Direct frequency modulation apparatus which modulates...

Details Direct frequency modulation apparatus which modulates... Direct frequency modulation apparatus which modulates...

2006-02-28

2006-02-28

Mis, David (Department: 2817)

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

C331S017000, C331S03600C, C331S17700V, C332S127000

Reexamination Certificate

active

07005936

ABSTRACT:
A direct frequency modulation apparatus modulates frequency by applying a transmission data-dependent voltage to the control terminal of a voltage-controlled oscillator without the mediacy of a phased-locked loop. The direct frequency modulation apparatus is set such that the temperature dependencies of a terminal voltage in PLL locking and a modulation voltage in an open state correspond to that of a varicap diode.

REFERENCES:
patent: 6674333 (2004-01-01), Peckham et al.
Aruna Ajjikuttira, et al., “A Fully-Integrated CMOS RFIC for Bluetooth Application”, 2001 IEEE International Solid-State Circuits Conference Digest, Feb. 2001, pp. 198-199.
Masaru Kokubo, et al., “A 2.4GHz RF Transceiver with Digital Channel-Selection Filter for Bluetooth”, 2002 IEEE International Solid State Circuit Conference Digest, Feb. 2002, 3 pgs.

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