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A new structure of the active RC low-pass filter (LPF) is proposed. This scheme is recommended as a second-order link in more complicated antialiasing filters and spectrum limiters in the input circuits of analog-to-digital converters. It is shown that in the low-pass filter under consideration an independent trimming of the main characteristics, such as a pole frequency, a pole attenuation, and a...
A switched capacitor low-pass filter employing folded-cascode CMOS OP Amps with a dynamic switching bias circuit capable of processing video signals, which enables low power consumption, and operation in wide band-widths and low power supply voltages, is proposed. In this filter, charge transfer operations through two-phase clock pulses during the on-state period of the OP Amps and a non-charge transfer...
A novel continuous-time notch filter based on current steering technique was described in this paper. The second-order notch filter consisted of two integrators, one unity-gain inverter and two alpha blocks that were fully integrated onto a silicon chip. The circuit was implemented in SMIC mixed-signal 0.18nm 1P6M process with the die area of 0.06 mm2. Post-annotated simulation indicated the continuous-time...
This paper presents a technique to realize the floating inductor. The circuit implementation is based on the use of operational transconductance amplifier (OTAs) as an active element and a grounded capacitor. The floating inductor requires 3-OTAs. The resulting inductance can be electronically adjusted by varying external bias current accordingly. The simulation has been carried out on Tanner EDA...
A reconfigurable analog system is presented that implements pipelined ADCs, switched-capacitor filters, and programmable gain amplifiers. Each block employs a zero-crossing based circuit for easy reconfigurability and power efficiency. Configured as a 10-bit ADC, the chip consumes 1.92mW at 50MSPS with ENOB of 8.02b and FOM of 150fJ/conversion-step. A third order Butterworth filter is also demonstrated...
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...
In this paper a universal current mode OTA-C biquad with single input and minimum components is presented. The circuit uses only two multiple output OTAs and two capacitors and as such is a canonic design. The circuit realizes all the responses i.e. low-pass, high-pass, bandpass, band-stop and all-pass.
In this work, a low noise low power neural signal amplifier is presented. This amplifier consists of a first-order high pass filter and an OTA. We study the effect of using n-type MOSFET and p-type MOSFET in input stage of OTA, on its overall noise. Then two circuit schematic for overall amplifier is suggested. Finally, the simulation results of suggested amplifier are presented. The gain of amplifier...
The design of a low-cutoff-frequency Gm-C low-pass filter is presented, the key part in the filter, the operational transconductance amplifier utilize a folded-cascode structure. As the circuit is desired to operate at low frequency, it is necessary to design a small linear trans-conductance amplifier employing a cross-coupled input stage. To compensate the gain loss, the auxiliary amplifiers are...
This paper presents a simple technique to realize floating inductance simulators using commercial and low-cost devices. Both negative and positive floating inductances can be obtained in the same scheme without stability problem. The realization method based on the use of operational transconductance amplifiers (OTAs) and one grounded capacitor provides the advantage of an electronic tuning capability...
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 voltage-mode versatile multifunction filter with four inputs and three outputs biquadratic filter based on simple CMOS operational transconductance amplifiers (OTAs) is presented. By appropriately connecting the input and output terminals, the proposed circuit can work as either a single-input multiple-output (SIMO) or a multiple-input single-output (MISO) filter without changing the circuit topology...
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