Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2008-04-22
2008-04-22
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
C375S219000, C375S220000, C375S221000, C375S222000, C331S004000, C331S010000, C331S011000, C331S012000, C331S014000, C455S302000, C455S073000, C455S078000, C455S083000, C455S304000
Reexamination Certificate
active
10673905
ABSTRACT:
A receiver circuit includes an oscillator circuit configured to generate a calibration tone and a phase locked loop (PLL) reference signal. An output frequency of the VCO may be divided by respective amounts to derive a desired calibration tone frequency and a desired PLL reference signal frequency. In addition to the oscillator circuit, the receiver circuit may further include a phase locked circuit configured to generate a PLL output signal that is phase locked in relation to the PLL reference signal. During a calibration mode, a quadrature generator may be used to generate quadrature mixer local oscillator signals dependent upon the PLL output signal, and an in-phase/quadrature mixer may be used to mix the calibration tone with the quadrature mixer LO signals.
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Fan Chieh M.
Lee Siu M
Meyertons Hood Kivlin Kowert & Goetzel P.C.
Silicon Laboratories Inc.
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