Telecommunications – Transmitter – With feedback of modulated output signal
Reexamination Certificate
2007-08-02
2010-11-23
Nguyen, Lee (Department: 2618)
Telecommunications
Transmitter
With feedback of modulated output signal
C455S127100, C327S113000, C330S250000
Reexamination Certificate
active
07840197
ABSTRACT:
A highly linear and very low-noise down-conversion mixer for extracting weak signals in the presence of very strong unwanted signals is disclosed. Aspects of an embodiment may include a source follower circuit in a transmitter front end of a mobile terminal. The source follower circuit may receive RF signals prior to the RF signals being amplified by a power amplifier for transmission. The RF signals may comprise in-phase and quadrature components. The source follower circuit may generate output RF voltage signals, and communicate the output RF voltage signals to a switching circuit via a coupling capacitor. The switching circuit may down-convert the communicated output RF voltage signals to generate differential baseband signals. The capacitance of the coupling capacitor may be changed to change gain and/or linearity of the differential baseband signals. Each of the differential baseband signals may be low-pass filtered to attenuate higher frequencies.
REFERENCES:
patent: 5327583 (1994-07-01), Yamada et al.
patent: 7672643 (2010-03-01), Loh
patent: 2005/0275429 (2005-12-01), Khan et al.
patent: 2007/0002968 (2007-01-01), Pan
U.S. Appl. No. 11/825,415, filed Jul. 6, 2007, Nullification of Transmitter Noise at Receive Signal Frequency, Ahmad Mirzaei, Hooman Darabi.
Darabi Hooman
Mirzaei Ahmad
Broadcom Corporation
McAndrews Held & Malloy Ltd.
Nguyen Lee
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