Method and apparatus for checking a power supply in a radio rece

Details Method and apparatus for checking a power supply in a radio rece Method and apparatus for checking a power supply in a radio rece

1995-07-25

1998-03-03

Vo, Nguyen

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

455 383, 455 677, 455343, H04B 1700

Patent

active

057246513

ABSTRACT:
In a radio receiver comprising a battery, a local oscillator, a mixer, a demodulator and a controller, a voltage level of the battery is detected within the rise time of the local oscillator after the power is supplied thereto. The power is intermittently supplied to the local oscillator and other circuits. Before the rise of the local oscillator, the voltage level is selected to check the battery. After the rise of the local oscillator, the demodulated signal is selected to perform usual receiving operation. The rise of the local oscillator is detected by comparing an amplitude of the intermediate frequency signal with a reference value. The voltage level and the demodulated signal are transferred to the controller through a single port.

REFERENCES:
patent: 5095308 (1992-03-01), Hewitt
patent: 5473319 (1995-12-01), Asai
patent: 5530911 (1996-06-01), Lerner et al.

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