Triangle/Square Waveform Generator Using Area Efficient Hysteresis Comparator

M. Drinovsky, J. Hospodka

Triangle/Square Waveform Generator Using Area Efficient Hysteresis Comparator

Číslo: 2/2016
Periodikum: Radioengineering Journal
DOI: 10.13164/re.2016.0332

Klíčová slova: Function generator, triangle and square wave generator, hysteresis comparator, Funkční generátor, generátor trojúhelníku a obdélníkových vln, hysterezní komparátor

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Anotace: A function generator generating both square and triangle waveforms is proposed. The generator employs only one low area comparator with accurate hysteresis set by a bias current and a resistor. Oscillation frequency and its non-idealities are analyzed. The function of the proposed circuit is demonstrated on a design of 1 MHz oscillator in STMicroelectronics 180 nm BCD technology. The designed circuit is thoroughly simulated including trimming evaluation. It consumes 4.1 μA at 1.8 V and takes 0.0126 mm2 of silicon area. The temperature variation from -40°C to 125°C is ±1.5 % and the temperature coefficient is 127 ppm/°C.