Triangle wave oscillator normally designed with a constant current source/sink to charge and discharge a capacitor. Reading an article on how to get 10 bit reading precision on 8 bit ADC on electronic design magazine today, I got something interesting on how to build a triangle wave oscillator: using two XOR-ed square wave oscillator. The picture below describe the concept:

Using this method, you can get a triangle wave oscillator with few logic gates plus some capacitors and resistors for square wave oscillators and simple RC-filters.

Source: Electronic Design Magazine

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