| 摘要 |
A voltage controlled oscillator based on the Colpitt's design is provided. An inductor (Lc) is provided in parallel to one (Cs) of a pair of series connected capacitors (Cs, Cd). The present of the inductor (Lc) modifies the impedance ratio of the pair of series connected capacitors (Cs, Cd) by introducing a frequency dependence. This frequency dependence mitigates frequency dependent losses in a tuned circuit (Lr, Ct) in the voltage controlled oscillator. The invention provides an enhanced output signal over the frequency range of operation of the voltage controlled oscillator. The invention also improves the modulation of the voltage controlled oscillator's output signal which can be achieved by a separate modulation circuit (Cm, Rm, Vm).
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