TDMA mobile unit frequency synthesizer having power saving mode

Details TDMA mobile unit frequency synthesizer having power saving mode TDMA mobile unit frequency synthesizer having power saving mode

1995-01-24

1996-07-30

Marcelo, Melvin

Multiplex communications

Wide area network

Packet switching

3701001, 375376, 455343, 331 25, H04B 140, H03L 718

Patent

active

055419291

ABSTRACT:
During transmit and receive slots of a TDMA frame, a reference pulse source (31) is made inactive for power savings purposes, and during an idle slot of the frame it is rendered active to supply pulses to a phase alignment circuit (32) where initial phase alignment is established between an output of a frequency divider (37) and the reference pulse. Phase-aligned signals are supplied to a phase comparator (33), the output of which is coupled to a switched filter bank (35) during the idle slot to cause a selected loop filter to develop a voltage according to the output of the phase comparator (33) to drive a voltage controlled oscillator (36) to generate a local carrier for allowing a channel switching to be effected for a possible hand-off. The connection between the phase comparator (33) and the filter bank (35) is cut off during the transmit and receive slots to maintain that voltage for a closed-loop operation during the next idle slot.

REFERENCES:
patent: 4631496 (1986-12-01), Borras et al.
patent: 4714899 (1987-12-01), Kurtzman et al.
patent: 4743864 (1988-05-01), Nakagawa
patent: 4754235 (1988-06-01), Fujiwara
patent: 4893094 (1990-01-01), Henold et al.
patent: 4988955 (1991-01-01), Horie
patent: 5126693 (1992-06-01), Gulliver et al.
patent: 5140698 (1992-08-01), Toko
patent: 5146187 (1992-09-01), Vandegraaf
patent: 5180992 (1993-01-01), Akiyama et al.

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