Patent ID: 6188970
Filing Date: 2001-02-13
Classification: H03J

Abstract:
A method of calibrating, to a selected receiving frequency, a multistage selective amplifier including an oscillator circuit that outputs a selectively variable oscillator output frequency dependent on and responsive to a variable oscillator input voltage, at least one tuning circuit that is tunable to a selectively variable tuning circuit frequency dependent on and responsive to a variable tuning voltage, and a memory, wherein said method comprises:a) for each one of said at least one tuning circuit, determining a respective mathematical equation defining a relationship between said oscillator input voltage and said tuning voltage as a function of frequency, and storing equation data characterizing said respective mathematical equation in said memory;b) generating said oscillator input voltage with a proper oscillator voltage value dependent on said selected receiving frequency, and applying said oscillator input voltage to said oscillator circuit, such that said oscillator output frequency corresponds to or is frequency shifted from said selected receiving frequency;c) for each one of said at least one tuning circuit, calling up said equation data from said memory, and generating said tuning voltage with a proper tuning voltage value by modifying said oscillator input voltage in accordance with said equation data characterizing said mathematical equation, and applying said tuning voltage with said proper tuning voltage value respectively to said at least one tuning circuit, such that said tuning circuit frequency at least includes said selected receiving frequency.