Generation of ASK, FSK and PSK using sample & hold IC LF 398

Amplitude shift keying (ASK), Frequency shift keying (FSK) and Phase Shift keying (PSK) are important digital modulation techniques. To generate these types of modulation various circuits are available. A new simple circuit for generating amplitude shift keying, frequency-shift keying & phase-shift keying waves using sample & hold IC LF 398 is given. Simulation results which confirm the validity of the circuit are also included.