AM transmitter with an offset voltage to the RF stage to compens

Details AM transmitter with an offset voltage to the RF stage to compens AM transmitter with an offset voltage to the RF stage to compens

1977-12-09

1978-10-24

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325144, 325182, 332 41, H03C 102

Patent

active

041224159

ABSTRACT:
An AM transmitter of the type including apparatus for generating a subcarrier signal, pulse width modulating this subcarrier with audio, amplifying this resulting pulse width signal using active devices operating in the more efficient switching mode is disclosed. The amplified pulse width signal is passed through a low pass filter wherein the audio is recovered and used to amplitude modulate a radio frequency stage. The improvement herein includes a means for providing an offset voltage to the RF stage so that the system will develop zero carrier output when the pulse width of the modulating signal to the active devices has a relatively small finite value.

REFERENCES:
patent: 1655543 (1928-01-01), Heising
patent: 3413570 (1968-11-01), Bruene et al.
patent: 3506920 (1970-04-01), Swanson
patent: 3943446 (1976-03-01), Quidort
patent: 4063199 (1977-12-01), Oursler, Jr.

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