Abstract
New circuit configurations for realizing bandpass and iowpass current-mode second-order filters are proposed. Each configuration uses a single first-generation current conveyor, a transconductance amplifier, three grounded capacitors, and two resistors at most. The parametersω0andω0/Q0of the bandpass and lowpass realizations are not interdependent and, therefore, single element control of the bandpass and lowpass characteristics is possible. Also, the feasibility of realizing a single element current-controlled sinusoidal oscillator is considered.
Highlights
In the recent past, a number of current-mode bandpass filter and lowpass filter realizations has been presented. 1-5) None of these realizations, meet simultaneously the following attractive features for integration: 1. use of grounded capacitors and 2. independent control of the parameters w0 and w0/Q0
While the circuit proposed by Liu et al 12) enjoys independent control of the parameters w0 and co0/Q0, it uses two capacitors, at least one of them is floating
Assuming ideal CCI and OTA with gm(V + V-),Ix Iy Iz, Vx Vy routine analysis shows that the transfer function I0/I can be expressed as
Summary
A number of current-mode bandpass filter and lowpass filter realizations has been presented. 1-5) None of these realizations, meet simultaneously the following attractive features for integration: 1. use of grounded capacitors and 2. independent control of the parameters w0 and w0/Q0. The circuit proposed by Alami et al ’/ is, the preferred formulation as it uses two grounded capacitors and its parameters w and w0/Q0 are independent. It requires thre[6] current conveyors to take out the output current exhibiting bandpass operation. It requires two floating resistors and it can not realize a lowpass filter. The first can realize a current-mode bandpass filter using two grounded capacitors and one floating resistor and the second can realize a lowpass filter using three grounded capacitors and two resistors, one of them grounded. The feasibility of obtaining a single-element-controlled sinusoidal oscillator will be considered
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