High fidelity triangle Wave generator consumes only 6 µA:  10/16/03 EDN Design Ideas  /  (added 1/05)  Ideal triangle waves involve infinite d2V/dt2, so high-fidelity triangle waves entail very high bandwidths. Micropower circuits have fairly low bandwidth, so generating good triangle waves with such circuitry becomes problematic. The circuits of Figure 1 show two methods of generating triangle waves....

LB-23: Linear Brief 23 Precise Tri-Wave Generation:  National Semiconductor - Application Note   (added 2/06)

Precise Tri-Wave Generation:  National Semiconductor - Application Note   (added 2/06)

Transconductance amp gives Oscillator reciprocal response:  04/17/03 EDN Design Ideas  /  (added 1/05)  The circuit in Figure 1 is a variation on the familiar integrator/comparator triangle-wave oscillator, which you typically implement with two op amps. An integrator and a comparator connect in a positive-feedback loop; the comparator drives the integrator and vice versa. A fixed amount of hysteresis exists in the comparator, producing a triangle wave at the integrator's output....

Triangle Wave Oscillator:  (Electronic circuit added 7/03)

Tri-Waveform Generator:  (Electronic circuit added 4/05)