (CFA) can provide constant bandwidth independent of closed-loop gain and high slew-rate capability. In 1992 [7], Fabre proposed a voltage-mode bandpass and highpass filters circuit by using two CFAs, one grounded capacitor, one floating capacitor and three resistors. The voltage-mode biquad exhibits simultaneously bandpass and highpass filters by using one CFA, one grounded capacitor, one floating capacitor and two resistors. The current-mode biquad exhibits simultaneously bandpass and highpass filters by using one CFA, two grounded capacitors and two resistors. Only one filter function (lowpass, bandpass or highpass) can be obtained in each realization, which implies the need to change the circuit topology to obtain other types of filter functions These single-CFA voltage-mode biquads employ floating capacitors. A new configuration is proposed to realize voltage-mode lowpass and bandpass filters simultaneously by using one CFA, two grounded capacitors and three resistors. Critical component matching conditions are not required in the design of all proposed circuits
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