Triangle/Square Waveform Generator Using Area Efficient Hysteresis Comparator
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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.
Document typePeer reviewed
Document versionFinal PDF
SourceRadioengineering. 2016 vol. 25, č. 2, s. 332-337. ISSN 1210-2512
- 2016/2