초록 ▼

A voltage controlled oscillator comprises more than one dissimilar diode. The dissimilar diodes have different capacitance versus voltage characteristic shapes. The dissimilarity causes the tuning gain factor of the resulting oscillator to be an increasing function of increasing frequency. Such an o

A voltage controlled oscillator comprises more than one dissimilar diode. The dissimilar diodes have different capacitance versus voltage characteristic shapes. The dissimilarity causes the tuning gain factor of the resulting oscillator to be an increasing function of increasing frequency. Such an oscillator when properly incorporated into a phase lock loop can yield loop parameters which are a constant function of increasing frequency.

대표청구항 ▼

A voltage controlled oscillator for generating a variable frequency signal, wherein the frequency of said variable frequency signal is a function of a frequency control voltage, said function having a gain factor defined as change in frequency over change in volts, comprising: a biased amplifier hav

A voltage controlled oscillator for generating a variable frequency signal, wherein the frequency of said variable frequency signal is a function of a frequency control voltage, said function having a gain factor defined as change in frequency over change in volts, comprising: a biased amplifier having an output terminal for providing said variable frequency signal; and a variable reactance resonant tank for setting the frequency of said variable frequency signal over a predefined range of resonant frequencies, said variable reactance having a positive reactance component and first and second varactor diodes having different capacitance versus voltage characteristics from each other, said first and second varactor diodes receiving said frequency control voltage; wherein said capacitance versus voltage characteristic of said first varactor diode is selected such that said gain factor increases over a first subset of said predefined range of resonant frequencies and wherein said capacitance versus voltage characteristic of said second varactor diode is selected such that said gain factor increases over a second subset of said predefined range of resonant frequencies different from said first subset, thereby causing said gain factor to increase with the frequency of said variable frequency signal over said predefined range of resonant frequencies.