Frequency doubling circuit with integrated differential amplifier - having inputs supplied with identical voltage levels, but one fed with initial frequency to be doubled

摘要

The differential amplification (VI) has two push-pull inputs and push-pull outputs. The imputs (4, 5) are supplied with identifical voltage levels (U1, 2), with the frequency (f) to be doubled fed to one imput E or 4). The two push-pull outputs (3, 2) are directly inter-connected. A double frequency (sf) appears at an output (A). Pref. a series-connected, identical, second differential amplifier (V2) is operated as a Schmitt trigger. A reference voltage (Uref) is applied to its one input. The key ratio of the oscillation at the second amplifier outputs (7, 6) can be determined by the doubled frequency. wi USE/ADVANTAGE - Integrated amplifiers, gnwth simple circuit desig.