Method and apparatus for checking a power supply in a radio receiver
First Claim
1. A method for checking a power supply in a radio receiver, the radio receiver comprising a local oscillator for generating a local oscillating signal which is to be mixed with a radio-frequency signal, the method comprising the steps of:
- a) supplying power to the local oscillator intermittently;
b) detecting a voltage level of the power supply within a predetermined time period after the power is supplied to the local oscillator, the predetermined time period being determined in advance based on a rise time of the local oscillator; and
c) checking the power supply based on the voltage level.
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Accused Products
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.
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Citations
30 Claims
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1. A method for checking a power supply in a radio receiver, the radio receiver comprising a local oscillator for generating a local oscillating signal which is to be mixed with a radio-frequency signal, the method comprising the steps of:
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a) supplying power to the local oscillator intermittently; b) detecting a voltage level of the power supply within a predetermined time period after the power is supplied to the local oscillator, the predetermined time period being determined in advance based on a rise time of the local oscillator; and c) checking the power supply based on the voltage level. - View Dependent Claims (2, 3, 4)
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5. A method for checking a power supply in a radio receiver, the radio receiver comprising:
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a local oscillator for generating a local oscillating signal; a mixer for mixing a radio-frequency signal with the local oscillating signal to generate an intermediate frequency signal; a demodulator for demodulating a baseband signal from the intermediate frequency signal; and a controller for controlling a receiving operation of the radio receiver, the method comprising the steps of; a) supplying power to the local oscillator intermittently; b) detecting a voltage level of the power supply; c) detecting a rise of the local oscillator; d) selecting a single signal from the baseband signal and the power-supply voltage depending on whether the rise of the local oscillator is detected after the power is supplied to the local oscillator; e) transferring the single signal to the controller; f) checking the power supply based on the single signal before the rise of the local oscillator is detected; and g) performing the receiving operation based on the single signal after the rise of the local oscillator is detected. - View Dependent Claims (6, 7, 8, 9, 10)
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11. An apparatus for checking a power supply in a radio receiver, the radio receiver comprising a local oscillator for generating a local oscillating signal which is to be mixed with a radio-frequency signal, the apparatus comprising:
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power supplying means for supplying power to the local oscillator intermittently; first detecting means for detecting a voltage level of the power supply within a predetermined time period after the power is supplied to the local oscillator, the predetermined time period being determined in advance based on a rise time of the local oscillator; and checking means for checking the power supply based on the voltage level. - View Dependent Claims (12, 13, 14)
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15. A radio receiver comprising:
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a local oscillator for generating a local oscillating signal; a mixer for mixing a radio-frequency signal with the local oscillating signal to generate an intermediate frequency signal; a demodulator for demodulating a baseband signal from the intermediate frequency signal; power supplying means for supplying power to the local oscillator intermittently; first detecting means for detecting a voltage level of the power supply; second detecting means for detecting a rise of the local oscillator; first selecting means for selecting a single signal from the baseband signal and the voltage level depending on whether the rise of the local oscillator is detected after the power is supplied to the local oscillator; transferring means for transferring the single signal to the controller; checking means for checking the power supply based on the single signal before the rise of the local oscillator is detected; and a controller for performing the receiving operation based on the single signal after the rise of the local oscillator is detected. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A radio receiver comprising:
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a power supply; a first circuit group comprising a local oscillator and a frequency converter which converts a received signal from a radio frequency into an intermediate frequency; a second circuit group comprising a demodulator for demodulating a baseband signal from a received signal of the intermediate frequency; a third circuit group comprising a controller for checking the power supply; and an interface connecting between the second circuit group and the third circuit group, the second circuit group further comprising; power supplying means for supplying power to the local oscillator intermittently; first detecting means for detecting a voltage level of the power supply; second detecting means for detecting a rise of the local oscillator; first selecting means for selecting a single signal from the baseband signal and the voltage level depending on whether the rise of the local oscillator is detected after the power is supplied to the local oscillator; and an output port for transferring the single signal to the controller of the third circuit group. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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Specification