Pulse width modulator for AM-RF transmitter

Details Pulse width modulator for AM-RF transmitter Pulse width modulator for AM-RF transmitter

1986-02-25

1990-01-23

Safourek, Benedict V.

Telecommunications

Transmitter

Amplitude modulation

330 10, 332109, 375 22, H03F 338

Patent

active

048963720

ABSTRACT:
An RF-AM transmitter of the type including a power pulse amplifier driving an RF amplifier with a modulating voltage via a low pass filter includes a pulse width modulator for deriving variable frequency pulses having a frequency that is a direct function of an RMS like function of the amplitude and frequency of an information source; the width of the pulses is determined by the instantaneous amplitude of the information signal source. The pulse width modulator includes a constant amplitude, variable frequency triangular wave voltage controlled oscillator responsive to a DC signal representing the frequency and amplitude of the information source. In response to amplitude crossovers between the variable frequency triangular wave and the information source, transitions in the pulse width modulated wave are derived.

REFERENCES:
patent: 3413570 (1968-11-01), Brueue et al.
patent: 3506920 (1970-04-01), Swanson
patent: 3588744 (1971-06-01), Swanson
patent: 3835419 (1974-09-01), Milne et al.
patent: 4186346 (1980-01-01), Wysocki
patent: 4319359 (1982-03-01), Wolf
patent: 4524335 (1985-06-01), Yokoyama
Telecommunications and Radio Engineering, vol. 32, pp. 144-147, 1979.

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