A c c e p t e d M a n u s c r i p t 1 A novel ±0.8V high performance voltage-tunable CDTA with enhanced bandwidthIn this paper, we proposed a novel high performance CMOS CDTA with the G M can be linearly tuned by a voltage. By using high-speed low voltage cascaded current mirror active resistance compensation technique, the proposed CDTA circuit exhibits wide frequency bandwidths, high current tracking precisions as well as large output impedances. The linear-tunable G M of CDTA is designed with use of linear composite MOSFETs as basic cells in the circuit. Combining these two approaches, several design concerns are studied: impedance characteristic, tracking errors, offset and linearity, as well as noise. The prototype chip with a 0.25 mm 2 area is fabricated in GlobalFoundries'0.18μm CMOS process. The simulated results and measured results with ±0.8V DC supply voltages are presented, which show extremely wide bandwidths and wide linear tuning range. In addition, a fully differential band-pass filter for high-speed system is also given as an example to confirm the high performance of proposed circuit.
This paper presents a new topology for realizing current-mode reconfigurable nth-order filter for multi-mode wireless communication equipments, which is based on a new active device, namely digitally programmable current differencing transconductance amplifier (DPCDTA). The proposed filter is resistorless, and it employs n DPCDTAs and n grounded capacitors with one input and one output terminals. The signal path of the filter does not contain any switches, and wide tuning coefficient of the filter is implemented using programmable current division network with zero standby power consumption in the DPCDTA. Also, the proposed topology exhibits broader programmable features to accommodate wide range of selectivity requirements, which can be used as the most compatible structure for fieldprogrammable analog array and very suitable for multi-mode filtering applications. The programming ability of variable filter orders from first to fourth providing low-pass, highpass, and band-pass responses, and programming ability of variable cutoff frequencies from 1.14 to 11.75 MHz are given as application examples. The performance of the circuits have been verified and evaluated through post-layout simulations using Cadence IC5141 with GlobalFoundries'0.18 μm CMOS process.
In this paper, a signal flow graph structure of current-mode multifunction filter using current differencing transconductance amplifier (CDTA) is presented. The proposed configuration is comprised of two grounded capacitors and four CDTAs. They exhibit low-input and high-output impedances, which is very convenient for integrated circuit implementation. The presented filter configuration can realize all the standard filter functions simultaneously, lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP), without any component matching conditions. The natural frequency () and the bandwidth () of the proposed filter can be electronically tuned by varying the bias current of the CDTA. PSPICE simulation results are included to confirm the theory.
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