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As we all know, operational amplifiers has been widely used in oscillator which has the low frequency (less than 100kHz). However, we also can use it for the high frequency ones as long as we have an op-amp with the proper bandwidth. LT1190 and LT1191 can implement excellent gain stages. The following is the schematic [...]

Crystal Colpitts oscillator can be implemented using a transistor and a parallel mode crystal. Here is the schematic diagram of  the circuit: In this circuit, the crystal acts as an inductance. A large value capacitive divider is used between gate, source, and ground, and a small series capacitor is placed in the crystal circuit. You [...]