Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2006-11-21
2006-11-21
Urban, Edward F. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S334000, C455S324000, C455S207000, C455S313000, C327S113000, C327S116000
Reexamination Certificate
active
07139546
ABSTRACT:
A direct conversion circuit that not only down-converts the received modulated signal using a down-converting mixer into a baseband signal, but also, after performing a passive low pass filtering to remove higher-order components, performs up-conversion of the baseband signal using an up-converting mixer. Active elements such as highly sensitive amplifiers do not operate on the baseband signal itself, but on the up-converted version of that baseband signal, thereby reducing the 1/f noise introduced by those active elements. The downstream circuitry after the up-conversion may be coupled by intervening capacitors since the downstream circuitry is operating on a higher frequency signal. Accordingly, the DC offset introduced by the downstream active elements is reduced.
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Petrov Andrei R.
Rice Jeremy J.
AMI Semiconductor Inc.
Chow Charles
Urban Edward F.
Workman Nydegger
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