FULLY PROGRAMMABLE UNIVERSAL FILTER WITH INDEPENDENT GAIN-ω₀-Q CONTROL BASED ON NEW DIGITALLY PROGRAMMABLE CMOS CCII

Abstract

A fully programmable second-order universal filter with independently controllable characteristics is presented in this paper. The proposed filter is based on a new ± 0.75 V second-generation current conveyor with digitally programmable current gain. The input stage of the current conveyor is realized using two complementary MOS differential pairs to ensure rail-to-rail operation. The output stage consists of a Class-AB CMOS push-pull network, which guarantees high current driving capability with a 47.2 µA standby current. The digital programmability of the current conveyor, based on transistor arrays and MOS switches, provides variable current gain using a digital code-word. Two approaches for implementing current conveyors with programmable current gain either greater or less than one are described. The fully programmable universal filter and the proposed digitally programmable current conveyor circuits are simulated using PSPICE with 0.25 µm CMOS technology from MOSIS.

Reconfigurable Voltage Mode Phase Shifter using Low Voltage Digitally Controlled CMOS CCII

“…The cu rrent su mming net wo rk (CSN) is included at port-X [1][2][3][4], [9], [10]. The transfer matrix can be exp ressed as follows.…”

“…Introduction of digital control to the current conveyor (CCII) has boosted its functional flexib ility and versatility in addit ion to its higher signal bandwidth, greater linearity and large signal bandwidth [1][2][3][4][5][6][7][8][9][10]. This dig ital control has eased the on chip control of continuous time systems through digital word with h igh resolution capability and reconfigurability [1][2][3][4][5], [10].…”

“…This dig ital control has eased the on chip control of continuous time systems through digital word with h igh resolution capability and reconfigurability [1][2][3][4][5], [10].…”

DVCC-Based Non-linear Feedback Neural Circuit for Solving System of Linear Equations

“…Therefore, we next describe the proposed digitally controlled DVCC with only Z + outputs. The technique is to control the current transfer gain parameter k of the DVCC by replacing the Z terminal transistors of the DVCC with transistor arrays associated with switches [4]. The gain parameter k can take values from 1 to (2 n − 1), where n represents the number of transistor arrays.…”

Fully Digitally Programmable Generalized Mixed Mode Universal Filter Configuration

“…This is attributed to its higher signal bandwidth, simpler circuitry and lower power consumption [11]. Introduction of digital control/programming in the second-generation CC (CCII) has further enhanced its functional flexibilities and versatility [7,10,12,17,26,29].…”