This uses a dual-gate MIGFET (Multiple-Independent-Gate Field-Effect Transistor, a.k.a multi-gate version of the MOSFET), with the two MOSFETs on the far left simulating a MIGFET, as an AM modulator, where the top gate controls the gain of the MIGFET and the bottom gate being fed with the carrier. After that, the signal goes to a common drain MOSFET amplifier to step down the voltage a bit, which then feeds into a common source MOSFET to amplify the signal, and then a high-pass RC filter to remove any low frequency components, which then goes to two common source MOSFETs to provide a push-pull output, and then that goes to a high-pass RC filter to filter out the DC component, and then that goes to a low-pass LC filter to filter out any harmonics, which finally goes to the antenna.
