Pulse or digital communications – Repeaters – Testing
Patent
1986-10-15
1988-04-05
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 39, 455315, 455324, H03K 902
Patent
active
047363908
ABSTRACT:
There is described a zero IF receiver which affords to reduce offsets normally associated with quadrature mixers employed in such receivers. In order to reduce the effect of such offsets the local oscillator signal is modulated with a balanced pseudo-random phase code signal. This signal is then stripped off by means of additional mixers, one for each of the quadrature channels. The effect of the pseudo-random phase code signal is to spread the spectrum which is associated with the offsets so that the receiver can now respond to desired signals with a minimum of interference.
REFERENCES:
patent: 4063173 (1977-12-01), Nelson et al.
patent: 4491976 (1985-01-01), Saitoh et al.
Lu Ning H.
Ward Charles R.
Griffin Robert L.
Huseman Marianne
ITT Avionics, A Division of ITT Corporation
Twomey Thomas N.
Walsh Robert A.
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