Radio with fast lock phase-locked loop

Details Radio with fast lock phase-locked loop Radio with fast lock phase-locked loop

1991-06-05

1992-12-29

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

455260, 375 81, H04B 140, H03L 700

Patent

active

051757290

ABSTRACT:
A communication device (508) for use in a Time Division Multiplex (TDM) communication system (500) includes a transmitter, a receiver, and a frequency scanner for quickly scanning the radio frequency communication channels to determine an available channel. The communication device (508) also includes a phase locked loop (100) for providing a reference signal for the communication device (508) and locking to the available channel. This phase locked loop (100) includes a Voltage Control Oscillator (VCO) (104) having a control signal input (103). The phase locked loop (100) also includes a first filter (110) and a second filter (108). The first filter (110) has a wide frequency response. The second filter (108) includes a storage element (222) and has a narrow frequency response. The phase locked loop (100) also includes a switching circuit (106) which determines which one of the two filters (110, 108) gets coupled to the voltage control oscillator (104).

REFERENCES:
patent: 3993958 (1976-11-01), Cutsogeorge
patent: 4117420 (1978-09-01), DeConinck
patent: 4167711 (1979-09-01), Smoot
patent: 4243941 (1981-01-01), Zdunek
patent: 4330758 (1982-05-01), Swisher et al.
patent: 4559505 (1985-12-01), Suarez et al.
patent: 4703520 (1987-10-01), Rozanski, Jr. et al.
patent: 4866710 (1989-09-01), Schaeffer

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