Circuits for reducing intermodulation noise

Details Circuits for reducing intermodulation noise Circuits for reducing intermodulation noise

1979-01-09

1980-08-12

Mullins, James B.

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

330149, 330151, H03F 126, H03F 368

Patent

active

042175542

ABSTRACT:
Apparatus for reducing the intermodulation noise generated in a chain of amplifiers. The apparatus includes a first phase-shift circuit for at least partially compensating for the phase distortion and phase jumps in the chain and a balancing circuit including a source of compensating noise.
The compensating noise is inverted, then added to the original signal to cancel the distortion generated in the chain. In one embodiment, the source of the compensating noise is a series of amplifiers and phase-shift networks which simulate the transmission characteristics of the actual amplifier chain.

REFERENCES:
patent: 3202928 (1965-08-01), Prior
patent: 3732502 (1973-05-01), Seidel
patent: 3825843 (1974-07-01), Felsberg et al.
patent: 4131859 (1978-12-01), Valle
Kogan et al., "Transit Apparatus for Tertiary Groups with Amplitude Correction (STTG) and with Amplitude and Phase Correction (STTG-FK)," Telecommunications and Radio Engineering, vol. 28-29, No. 9, Sep. 1974, pp. 11-13.

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