RECEIVER AND ITS TRACKING ADJUSTING METHOD

摘要

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 DAC (4) generates a voltage according to the value of data (Do) inputted from an MPU (81) by using a control voltage outputted from a low−pass filter (35) in a local oscillator (3) as a reference voltage used during digital−analog conversion. A multiplier circuit (5) analog−multiplies the output voltage of the DAC (4) by a predetermined multiplier. The output voltage of the multiplier circuit (5) is applied as a tuning voltage to a high−frequency tuning circuit (20). In an EEPROM (84) stored is the value of the input data (Do) of the DAC (4) which 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 MPU (81) reads the data (Do) from the EEPROM (84) and inputs it to the DAC (4).