Two-way radio having a PLL

Details Two-way radio having a PLL Two-way radio having a PLL

1988-02-10

1990-11-06

Olms, Douglas W.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455216, 455192, 455266, 455260, H04B 140

Patent

active

049692100

ABSTRACT:
A method and arrangement for electronically bandswitching a radio (100) is described which includes at least a receiver (110, 111), a PLL (120), and a fully synchronized, programmable counter as a frequency divider (140) that is coupled between the receiver and the PLL. This fully synchronized divider (140) provides an output signal (143) at a lower frequency with minimal harmonic energy and improves the sideband noise performance as the divisor increases. When the radio also includes a transmitter (104), stepped attenuators (128, 132) are also included for adjusting the modulation of the PLL (120) when in the transmit mode.
The PLL includes at least a reference signal generator (121, 122), a phase detector (124), and a voltage controlled oscillator (127) having an output (129) coupled, via a feedback path, to a second input (131) of the phase detector (124). The fully synchronized, programmable frequency divider includes at least a counter, a data loader, a half-period detector, and a synchronizer which are configured and arranged to provide an output signal (143) having a duty cycle, nearly equal to 50%, which is independent of a divisor and which simplifies the filtering requirements thereafter, thereby providing electronic bandswitching for the radio while exhibiting fast-locking and low-noise characteristics.

REFERENCES:
patent: 4061973 (1977-12-01), Reimers et al.
patent: 4353038 (1982-10-01), Rose et al.
patent: 4395776 (1983-07-01), Naito et al.
patent: 4450583 (1984-05-01), Strobel et al.
patent: 4505800 (1976-05-01), Plouviez
patent: 4528522 (1985-07-01), Matsuura
patent: 4633511 (1986-12-01), Koga et al.
patent: 4654859 (1987-03-01), Kung et al.

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