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Efficient and smart techniques for analog data acquisition and processing may play crucial role in the design of miniature wearable devices, meant to continuously record, process and wirelessly transmit vital physiological parameters for real time health monitoring. In this work we propose a low-power, all-analog processing unit for an MPG (magneto-plethysmograph) based wearable device, which is meant...
This paper presents a widely tunable balanced-to-unbalanced (balun) bandpass filter (BPF). The proposed balun uses two 2-port N-path BPFs with embedded quadrature phase shifting to achieve the single-ended to differential conversion. Analytical expressions for the in-band (IB) differential to single-ended (DS) and single-ended to differential (SD) voltage gains are derived and validated. A prototype...
This paper presents a new configuration of mixed mode biquadratic filter composed by four second generation current conveyor circuits (CCII), two grounded capacitors and five grounded resistors. This filter is characterized by single input and three output terminals for each mode. It can provides all the three standard filter functions, namely low-pass, band-pass and high-pass, without changing the...
In this paper, using Lab VIEW graphical programming environment are made a number of virtual instruments which are used at the demo/study of low power active filters with operational amplifiers (op-amp). There are analyzed the active first order low pass, high pass and band pass filters. The results are included in two papers. The first one contains the simulation of active filters. The different...
In consumer electronic video products, one of the most important problems is to build filters in LSI system. The authors have presented an LC simulation synthesis of balanced-type active RC filters using NIC-based gyrators [1]. Since the proposed method have required only npn transistors with better frequency characteristics than those of pnp transistors, excellent frequency responses can have been...
An 8-channel chopper-stabilized analog front-end amplifier (AFEA) is designed in 65-nm CMOS for continuous EEG signal acquisition. The AFEA is composed of eight capacitively coupled chopper instrumentation amplifiers (CCCIAs) with chopper-stabilized circuits and band-pass filters, a multiplexed transconductor, and a transimpedance amplifier. The CCCIA employs an inverter-based folded-cascode amplifier...
This paper describes the design of multifunction second order voltage-mode filter using the voltage differencing differential difference amplifier (VDDDA) as active element. The internal construction of VDDDA based on the 0.25um TSMC CMOS technology is used for simulation and testing. The proposed filter is sort of three inputs-single output (TISO) multifunction filter. It consists of single VDDDA,...
In this paper, a new realization of a fully-differential (F-D) first-order all-pass filter (APF) operating in current mode (CM) is presented. In the proposed F-D CM APF a single adjustable current amplifier (ACA) and two current followers (CFs) with non-unity gain are used as active building blocks. Considering the input intrinsic resistance of CFs as useful active filter parameter, the proposed filter...
We present an analog neural recording front-end design that can be easily interfaced with Address-Event Representation (AER) neuromorphic systems via an asynchronous digital communication channel. The proposed circuits include a low-noise amplifier for biological signals, a delta-modulator analog-to-digital converter, and a low-power bandpass filter. The bio-amplifier has a gain of 54 dB, with an...
This paper presents a new realization of transadmittance mode universal filter having three inputs and single output. The circuit employs two current differencing transconductance amplifier (CDTA), two capacitors and two resistors. One of the CDTA has multiple outputs hence, called MOCDTA. The configuration can realizes low pass (LP), high pass (HP), band pass (BP), and notch filter using CMOS based...
A compact 1st-order analog allpass filter operating from a 1.5 V DC supply is presented. The proposed circuit is formed by a handful of subthreshold pMOS transistors, two capacitors and one current source. Verified by circuit simulations using RF Spectre and the AMS 0.35-micron CMOS parameters, the proposed filter consumes 300 nW quiescent power and contributes output noise voltage of 0.03 mVrms while...
A single input and three outputs voltage-mode multifunction biquadratic filter using a single plus-type differential voltage current conveyor, two capacitors and three resistors is presented. The proposed circuit offers the following features: realization of three filter functions, which are, lowpass, bandpass, and highpass filters, simultaneously, the use of only single plus-type differential voltage...
This paper presents a new current-mode first-order allpass network. The network employs only one current follower transconductance amplifier, one capacitor and two resistors. Unlike previously works, the proposed network offers both non-inverting and inverting allpass transfer functions into one circuit. Moreover, the current gain of the network can be adjusted. The output terminal of the filter possesses...
In this paper, a voltage-mode universal biquadratic filter with high input impedance is presented. The proposed circuit has three input terminals and uses three differential voltage current conveyors (DVCCs), two grounded capacitors and two resistors. It can realize all the standard filter functions that are highpass, bandpass, lowpass, notch, and allpass filters by the adjustments of input voltage...
This paper presents a new three inputs and one output current-mode universal filter employing one modified current differencing transconductance amplifier (MCDTA) and two grounded capacitors. The filter can realize low-pass, bandpass, high-pass, band-stop and all-pass responses by appropriately connecting the input terminals. For realize filtering functions, without component-matching conditions and...
This paper presents a new electronically tunable sinusoidal oscillator. The proposed oscillator is consisted of two second-generation current conveyors with variable current gain, two grounded capacitors, one grounded resistor and one floating resistor. Unlike previously oscillators, the condition and the frequency of oscillation of this oscillator can be controlled electronically and independently...
This paper presents a switchable single/double-band, low noise amplifier (LNA) for WLAN and WiMax systems. The LNA uses wideband bandpass filters and a capacitor of reduced high frequency signals at input matching networks. At the inter stage, using a series resonator increases gain at high frequency. To obtain a small chip size, this study used two center tapped inductors and a switch. This study...
A design methodology and equations are described for lumped-element filter prototypes having low-pass, high-pass, bandpass, or bandstop characteristics with theoretically perfect input- and output-match at all frequencies. Such filters are a useful building block in a wide variety of systems in which the highly reactive out-of-band termination presented by a conventional filter is undesirable. The...
A new current-controlled current-mode universal filter with three inputs and single output employing two translinear current conveyor and two grounded capacitors is presented. The proposed circuit provides low-pass, band-pass, high-pass, bandstop and all-pass current responses from the same configuration at a high impedance terminal. The filter also offers independent electronic control of the natural...
A 4th order Chebyshev complex filter with stop band zeros at the DC point for low-IF receivers' applications using 0.18μm CMOS technology is proposed in this paper. Based on capacitor-OTA integrators, the designed ladder filter uses resistors instead of capacitors to realize the transmission zeros. The complex filter has a 0 to 48dB tunable gain (6dB per step) and over 65dB DC-offset rejection. A...
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