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The paper presents a continuous comparison comparator as an IP block. The comparator is developed in a standard semiconductor manufacturing process of 180 nm and can be applied in the design of system-on-a-chip devices, a dual-slope ADC in particular. This ADC can be used in the design of multimeters, digital thermometers, and other devices. The comparator is modeled in Cadence software. The result...
Radio communication channels for the transmission of discrete messages are typically affected by various types of additive and multiplicative interferences resulting in non-stationary radio lines. The quality of such radio line changes over time and this requires constant adaptation of receiving and transmission apparatus to the conditions of communication. To implement the modes of adaptation, continuous...
Most modern wireless transceiver complexes require the use of linear power amplifiers having a high efficiency of power supply use. The amplitude characteristic distortion increases the level of intermodulation products, reducing the receiving range and polluting the signal spectrum. The use of the cartesian loop reduces the power amplifier non-linearity without causing a significant increase of the...
Layout design principles of IP blocks in the IC, and frequency mixers in particular, are discussed. Several variants of the layout design are carried out. They are modeled and compared to a schematic implementation. Qualitative assessment of implementations is carried out. The conclusions and the ways of improvement are proposed. The nature and the origin of deviations and variations in the process...
Design of high-speed analog-to-digital converters, high-frequency active filters and other analog signal processing systems with high demands to heir constituent units parameters, requires operational amplifiers with high dc-gain and high unity gain frequency. In developing operational amplifiers with unity gain frequency of several gigahertz and phase margin of more than 600 in the CMOS process,...
The paper presents reference frequency formation system implementation for modern data conversion systems in manufacturing process of 180 nm. The system is based on integer PLL, with VCO being tunable widely. The clock generator forms of nonoverlapping pulses used in ADC. A possibility of loop bandwidth filter program tuning permits usage of a broad frequency comparison range of a detector.
This article discusses regularity between the temperature fluctuation of environment, in which operates the transmitting device, and a random frequency shift of a carrier. Shows how frequency stability over temperature of reference oscillators of transmitting devices influences the probability of packet loss as a result of collisions in asynchronous radio system without feedback. The analytical expressions...
In the article the realization of the new circuit of differential VCO without varactors in 250 nm CMOS technology has been described. The tuning of VCO is realized as a circuit changing load of oscillator. The control curve for differential VCO without varactors is presented. The results of comparing of phase noise for circuits differential oscillators based on N-channel and P-channel transistors...
There are obtained results of investigations of the FHSS on the probability of collisions in an asynchronous radio system without feedback with frequency instability of the carrier commensurate with the band of signal. It is shown that FHSS is inappropriate for reduce the probability of collisions with frequency instability of the carrier commensurate with the width of spectrum signal for normalized...
The article describes the main disadvantages of the commonly used Pierce oscillator circuit. The results of the developing integrated differential crystal voltage controlled oscillator (VCO) for the reference frequency sources are represented. The optimization of the circuit is carried out in terms of phase noise, by applying p-MOS transistors in the circuit. The problem of adjustment the integrated...
In paper results of imitation and natural modeling of process of temperature compensation with use of the microprocessor realizing fuzzy-logic algorithms are adduced. It is shown that usage of designated above principles allows improving essentially temperature stability of oscillator's frequency in difficult service conditions. The considerable attention is given to algorithms of adjustment, training...
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