Receiver and its tracking adjusting method

Details Receiver and its tracking adjusting method Receiver and its tracking adjusting method

2006-10-10

2006-10-10

Anderson, Matthew D. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S173100, C455S178100, C455S182100, C455S191100

Reexamination Certificate

active

07120407

ABSTRACT:
A receiver such that the period required for tracking adjustment, temperature compensation is not needed, and tracking errors due to fluctuation of the power supply voltage are prevented from increasing, and a tracking adjusting method for the receiver. A DAC4generates a voltage according to the value of data (Do) inputted from an MPU81by using a control voltage outputted from a low-pass filter35in a local oscillator3as a reference voltage used during digital-analog conversion. A multiplier circuit5analog-multiplies the output voltage of the DAC4by a predetermined multiplier. The output voltage of the multiplier circuit5is applied as a tuning voltage to a high-frequency tuning circuit20. In an EEPROM84stored is the value of the input data (Do) of the DAC4which has been measured in advance and corresponds to the tuned voltage of when the tracking error is the minimum at the central value of the local oscillation frequency, and the MPU81reads the data (Do) from the EEPROM84and inputs it to the DAC4.

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