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In this paper a voltage mode third order quadrature oscillator is proposed. The proposed filter is suitable for MOS-C implementation making oscillation frequency electronically tunable. The non-ideality analysis of the circuit is also given and for high frequency applications self compensation can be used. PSPICE simulations have been included to demonstrate the workability of the proposed quadrature...
This paper describes the design of a current-mode multiphase sinusoidal oscillator (MSO) based on log-domain all-pass network. The first order all-pass filter circuit is realized by first order all-pass filter. In each block of all-pass filter includes ten bipolar transistors and a grounded capacitor. The simulation of three-phase sinusoidal signal generator is carried out by SPICE. The 2.5V power...
This paper presents the concept of the current follower transconductance amplifier (CFTA) with current gain controllable. The newly modified element is a combination of the current follower, the variable gain current mirror, and the balance output transconductance amplifier. The advantage of the proposed element is that the current transfer characteristics (iz/iƒ and ix/iz) can be electronically tuned...
A new strategy for Oscillation-based Built-In Self Test (OBIST) of active analog filters, applicable for either a whole chip or a part of complex analog and mixed-signal systems, is described. In the test mode, a Circuit Under Test (CUT) is transformed to an oscillator, and the oscillation frequency is then compared to a reference frequency. In our approach, the reference frequency is given by the...
This paper describes the design of a multiphase sinusoidal oscillator (MSO) based on log-domain filtering concept. The circuit is a direct realization of a first-order differential equation for obtaining the inverting lossy integrators. Each integrator comprises only a grounded capacitor and four transistors per phase. The proposed MSO can be instantaneously controlled over a very wide frequency range...
A CDTA (Current Differencing Transconductance Amplifier)-based quadrature oscillator circuit is proposed, employing two CDTAs and two capacitors. All capacitors are grounded. No oscillation condition is needed for the proposed oscillator circuit. The output terminals of the oscillator circuit exhibit high output impedance values, high-end features without any need to a buffer circuit for proper drive...
Recent years have seen an increasing number of application specific integrated circuits (ASICs) designated for various biomedical applications. In this paper we presented a CMOS reconfigurable analogue ASIC working on the discrete-time mode for low power biomedical signal filtering. The ASIC we have developed incorporates a switched-capacitor based analogue module, a current source, a voltage source,...
A current-controlled current-mode multiphase sinusoidal oscillator employing translinear current conveyors is presented. The proposed oscillator circuit, which uses only one translinear current conveyor and one grounded capacitor for each phase and can generate arbitrary n signals which are equal in amplitude and equally spaced in phase. The oscillation frequency of each phase is independently tuned...
A typical field programmable analog array consists of configurable analog arrays (CABs), I/O blocks, an interconnection network and memory registers for device programming. For testing purposes, this FPAA partitioning also applies. Taking advantage of the inherent programmability of the FPAAs, BIST (built-in-self-testing) based scheme is used to obtain an error signal representing the difference between...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
In this paper we show and validate a reliable circuit design technique for current mode signal processing down to fempto-amperes. The technique involves specific-current extractors and logarithmic current splitters for obtaining on-chip sub-pA currents. It is based on "source voltage shifting". A special current mirror based on this technique is also introduced for reliably replicating such...
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