| 摘要 |
A stabilised voltage controlled oscillator circuit comprises a closed loop circuit containing a voltage controlled oscillator (~), a local oscillator (~) and a harmonic mixer (~) that mixes a stabilised local oscillator (~) frequency signal and a radio frequency (~) signal from the voltage controlled oscillator (~) to obtain an intermediate. frequency (~) signal. An IF amplifier (~) is connected to a linear frequency discriminator (44) that provides an output signal to a summing amplifier (~), which is connected to the voltage controlled oscillator (~). The closed loop circuit uses the linear frequency discriminator (~) to provide a feedback signal that stabilises the voltage controlled oscillator (~).
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