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无线手机及CATV基顶盒的VCO设计
李娟
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Voltage Controlled Oscillators (VCOs) have come to the
forefront of RF designs together with the first PLL circuits.
In the era before the PLL, oscillators were mostly free
running and only in rare cases were varactors used for
modulation or temperature compensation. Nowadays, we
rarely see free running oscillators, instead they have
become varactor controlled oscillators. This is because
most RF applications require band coverage, which can
be realized through the PLL circuit requiring two sources
of RF power. The reference source frequency is often a
VCXO or TCXO, while the other frequency is controlled
by the PLL phase detector.
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