Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1996-09-23
1999-02-09
Le, Thanh Cong
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
455318, 455324, H04B 116
Patent
active
058706704
ABSTRACT:
An integrated image reject mixer (150) generates precise quadrature components using highly matched local-oscillator (LO) path and intermediate frequency (IF) path resistor-capacitor (RC) phase shifting networks (131, 138). Because the LO signal from a local oscillator (127) has a constant amplitude, a phase detector (136) feedback loop easily maintains an accurate ninety-degree phase difference between the quadrature LO signals (122, 124) from the LO path phase shifting network (131). Because the two phase shifting networks are matched, the feedback control signal (137) from the phase detector (136) can also be used to maintain an accurate ninety-degree phase difference between the quadrature IF signals (123, 128) from the IF path phase shifting network (138) despite the dynamically-varying amplitude of the IF signal. Thus, this image reject mixer uses only components that may be easily integrated into an integrated circuit.
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Ripley David Steven
Waldie William T.
Chen Sylvia
Cong Le Thanh
Motorola Inc.
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