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A new CMOS digitally controlled negative-transconductance amplifier (DTA) and an application example of a 4-Bits-Digitally Controlled Oscillator (DCO) are presented in this paper. The DTA is based on the traditional Digital CMOS inverter topology. From simulation and under 1.2 volts supply voltage, the proposed DCO oscillates from 375MHz to 475MHz which is compatible with the Medical Implant Communication...
Quadrature oscillators are effective in applications such as clock-recovery circuits and complex signal processing. In this paper, the oscillation frequency of the CMOS inverter-type N-stage ring oscillator with wired-OR connections is analyzed. The analysis is applied to a quadrature oscillator proposed in 2008, called the ORIGAMI oscillator, and the extended N-stage ring oscillators. To verify the...
In this paper, we propose an all-digital process variability and aging monitor which utilizes a simple buffer ring with a pulse counter. The proposed circuit monitors the process variability according to a count number of a single pulse which propagates on the buffer ring and a fixed logic level after the pulse vanishes. Using the proposed circuit in combination with a simple ring oscillator which...
This paper presents an analytical modeling of ballistic and quasi-ballistic transport, implemented in Verilog-A environment and used for circuit simulation. Our model is based on the Lundstrompsilas approach and uses an expression of the backscattering coefficient given by the flux method. The model takes also into account short channel effects and tales into account the effects of different scattering...
A novel sinusoidal VCO using six digital CMOS inverters is presented in this paper. Simulation with BSIM3V3 parameters of a typical CMOS 0.35 mum process indicates oscillations from 1.28 GHz to 1.46 GHz. Using two additional capacitances about 300 fF, the corresponding frequency range is 491 MHz-562 MHz. The equivalent total power consumption in both cases is lower than llmW. For 1.4 GHz oscillation,...
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