In order to improve the efficiency(usable RF to total pulse) of a klystron modulator, a system using a solidstate compensation circuit has been developed. This system remarkably improves a flat-top and flatness of the output waveform of the modulator by means of waveform synthesis. This paper presents the design and specifications of the compensation circuit and the results of a preliminary tes...

A low power, wideband wireless transmitter utilizing ∆Σ direct digital modulation of an RF carrier is presented. The transmitter architecture replaces high dynamic range analog circuits with high speed digital circuits and a passive LC bandpass filter, saving power and area compared to conventional IQ modulators for wideband systems. A prototype transmitter IC built in 0.13 μm CMOS demonstrates...

These experiments explored the effect of relative modulator phase on the detection of a three-component modulator applied to a 4,000-Hz sinusoidal carrier with a level of 70 dB SPL. The central modulator component had a frequency of 50 Hz, and the two other components had frequencies of 50+/-5, 10, 25, 40, or 45 Hz. Thus, the modulator waveform was always periodic. Each modulator component had ...