Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Reexamination Certificate
2005-08-02
2008-09-02
Phu, Sanh D (Department: 2618)
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
C455S147000, C455S340000, C455S280000, C455S255000, C375S148000, C375S272000
Reexamination Certificate
active
07421252
ABSTRACT:
A phase rotator for a Cartesian feedback power amplifier in a transmitter final stage contains an integrated voltage controlled tunable resonant circuit accomplishing band-pass filtering at a center frequency selected by local oscillator (LO) coarse trim control signals. The voltage controlled tunable resonant circuit attenuates input signal harmonic levels at large fractional bandwidths for the downconverter in the feedback LO path without setting a large number of poles in the band-pass filter. The binary-weighted course trim value for controlling the gain of the LO sets a bank of voltage-variable capacitors (VVC) in the voltage controlled tunable resonant circuit to control the center frequency in each of two 2-pole band-pass filters, creating a composite 4-pole band-pass filter at the input of a poly-phase quadrature generation circuit in the feedback LO path.
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Kirschenmann Mark A.
Wong Derek K.
Dillon & Yudell LLP
Freescale Semiconductor Inc.
Phu Sanh D
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