Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1986-12-15
1988-02-09
LaRoche, Eugene R.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332370, 358 40, H03C 100
Patent
active
047244054
ABSTRACT:
The invention relates to a modulator comprising a first differential amplifier (6) which receives an input signal and a correction signal for adjusting the quiescent currents on the first and second output. The first differential amplifier (6) is coupled to a second differential amplifier (19) and a third differential amplifier (22), which receive the carrier signal and which supply the modulated signal. A difference signal proportional to the difference between the current of the first output and the current of the second output of the first differential amplifier (40) is applied to a low-pass filter (25), whose output signal is applied to a control amplifier (40). The control amplifier (40) supplies the correction signal to the second input of the first differential amplifier (6) via a storage device (50).
REFERENCES:
patent: 4338580 (1982-07-01), Gay
Bierkarre Gert F. H.
Matthies Karl-Heinz
LaRoche Eugene R.
Mayer Robert T.
Pascal Robert J.
U.S. Philips Corporation
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