Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2007-02-13
2007-02-13
Nguyen, Tony T. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S150100, C455S280000, C455S341000, C331S143000, C331S176000, C333S167000, C327S552000
Reexamination Certificate
active
10901966
ABSTRACT:
A frequency generator which can perform stable frequency oscillation unaffected by temperature variation.A frequency generator having a differential amplifier (1) having an LC resonance circuit (10) as a load and buffer circuits (21, 22) feeding back an output of the differential amplifier to its input, wherein a temperature coefficient converter (5) converting an output voltage of a reference voltage generator (4) and its temperature dependence to a voltage having a predetermined voltage and temperature coefficient and outputting it is provided to control bias currents IEF of emitter follower circuits to be in proportion to temperature variation. There are a characteristic in which delay time of the emitter follower circuits constructing the buffer circuits is in inverse proportion to a transconductance of transistors and a characteristic in which the transconductance is in inverse proportion to temperature and is in proportion to the bias currents IEF. An oscillation frequency stable to temperature variation can be obtained.
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Masuda Toru
Nakamura Takahiro
Ohhata Kenichi
Antonelli, Terry Stout and Kraus, LLP.
Renesas Technology Corp.
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