Microwave-Carrier Modulation-Demodulation Amplifiers and Logic Circuits

Modulation-demodulation (M-D) amplifiers are four-terminal unidirectional amplifiers in which amplitude modulators with conversion gain are followed by demodulators. This paper describes wideband video M-D amplifiers (voltage-gain-bandwidth product = 1.5 Gc), low-noise RF M-D amplifiers (signal frequency = 1.2 Gc, voltage-gain-bandwidth product = 70 Mc, noise figure < 3 db), and ultra-high-speed M-D logic circuits (possible pulse repetition rates of the order of 109 per second). The wideband video M-D amplifier is analyzed and satisfactory agreement between theory and experiment is obtained.