Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1979-10-11
1982-03-09
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329166, 329204, 455337, H03D 118
Patent
active
043191959
ABSTRACT:
A demodulator for demodulating an amplitude modulated signal of a carrier signal. The demodulator provides a high output and is suitable for use in integrated circuitry. An input signal is connected to the base of one transistor of a pair of transistors forming an input differential amplifier. The input differential amplifier is stably biased by means of a constant current generator, diodes, input resistors and collector resistors. The two opposite phase output voltages from the differential amplifier are applied to the bases of a pair of transistors which have their collectors and emitters tied together. The output from the latter transistor pair is taken from the common emitter connection and it is applied directly to the base of an emitter follower transistor, the output from the latter constituting an output from the demodulator circuitry. The particular circuit arrangement provides significant elimination of the carrier frequency and provides filtering by parasitic capacitances of the transistors.
REFERENCES:
patent: 3965435 (1976-06-01), Kriedt et al.
Grimm Siegfried H.
Nippon Electric Co. Ltd.
Westin Edward P.
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