Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Reexamination Certificate
2006-01-10
2006-01-10
Tsang, Fan (Department: 2645)
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
C327S105000, C327S106000, C375S316000, C375S340000, C455S165100, C455S183100, C455S260000, C455S318000, C455S552100
Reexamination Certificate
active
06985701
ABSTRACT:
There is disclosed a frequency synthesizer having an HF synthesizer for generating a first reference frequency signal having a variable frequency in a high-frequency band as a unit synthesizer, an LF synthesizer for generating a second reference frequency signal in a low-frequency band as another unit synthesizer, and an arithmetic circuit including a mixer for receiving the first and second reference frequency signals, a divider for receiving the second reference frequency signal, a mixer for receiving the first reference frequency signal and an output signal from the divider, a divider for receiving an output signal from the mixer, a divider for receiving an output signal from the mixer and capable of switching a division ratio, and a switch for switching and outputting output signals from the dividers, wherein an output signal of the switch is outputted as a first local signal, and an output signal from the divider is outputted as a second local signal.
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Simon Atkinson, et al., “A Novel Approach to Direct Conversion RF Receivers for TDMA Applications”, MWE '99 Microwave Workshop Digest, Dec. 1999, pp. 53-57.
Umeda Toshiyuki
Yoshida Hiroshi
Hashem Lisa
Kabushiki Kaisha Toshiba
Tsang Fan
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